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Keywords: ct
MO-AB-221AB-1BEST IN PHYSICS (IMAGING): Multiplexed Spectral Computed Tomography (CT) Imaging of Three Contrast Agents
C A S Dunning1*, J O'Connell1 , K Murphy1 , S Robinson1 , K Iniewski2 , M Bazalova-Carter1 , (1) University of Victoria, Victoria, BC (2) Redlen Technologies, Saanichton, BC
MO-AB-221AB-2A KV-MV Cone Beam CT Metal Artifact Reduction Technique Using a Multi-Layer MV Imager and Poly-Energetic Correction
M Jacobson1*, M Lehmann2, P Huber2, M Myronakis1, M Shi4, D Ferguson1, I Lozano1, P Baturin3, T Harris1, R Fueglistaller2, C Williams1, D Morf2, R Berbeco1 (1) Brigham and Women's Hospital, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA (2) Varian Medical Systems, Baden-Dattwil, Switzerland (3) Varian Medical Systems, Palo Alto, CA (4) University of Massachusetts, Lowell, Lowell MA
MO-AB-221AB-3Comparison of a Supervised and An Unsupervised CNN Learning Model for Edge Prediction in Prior Contour Based Total Variation (PCTV) CBCT Reconstruction
Y Chen1*, Z Jiang2 , F Yin3 , L Ren4 , (1) Duke University, Durham, NC, (2) Duke Univeristy, Durham, NC, (3) Duke University Medical Center, Durham, NC, (4) Duke University Medical Center, Cary, NC
MO-AB-221AB-4Improving Low-Dose Cone Beam CT Image Quality Via Convolutional Neural Network
N Yuan1,2, S Rao3 , B Dyer3 , S Benedict3 , Y Kang1 , J Qi2 , Y Rong*3 , (1) Northeastern Univerisity, Shenyang (2) Univerisity of California, Davis, Davis, CA (3) UC Davis Cancer Center, Sacramento, CA
MO-AB-221AB-5Low Dose KV-MV Cone Beam CT with a Multi-Layer MV Imager and Edge-Preserving Sinogram Denoising
M Jacobson1*, M Lehmann2, P Huber2, A Wang3, M Myronakis1, M Shi4, D Ferguson1, I Lozano1, Y Hu1, P Baturin3, T Harris1, R Fueglistaller2, J Star-Lack3, C Williams1, D Morf2, R Berbeco1 (1) Brigham and Women's Hospital, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA (2) Varian Medical Systems, Baden-Dattwil, Switzerland (3) Varian Medical Systems, Palo Alto, CA (4) University of Massachusetts, Lowell, Lowell MA
MO-AB-221AB-6Multi-Energy Element-Resolved Cone Beam CT for Radiotherapy Image Guidance Under Low-Concentration Iodine Contrast Agent
H Jung*, C Shen , Y Gonzalez , M Yang , X Jia , University of Texas Southwestern Medical Center, Dallas, TX
MO-AB-221AB-8ResNet-Based Marker-Free Prostate 6D Auto-Setup in the Cone-Beam CT Guided Radiation Therapy
X Liang1,2*, W Zhao1 , Y Xie2 , L Xing1 , (1) Stanford Univ School of Medicine, Stanford, CA, (2) Shenzhen Institutes of Advanced Technology, Shenzhen, Guangdong
MO-AB-221AB-9Student Beats the Teacher: Deep Learning Using a 3D Convolutional Neural Network (CNN) for Augmentation of CBCT Reconstructed From Under-Sampled Projections
Z Jiang*, F Yin , L Ren , Duke University Medical Center, Durham, NC
MO-AB-221AB-10Experimental Development and Validation of a Rotational Blocker Concept for Under Sample CBCT Reconstruction and Scatter Correction in Radiation Therapy: End to End Confirmation
N Hassan Rezaeian1*, Y Xu2 , B Li1 , C Shen1 , L Zhu3 , X Jia1 , (1) The University of Texas Southwestern Medical Ctr, Dallas, TX, (2) Southern Medical University, Guang Zhou, (3) Georgia Institute of Technology, Atlanta, GA,
MO-AB-221AB-11Accelerated Model-Based Iterative 3D Image Reconstruction Using a Multi-Level Morphological Pyramid
A Sisniega1*, J W Stayman1 , S Capostagno1 , C R Weiss1 , T Ehtiati2 , J H Siewerdsen1 , (1) Johns Hopkins University, Balitmore, MD, (2) Siemens Medical Solutions USA
MO-AB-225BCD-0Joint AAPM-SNMMI Symposium: Nuclear Medicine Theranostics and Functional Image-Guided Radiation Therapy for Precision Oncology
S Bowen1*, S Kappadath2*, J Humm3*, S Bentzen4*, D Pafundi5*, (1) University of Washington, School of Medicine, Seattle, WA, (2) UT MD Anderson Cancer Center, Houston, TX, (3) Memorial Sloan-Kettering Cancer Center, New York, NY, (4) University of Maryland, Baltimore, MD, (5) Mayo Clinic, Rochester, MN
MO-AB-SAN1-9Large Improvements in Plan Quality with a New Commercial Treatment Planning System for a Robotic Treatment Unit
M Gizynska1*, L Rossi1 , W den Toom1 , M Milder1 , K de Vries1 , B Heijmen1 , (1) Erasmus MC, University Medical Center Rotterdam, Department of Radiation Oncology
MO-AB-SAN1-10Small Field Dosimetry: Detector Dependency On Output Factor and Off-Axis-Ratio Measurements for a Novel Radiosurgery System
D Pinnaduwage1*, S Srivastava1 , X Yan1 , S Jani1 , C Jenkins2 , G Weidlich2 , M Bodduluri2 , S Sorensen1 , (1) Barrow Neurological Institute (BNI) St. Joseph's Hospital & Medical Center, Phoenix, AZ, (2) Zap Surgical Systems, Inc., San Carlos, CA
MO-AB-SAN1-11Treatment Planning System and Beam Data Validation for a Novel Self-Shielded Stereotactic Radiosurgery System (SRS)
S Srivastava1*, S Jani1 , D Pinnaduwage1 , X Yan1 , M Bodduluri2 , S Sorensen1 , (1) Barrow Neurological Institute (BNI) St. Joseph's Hospital & Medical Center, Phoenix, AZ, (2) Zap Surgical Systems, Inc., San Carlos, CA
MO-AB-SAN1-12Assessing the Mechanical and Dosimetric Stability of a Novel Self-Shielded Stereotactic Radiosurgery (SRS) Delivery System
S Srivastava1*, D Pinnaduwage1 , S Jani1 , X Yan1 , M Bodduluri2 , S Sorensen1 (1)Barrow Neurological Institute (BNI) St. Joseph's Hospital & Medical Center, Phoenix, AZ,(2) Zap Surgical Systems, Inc., San Carlos, CA
MO-C930-GePD-F3-1Investigation of Effect of Filter On the Total Skin Irradiation Using Monte Carlo Simulation
W Tseng*, R Li , Q Wu , Duke University Medical Center, Durham, NC
MO-C930-GePD-F3-3Electron Backscatter From Internal Lead Shielding for Superficial Facial Electron Treatments
Y Xu1,3*, S Aldelaijan2,3 , I Buzurovic1,3 , M Czerminska1,3 , (1) Harvard Medical School, Boston, MA, (2) McGill University, Canada,(3) Brigham & Women's Hospital, Boston, MA
MO-C930-GePD-F3-4Evaluation of a Modified Pencil Beam Algorithm Dose Calculation in the Presence of Intensity Modulators for Intensity Modulated Bolus Electron Beam Conformal Therapy
E Hilliard1,2*, R Carver2 , K Hogstrom3 , K Erhart4 , (1) Medical University of South Carolina, Charleston, SC, (2) Mary Bird Perkins Cancer Center, Baton Rouge, LA, (3) Mary Bird Perkins Cancer Center, Baton Rouge, LA, (4) .decimal LLC, Sanford, FL
MO-C930-GePD-F3-5Whole Body Surface Cherenkov Distribution Analysis in Total Skin Electron Therapy Using Computer Animation Methods
T Miao1*, H Petroccia2 , Y Xie3 , J Mahoney1 , P Bruza1 , M Jermyn4 , B Pogue1 , D Gladstone5 , T Zhu2, B Williams5 , (1) Dartmouth College, Hanover, NH, (2) University of Pennsylvania, Philadelphia, PA, (3) Massachusetts General Hospital, Boston, MA, (4) DoseOptics LLC, Lebanon, NH, (5) Dartmouth-Hitchcock Med. Ctr., Lebanon, NH
MO-C930-GePD-F4-3Novel Semi-Automatic Reconstruction Method for Plastic Gynaecological Applicators
A Otal1,4*, J Vijande2,4 , F Ballester2,4 , A Forner1 , O Ripol1 , C Monfa1 , S Serrano1 , J Perez-Calatayud3,4 (1) Hospital Universitari Arnau de Vilanova, Lleida (2) University of Valencia, Burjassot (3) Hospital La Fe, Valencia (4) Medical Physics Research Group La Fe-UVEG
MO-C930-GePD-F4-6Feasibility Study of Focal Salvage High Dose Rate (HDR) Brachytherapy After Neurovascular-Sparing Prostate Stereotactic Ablative Radiation Therapy (SAbR)
N Hassan Rezaeian*, B Gannavarapu , R Hannan , M Folkert , A Garant , R Timmerman , B Hrycushko , N Desai , The University of Texas Southwestern Medical Ctr, Indianapolis, IN
MO-C930-GePD-F5-3Improving Differentiation of Tumor and Surrounding Tissues for Tumor Delineation in Pancreas Using Image Textures From Dual-Energy CT
D Schott1*, G Noid1 , P Knechtges1 , W Hall1 , B Erickson1 , T Schmidt2 , X Li1 , (1) Medical College of Wisconsin, Milwaukee, WI, (2) Marquette University, Whitefish Bay, WI
MO-C930-GePD-F8-3Occupational Recorded Badge Doses in U.S. Radiologic Technologists Performing Nuclear Medicine Procedures
D. Villoing1*, S.L. Simon1 , B.H. Alexander2 , M.S. Linet1 , C.M. Kitahara1 (1) Division of Cancer Epidemiology and Genetics, National Cancer Institute, Rockville, MD (2) Division of Environmental Health Sciences, School of Public Health, University of Minesota, Minneapolis
MO-C930-GePD-F8-6Verification of Dose Calibrator Consistency for Tc-99m XSPECT System Calibration in a Large Clinical Nuclear Medicine Department
M Jacobsen*, W Erwin , UT MD Anderson Cancer Center, Houston, TX
MO-C930-GePD-F9-1Effective Dose Associated with Routine CT Examinations of the Abdomen and Pelvis with Iodinated Contrast
P Patel1*, P Mager2 , L Chang3 , N Gupta4 , (1) Houston Methodist, Sugar Land, TX, (2) ,Houston, ,(3) Houston Methodist, Houston, ,(4) ,Houston,
MO-C930-GePD-F9-2Evaluation of Dose Distribution by Categories in X-Ray CT Room Using Monte Carlo Simulation
T Fujibuchi1*, D Ueno2 , (1) Division of Medical Quantum Radiation Sciences, Department of Health Sciences, Faculty of Medical Sciences, Medical, Kyushu University, Fukuoka, ,(2) Radiation technology course, Department of Health Sciences, Kyushu University,Fukuoka,
MO-C930-GePD-F9-4Investigation of a Novel Method to Assess ATCM Performance of CT Scanners
Y Yang*, H Liu , Y Huang , W Zhuo ,
MO-C930-GePD-F9-6Prediction of Volume CT Dose Index for Dose Modulation with Adaptive Statistical Iterative Reconstruction -V (ASIR-V)
Y (Jimmy) Zhou1*, J Nute2 , (1) Cedars-Sinai Medical Center, Los Angeles, CA, (2) UT Health San Antonio, San Antonio, TX
MO-E115-GePD-F2-1Delta Radiomics: Assessment of Tumor Response for Lung SBRT Patients Using Daily CBCT
S Meade1*, G Ge2 , J Molloy3 , D Pokhrel4 , (1) ,Lexington, KY, (2) ,Lexington, KY, (3) Univ Kentucky, Lexington, KY, (4) University of Kentucky, Lexington, KY
MO-E115-GePD-F2-4Prediction of Acute Xerostomia Based On Delta Radiomics From CT Images During Radiation Therapy for Nasopharyngeal Cancer
Yanxia LIU1*, Hongyu SHI1, Sijuan Huang2, Xiaochuan CHEN1, Huimin ZHOU2,3, Hui CHANG2, Yunfei XIA2, Guohua WANG1, Xin Yang2. (1) School of Software Engineering, South China University of Technology, Guangzhou, Guangdong, 510006, China. (2) Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, Guangdong, 510060, China. (3) Department of Oncology, the Seventy-fourth Group Army Hospital of the Chinese People's Liberation Army, Guangzhou, Guangdong, 510318, China.
MO-E115-GePD-F3-3Dose Distribution in the Near Zone of a CO2 Filled Breast Expander for 6MV and 10MV Photon Beams
B Hasson1*, T Li2 , C Geraghty3 , J Carroll4 , M Young4 ,(1) Anne Arundel Medical Center, Annapolis, MD, (2) ,Annapolis, MD, (3) Anne Arundel Medical Center, Annapolis, MD, (4) Versant Medical Physics & Radiation Safety, Tewksbury, MA, (5) Anne Arundel Medical Center, Annapolis, MD,
MO-E115-GePD-F5-3Respiratory Deformation Registration in 4D-CT/CBCT Using Deep Learning
X Teng1*, Y Chen2 , Z Jiang2 , Y Zhao1, L Ren2 , (1) Duke Kunshan University, Kunshan, (2) Duke University, Durham, NC
MO-E115-GePD-F5-5A Classification Algorithm to Reconstruct Voxel-By-Voxel Motion Trajectory From 4D-CT Images Using Displacement-Vector-Fields Calculated by Deformable Image Registration
N Alsbou1*, S Ahmad2, I Ali2 , (1) Department of Engineering and Physics, University of Central Oklahoma, Edmond, OK, (2) University of Oklahoma Health Sciences, Oklahoma City, OK
MO-E115-GePD-F5-6Investigation of the Accuracy of Deformable Image Registrations Between Average-Intensity Images
Y He*, G Cazoulat , M McCulloch , P Balter , Z Liao , R Mohan , K Brock , The University of Texas MD Anderson Cancer Center, Houston, TX
MO-E115-GePD-F7-3An Innovative Artifact Management Method for Proton Therapy Planning (AMPP) of the Head and Neck
D Branco*, P Taylor , S Kry , X Zhang , J Rong , S Frank , D Followill , UT MD Anderson Cancer Center, Houston, TX
MO-E115-GePD-F7-4Characterization of Common Dental Hardware Materials for Head-And-Neck Proton Therapy
Y Hu1*, R Greenland2 , D Mundy1 , (1)Department of Radiation Oncology, Division of Medical Physics, Mayo Clinic, Rochester, MN, (2) Department of Advanced Prosthodontics, Mayo Clinic, Rochester, MN
MO-E115-GePD-F7-5Comparison of Dosimetric Evaluations Using Deformed Planning CT and Deep-Learning Corrected CBCT to Quality Assurance CT for Monitoring Anatomy Changes During Proton Therapy
A Stanforth*, K Langen , L Lin , A Dhabaan , Y Lei , Y Liu , Y Wang , J Sohn , M McDonald , B Eaton , T Liu , X Yang , J Zhou , Emory University, Atlanta, GA
MO-E115-GePD-F8-3Convenient Characterization of Megavoltage Flat Panel Modulation Transfer Function by Measuring the Edge Spread Function with a Thin Tantalum Foil
T Harris1,2*, J Seco3 , J Star-Lack4 , M Shi5 , R Berbeco2 , (1) University of Heidelberg, Heidelberg, Germany, (2) Brigham & Women's Hospital, Boston, MA, (3) DKFZ Heidelberg, FS05, Heidelberg, ,(4) Varex Imaging, Salt Lake City, UT, (5) University of Massachusetts Lowell, Lowell, MA
MO-E115-GePD-F9-1Correction to the Ground Truth Noise From Adjacent Slice Subtractions with the First and Third Generation Adaptive Statistical Iterative Reconstructions
Y (Jimmy) Zhou*, A Scott , Cedars-Sinai Medical Center, Los Angeles, CA
MO-E115-GePD-F9-2Fast Low Contrast Detectability Assessment
A Omigbodun*, S Hsieh , University of California Los Angeles, Los Angeles, California
MO-E115-GePD-F9-3Investigation of Origin and Clinical Impact of Different Artifacts in Thorax CT
E Lavdas1*, M Papaioannou2 , A Tsikrika3 , E Pappas4 , G Sakkas5 , V Roka6 , S Kostopoulos7 , S Stathakis8 , N Papanikolaou9 , P Mavroidis10 , (1) University of West Attica, Athens, ,(2) Animus Kyanoys Stavros, Larissa, ,(3) General University Hospital of Larissa, Larissa, ,(4) Animus Kyanoys Stavros, Larissa, ,(5) University of Thessaly, Trikala, ,(6) Health Center of Farkadona, Trikala, ,(7) University of West Attica, Athens, ,(8) University Of Texas Health, San Antonio, TX, (9) University of Texas HSC SA, San Antonio, TX, (10) Univ North Carolina, Chapel Hill, NC
MO-E115-GePD-F9-4Pitch Dependence of Slice Sensitivity Profile and Dose-Efficiency in CT
S Rose1*, M Lipford1 , F Ranallo1 , (1) University of Wisconsin, Madison, WI,
MO-E115-GePD-F9-5Task-Based Evaluation of a Novel High-Matrix Size Reconstruction Employed to Best Utilize Spatial Resolution in State-Of-The-Art Computed Tomography
T Schuermann1*, J Solomon2 , E Samei3 , J Ramirez-Giraldo1 , (1) Siemens Healthineers, Durham, NC, (2) Duke University, Durham, NC, (3) Duke University Medical Center, Durham, NC, (1) Siemens Healthineers, Durham, North Carolina
MO-G-SAN1-0Contemporary Pediatric Radiation Therapy: Perspectives From Children's Oncology Group
J Breneman1*, P Rassiah-Szegedi2*, M Gopalakrishnan3*, (1) University of Cincinnati, Cincinnati, OH, (2) University Utah, Salt Lake City, UT, (3) Northwestern Memorial Hospital, Chicago, IL
MO-GH-221AB-0Computed Tomography-Guided Interventional Procedures
F Fintelmann1*, A Jones2*, S Leng3*, K Yang1*, (1) Massachusetts General Hospital, Boston, MA, (2) UT MD Anderson Cancer Center, Houston, TX, (3) Mayo Clinic, Rochester, MN
MO-GH-SAN2-4Generalized Local Impulse Response Prediction in Model-Based Material Decomposition of Spectral CT
W Wang*, M Tivnan , G Gang , S Tilley , J Stayman , Johns Hopkins University, Baltimore, MD
MO-GH-SAN2-9Improved Glioblastoma Survival Prediction Using Deep Learning-Based Radiomic Features From Preoperative Multimodal MR Images
J Fu*, K Singhrao , X Zhong , X Qi , Y Yang , D Ruan , J Lewis , UCLA School of Medicine, Los Angeles, CA
MO-I345-GePD-F1-4Validation of Total Skin Irradiation Using Two Monte Carlo Systems
W Tseng1*, R Li2 , Q Wu3 , D Sawkey4 , (1) Duke University Medical Center, Durham, NC, (2) Duke University Medical Center, Durham, NC, (3) Duke University Medical Center, Durham, NC, (4) Varian Medical Systems, Palo Alto, CA
MO-I345-GePD-F2-5VMAT Plan Complexity Feature Analysis for Predicting Quality Assurance Outcomes Using Forests of Extremely Randomized Decision Trees
P Wall1*, J Fontenot1,2 , (1) Louisiana State University, Baton Rouge, LA, (2) Mary Bird Perkins Cancer Center, Baton Rouge, LA
MO-I345-GePD-F4-1Improving Treatment Efficiency Using Photon Optimizer MLC Algorithm for Single-Isocenter/Multiple-Lesions VMAT Lung SBRT
L Sanford*, J Molloy , M Bernard , M Randall , R McGarry , D Pokhrel , University of Kentucky, Lexington, KY
MO-I345-GePD-F4-2Development and Implementation of a Mechanical and Radiation Tests for a Novel Stereotactic Radiosurgery Device Utilizing a 2D Detector Array, to Replace the Film-Based QA
S Becker*, P Sabouri , E Nichols , B Yi , Univ. of Maryland School Of Medicine, Baltimore, MD
MO-I345-GePD-F4-3Noninvasive Cardiac Ablation to Treat Ventricular Tachycardia - Optimized Volumetric Modulated Arc Therapy Technique for Varian Edg and Halcyon Delivery Systems
S Goddu1*, (1) Washington University, St. Louis, MO
MO-I345-GePD-F7-6Improving Pancreas SBRT Treatment Planning with PlanIQ
G Kuzmin1*, M Abazeed1 , M Kolar1 , A Magnelli1 , P Xia1 , S Balik1 , (1) Cleveland Clinic, Cleveland, OH
MO-I345-GePD-F9-1An Apparatus for Measuring Beam Quality in Computed Tomography
N Ruiz Gonzalez*, J Lancaster , G Clarke , UT Health Sciences Center, San Antonio, TX
MO-I345-GePD-F9-3Calcium Score QC Test Tool
D Pfeiffer1*, (1) Boulder Community Health, Boulder, CO
MO-I345-GePD-F9-4CT ACR Contrast-To-Noise Ratio Measurements: How Changes in Image Slice Thickness and Increment Can Improve Diagnostic Quality of Clinical Images But Yield Lower ACR Measurements
J Huggett1 , A Ferrero2 , L Yu2 , C Favazza2*, (1) Gloucestershire Hospitals, Worcester,UK (2) Mayo Clinic, Rochester, MN
MO-I345-GePD-F9-6Predicting Patient Mis-Centering in CT as a Methodology for Monitoring CT Technologist Performance
C Burton*, Harvard University, Boston, MA
MO-J430-CAMPUS-F1-2CT Radiomics Texture Features Indicate Radiation Induced Pneumonitis
T Bejarano*, D Kwon , M De Ornelas , R Yechieli , H Perlow , L Freedman , I Mihaylov , Univ Miami, Miami, FL
MO-J430-CAMPUS-F1-3Effect of Spectral Pre-Filtration On Organ and Effective Dose in CT Colonography
S Lemke1*, D Nachand2 , F Dong2 , A Primak3 , B Herts2 , P Segars4 , X Li2 , (1) Cleveland State University, Cleveland, OH, (2) Imaging Institute, Cleveland Clinic, Cleveland, OH, (3) Siemens Medical Solutions USA, Inc., Cleveland, OH, (4) Duke Univ, Durham, NC
MO-J430-CAMPUS-F1-4Learning-Based Low Dose CT Reconstruction in Radiation Therapy
T Wang , Y Lei , X Dong , Z Tian , Y Liu , X Jiang*, T Liu , W Curran , H Shu , X Yang , Emory Univ, Atlanta, GA
MO-J430-CAMPUS-F2-4Machine Learning Method to Automate Structure Name Mapping
W Sleeman IV1,3*, J Nalluri1,3 , S Khajamoinuddin2 , P Ghosh2 , M Hagan1,3 , J Palta1,3 , R Kapoor1,3 , (1) Virginia Commonwealth University, Department of Radiation Oncology, Richmond, VA (2) Virginia Commonwealth University, Department of Computer Science, Richmond, VA (3) National Radiation Oncology Program, Department of Veteran Affairs, Richmond, VA
MO-J430-CAMPUS-F2-5Intelligent Synthetic CT Generation Based On CBCT Images Via Unsupervised Deep Learning
L Chen*, X Liang , C Shen , S Jiang , J Wang , UT Southwestern Medical Center, Dallas, TX
MO-J430-CAMPUS-F3-4Impact of Cardiac Substructure Dose for Modeling Radiation Toxicity in the Heart
J Niedzielski*, X Wei , T Xu , D Gomez , Z Liao , J Bankson , S Lai , L Court , J Yang , University of Texas-MD Anderson Cancer Center, Houston, TX
MO-K-304-0Clinical Application of Frameless Stereotactic Radiosurgery (SRS)
M Podgorsak1*, R Popple2*, K Sixel3*, J Yang4*, M Podgorsak5*, (1) Roswell Park Cancer Institute, Buffalo, NY, (2) University Alabama Birmingham, Birmingham, AL, (3) R.S. McLaughlin Durham Reg Cancer Ctr, Oshawa, ON, (4) Alliance Imaging/Alliance Oncology, Havertown, PA, (5) Roswell Park Cancer Institute, Buffalo, NY
MO-K-SAN2-1Automatic Detection of Contouring Errors Using Convolutional Neural Networks
D Rhee1*, C Cardenas2 , H Elhalawani3 , R McCarroll4 , L Zhang5 , J Yang6 , B Beadle7 , L Court8 , (1) MD Anderson Cancer Center, Houston, TX, (2) University of Texas MD Anderson Cancer Center, Houston, TX, (3) UT MD Anderson Cancer Center, Houston, TX, (4) University of Maryland Medical Center, Baltimore, MD, (5) MD Anderson Cancer Center, Houston, TX, (6) MD Anderson Cancer Center, Houston, TX, (7) Stanford University, Stanford, CA, (8) UT MD Anderson Cancer Center, Houston, TX
MO-K-SAN2-3Evaluation of Functional Avoidance Treatment Planning Tradeoffs in a Response Based Adaptive Lung Clinical Trial
N Baughan*, D Jarema , R Ten Haken , R Dess , S Jolly , M Matuszak , University of Michigan, Ann Arbor, MI
PO-GePV-E-11Feasibility of a Flipped Lesson Learning Model for the Education of Medical Physics Residents
DN Stanley*, R Popple , R Sullivan , A Dalton , E Covington , The University of Alabama at Birmingham, Birmingham, AL
PO-GePV-E-16The Study of a Novel Photon Beam Model Based On the Elimination of the Geometric Penumbra
Y Shuangyan*, X Yaping
PO-GePV-I-1A Comparison of Patient Setup Error On Different Matching Methods Used in X-Ray Volumetric Imaging During Head and Neck VMAT Delivery
P Mohandass1,2*, D Khanna2 ,B Nishaanth1,T Thiyagaraj1,C Saravanan1, Narendra Bhalla1, Abhishek Puri1, (1) Fortis Hospital, Mohali, ,(2) Department of Physics, School of Science, Arts, Medica and Management, Karunya Institute of Technology and Science, Coimbatore, TN
PO-GePV-I-9Unsupervised Classification Routine to Correlate Nonlinearly Related Multiple Images: An Example for CT/CBCT Lung Images Normalization
A Chu1*, J Kim2 , Z Xu3 , S Ryu4 , W Liu5 , W Tome6 , (1)(2)(3)(4) Stony Brook University, Stony Brook, NY, (5) Yale Univ. School of Medicine, New Haven, CT, (6) Montefiore Medical Center, Bronx, NY
PO-GePV-I-13Augmentation of MRI Multi-Sequence Radiomics Data to Improvebrain Tumor Classification
K Ogden1*, N Salastekar1 , D LaBella1 , A Chakraborty1 , E Oakes2 , R Mangla1 , (1) SUNY Upstate Medical Univ, Syracuse, NY, (2) Syracuse University, Syracuse, NY
PO-GePV-I-16Image Acquisition Technique for Nuclear Medicine Using Deep Profile Learning
M Choi*, D Yoon , M Kim , T Suh , The Catholic University of Korea, College of MedicineSeoul
PO-GePV-I-21Comparison of Image Segmentation Algorithms Based On Threshold Technique and Clustering Technique for CT Scan Images
M Mahdian Manesh , R Faghihi*, Shiraz universityShiraz
PO-GePV-M-6Comparing the Accuracy of Surface Guided Imaging to Orthogonal X-Rays for Stereotactic Radiosurgery
V Bry*, J McCulloch , J Rembish , N Papanikolaou , R Crownover , N Kirby , D Saenz , P Myers , S Stathakis , K Rasmussen , University of Texas HSC SA, San Antonio, TX
PO-GePV-M-10Dosimetric Impact of Forced Densities Over the Course of RT
D Schott1*, S Lim1 , R Thapa1 , D Prah1 , X Li1 , E Paulson1 , (1) Medical College of Wisconsin, Milwaukee, WI
PO-GePV-M-124D IMRT QA: Optimum Ways to Setup Motion Phantom
M Zhang1*, Y Song1 , L Voros1 , X Tang2 , (1) Memorial Sloan Kettering Cancer Center, Bergen, NJ, (2) Memorial Sloan Kettering Cancer Center, West Harrison, NY
PO-GePV-M-26Data Driven Deformable Image Registration for Extreme Deformations
E Castillo1*, D Fuentes2 , (1) Beaumont Health Research Institute, Houston, TX, (2) MD Anderson, Houston, TX
PO-GePV-P-3Radiation Protection Compliance and Disposal of a Micro Multi-Leaf Collimator
R Rodgers1,2*, C Helstern2, M Price1,2, (1) School of Medicine at Vanderbilt University, Nashville, TN, (2) Vanderbilt University Medical Center, Nashville, TN
PO-GePV-P-4Computed Tomography Dose Monitoring Systems, Technical Issues for Developers and Technologists
H Khosravi1*, A Fatemi1 , P Pike2 , (1) University of Mississippi Medical Center, Jackson, MS, (2) Huntsville Hospital, Huntsville, AL
PO-GePV-P-8Importance of Vetting Test Equipment After Purchase, Repair Or Calibration: A Case Study
P Brunick*, J Wang , B Helbig , J Clements , Kaiser Permanente Southern California Permanente Medical Group, Los Angeles, CA
PO-GePV-P-15Part 37 Regulations for Gamma Knife: Factors to Consider with Implementation
J Brindle1*, M Rivard2 , E Klein3 , (1) Rhode Island Hospital / Warren Alpert Medical School, Providence, Rhode Island, (2) Rhode Island Hospital / Brown University, Providence, RI, (3) Rhode Island Hospital / Warren Alpert Medical School, Providence, RI
PO-GePV-P-29Radiotherapy Vault Shielding Adequacy Evaluation When a Halcyon Replaces a Standard Linac-Practical Considerations and Recommendations
D Mihailidis1*, A Dwivedi2 , B Agarwal3 , Kagadis4 (1) University of Pennsylvania, Philadelphia, PA, (2) Steeplechase Cancer Center, Somerville, NJ, (3) Phoebe Putney Memorial Hospital, Albany, GA, (4) University of Patras, Rio, Greece
PO-GePV-P-36Development of a CT Scanner Model for Dose Simulation
Y Huang*, H Liu , Y Yang , W Zhuo ,
PO-GePV-P-37Characterization of a Non-Clinical FLASH Beam
R Sadagopan6*, J Pollard-Larkin1 , R Tailor2 , P Balter3 , M Gillin4 , J Symons5 , (1) MD Anderson Cancer Center, Houston, TX, (2) UT MD Anderson Cancer Center, Houston, TX, (3) UT MD Anderson Cancer Center, Houston, TX, (4) MD Anderson Cancer Ctr., Houston, TX, (5) MD Anderson UTHealth Graduate School, Houston, TX, (6) MD Anderson Cancer Center, Houston, TX
PO-GePV-P-38A Winston-Lutz Test Based High Resolution Quality Assurance Protocol for Auto-Driving Couch System for Stereotactic Radiosurgery
K Li1*, (1)John R Marsh Cancer Center, (2) Associates In Medical Physics, Hagerstown, MD
PO-GePV-P-39Multi-View Analysis On the Amount of Radiation From Chest CT Scan with ATCM
H Liu , Y Huang*, Y Yang , W Zhuo ,
PO-GePV-P-50Medical Errors and Incidents in Radiology Imaging
D Hintenlang1*, X Yang2 , X Jiang3 , K Little4 , J Elee5 , K Hintenlang6 , (1) The Ohio State University, Columbus, OH, (2) The Ohio State University, Columbus, OH, (3) The Ohio State University, Columbus, OH, (4) The Ohio State University, Columbus, OH, (5) LA Dept of Environmental Qual, West Monroe, LA, (6) The Ohio State University, Columbus, OH
PO-GePV-P-52Dosimetric Effects of Embolic Agent Artifacts in Arteriovenous Malformations Stereotactic Radiosurgery Treatment Planning Calculation
M Alshanqity*, A Elawadi , A alamro , Y Bayoumi , H Alhussain , Y Orz , S Alqahtani , S Melheim ,
PO-GePV-P-63Effect of CT Image Reconstruction Parameters On the Precision of Objective Volume
ZY Wang*, CT Wang , J Dong , BX Wen , The First Affiliated Hospital, The Sun Yat-sen UniversityGuangzhou
PO-GePV-P-66Software for Treatment Vault Designing for Therapeutic Accelerators
M Shah1*, (1) NV-Comprehensive CC of Nevada, Henderson, NV
PO-GePV-P-77Quality Assurance Analysis of Elements Multiple Brain Metastases Treatment Technique
X Liu*, J Vinci , R Boone,J Rahimian,Y.Qian Kaiser Permanente, Los Angeles Medical Center, CA
PO-GePV-P-78Using Stacked FCN Networks to Improve the Accuracy of Automatic Delineation of Target Volumes and Organs at Risk
Y Fu*, H Yu , West China HospitalChengdu
PO-GePV-P-85Comparison of Manual Vs. Semi-Automatic CBCT Image Analysis
L Claps*, P Alaei , University of Minnesota, Minneapolis, MN
PO-GePV-P-86Improved Linear Quadratic Biological Model for Stereotactic Body Radiotherapy
C Yue12, J Zhu14* , Y Yin14 , B Li4 , B Yang23* , (1)Department of Radiation Oncology Physics and Technology, Shandong Cancer Hospital affiliated to Shandong University, Jinan 250117, China.(2)Shandong Key Laboratory of Network Environment Intelligent Computing Technology, University of Jinan, Jinan 250022, China.(3)School of Informatics, University of Linyi, Linyi 276000, China.(4)Shandong Medical Imaging and Radiotherapy Engineering Technology Research Center, Jinan 250117, China
PO-GePV-P-87Fast and Furious: Shielding Designs for Eighteen Imaging Suites Using RadShield
M DeLorenzo*, A Goode , University of Virginia Health Systems, Charlottesville, VA
PO-GePV-P-88An Evaluation of the Effectiveness of Surgical Clips for Fiducial Tracking with the CyberKnife in Partial Breast Cancer Surgery
S AHN*, J Kim , S Lee , J Cho , Y Kim , Yonsei Cancer CenterSeoul
PO-GePV-T-26Comparison of Automatic and Manual Catheter Reconstruction Methods for the Lunar Ovoid Channels of the Venezia Applicator
J Hansen*, D Dunkerley , J Miller , J Huang , University of Wisconsin, Madison, WI
PO-GePV-T-33An Elegant Solution to Satisfy TG 142 Recommendations for Annual Electrons Output and Off-Axis Factor Constancy Versus Gantry Angle Variation
E Galhardo*, G Narayanasamy , G Deshazer , S Morrill , University of Arkansas for Medical Sciences, Little Rock, AR
PO-GePV-T-34Dosimetric Evaluation of Electron Beam Doses at Various Interfaces
K Bales1*, R George1 , M Naessig1 , K Fischer1 , N Papanikolaou1 , N Kirby1 , P Myers1 , D Saenz1 , K Rasmussen1 , S Stathakis1 , (1) University of Texas HSC SA, San Antonio, TX
PO-GePV-T-35New Acceptance Criteria for Evaluating Electron Beam Percentage Depth Dose Using OSLD Remote Audits
P Alvarez*, P Taylor , J Lowenstein , A Molineu , S Kry , D Followill , UT MD Anderson Cancer Center, Houston, TX
PO-GePV-T-37Preliminary Study for Improvement of the Stochastic Noise in the Electron Monte Carlo (eMC) Dose Distribution Using Deep Learning
D Shin*, S Kang , K Kim , T Suh , The Catholic University of Korea, College of Medicine, Seoul, Republic of Korea
PO-GePV-T-38The Effects of High-Z Heterogeneities On the Dose Deposition of Energetic Electron Beam Therapy
I Ali1*, N Alsbou2 , S Ahmad1 , (1) University of Oklahoma Health Sciences, Oklahoma City, OK, (2) Department of Engineering and Physics, University of Central Oklahoma, Edmond, OK,
PO-GePV-T-39Feasibility of 3D Printed High-Metal Content Copper Filament for Electron Cutouts
D Dunkerley1*, M Daniels2 ,A Shepard1 , K Schaefer1 , (1) University of Wisconsin-Madison, Madison, WI, (2) The Virtual Foundry, Stoughton, WI
PO-GePV-T-44Physics of Cancer: Measurement and Modelling of Post-Radiotherapy Cell Migration to Assess Metastasis
A Walther*, M Merrick , C Weeder , H Akhter , M Mimlitz , A Ekpenyong , Creighton University, Omaha, NE, USA.
PO-GePV-T-46NTCP Modeling and Dose-Volume Correlations of Patient Reported Dry Eye Syndrome 1 Month After Whole-Brain Radiation Therapy
K Wang*, R Tobillo , R Pappafotis , K Pearlstein , D Moon , N Sheets , M Kasibhatla , A Weiner , C Shen , T Zagar , L Marks , B Chera , S Das , P Mavroidis , Univ North Carolina, Chapel Hill, NC
PO-GePV-T-47Optimization of Irradiation Interval for Fractionated Stereotactic Radiosurgery by An Improved Cellular Automata Model
D Kawahara1*, Lin WU2 , Y Watanabe2 , (1) Hiroshima University, Hiroshima, Japan,(2) University of Minnesota, Minneapolis, MN
PO-GePV-T-50Intra-Target Dose Surrogates and Treatment Histories as Local Control Predictors for Gamma Knife Stereotactic Radiosurgery of Large Meningioma
Y Natsuaki*, BP Ziemer , M Susko , PK Sneed , SE Braunstein , DR Raleigh , L Ma. Dept. of Radiation Oncology, University of California at San Francisco, San Francisco, CA
PO-GePV-T-52Assessment of Lethality Adjusted Nominal Risk From Radiation Therapy Induced Secondary Malignancies: Female Lung Cancer Cases Study
I Kuo1*, Y Wang2 , C French3 , (1) UMass Memorial HealthCare, Worcester, MA, (2) Massachusetts General Hospital, Boston, MA, (3) Department of Physics and Applied Physics, U. of Massachusetts Lowell, Lowell, MA
PO-GePV-T-53Dose Estimation for a PENTEC Late Effects Study
S Hernandez1*, R Weathers1 , A Gupta1 , S Shrestha1 , S Smith1 , C Lee2 , J Bradley3 , M Hall4 , A Jackson5 , L Constine6 , R Howell1 , (1) MD Anderson Cancer Center, Houston, TX, (2) National Cancer Institute, Rockville, MD, (3) University of Florida, Jacksonville, FL(4) Miami Cancer Institute, Miami, FL (5) Memorial Sloan-Kettering Cancer Center, New York, NY, (6) University of Rochester Medical Center, Rochester, NY
PO-GePV-T-55NTCP Modeling and Dose-Volume Correlations of Patient Reported Xerostomia 1 Month After Whole-Brain Radiation Therapy
P Mavroidis1*, K Pearlstein2 , D Moon3 , N Sheets4 , M Kasibhatla5 , C Shen6 , N Papanikolaou7 , T Zagar8 , L Marks9 , B Chera10 , S Das11 , K Wang12 , (1) Univ North Carolina, Chapel Hill, NC, (2) UNC at Chapel Hill, Morrisville, NC, (3) UNC at Chapel Hill, Morrisville, NC, (4) UNC Health Care, Chapel Hill, NC, (5) UNC at Chapel Hill, Morrisville, NC, (6) UNC at Chapel Hill, Morrisville, NC, (7) University of Texas HSC SA, San Antonio, TX, (8) UNC at Chapel Hill, Morrisville, NC, (9) University of North Carolina, Chapel Hill, NC, (10) UNC at Chapel Hill, Morrisville, NC, (11) Univ North Carolina, Chapel Hill, NC, (12) UNC at Chapel Hill, Morrisville, NC
PO-GePV-T-57NTCP Modeling and Dose-Volume Correlations of Patient Reported Xerostomia 12 Months After De-Intensified Chemoradiotherapy for HPV Associated Oropharyngeal Cancer
P Mavroidis1*, D Fried2 , A Kubli3 , J Weng4 , R Amdur5 , W Mendenhall6 , N Sheets7 , S Stathakis8 , R Green9 , L Marks10 , S Das11 , B Chera12 , (1) Univ North Carolina, Chapel Hill, NC, (2) UNC Health Care, Chapel Hill, NC, (3) Thomas Jefferson University Hospital, Philadelphia, PA, (4) Duke University, Durham, NC, (5) University of Florida Hospitals, Gainesville, FL, (6) University of Florida, Gainesville, FL, (7) UNC Health Care, Chapel Hill, NC, (8) University Of Texas Health, San Antonio, TX, (9) UNC at Chapel Hill, Morrisville, NC, (10) University of North Carolina, Chapel Hill, NC, (11) Univ North Carolina, Chapel Hill, NC, (12) UNC at Chapel Hill, Morrisville, NC
PO-GePV-T-58Evaluation of the Clinical Impact of the Difference Between Planned and Delivered Dose in Prostate Cancer Radiotherapy Based On Daily IGRT and Patient-Reported Outcome Scores
J Hammers1*, D Lindsay2 , X Tan3 , J Dooley4 , S Stathakis5 , N Papanikolaou6 , L Marks7 , A Wang8 , R Chen9 , S Das10 , P Mavroidis11 , (1) ,Chapel Hill, NC, (2) UNC at Chapel Hill, Chapel Hill, NC, (3) UNC at Chapel Hill, Chapel Hill, NC, (4) Univ North Carolina, Chapel Hill, NC, (5) University Of Texas Health, San Antonio, TX, (6) University of Texas HSC SA, San Antonio, TX, (7) University of North Carolina, Chapel Hill, NC, (8) University of North Carolina at Chapel Hill, Chapel Hill, NC, (9) UNC Health Care, Chapel Hill, NC, (10) Univ North Carolina, Chapel Hill, NC, (11) Univ North Carolina, Chapel Hill, NC
PO-GePV-T-124Wavelet-Based Signal Processing Approach for Protoacoustic Measurement in Proton Range Verification
J Sohn1*, W Nie2 , X Yang3 , X He4 , J Zhou5 , S Avery6 , T Liu7 , (1) Emory University, Atlanta, GA, (2) University of Nebraska, Omaha, NE, (3) Emory University, Atlanta, GA, (4) Emory University, Lilburn, GA, (5) Emory University, Atlanta, GA, (6) UNIVERSITY OF PENNSYLVANIA, Sicklerville, NJ, (7) Emory University, Atlanta, GA
PO-GePV-T-131A Data Driven Retrospective Analysis of Couch Tolerances On Patients Positioned Using the Elekta Hexapod
R George*, N Kirby , D Saenz , University of Texas Health Science at San Antonio, San Antonio, TX
PO-GePV-T-132Applying TG-218 Methodology to Large Field VMAT QA Using a Gantry-Resolved EPID-Based Technique
P Cardoso1*, Q Wu2 , B Liang3 , R Wei3 , (1) Duke Kunshan University, Kunshan, China, (2) Duke University Medical Center, Durham, NC, (3) Image Processing Center, Beihang University, Beijing, China
PO-GePV-T-136Definition of Interatrial Septum and Interventricular Septum Margin and Internal Organs at Risk Volume (IRVs) Based On ECG-Gated 4DCT
Q Li*, G Gong , Y Yin , Shandong Cancer Hospital Affiliated to Shandong University, Jinan, China
PO-GePV-T-142Using EPID in Vivo Dosimetry to Quantify Treatment Delivery Accuracy in Canine Head and Neck Tumors
J Lambeck1*, S Saad2 , K Hansen3 , M Kent3 , S Dieterich4 , (1) University of California Davis, Sacramento, CA, (2) The William R. Prichard Veterinary Medical Teaching Hospital, School of Veterinary Medicine,UC Davis, Davis, CA, (3) Department of Surgical and Radiological Sciences, UC Davis School of Veterinary Medicine, Davis, CA, (4) UC Davis Medical Center, Sacramento, CA
PO-GePV-T-156Analysisof Dosimetric Verification Results of Stereotactic Body Radiotherapy
X Zhang*, R Yang , J Li , J Li , J Wang , Peking University Third HospitalBeijing
PO-GePV-T-160Comparative Evaluation of Four Commercial Patient-Specific Quality Assurance Devices for Helical Tomotherapy
K Chang1*, J Lee2 , J Choi1 , C Hong1 , D Jung1 , J Kim1 , J Kim1 , M Han1 , H Lee1 , D Kim1 , J Kim1 , K Park1 , J Cho1 , Y Kim1 , (1) Yonsei Cancer Center, Seoul, (2) The Catholic University of Korea Incheon ST,MARY' s Hospital ,Incheon,
PO-GePV-T-166Comparison of Patient-Specific IMRT QA with the Integral Quality Monitor (IQM) and the Electronic Portal Imaging Device (EPID)
M Ghafarian*, M Morales-Paliza , M Price , Vanderbilt University Medical Center, Nashville, TN
PO-GePV-T-167Commissioning of Mobius3D for Linac-Based SRS and Determination of the Dosimetric-Leaf-Gap
R McCarroll*, P Sabouri , N Lamichhane , Y Poirier , B Yi , S Chen , M Guerrero , University of Maryland School of Medicine, Baltimore, MD
PO-GePV-T-196Energy Spectra for 6 and 15 MV Beams Generated by Truebeam Linac
J Liu1*, S Cozza2, J Chang3, J Baker4 , (1) Northwell Health, Lake Success, NY, (2) Hofstra University, Hempstead, NY, (3) Northwell Health, Lake Success, NY, (4) Northwell Health, Lake Success, NY
PO-GePV-T-201Mean Energy of Secondary Radiation in Teletherapy Treatments, Measured with Thermoluminiscent Dosimeters
V Lopez-Guadalupe1 , E Lopez-Pineda1 , A Rodriguez-Laguna2 , M A Poitevin-Chacon2 , M E Brandan1*, (1) Instituto de Fisica UNAM, Mexico City, MX, (2) Hospital Medica Sur, Mexico City, MX
PO-GePV-T-202Characterizing the PTW MicroDiamond Detector in Orthovoltage Radiation
A Khan*, W Culberson , E Simiele , J Hull , L DeWerd , Dept of Med Phys, School of Medicine and Public Health, Univ of Wisc - Madison
PO-GePV-T-219Comparison of Breast V105% Between Pre- and Post-Merged Subfields in Field-In-Field Hypofractioanted Breast Radiation Treatment Plans
A Dwivedi1, T McGarry2 , L Bond3 , J Braver4 , N Biswal5* , (1) Robert Wood Johnson University Hospital Somerset, Steeplechase Cancer Center, Somerville, NJ, (2) Robert Wood Johnson University Hospital Somerset, Steeplechase Cancer Center, Somerville, NJ, (3) Robert Wood Johnson University Hospital Somerset,Steeplechase Cancer Center, Somerville, NJ, (4) Robert Wood Johnson University Hospital Somerset,Steeplechase Cancer Center, Somerville, NJ, (5) Rutgers- Cancer Institute of New Jersey, New Brunswick, NJ
PO-GePV-T-226Assessment of Dosimetric Perturbation Due to Patient Movement During Lung SBRT Using Flattening-Filter Free Beams (FFFB) Or Flattened Beams (FB)
K Xu*, T Biswas , Y Zhang , Y Zheng , T Baig , M Machtay , T Podder , University Hospitals Seidman Cancer Center, Cleveland, OH
PO-GePV-T-294Dosimetric Impact of Alternative Image Guidance Protocols for Radiation Treatment Setup for Head and Neck Cancer Patients: Daily Cone-Beam Computed Tomography (CBCT) Versus Daily 2D KV Imaging
S Lee*, B Zhang , G Lasio , H Xu , A Gopal , S Chen , B Yi , University of Maryland School of Medicine, Baltimore, MD
PO-GePV-T-295Verification of Setup Accuracy with 6 Degree of Freedom Couch and CBCT
T Chen*, H Wang, L Hu, J Zhang, D Barbee, J Xue, NYU Langone Medical Center, New York, NY
PO-GePV-T-309The Efficacy of a Non-Metallic Target for An End-To-End Winston-Lutz Phantom for Use with C-Arm Linear Accelerator Treatment Devices
P Mone*, D Workie , Sinai Hospital of Baltimore, Baltimore, MD
PO-GePV-T-311Gafchromic EBT-XD Film for Dose Profile Evaluation and Absolute Dose Measurement in High Dose Stereotactic Treatments
R Joseph , G Hatzinikolaou , S Kriminski*, Vassar Brothers Medical Center, Poughkeepsie, NY
PO-GePV-T-313Reproducible Beam-Position Hysteresis Observed with Direction of Linac Gantry Rotation
D Pinkham1*, S Kamath1 , S Hancock3 , (1) Yale School of Medicine, New Haven, CT, (2) Southeast Missouri Hospital, Cape Girardeau, MO
PO-GePV-T-314Dosimetric Performance of Two Novel Microchambers for Relative Measurements During Linac Commissioning
T Tekin*, B Poppe , H Looe
PO-GePV-T-319Evaluation of the SRS MapCHECK for CyberKnife Patient-Specific QA
S D Davis1*, A Acha2 , S George3 , W Romaguera4 , L Tirpak5 , V Mishra6 , A Gutierrez7 , (1) Miami Cancer Institute, Miami, FL, (2) Miami Cancer Institute, Miami, FL, (3) Miami Cancer Institute, Miami, FL, (4) Miami Cancer Institute, Miami, FL,(5) Sun Nuclear Corporation, Melbourne, FL, (6) Miami Cancer Institute, Miami, FL, (7) Miami Cancer Institute, Miami, FL
PO-GePV-T-322Resolution and Accuracy of BB Detection in Commercial and In-House Winston-Lutz Analysis Algorithms
M Malin1*, J Partouche2 , T Qu1 , (1) NYU Langone Medical Center, New York, NY, (2) University of Chicago, Chicago, IL
PO-GePV-T-323Applications of Deep Learning in Patient-Specific QA of MLC-Equipped Robotic SBRT and SRS
B Han*, L Xing , L Wang , Stanford University School of Medicine, Stanford, CA
PO-GePV-T-325Quantitative Evaluation of the Positioning of the ExacTrac System as a Function of Treatment Table Angle for Stereotactic Radiosurgery
J Lucido*, S McCauley Cutsinger , M Grams , Mayo Clinic, Rochester, MN
PO-GePV-T-328Dosimetric Evaluation of An SRS MapCHECK for SBRT QA
F Mostafaei*, S Lin , J Salazar , A Webb , Y Lee , R Hamilton , Y Kim , Department of Radiation Oncology, University of Arizona, Tucson, AZ
PO-GePV-T-332The Clinical Impact of VOLO Optimization in CyberKnife Treatment Planning
E Schueler*, A Lo , C Chuang , S Soltys , L Wang , Stanford University, Stanford, CA
PO-GePV-T-334Optimization of the Beam Scan Pattern for Rotating Gamma Ray Systems
J Xu1*, C Ma2 , (1) Fox Chase Cancer Center, Philadelphia, PA, (2) Fox Chase Cancer Center, Philadelphia, PA
PO-GePV-T-335"Cleaning" the Dose Spill in Lung SBRT Plans
G Narayanasamy1*, D Desai2 , M Bimali3 , E Galhardo1 , H ElAsmar 2 , J Penagaricano1 , S Maraboyina1 , L Peacock1 , T Kim1 ,F Xia1 ,E Johnson4 , S Morrill1 , (1) Department of Radiation Oncology, University of Arkansas for Medical Sciences, Little Rock, AR, (2) Memorial Hospital, Hixson, TN, (3) Department of BioStatistics, University of Arkansas for Medical Sciences, Little Rock, AR (4) University of Kentucky Medical Ctr, Lexington, KY
PO-GePV-T-339Accuracy of Isocenter Location and Rotation Axis: Possible Consequences for Stereotactic Irradiations and Measurements at Elekta Linacs
L Wack*, O Sauer , University Hospital Wuerzburg, Wuerzburg, BY
PO-GePV-T-341Plan Quality Comparison of Gamma Knife and Linac-Based Stereotactic Radiosurgery in the Treatment of Multiple Brain Metastases
J Carter1*, Y Ding2 , I Vergalasova1 , X Wang1 , Y Zhang1 , J Weiner1 , N Yue1 , K Nie1 , (1) Rutgers Cancer Institute of New Jersey, New Brunswick, NJ, (2) Hubei Cancer Hospital, Wuhan, China
PO-GePV-T-345Comparison of Brain Dose Sparing and Tumor Dose Conformity From Different Photon Energies and MLC Sizes of Stereotactic Radiosurgery Treatment Strategies for Multiple Brain Tumors
J Zhang1,2,4*, Z Fan3,5, S Lee2,5, W Lien1, (1) Southern California Permanente Medical Group, Los Angeles, CA, (2) VA Long Beach Healthcare System, Long Beach, CA, (3) Cedars-Sinai Medical Center, Los Angeles, CA, (4) University of California, Irvine, Orange, CA, (5) University of California, Los Angeles, Los Angeles, CA
PO-GePV-T-357Early Clinical Experience with Halcyon Version 2 for SBRT Lung Treatments
Z Shen1*, P Ramesh1 , F Li1 , R Lalonde1 , D Heron1 , M Huq1 , (1) UPMC Hillman Cancer Center and University of Pittsburgh School of Medicine, Pittsburgh, PA
PO-GePV-T-358An Auto-Modified PTV Method to Improve Conformity for Single Isocenter Multiple Lesions SRS Conformal Dynamic Arc Plans
L Fu*, H Liu , Y Yu , Thomas Jefferson University, Philadelphia, PA
PO-GePV-T-359Comparison of Planning Techniques for Single-Isocenter Multiple-Target Stereotactic Radiosurgery
A Ballesio*, Z Wang , Duke University Medical Center, Durham, NC
PO-GePV-T-363Plan Optimization to Reduce Dose-Bridges in HyperARC Radiosurgery for Multiple Metastases and Dose Evaluation with EBT3 Film
H Park1*, J Park2 , J Lee3 , J Kim1 , M Kim1 , T Suh4 , Y Oh1 , M Chun1 , O Noh1 , (1) Department of Radiation Oncology, Ajou University School of Medicine, Suwon, South Korea (2) Department of Radiation Oncology, University of Florida, Gainesville, FL (3) Department of Radiation Oncology, Konkuk University Medical Center, Seoul, South Korea (4) Department of Biomedicine & Health Sciences, Research Institute of Biomedical Engineering, The Catholic Univerisy of Korea, College of Medicine, Seoul, South Korea
PO-GePV-T-367Stereotactic Cone-Beam CT Guided Radiosurgery of Trigeminal Neuralgia
B Ziemer , Y Natsuaki , A Perez-Andujar , O Morin , B Weethee , L Ma*, UCSF School of Medicine, San Francisco, CA 94143
PO-GePV-T-368Validating the Brainlab Cranial SRS Element for the Versa HD
C Knill*, R Sandhu , R Halford , Z Seymour , Beaumont Hospital, Dearborn, MI
PO-GePV-T-369Performance of the CBCT-Based Patient Positioning System On the Gamma Knife Icon
Andy Y. Xu1*, Yi-Fang Wang1 , Tony J. Wang1 , Simon K. Cheng1 , Olga Dona1 , Michael B. Sisti2 , Cheng-Shie Wuu1 , (1) Department of Radiation Oncology, Columbia University Medical Center, New York, NY, (2) Department of Neurosurgery, Columbia University Medical Center, New York, NY
PO-GePV-T-373Ablative Heterogeneous Dosing Scheme for Locally Advanced Pancreatic Cancer (LAPC) Via Daily CBCT-Guided DIBH
D Pokhrel*, L Sanford , J Molloy , M Bernard , University of Kentucky, Lexington, KY
PO-GePV-T-377Stereotactic Radiotherapy of Meningiomas and Tumor Beds with Gamma Knife Icon Versus Volumetric Modulated Arc Therapy
J Buatti*, J Buatti , S Yaddanapudi , E Pennington , D Wang , B Gross , J St-Aubin , D Hyer , R Flynn , University of Iowa Hospitals and Clinics, Iowa City, IA
PO-GePV-T-394Eulerian Amplification to Predict Skin Toxicity in Radiotherapy
R Culcasi*, A Hanna, M Dabjan, K Buelow, G Wilson, M Snyder, Beaumont Hospital, Royal Oak, MI
PO-GePV-T-398Evaluation of Radioprotective Effect of Melatonin Against Ionizing Radiation-Induced Toxicity in Colon
A Musa1 , D Shabeeb2*, (1) Tehran University of Medical Sciences, International Campus, Tehran, Iran. (2) Department of Physiology, College of Medicine, University of Misan, Iraq.
PO-GePV-T-400Biochemical Evaluation of Radiotherapy-Induced Small Intestinal Damage: Melatonin as Radioprotector
D Shabeeb1 , A Musa2*, G Omyan3 , (1) Department of Physiology, College of Medicine, University of Misan, Iraq. (2) Department of Medical Physics, Tehran University of Medical Sciences, International Campus, Tehran, Iran. (3) Radiotherapy Oncology Research Center, Cancer Institute, Tehran University of Medical Sciences, Tehran, Iran.
PO-GePV-T-402Cascade BED: A Supra-Heterogeneous Dose Distribution for Lung SBRT
D Pokhrel*, L Sanford , University of Kentucky, Lexington, KY
PO-GePV-T-404Maximizing the Biological Effect Via Minimizing Radiation Protraction with Flattening Filter Free (FFF) Beams for Single-Isocenter/Multi-Lesions Lung SBRT
D Pokhrel1 , L Sanford2 , M Bernard3*, R McGarry4 , M Randall5 , J Molloy6 , (1) University of Kentucky, Lexington, KY, (2) University of Kentucky, Lexington, KY, (3) University of Kentucky, Lexington, KY, (4) ,Lexington, KY, (5) ,Lexington, KY, (6) Univ Kentucky, Lexington, KY
SU-E-225BCD-7Using Millimeter-Wave Technology to Measure Patient Surface Motion During Radiotherapy
J Olick-Gibson*, P Carter, G Hugo, S Mutic, T Zhang, Washington University School of Medicine, St. Louis, MO
SU-E-301-5The Impact of Dose Heterogeneity Corrections for Post-Mastectomy Chest-Wall Boost Treatments Using HDR Plesiotherapy
M Altman1*, T Mazur2 , J Garcia-Ramirez3 , H Li4 , J Hilliard5 , I Zoberi6 , J Zoberi7 , (1) Washington University School of Medicine, St. Louis, MO, (2) Washington University School of Medicine, St Louis, MO, (3) Washington University School of Medicine, St. Loius, ,(4) Washington University School of Medicine, St. Louis, MO, (5) Washington University School of Medicine ,St. Louis, MO, (6) Washington University School of Medicine, St. Louis, MO, (7) Washington University School of Medicine, St. Louis, MO
SU-E-303-4Reducing Positive Margin Rates in Breast Conserving Surgery Using Micro Computed Tomography and Structured Light Imaging
B Maloney1*, S Streeter1 , K Paulsen1,3,4 , B Pogue1,3,4 , W Wells2,4 , R Barth3,4 , (1) Thayer School of Engineering, Dartmouth College, Hanover, NH, (2) Department of Pathology and Laboratory Medicine, (3) Department of Surgery, Geisel School of Medicine, Hanover NH 03755 (4) Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon NH 03756
SU-E-304-1Adaptive Dual Cardiac- and Respiratory-Gated Thoracic Imaging On a Linear Accelerator
T Reynolds*, C Shieh , P Keall , R O'Brien, ACRF Image X Institute, University of Sydney, NSW, Australia
SU-E-304-2Dual Energy CBCT Technique to Produce Virtual Monoenergetic and RED Images Using the On-Board Imager of a Linear Accelerator
F Cassetta1*, A Wang2 , R Patel1 , M Haytmyradov1 , J Roeske1 , (1) Loyola University Chicago, Maywood,IL,(2) Stanford University, Stanford, CA
SU-E-304-3Quantitative Dual-Energy Cone-Beam CT with a Prototype Dual-Layer Flat Panel Detector
A Wang1*, L Shi1 , N Bennett1 , E Shapiro2 , A Shiroma2 , J Zhang3 , R Colbeth2 , J Star-Lack2 , M Lu3 , (1) Stanford University, Stanford, CA, (2) Varex Imaging, San Jose, CA, (3) Varex Imaging, Santa Clara, CA
SU-E-304-4Improving Scan Time and Reducing Patient Imaging Dose Using Respiratory Motion Guided 4DCBCT
P Lim*, C Shieh, F Masri, P Keall, R O'Brien, ACRF Image X Institute, University of Sydney Central Clinical School, Sydney, NSW, Australia
SU-E-304-5Method and Test Tool for Measurement of 3D MTF Characteristics in Cone-Beam CT
P Wu1*, J Boone2 , J Siewerdsen1 , (1) Johns Hopkins Univ, Baltimore, MD, (2) UC Davis Medical Center, Sacramento, CA
SU-E-304-6Technical Assessment of Dose and 3D Imaging Performance for a New Mobile Isocentric C-Arm for Intraoperative Cone-Beam CT
N Sheth1*, T De Silva1 , A Uneri1 , M Ketcha1 , R Han1 , R Vijayan1 , G Kleinszig2 , S Vogt2 , J Siewerdsen1 , (1) Johns Hopkins University, Baltimore, MD, (2) Siemens Healthineers, Erlangen, Germany
SU-E-304-7The Corgi: A Multi-Purpose Modular Phantom for Dose and Image Quality Assessment in Cone-Beam CT
A Uneri1*, A Hernandez2 , G Burkett2 , J Boone2 , J Siewerdsen1 , (1) Johns Hopkins University, Baltimore, MD, (2) University of California-Davis, Sacramento, CA
SU-E-SAN1-4Feasibility and Uncertainty Analysis for Using Halcyon for Stereotactic Radiotherapy
J Chapman*, B Cai , S Mutic , N Knutson , Washington University School of Medicine, St. Louis, MO
SU-E-SAN1-6Implementation and Validation of An In-House Geometry Optimization Software for SRS VMAT Planning of Multiple Cranial Metastases
L Kuo*, P Zhang , H Pham , A Ballangrud , Memorial Sloan Kettering Cancer Center, New York, NY
SU-E-SAN2-4Evaluating the Stability of Radiomics Features Using 4D-CT
X Wang1*, C Ma1 , H Wang2 , Y Zhang1 , N Yue1 , K Nie1 , (1) Rutgers-Cancer Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, (2) Shanghai Chest Hospital, Shanghai Jiaotong University, Shanghai, China
SU-E-SAN4-2Dosimetry of Single Vs Multi-Course Gamma Knife Stereotactic Radiosurgery for Ten Or More Brain Metastases
C Stambaugh1*, E Kim2 , C Melhus1 , J Mignano1 , K Huber1 , J Wu1 , (1) Tufts Medical Center, Boston, MA, (2) Cornell University, Ithaca, NY
SU-E-SAN4-4Prediction of the Cone Collision in Brainlab Stereotactic Radiosurgery
J Park1*, R McDermott2 , S Kim3 , M Huq1 , (1) UPMC Hillman Cancer Center and University of Pittsburgh School of Medicine, Pittsburgh, PA (2) Baylor Scott and White Memorial Hospital, Temple, TX, (3) Virginia Mason Medical Center, Seattle, WA
SU-E-SAN4-5Radiation Survey Results and Workload Recommendations for a New Self-Shielded Stereotactic Radiosurgery (SRS) System
S Sorensen1*, S Srivastava1 , D Pinnaduwage1 , S Jani1 , X Yan1 , J Velez1, G Weidlich2 , M Bodduluri2 (1) Barrow Neurological Institute (BNI), St. Joseph's Hospital and Medical Center, Phoenix, AZ (2) Zap Surgical Systems, Inc, San Carlos, CA
SU-E-SAN4-6Total System Uncertainty of Frameless Gamma Knife Icon Treatment: Still Sub Millimeter?
W Duggar*, R He , B Morris , A Fatemi , C Yang , Department of Radiation Oncology, University of Mississippi Med. Center, Jackson, MS
SU-E-SAN4-7Verification of the Convolution Algorithm for Inhomogeneity Correction in Gamma Knife Dose Calculation
Andy Y. Xu1*, Tony J. Wang1 , Pei Fan1 , Yi-Fang Wang1 , Olga Dona1 , Horia Vulpe1 , John Adamovics2 , Michael B. Sisti3 , Cheng-Shie Wuu1 , (1) Department of Radiation Oncology, Columbia University Medical Center, New York, NY, (2) Department of Chemistry, Rider University, Lawrenceville, NJ, (3) Department of Neurosurgery, Columbia University Medical Center, New York, NY
SU-F-221AB-1A Patient-Independent CT Intensity Correction Method Using Generative Adversarial Networks (GAN) for Single X-Ray Based Tumor Localization
R Wei1*, F Zhou1 , B Liu1 , X Bai1 ,Q Wu2 , (1) Image Processing Center, Beihang University, Beijing, ,(2) Duke University Medical Center, Durham, NC
SU-F-221AB-3Evaluation of Average Image From During-Treatment 4DCBCT for Lung SBRT Treatment
J Liang1*, D Lack2, J Wloch1, D Yan1 , (1) William Beaumont Hospital, Royal Oak, MI, (2) William Beaumont Hospital, Troy, MI
SU-F-221CD-3Functional Lung Avoidance Maps to Guide Radiation Therapy: Free-Breathing Proton MRI Versus Four-Dimensional CT to Measure Specific-Ventilation in Non-Small Cell Lung Cancer
D Capaldi1*, K Sheikh2 , D Hoover3 , B Yaremko3 , D Palma3 , G Parraga4 , (1) Stanford University, Stanford, California, (2) Johns Hopkins University, Baltimore, MD, (3) London Regional Cancer Program, London, ON, (4) Western University, London, ON
SU-F-221CD-5Optimization of Spatial and Spectral Encoding for Hyperpolarized [1-13C]Pyruvate MRI
K Michel1*, C Walker1 , M Merritt2 , J Bankson1 , (1) The University of Texas MD Anderson Cancer Center, Houston, TX, (2) University of Florida, Gainesville, FL
SU-F-225BCD-5Tumor Phase Recognition by Local Principal Component with Multivariate Singular Spectrum Analysis From Cone-Beam Tomography Projections and External Surrogates
P Tsai*, B Lu , G Yan , C Liu , University of Florida, Gainesville, FL
SU-F-301-3Enabling Rotating Shield Brachytherapy with Efficient Yb-169 High-Dose-Rate Brachytherapy Source Production by Re-Activation
R Flynn1*, Q Adams1, K Hopfensperger2, X Wu1,3, W Xu3, Y Kim1, (1) Department of Radiation Oncology, The University of Iowa, Iowa City, IA, (2) Department of Biomedical Engineering, The University of Iowa, (3) Department of Electrical and Computer Engineering, The University of Iowa
SU-F-301-8A Method for On-The-Fly Resampling of Radionuclide Energy Deposition Kernels for Convolution-Based Voxelwise Dosimetry
S Graves*, D Hyer , R Flynn , J Sunderland , University of Iowa Hospitals and Clinics, Iowa City, IA
SU-F-304-1Fast 4D CBCT Scans: Combining Respiratory Guided Imaging and Advanced Reconstruction Algorithms to Reduce Imaging Time and Dose
O Dillon*, R O'Brien , C Shieh , P Keall , University of Sydney, Sydney, NSW
SU-F-304-2Deformation Vector Field Estimation Using Convolutional Neural Network for Motion-Compensated 4D-CBCT Reconstruction
X Huang*, L Chen , J Wang , UT Southwestern Medical Center, Dallas, TX
SU-F-304-4General Simultaneous Motion Estimation and Image Reconstruction (G-SMEIR) for CBCT
S Zhou1*, Y Chi1 , J Wang2 , M Jin1 , (1) University of Texas at Arlington, Arlington, TX, (2) UT Southwestern Medical Center, Dallas, TX
SU-F-304-6Known-Component Metal Artifact Reduction (KC-MAR) for Intraoperative Cone-Beam CT in Spine Surgery: A Clinical Pilot Study
X Zhang1*, A Uneri1 , S Doerr1 , J Stayman1 , C Zygourakis2 , S Lo2 , N Theodore2 , J Siewerdsen1 , (1) Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, (2) Department of Neurosurgery, Johns Hopkins Medicine, Baltimore, MD
SU-F-SAN1-3Denoising of Monte Carlo Dose Distributions Using UNet
U Javaid1*, K Souris1 , D Dasnoy1 , A Barragan Montero1 , S Huang2 , J Lee1 , (1) UCLouvain, Belgium,(2) Memorial Sloan Kettering Cancer Center, New York, NY
SU-F-SAN2-1CBCT Image Quality Augmentation Using Deep Learning Models: A Comparison Study
Y Zhao1*, Z Jiang2 , X Teng1 , L Ren2 , (1) Duke Kunshan University, Kunshan,(2) Duke Univeristy, Durham, NC
SU-F-SAN2-8Hybrid Virtual MRI/CBCT Generation Using An Unsupervised Convolutional Neural Network (CNN) with Transfer Learning
Y Chen1*, F Yin2 , L Ren3 , (1) Duke University, Durham, NC, (2) Duke University Medical Center, Durham, NC, (3) Duke University Medical Center, Durham, NC
SU-F-SAN4-2An In-House Developed Second Dose Calculation System for Leksell Gamma Knife Perfexion and Icon
Z Tian*, X Yang, D M Giles, T Wang, E Butker, S Kahn, T Liu, Emory Univ, Atlanta, GA
SU-F-SAN4-4Exploration of Setup Margin in Frameless Gamma Knife Radiosurgery with the Icon
W Duggar*, R He , B Morris , C Yang , Department of Radiation Oncology, University of Mississippi Med. Center, Jackson, MS
SU-F-SAN4-6Single-Isocenter VMAT-Based Stereotactic Radiosurgery (SRS) for Multiple Brain Metastases: Potential Loss of Target Coverage Due to Isocenter Misalignment
A Palmiero1*, J Molloy2 , M Sanders3 , M Randall4 , D Pokhrel5 , (1) University of Kentucky, Lexington, KY, (2) Univ Kentucky, Lexington, KY, (3) Univ Kentucky, Lexington, KY, (4) ,Lexington, KY, (5) University of Kentucky, Lexington, KY
SU-F-SAN4-8Clinical Evaluation of Lung SBRT for the Halcyon Platform and Dosimetric Comparison with the Truebeam STx and Millennium MLC Systems
C Kennedy*, R Scheuermann , D Mihailidis , University of Pennsylvania, Philadelphia, PA
SU-G300-SPS-F4-2Effects of Acoustic Heterogeneity in X-Ray-Induced Acoustic Computed Tomography
C Cochran1*, P Samant2 , L Xiang3 , (1) University of Oklahoma, Norman, OK, (2) University of Oklahoma, Norman, OK, (3) University of Oklahoma, Norman, OK
SU-G300-SPS-F4-7Prediction of Acute Xerostomia in Nasopharyngeal Cancer for Radiotherapy Using 3D Convolutional Neural Network
Y LIU1*, X CHEN2 , s Huang3 , H SHI4 , H ZHOU5 , H CHANG6 , Y XIA7 , X Yang8 , (1) School of Software Engineering, South China University of Technology, Guangzhou, ,(2) School of Software Engineering, South China University of Technology, Guangzhou,(3) State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, Guangdong, (4) School of Software Engineering, South China University of Technology, Guangzhou, ,(5) the 74th Group Army Hospital of the Chinese People's Liberation Army, Guangzhou, ,(6) SYSUCC, Guangzhou, ,(7) SYSUCC, Guangzhou, ,(8) Sun Yat-Sen University Cancer Center (SYSUCC), Guangzhou City
SU-I300-GePD-F5-1Analysis of MAA Distribution in Liver with Tumor
D Bakalyar1*, (1) Henry Ford Health System, Detroit, MI
SU-I300-GePD-F6-1Auto Segmentation of Male Pelvis On CBCT Using 3D U-Net
R L.J. Qiu1*, T Ma1 , K Stephans1 , C Shah1 , A Godley2 , P Xia1 , (1) Cleveland Clinic, Cleveland, OH, (2) Miami Cancer Institute, Miami, FL
SU-I300-GePD-F6-3Effects of CT Image Acquisition and Reconstruction Parameters On Automatic Contouring Algorithms
K Huang*, D Rhee , R Ger , R Layman , J Yang , C Cardenas , L Court , MD Anderson Cancer Center, Houston, TX
SU-I300-GePD-F6-6Using a Bayesian Neural Network Approximation to Quantify the Uncertainty in Segmentation Prediction On Prostate Cancer
D Nguyen*, A Balagopal , C Shen , M Lin , R Hannan , S Jiang , Medical Artificial Intelligence and Automation (MAIA) Laboratory, Department of Radiation Oncology, UT Southwestern Medical Center, Dallas, TX, USA
SU-I300-GePD-F9-1A Dosimetric Evaluation of Daily CBCT Imaging for Prostate Radiotherapy
A Gopal*, B Zhang , S Lee , G Lasio , S Chen , B Yi , Univ. of Maryland School Of Medicine, Baltimore, MD
SU-I300-GePD-F9-2Characterization of Underexposure in CBCT Projections Toward Patient Specific Acquisition Protocol Guidelines
B Preusser*, E Pearson , H Al-Hallaq , The University of Chicago, Chicago, IL
SU-I300-GePD-F9-6Optimal CBCT Parameters for SRS Image Guidance
E Sudentas*, N Kalach , Mount Sinai West, New York, NY
SU-I330-GePD-F4-1Characterization and Validation of SRS MapCheck for Patient Specific QA On CyberKnife M6
D Parsons1*, C Ding1 , B Zhao1 , T Chiu1 , L Tirpak2 , R Reynolds1 , Y Park1 , Y Yan1 , S Jiang1 , X Gu1 , (1) UT Southwestern Medical Center, Dallas, TX, (2) Sun Nuclear Corporation, Melbourne, FL
SU-I330-GePD-F4-3On the Spatial Accuracy of Single Isocenter Multiple Brain Metastases SRS with BrainLab Elements
D Saenz*, J McCulloch , K Rasmussen , N Kirby , P Myers , S Stathakis , N Papanikolaou , University of Texas HSC SA, San Antonio, TX
SU-I330-GePD-F5-2Delineating ITV From 4DCT with Irregular Breathing
B Guo1*, P Xia1 , (1) The Cleveland Clinic Foundation, Cleveland, OH
SU-I330-GePD-F5-3Evaluating a Model-Based 4DCT Technique for Managing Respiration-Induced Motion of Abdominal Tumors
D O'Connell*, M Lauria , J Lewis , A Santhanam , A Raldow , P Lee , D Low , Department of Radiation Oncology, University of California, Los Angeles, Los Angeles, CA
SU-I330-GePD-F5-4Validation of Simulated Target Motion Spatial Accuracy of Elekta Symmetry Versus 4D CT
C Baley*, S Stathakis , P Myers , N Kirby , K Rasmussen , N Papanikolaou , D Saenz , University of Texas HSC SA, San Antonio, TX
SU-I330-GePD-F5-5Benchmarking of 4DCBCT Based Dose Calculation Against Measurements in a Lung Phantom
M Dumas*, S Rusu , I Chetty , N Wen , Henry Ford Health System, Detroit, MI
SU-I330-GePD-F5-6Clinical Implementation of Four-Dimension Cone-Beam Computed Tomography (4D-CBCT) for Gated Treatment
F Mostafaei*, Y Lee , Y Kim , Department of Radiation Oncology, University of Arizona, Tucson, AZ
SU-I330-GePD-F6-2Development of Detector for Ultra-Fast Beam Diagnostics in Proton Radiotherapy
V Iakovenko1,2*, D Jaffray2,3,4 , (1) Sunnybrook Health Sciences Centre, Toronto, ON, (2) University of Toronto, Toronto, ON, (3) University Health Network, Toronto, ON, (4) Techna Institute, Toronto, ON
SU-I330-GePD-F7-2Anatomically Informed Template Trajectories for Stereotactic Radiotherapy and Radiosurgery
J D Lincoln1*, R L MacDonald2 , B Little3 , A Syme1,3 , C G Thomas1,3 , (1) Dalhousie University, Halifax, NS, (2) Odette Cancer Centre, Toronto, ON, (3) Nova Scotia Cancer Centre, Halifax, NS
SU-I330-GePD-F7-6SBRT Optimization Using NTCP Objectives Regarding Carotid Blowout Syndrome
Z Karakas1*, E Schreiber2 , J Grimm3 , M Cengiz4 , G Yazici5 , G Ozyigit6 , S Stathakis7 , N Papanikolaou8 , S Das9 , P Mavroidis10 , (1) University of North Carolina, Chapel Hill, NC, (2) Univ North Carolina, Chapel Hill, NC, (3) Johns Hopkins University, Baltimore, MD, (4) ,Ankara, ,(5) ,Ankara, ,(6) ,Ankara, ,(7) University Of Texas Health, San Antonio, TX, (8) University of Texas HSC SA, San Antonio, TX, (9) Univ North Carolina, Chapel Hill, NC, (10) Univ North Carolina, Chapel Hill, NC
SU-I330-GePD-F8-1A Compact High Voltage System for Experimental X-Ray Sources
A Cramer1,2*, J Caines2 , T Moulton3 , K Yang3 , W Krull3 , R Gupta2,3 , (1) MIT, Cambridge, MA, (2) Harvard, Cambridge, MA, (3) Massachusetts General Hospital, Boston, MA
SU-I330-GePD-F9-1A Fast, Accurate Simulation Strategy for MV-CBCT Image Generation
M Shi1,2*, M Myronakis2 , M Jacobson2 , M Lehmann3 , P Huber3 , R Fueglistaller3 , P Baturin4 , D Morf3 , D Ferguson2 , T Harris2 , I Valencia Lozano2 , C Williams2 , Y Hu2 , A Wang4 , R Berbeco2 , (1) University of Massachusetts Lowell, Lowell, MA, (2) Brigham and Women's Hospital, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA, (3) Varian Medical Systems, Baden-Dattwil, Switzerland, (4) Varian Medical Systems, Palo Alto, CA
SU-I330-GePD-F9-2An Analysis of the Commercially Available CBCT Based On Iterative Reconstruction Algorithm for IGRT
S Kang1,3*, J Chung1 , S Lee2 , S Kang3 , T Suh3 , J Kim1 , (1) Seoul National University Bundang Hospital, Seongnam Si, Korea, (2) Konyang University of Korea, Daejeon, Korea,(3) The Catholic University of Korea, College of Medicine, Seoul, Korea
SU-I330-GePD-F9-3CT Based Simulation Framework for Motion Artifact and Ground Truth Generation of Cone-Beam CT
P Paysan1*, P Munro1, S Scheib1, (1) Varian Medical Systems Imaging Laboratory, Daettwil AG
SU-I330-GePD-F9-5Monte Carlo X-Ray Tube Simulation for CBCT: Primary Source Phase Space Compression
G Bootsma1*, H Nordstrom2 , M Eriksson2 , D Jaffray1 , (1) University Health Network, Toronto, ON, Canada (2) Elekta Instruments AB, Stockholm, Sweden
SU-I330-GePD-F9-6Pseudo-CBCT Image Prediction of Head and Neck Cancer Patient Using Principal Component Vector Fields of Early Treatment Fractions
M Nakano1*, T Imae2 , T Nakamoto2 , A Haga3 , K Nawa2 , Y Nomura2 , R Chhatkuli4 , K Demachi5 , W Takahashi2 , K Yamamoto6 , K Nakagawa2 , M Hashimoto7 , Y Yoshioka1 , M Oguchi1 , (1) Cancer Institute Hospital of JFCR, Tokyo, Japan, (2) Department of Radiology, The University of Tokyo Hospital, Tokyo, Japan, (3) University of Tokushima, Tokushima, Japan, (4) National Institute of Radiological Sciences, Chiba, Japan,(5) Faculty of Engineering, The University of Tokyo, Tokyo, Japan, (6) Department of Radiology, Teikyo University Hospital, Tokyo, Japan, (7) Faculty of Allied Health Sciences, Kitasato University, Sagamihara, Japan
SU-I400-GePD-F4-1Combining Radiotherapy and Nano-Immunotherapy to Boost the Abscopal Effect in Cervical Cancer
J Wood1,2*, R Mueller1,3,4 , S Yasmin-Karim1,5 , W Ngwa1,5,6 , (1) Dana-Farber Cancer Institute, Brigham and Women's Hospital, Boston, MA (2) University of Veterinary Medicine and Pharmacy in Kosice, Kosice, Slovakia (3) University Medical Center Mannheim, Heidelberg University, Mannheim, Germany (4) Heidelberg University, Heidelberg, Germany (5) Harvard Medical School, Boston, MA (6) University of Massachusetts Lowell, Lowell, MA
SU-I400-GePD-F6-1An Experimental Evaluation of Mega-Voltage Fan-Beam CT Using a Linear Accelerator
H Gong1*, S Tao1 , J Gagneur2 , W Liu2 , C McCollough1 , Y Hu2 , S Leng1 , (1) Mayo Clinic, Rochester, MN, (2) Mayo Clinic Arizona, Phoenix, AZ
SU-I400-GePD-F6-2Clinical Improvements of Using Iterative Reconstructed MVCT for IGRT
G Chen*, S Lim , K Kainz , X Li , Medical College of Wisconsin, Milwaukee, WI
SU-I400-GePD-F6-3Evaluating the Need for CBCT Image Guidance for Brain SRS with ExacTrac
R Martin*, T Briere , E Han , MD Anderson Cancer Ctr., Houston, TX
SU-I400-GePD-F6-4Image Registration Workflow for Frameless GammaKnife Icon Treatment
KE Mooney*, E Hubley , M Schelin , Y Yu , W Shi , H Liu , Thomas Jefferson University, Philadelphia, PA
SU-I400-GePD-F6-5Inter-Fractional Rotational Repositioning Accuracy in Gamma Knife ICON Radiosurgery
K Bernstein*, T Qu , D Kondziolka , J Silverman , New York Univ Medical Center, New York, NY
SU-I400-GePD-F6-6Multi-Institution Analysis of Cone-Beam CT Image Quality Performance
N Becker1*, A McNiven1 , L Buckley2 , P Rapley3 , E Sabondjian4 , D Jaffray1 , D Letourneau1 , (1) The Princess Margaret Cancer Centre - University Health Network, Toronto, ON, (2) The Ottawa Hospital Regional Cancer Centre, Ottawa, ON, (3) Thunder Bay Regional Health Sciences Centre, Thunder Bay, ON, (4) Mississauga Halton/Central West Regional Cancer Program - Trillium Health Partners, Mississauga, ON
SU-I400-GePD-F8-1Deep-Learning Based Classification of Alzheimer's Disease Using Resting-State Functional MRI Time Series
Z Yang1*, E Zhang1 , S Yu2 , Z Wardak1 , M Chen1 , W Lu1 , X Gu1 , (1) UT Southwestern Medical Center, Dallas, TX, (2) Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong
SU-I400-GePD-F8-5Rapid Diffusion Weighted MR Imaging Based On Neural Networks
S Srinivas*, Y Cao , The University of Michigan, Ann Arbor, MI
SU-I400-GePD-F9-1Accuracy of the Helically-Acquired CTDIvol as An Alternative to Traditional Methodology
S Leon1*, R Kobistek2 , Z Zhang3 , E Olguin4 , I Barreto5 , B Schwarz6 , (1) University of Florida, Gainesville, FL, (2) Nat'l Physics Consultants, Ltd, Mentor, OH, (3) University of Florida, Gainesville, FL, (4) University of Florida ,Gainesville, FL, (5) University of Florida, Gainesville, FL, (6) University of Florida, Gainesville, FL
SU-I400-GePD-F9-2Assessment of Regional Computed Tomography DoseIndices in India Towards Establishing DRL
A Saravana Kumar*, R Rajakumar , A Jose , D Balalakshmoji , PSG Institute of Medical Sciences and Research, Coimbatore, TN
SU-I430-GePD-F4-2Characterization of a Gynaecological Titanium Applicator for Direct Reconstruction On MRI
A Otal1,4*, J Vijande2,4 , F Ballester2,4 , A Forner1 , O Ripol1 , C Monfa1 , S Serrano1 , J Perez-Calatayud3,4 (1) Hospital Universitari Arnau de Vilanova, Lleida (2) University of Valencia, Burjassot (3) Hospital La Fe, Valencia (4) Medical Physics Research Group La Fe-UVEG
SU-I430-GePD-F5-3Intrafraction Imaging of the CBCT Simultaneous to VMAT Delivery Provides Patient-Tumor Positioning Verification and Potential for Optimizing Off-Line Adaptive Treatment Planning
D Campos1*, A Hernandez2 , D Hernandez3 , S Benedict4 , (1) University of California - Davis, Sacramento, CA, (2) University of California-Davis, Sacramento, CA, (3) Univ of California, Davis, Sacramento, CA, (4) UC Davis Cancer Center, Sacramento, CA
SU-I430-GePD-F5-6Tumor Tracking and Motion Modeling in SBRT of Abdominal Tumors with Implanted Fiducials Using Pre-Treatment CBCT Projections and Template Matching and Sequential Stereo Triangulation
O Oderinde1*, H Mostafavi2 , D Simpson1 , J Murphy1 , L Cervino1 , (1) University of California San Diego, San Diego, CA, (2) ,Palo Alto, CA,
SU-I430-GePD-F6-2Machine Learning Based Region of Interest Optimization Framework for Optical Surface Monitoring System: A Feasibility Study
T Chen*, D Barbee , P Cohen , K Du , New York University, New York, NY
SU-I430-GePD-F6-4The Analysis of Positioning Accuracy for Frameless Noncoplanar Stereotactic Radiosurgery Treatment Using Optical Surface Monitoring System
S Wang1*, X Qian2 , Y Ma3 , (1) Department of Radiation Oncology, Saint Alphonsus Cancer Care Center, Boise, ID, (2) Department of Radiation Oncology, Stony Brook University Hospital, Stony Brook, NY, (3) Department of Radiation Oncology and Oncology Area of the CHU de Quebec Research Center, Hotel-Dieu de Quebec, Quebec, Canada
SU-I430-GePD-F8-1Functional Networks in Health and Cancerous Brains Related to Language FMRI
Q Li1*, G Ferraro1 , L Pasquini2 , K Peck2 , H Makse1 , A Holodny2 , (1) City College of New York, New York, NY, (2) Memorial Sloan Kettering Cancer Center, New York, NY.
SU-I430-GePD-F8-3Lung Feature Tracking in 4DMRI Using a Scale-Invariant Feature Transform Method
E Colvill1*, E Gaberdiel2 , A Lomax1 , O Bieri3 , Z Celicanin3 , D Weber1 , G Fattori1 , (1) Paul Scherrer Institute, Villigen, Switzerland, (2) Cambridge University, Cambridge, United Kingdom,(3) Division of Radiological Physics, Department of Radiology, University Hospital Basel, University of Basel, Basel, Switzerland and Department of Biomedical Engineering, University of Basel, Basel, Switzerland
SU-I430-GePD-F9-1CT Textures in Selection Optimization of HPV-Associated Oropharynx Cancer Patients for Transoral Robotic Surgery
T Bejarano*, M Samuels , G Thomas , F Civantos , J Leibowitz , L Freedman , S Samuels , I Mihaylov , Univ Miami, Miami, FL
SU-I430-GePD-F9-4Quantitative Evaluation of Image Quality in Low Dose CT Images Obtained by Deep Learning
D Lee*, H Kim ,
SU-I430-GePD-F9-5Step-Wise Solution to Evaluate CT Radiomic Feature Variability Due to Correlated Noise Texture
M Shafiq ul Hassan1*, F Guo1 , H Chen1 , G Zhang2 , E Moros2 , Z Chen1 , (1) Yale New Haven Hospital, New Haven, CT, (2) Moffitt Cancer Center, Tampa, FL,
SU-I430-GePD-F9-6Subset of Reproducible Radiomic Features as a Function of Multiple CT Imaging Parameters
M Shafiq ul Hassan1*, F Guo1 , H Chen3 , G Zhang4 , E Moros5 , Z Chen6 , (1) Yale New Haven Hospital, New Haven, CT, (2) Yale New Haven Hospital, New Haven, CT, (3) Yale New Haven Hospital, New Haven, CT, (4) H. Lee Moffitt Cancer Center, Tampa, FL, (5) H. Lee Moffitt Cancer Center, Tampa, FL, (6) Yale Univ. School of Medicine & YNHH, New Haven, CT
SU-J400-CAMPUS-F1-1Analytical Modeling of 30-300 KV X-Ray Spectra Taking Into Account the Intrinsic Bremsstrahlung Angular Distribution
A Omar*, P Andreo, G Poludniowski, Karolinska University Hospital, Stockholm
SU-J400-CAMPUS-F1-5Raman Spectroscopy for Assessing Radiation-Induced Pulmonary Fibrosis
S Devpura1*, S Brown1 , S Sethi2 , F Siddiqui1 , A Pandya3 , I Chetty1 , (1) Henry Ford Health System, Detroit, MI, (2) VA University of Michigan, Ann Harbor, MI, (3) Wayne State University, Detroit, MI
SU-J400-CAMPUS-F2-2Observer-Independent, Hand-Crafted Radiomic Features Predict GBM Patient-Specific Survival
E Carver1*, N Wen2 , E Liang3 , J Snyder4 , (1) Wayne State University, Troy, MI, (2) Henry Ford Hospital, Detroit, MI, (3) HFHS, Detroit, ,(4) HFHS, Detroit,
SU-K-221AB-2On the Quantitative Analysis of Biomechanical Lung Model Consistency Using 5DCT Datasets
B Stiehl1*, M Lauria1 , D O'Connell1 , K Hasse2 , I Barjaktarevic1 , P Lee1 , D Low1 , A Santhanam1 , (1) University of California, Los Angeles, Los Angeles, CA, (2) University of California, San Francisco, San Francisco, CA
SU-K-221AB-3Patch-Based Local Intensity Correction for CT/CBCT Deformable Registration
S Proell1, K Fritscher1, G Sharp2*, (1) UMIT, Hall In Tirol, Austria, (2) Massachusetts General Hospital, Boston, MA
SU-K-221AB-7Evaluation of Deformable Image Registration Accuracy in Pediatric Radiotherapy Following TG-132 Recommendations
O Ates*, L Zhao , C Hua , T Merchant , St. Jude Childrens Research Hospital, Memphis, TN
SU-K-221CD-1A Deep-Learning Based Lower-Dose CT Simulation Technique in Image Domain
H Gong*, S Leng , C McCollough , L Yu , Mayo Clinic, Rochester, MN
SU-K-221CD-3Exploring the Limits of Size-Specific Dose Estimates (SSDE) as An Estimate of Lung and Breast Dose From Routine Chest CT Examinations
A Hardy*, M Bostani , C Cagnon , M McNitt-Gray , University of California, Los Angeles, Los Angeles, CA
SU-K-221CD-5Vendor Neutral Method to Create AEC Optimized Pediatric CT Body Protocols Based On Aggregate Clinical Data
M Lipford*, T Szczykutowicz , University Wisconsin-Madison, Madison, WI
SU-K-221CD-6A Factor of 5 Dose Reduction Using Spectral Shaping On PCD-CT for Ultra-High Resolution Temporal Bone Imaging
W Zhou*, K Rajendran , S Tao , B Voss , J Lane , M Carlson , D DeLone , J Fletcher , C McCollough , S Leng , Mayo Clinic, Rochester, MN
SU-K-221CD-7Impact of Tube Potential On Water Equivalent Diameter and Size Specific Dose Estimate Values for Head, Chest, and Abdomen CT Scans
S McCollough*, T Moen , J Schneider , T Vrieze , S Leng , C McCollough , Mayo Clinic, Rochester, MN
SU-K-225BCD-6Improving CBCT Quality to CT Level Using Deep-Learning Method for Adaptive Radiation Therapy
Y Zhang1,2*, N Yue1 , M Su2 , Y Ding3 , B Liu1 , Y Zhang1 , Y Zhou4 , K Nie1 , (1) Department of Radiation Oncology, Rutgers-Cancer Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, New Brunswick, NJ, (2) Department of Radiological Science, University of California Irvine, Irvine, CA, (3) Hubei Cancer Hospital, Wuhan,(4) Fudan University Zhongshan Hospital, Shanghai
SU-K-301-1A Systematic Evaluation of the Error Detection Abilities of a Novel Diode Transmission Detector
V Sarkar*, A Paxton , J Kunz , M Szegedi , G Nelson , F Su , Y Huang , H Zhao , P Rassiah-Szegedi , B Salter , University of Utah, Salt Lake City, UT
SU-K-SAN1-2In Silico Modelling of Dose Dependent Microvasculature Damage with Sparing Effect From Microbeam Irradiation
M Alp*, Y Fan , M Alonso-Basanta , B Teo , E Diffenderfer , G Kurtz , Y Xiao , R Lustig , L Dong , W Zou , University of Pennsylvania, Philadelphia, PA
SU-K-SAN1-4On the Discrepancy of Experimental and Monte-Carlo Simulated Dose Response of the MicroDiamond Detector: The Role of Charge Imbalance in Structural Components
HK Looe1*, D Poppinga2 , R Kranzer2 , I Buesing1 , T Tekin1 , AB Ulrichs1 , B Delfs1 , D Vogt2 , J Wuerfel2 , B Poppe1 , (1) University Clinic for Medical Radiation Physics, Medical Campus Pius Hospital, Carl von Ossietzky University, Oldenburg, Germany (2) PTW Freiburg, Germany
SU-K-SAN1-6Using Sun Nuclear SRS MapCHECK and StereoPHAN to Evaluate the Accuracy of SRS/SRT Deliveries On An Elekta Linac with ExacTrac Position Verification and Hexapod Position Correction
Y Liang*, D Pavord , H Lee , M Chetvertkov , S Lee , S Oh , M Goss , R Wegner , S Karlovits , R Fuhrer , D Parda , J Sohn , Allegheny Health Network, Pittsburgh, PA
SU-KL-304-3A New Methodology for Reconstruction of 4D-PET Images
H Zhong*, X Li , Medical College of Wisconsin, Milwaukee, WI
SU-KL-304-9Validation of a Non Invasive Positron Detector for Use with Dynamic PET Under Clinical Conditions
L Carroll1*, G KERTZSCHER2 , E Croteau3 , O Sarrhini4 , R Lecomte5 , S Abbasi Nejad Enger6 , (1) McGill University, Montreal, QC, (2) Aarhus University Hospital, Aarhus, ,(3) Sherbrooke University, Sherbrooke, ,(4) Sherbrooke University, Sherbrooke, ,(5) Sherbrooke University, Sherbrooke, ,(6) McGill University, Montreal, QC
SU-L-221AB-2Feasibility and Preliminary Results of Sparing Stem Cell Containing Salivary Ducts Via MRI Sialography in Patients with Oropharynx Cancer
D Fried1*, T Zhu1 , S Das1 , C Shen1 , L Marks1 , B Chera1 , (1) University of North Carolina at Chapel Hill, Chapel Hill, NC
SU-L-221AB-7Assessment of the Liver Functions in Different Dose Region After SBRT Using HIDA SPECT Scans
K C Huang1*, D Long1 , Y Yue1 ,M Tann2 , R Rhome1 , P Maxim1 , S Ellsworth1 , (1) Department of Radiation Oncology, Indiana University - School of Medicine, Indianapolis, IN, (2) Department of Radiology, Indiana University - School of Medicine, Indianapolis, IN
SU-L-221CD-3Experimental Assessment of Dual-Energy CT Estimation Bias Reduction with Joint Statistical Image Reconstruction in Sinogram Domain-Based Material Decomposition
J Lu1 , S Zhang2 , J Williamson3 , T Webb4 , D Politte5 , B Whiting6 , J O'Sullivan7*, (1) Washington University, St. Louis, MO, (2) Washington University, St. Louis, MO,(3) Washington University, St. Louis, MO, (4) Washington University, St. Louis, MO, (5) Washington University, St. Louis, MO,(6) University of Pittsburgh, Pittsburgh, PA, (7) Washington University, St. Louis, MO
SU-L-221CD-5High-Resolution Spectral Micro-CT: System Design, Reconstruction Method and Preliminary Results
Q Wang1*, Y Zhu2 , S Deng2 , H Zhang2 , H Yu1 , (1) University of Massachusetts Lowell, Lowell, MA, (2) Capital Normal University, Beijing
SU-L-221CD-6Multiple Resolution Residual Network for Automatic Lung Tumor and Lymph Node Segmentation Using CT Images
H Um*, J Jiang , A Rimner , L Luo , J Deasy , M Thor , H Veeraraghavan , Memorial Sloan Kettering Cancer Center, New York, NY
SU-L-221CD-8Respiratory Motion Characterization and Motion Artefact Reduction Using Volumetric 4-Dimensional Computed Tomography
H Young1,2,3*, T Lee1,2 , S Gaede1,3 , (1) Western University, London, ON, (2) Robarts Research Institute, London, ,(3) London Regional Cancer Program, London, ON
SU-L-225BCD-4Automatic Classification of Dental Artifact Status for Efficient Image Veracity Checks
M Welch1*, L Wee2 , C McIntosh1 , A Traverso2 , A Dekker2 , D Jaffray1 , (1) University Health Network, Toronto, Canada, (2) MAASTRO Clinic, Maastricht, Netherlands
SU-L-225BCD-7Learning-Based Automatic Segmentation of Arteriovenous Malformations On Contrast CT Images in Brain Stereotactic Radiosurgery
T Wang*, Y Lei , S Tian , X Dong , X Jiang , J Zhou , T Liu , S Dresser , W Curran , H Shu , X Yang , Emory Univ, Atlanta, GA
SU-L-302-1A Simple, Yet Novel Hybrid-Dynamic Conformal Arc (h-DAC) Therapy Planning Via FFF-Beam for Stereotactic Body Radiosurgery (SBRS) of Lung Lesion
M Halfman*, L Sanford , J Molloy , D Pokhrel , University of Kentucky, Lexington, KY
SU-L-302-2A New Design for Rapid Acquisition of Cone Beam CT Images On C-Arm Style Medical Linear Accelerators
E Parsai*, E Salari , N Sperling , University of Toledo Medical Center, Toledo, OH
SU-L-302-7Real-Time Image-Guided Treatments Using a Compact Fixed-Beam Radiotherapy System
PZY Liu1*, S Heng2 , R O'Brien1 , D Nguyen1 , S Downes2 , M Jackson2 , P Keall1 , (1) ACRF Image X Institute, University of Sydney Central Clinical School, Sydney, NSW, Australia (2) Nelune Comprehensive Cancer Centre, Prince of Wales Hospital, Randwick, NSW, Australia
SU-L-SAN1-1Characterization of a Novel Scintillator Imaging-Based Surface Dosimeter
I Tendler1*, P Bruza1 , M Jermyn2 , X Cao1 , B Williams3,4 , L Jarvis3,4 , B Pogue1,2,3 , D Gladstone1,3,4 , (1) Thayer School of Engineering, Dartmouth College, Hanover, NH, (2) DoseOptics LLC, Lebanon, NH, (3) Dept. of Medicine, Geisel School of Medicine, Dartmouth College, Hanover, NH (4) Norris Cotton Cancer Center, Dartmouth-Hitchcock Med. Ctr., Lebanon, NH, (5)
SU-L-SAN1-5End-To-End Test of the Gamma Knife Icon Plan Adaptation and High Definition Motion Management System Using a Motorized Anthropomorphic Head Phantom
E Han1 , D Luo1 , J Kim2 , K Tharp1 , Z Wen1*, T Briere1 , (1) The University of Texas MD Anderson Cancer Center, Houston, TX, (2) University of Pittsburgh Medical Center, Gibsonia, PA,
SU-L-SAN4-2An Integrated Stereotactic Radiosurgery Quality Assurance Phantom for Dosimetry and Coincidence Verification of Multiple Positioning Systems
L Skinner1*, P Dubrowski1 , D Capaldi1 , A Yu1, (1) Stanford University Cancer Center, Stanford, CA.
TH-A-221AB-2A Flexible Iterative Reconstruction Framework for Low Dose CT
Q Lyu*, D Ruan , J Hoffman , R Neph , M McNitt-Gray , K Sheng , UCLA School of Medicine, Los Angeles, CA
TH-A-221AB-3Quantitative Prior-Image-Based CT Reconstruction with Mismatched Prior
H Zhang1*, D Capaldi2 , D Zeng3 , J Ma4 , L Xing5 , (1) Stanford University, Stanford, CA, (2) Stanford University, Stanford, California, (3) Southern Medical University, Guangzhou, ,(4) Southern Medical University, Guangzhou, ,(5) Stanford University, Stanford, CA
TH-A-221AB-4Noise Reduction in CT Image Using Prior Knowledge Aware Iterative Denoising
S Tao*, K Rajendran , W Zhou , C McCollough , S Leng , Mayo Clinic, Rochester, MN
TH-A-221AB-9Respiratory Adaptive Computed Tomography (REACT) Reduces 4DCT Imaging Artifacts Through Prospective Gating: First Experimental Results
N Morton1*, J Sykes2 , J Barber2 , C Hofmann3 , P Keall1 , R O'Brien1 , (1) University of Sydney, Sydney, , (2) Blacktown Hospital, Blacktown, ,(3) Advanced Therapies, Siemens Healthcare GmbH, Forchheim, ,
TH-A-221AB-10Impact of Radiation Dose On Quantification Accuracy of Penumbra and Infarct Core Volume in CT Brain Perfusion
J Browne*, M Bruesewitz , T Vrieze , E Lindell , C McCollough , L Yu , Mayo Clinic, Rochester, MN
TH-A-221AB-11A Method for Automated Repeat/reject Rate Analysis in CT
S Rose*, B Viggiano , T Szczykutowicz , University Wisconsin-Madison, Madison, WI
TH-A-225BCD-8Hands Off Deep Learning Derived Synthetic CT and Contour Driven Multimodal Registration in the Head and Neck
E McKenzie*, N Tong , A Santhanam , M Cao , D Ruan , K Sheng , UCLA School of Medicine, Los Angeles, CA
TH-A-303-4Comparison Between Deep Learning and Total Generalized Variation Methods for Fast MRI
Z Jiang*, F Yin, Z Chang , Duke University Medical Center, Durham, NC
TH-A-303-6Evaluation of Brain Normalization Methods and Their Effect On the Construction of Functional Connectomics in Patients with Gliomas
H Chen*, V Kumar , J Johnson , K Noll , S Prabhu , D Schomer , H Liu , UT MD Anderson Cancer Center, Houston, TX
TH-A-303-9MRI Radio Frequency Power Amplifier Linearization with Pre-Distortion Based On Artificial Neural Network
W Lu*, W Lu , L Shi , K Hou , H Zhao , J Qiu , Department of Radiology, Taishan Medical University, Taian, Shandong
TH-A-303-11Radiotherapy-Specific Imaging Prior Knowledge and Its Impact in Deep Learning Based Cranial Pseudo-CT Generation
M Law*, J Yuan* , G Lo^ , O Wong* , Y Zhou* , S Yu* , *Medical Physics and Research Department, ^Department of Diagnostic & Interventional Radiology, Hong Kong Sanatorium & Hospital, Hong Kong
TH-A-SAN2-10Adaptive Margins with An Early Warning System for Motion-Tracking Errors in Liver SBRT
M Liu1*, A Ross2 , J E Cygler1,3,4 , E Vandervoort1,3,4 (1) Department of Physics, Carleton University, Ottawa, ON, Canada (2) Department of Physics, McGill University, Montreal, QC, Canada (3) Department of Medical Physics, The Ottawa Hospital Cancer Centre, Ottawa, ON, Canada (4) Department of Radiology, University of Ottawa, Ottawa, ON, Canada
TH-B-SAN4-0Immunotherapy Killed the IGRT Star
H Al-Hallaq*, S Chmura*, The University of Chicago, Chicago, IL
TH-BC-225BCD-6Focal Liver Reaction Threshold Dose in Liver Stereotactic Body Radiation Therapy (SBRT): Does Inter-Fractional Variability Matter?
S Kuznetsova1*, P Grendarova2 , S Roy3 ,R Sinha2 , N Ploquin1,4 , K Thind1,4 , (1)Department of Physics and Astronomy, University of Calgary, Calgary, AB, Canada (2) Department of Oncology, Division of Radiation Oncology, Tom Baker Cancer Center, Calgary, AB, Canada (3) Department of Radiation Oncology, The Ottawa Hospital Cancer Program, University of Ottawa, Ottawa,Ontario, Canada (4) Department of Oncology, Division of Medical Physics, Tom Baker Cancer Centre, Calgary, AB, Canada
TH-BC-225BCD-9BEST IN PHYSICS (MULTI-DISCIPLINARY): Rapid Multi-Contrast Brain Imaging at 0.35T to Facilitate Tumor Response Assessment and Functional Adaptive Radiation Therapy
N. Zakariaei1*, Y. Chen2, S Nejad-Davarani 3, E.M. Haacke1,4, C Glide-Hurst1,3 (1) Wayne State University, Detroit, MI, (2) Wayne State University School of Medicine, Detroit, (3) Henry Ford Cancer Institute, Detroit, MI (4) The MRI Inst. for Biomedical Research, Detroit, MI
TH-BC-301-7Future High Precision Stereotactic Treatment Delivery: Is Penumbra a Concern?
B Kopchick1*, H Xu2 , C Yu3 , (1) George Washington University, Washington, DC, (2) University of Maryland School of Medicine, Columbia, MD, (3) University of Maryland School of Medicine, Baltimore, MD
TH-BC-303-3Clinical Introduction of 5DCT Simulation for Lung Cancer
M Lauria1*, D O'Connell1 , N Agazaryan2 , J Lewis2 , J Lamb1 , D Thomas3 , P Lee1 , D Low1 , (1) University of California, Los Angeles, Los Angeles, CA, (2) UCLA School of Medicine, Los Angeles, CA, (3) University of Colorado, Denver, CO
TH-BC-304-2A Simple Method to Estimate the System, Patient Size and Projection Specific Dose Conversion Coefficients for Coronary Angiography Procedures
S Wang*, B Peng , S Jambawalikar , Columbia University, New York, NY
TH-BC-304-3Fetal Dose Estimates for Tube Current Modulated (TCM) and Fixed Tube Current (FTC) Abdominal/Pelvic CT Examinations of Pregnant Patients
A Hardy1*, M Bostani1 , E Angel2 , C Cagnon1 , M McNitt-Gray1 , (1) UCLA, Los Angeles, CA, (2) Canon Medical Systems, Tustin, CA
TH-BC-304-4Modeling CT Scanner Complexities Using Deterministic Linear Boltzmann Transport Equation Solver for Patient-Specific CT Dose Estimation
S Principi1,2*, A Wang3 , A Maslowski4 , T Wareing4 , P Jordan4 , T Schmidt1,2 , (1) Medical College of Wisconsin, Milwaukee, WI, (2) Marquette University, Milwaukee, WI, (3) Stanford University, Stanford, CA, (4) Varian, Palo Alto, CA
TH-BC-304-5Multi-Organ Segmentation of CT Images Using Deep-Learning for Instant and Patient-Specific Dose Reporting
Z Peng1,2 , X Fang1 , H Shan1 , T Liu1 , X Pei2 , P Yan1 , G Wang1 , B Liu3 , M Kalra3 X G Xu1,2*, (1) Rensselaer Polytechnic Institute, (2) University of Science and Technology of China (3) Massachusetts General Hospital
TH-BC-304-7Direct Measurements of Dynamic Beam Collimation From Four Modern Wide-Beam CT Scanners
K Yang*, Z Li , X Li , B Liu , Massachusetts General Hospital, Boston, MA
TH-BC-SAN1-0Rationale and Evidence for SBRT
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-BC-SAN1-1Introduction
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-BC-SAN1-2Radiation Therapy Dose Response Modeling and Optimization of Fractionation Schedules with Cancer Stem Cells
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-BC-SAN1-3Role of Vascular Damage and Tumor Microenvironment in the Response of Tumors to SBRT and SRS
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-BC-SAN1-4Biological Dose Escalation and Outcomes Modeling in the Era of Stereotactic Radiotherapy
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-BC-SAN1-5Immunomodulatory Effects of Stereotactic Body Radiation Therapy (SBRT): Preclinical Insights and Clinical Opportunities
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-BC-SAN1-6Q&A
V Yu1*, C Song2*, D Carlson3*, A Marciscano4*, (1) UCLA School of Medicine, Los Angeles, CA, (2) University of Minnesota Medical School, Minneapolis, MN, (3) University of Pennsylvania, Philadelphia, PA, (4) Memorial Sloan Kettering Cancer Center, New York, NY
TH-C-SAN2-1Harmonizing Imaging Protocols: Impact On Radiomics Survival Prediction in Large Patient Cohorts
R Ger*, S Zhou , D Mackin , H Elhalawani , B Elgohari , J Meier , C Fuller , R Howell , R Layman , H Li , O Mawlawi , R Stafford , L Court , UT MD Anderson Cancer Center, Houston, TX
TH-D-302-11Interventional Radiology Radiation Safety Training Using Virtual Reality
Y Guo1 , L Mao2 , y li1 , Z gongsen1 , Y Gao3 , L Dauer3 , P Caracappa4 , S Balter5 , X Pei1 , Z Chen1 , X Xu1,2*, (1) University of Science and Technology of China, Hefei, 34, (2) rensselaer polytechnic institute, Troy, NY, (3) Memorial Sloan Kettering Cancer Center, New York, NY, (4) Virtual Phantoms, Inc., Albany, NY, (5) Columbia University Medical Center, New York, NY
TH-D-304-4Quantifying the Dosimetric Impact of Delineation Variability While Considering Patient Setup Variability
E Aliotta*, H Nourzadeh , J Siebers , University of Virginia Health System, Charlottesville, VA
TU-AB-221AB-13D X-Ray-Induced Acoustic Computed Tomography (3D XACT)
S Wang*, P Samant , E Robertson , H Liu , L Xiang , University of Oklahoma, Norman, OK
TU-AB-221AB-2An Integrated Mass Conservation Formulation for Robust Intensity-Based Computed Tomography (CT) Ventilation
E Castillo1*, Y Vinogradskiy2 , R Castillo3 , (1) Beaumont Health Research Institute, Houston, TX, (2) University of Colorado Denver, Aurora, CO, (3) Emory Univ, Atlanta, GA
TU-AB-221AB-4Design Study for Multi-Beam X-Ray Scatter Projection Imaging with Pre-Detector Vanes
C Dydula*, P C Johns, Carleton University, Ottawa, ON
TU-AB-221AB-5Disease Progression in Idiopathic Pulmonary Fibrosis: The Potential for Stratifying Patients Using Hyperpolarized Xenon-129 Magnetic Resonance Imaging
L Rankine1,2*, Z Wang2 , J Wang3 , M He2 , H McAdams2 , J Mammarappallil2 , C Rackley2 , B Driehuys2 , R Tighe2 , (1) The University of North Carolina at Chapel Hill, NC, (2) Duke University, Durham, NC, (3) The Ohio State University Wexner Medical Center, Columbus, OH
TU-AB-221AB-6Fluorescence Molecular Tomography/X-Ray Computed Tomography Dual-Modality Tumor Detection Using Active Targeting Nanoparticles and Effective Background Subtraction
J Shi*, T Udayakumar , N Dogan , A Pollack , Y Yang , University of Miami Miller School of Medicine, Miami, FL
TU-AB-221AB-9Transmission W-Diamond X-Ray Target for High Brightness Microfocus X-Ray Sources
Y Tan*, P Kandlakunta, R Liu, S Zhou, T Zhao and T Zhang, Washington University School of Medicine, St. Louis, MO
TU-AB-SAN1-6GEANT4 Simulations of 92Mo as a Range Verification Marker for Proton Radiotherapy
E Kasanda1*, C Burbadge1 , D Muecher1,2 , C Hoehr2 , V Bildstein1 , J Turko1 , B Olaizola Mampaso2 , (1) University of Guelph, Guelph, ON, (2) TRIUMF, Vancouver, BC
TU-AB-SAN2-7Development and Validation of Deep Learning Segmentation Network for Cardio-Pulmonary Substructure Segmentation
R Haq*, A Hotca-Cho , A Apte , A Rimner , J Deasy , M Thor , Memorial Sloan Kettering Cancer Center, New York, NY
TU-AB-SAN2-12Identifying Oropharyngeal Clinical Target Volumes Delineation Patterns From Peer-Reviewed Clinical Delineations Via Cascade 3D Fully-Convolutional Networks
C Cardenas1*, J Yang1 , A Mohamed1 , C Fuller1 , B Beadle2 , A Garden1 , L Court1 , (1) University of Texas MD Anderson Cancer Center, Houston, TX, (2) Stanford University, Stanford, CA
TU-B-301-0In Memoriam of Jean St. Germain: The Intersection of Radiobiology, Radioepidemiology, and Safety
L Rothenberg1*, E Yorke2*, J Bernstein3*, G Kim4*, (1) Memorial Sloan-Kettering Cancer Center, New York, NY, (2) Memorial Sloan-Kettering Cancer Center, New York, NY, (3) Memorial Sloan Kettering Cancer, New York, NY, (4) University of California, San Diego, La Jolla, CA
TU-B-301-1Memorial Symposia Introduction
L Rothenberg1*, E Yorke2*, J Bernstein3*, G Kim4*, (1) Memorial Sloan-Kettering Cancer Center, New York, NY, (2) Memorial Sloan-Kettering Cancer Center, New York, NY, (3) Memorial Sloan Kettering Cancer, New York, NY, (4) University of California, San Diego, La Jolla, CA
TU-B-301-2Radiobiology - Biological Effects, Therapeutic Ratio, and Hypofractionated RT
L Rothenberg1*, E Yorke2*, J Bernstein3*, G Kim4*, (1) Memorial Sloan-Kettering Cancer Center, New York, NY, (2) Memorial Sloan-Kettering Cancer Center, New York, NY, (3) Memorial Sloan Kettering Cancer, New York, NY, (4) University of California, San Diego, La Jolla, CA
TU-B-301-3Radioepidemiology - Genetics, Family History, and Environment - Update From the WECARE Breast Cancer Epidemiology Study
L Rothenberg1*, E Yorke2*, J Bernstein3*, G Kim4*, (1) Memorial Sloan-Kettering Cancer Center, New York, NY, (2) Memorial Sloan-Kettering Cancer Center, New York, NY, (3) Memorial Sloan Kettering Cancer, New York, NY, (4) University of California, San Diego, La Jolla, CA
TU-B-301-4Safety - Prevention of Errors in Radiation Oncology: Current Strengths and Opportunities
L Rothenberg1*, E Yorke2*, J Bernstein3*, G Kim4*, (1) Memorial Sloan-Kettering Cancer Center, New York, NY, (2) Memorial Sloan-Kettering Cancer Center, New York, NY, (3) Memorial Sloan Kettering Cancer, New York, NY, (4) University of California, San Diego, La Jolla, CA
TU-C-PinS-3Rotation Corrected Setup Margin Calculation for Stereotactic Body Radiation Therapy in Dual Imaging Environment
B Sarkar1*,T Ganesh2 ,A Manikandan 3 ,S Krishnankutty4 , L Chitral5 , A Munshi6 , BK Mohanti7 , (1) AMRI Cancer Centre, Kolkata, ,(2)Apollo protan centre ,Chennai, ,(3) Manipal Hospitals, Gurugram, ,(4) Manipal Hospitals, New Delhi, ,(5) Manipal Hospitals Dwarka, New Delhi, DL, (6) Manipal Hospitals, New Delhi, ,(7) Manipal Hospitals, New Delhi,
TU-C-PinS-5Evaluation of the Rotational Alignment Accuracy and Error Using 3D/3D, 2D/3D and 3D Surface Registration
H Kuo*, A Ballangrud , G Li , D Lovelock , B Wolthuis , C Della-Biancia , S Berry , M Hunt , Memorial Sloan Kettering Cancer Center, New York, NY
TU-C1000-GePD-F2-3Generating Pseudo-CT for MRI-Only RT Using T1-Weighted and T2-Weighted MRI Images
S Leu1*, Z Lin1 , Z Huang2 , (1) East Carolina University, Greenville, NC, (2) Saint Thomas Hospital, Brentwood, TN
TU-C1000-GePD-F4-4Characterization of a Two-Dimensional Diode Detector Array for Use in Patient Specific, Pre-Treatment QA of Stereotactic Plans
D Wieczorek*, V Mishra , T Poozhikala , A Gutierrez , Miami Cancer Institute, Miami, FL
TU-C1000-GePD-F5-6Uncertainties of Bladder Cancer Radiation Treatment with CT-On-Rails Localization
T Lin*, C Ma , Fox Chase Cancer Center, Philadelphia, PA
TU-C1000-GePD-F6-6Machine Learning Based Method for Peer Review Rounds Case Prioritization
L Conroy*, C McIntosh , T Purdie , The Princess Margaret Cancer Centre - UHN, Toronto, ON
TU-C1030-GePD-F2-4PDFF Quantification for the Assessment of Red Bone Marrow During RT
M Bydder1 , Y Yang2*, Y Gao1 , F Ali1 , M. Steinberg2 , D Low2 , P Hu1 , (1) UCLA, Radiology, Los Angeles, CA, (2) UCLA, Radiation Oncology, Los Angeles,
TU-C1030-GePD-F3-5Evaluation of Intrafraction Motion During Spine Stereotactic Body Radiotherapy Using Pre and Post Treatment Cone Beam Computed Tomography
A Magnelli*, P Qi , S Balik , T Zhuang , S Chao , J Suh , P Xia , The Cleveland Clinic Foundation, Cleveland, OH
TU-C1030-GePD-F5-5Verification of Target Volume Margin of Visual-Guided Breath-Hold Method in Stereotactic Body Radiotherapy for Liver Cancer
M Cho1,2*, H Kim1 , S Yoon 1, J Jung1 , S Lee1, J Kwak1 , K Yoon1 , C Jeong1 , M Park1 , H Kim1 , S KIM1 , B Cho1,2 ,(1) Department of Radiation Oncology, Asan Medical Center, Seoul, (2) University of Ulsan, College of Medicine
TU-C1030-GePD-F6-1A Methodology for Computer-Aided Diagnosis of Thyroid Lesions Based On Computed Tomography Images
C Liu*, Y Yang , D Shao , W Peng , Y Wang , Y Wang , Cancer Institute Hospital, CAMS, Warren, NJ
TU-C1030-GePD-F7-2Assessment of Positional Reproducibility of Two Types of Commercially Available Endorectal Balloons From RadiaDyne Used Clinically for the Treatment of Prostate Cancer Patients
J George*, J Bennouna , S George , U Ramos , A Gutierrez , Miami Cancer Institute, Miami, FL
TU-C1030-GePD-F7-5Open Source Software for TG-263 Compliance
R Cardan1*, R Popple2 , E Covington3 , (1) UAB University of Alabama, Birmingham, Hoover, AL, (2) Univ Alabama Birmingham, Birmingham, AL, (3) University of Alabama-Birmingham, Birmingham, AL
TU-C1030-GePD-F9-3Convolutional Network Based Motion Artifact Reduction in Cone-Beam CT
P Paysan1*, A Strzelecki1, F Arrate2, P Munro1, S Scheib1, (1) Varian Medical Systems Imaging Laboratory, Daettwil AG,(2) Varian Medical Systems, Palo Alto, CA
TU-C1030-GePD-F9-5Intrinsic Measurement of Cardiorespiratory Signals of Centrally-Located Tumour Motion From Thoracic Cone-Beam CT
S J Blake*, N Hindley, C-C Shieh, P Keall, R O'Brien, ACRF Image-X Institute, University of Sydney, Sydney, NSW, Australia
TU-C1030-GePD-F9-6What Image Features Are Good for Correlation-Based Tracking Algorithms Used for Soft Tissue Monitoring in X-Ray Imaging
A Jeung*, L Zhu , H Mostafavi , J van Heteren , Varian Medical Systems, Palo Alto, CA
TU-C930-GePD-F3-1Validation of a Laying Down Technique for Total Skin Irradiation Using Monte Carlo
R Li*, Q Wu , Duke University, Durham, NC
TU-C930-GePD-F3-2CT-Less Electron Radiotherapy with a Consumer Stereo Depth Camera
L Skinner1*, Y Wang1, A Yu1, (1) Stanford University Cancer Center, Stanford, CA.
TU-C930-GePD-F4-1Evaluation of a Plastic Scintillation Detector for Commissioning Data Acquisition in An MR-Guided Linear Accelerator
B Barraclough*, K Mittauer , D Jacqmin , A Antolak , P Yadav , University of Wisconsin, Madison, WI
TU-C930-GePD-F6-1Generalized Image Quality Analysis for Nonlinear Algorithms in CT
G Gang*, X Guo , J Stayman , Johns Hopkins University, Baltimore, MD
TU-C930-GePD-F6-3Standardizing Patient Orientation to Improve Generalization of Radiomics Models
A Iyer*, J Oh , M Thor , J Deasy , A Apte , Memorial Sloan Kettering Cancer Center, New York, NY
TU-C930-GePD-F6-4The Stability of CT Radiomics Feature Using Repeated Scans
C Ma1*, (1) Rutgers Cancer Institute of New Jersey
TU-C930-GePD-F6-6Understanding the Impact of Heterogeneous Iterative Reconstruction and Dose Conditions in Low-Dose CT Computer-Aided Detection of Lung Nodules
M Wahi-Anwar*, N Emaminejad , G Kim , M McNitt-Gray , M Brown , David Geffen School of Medicine at UCLA, Los Angeles, CA
TU-C930-GePD-F7-2Fitting NTCP Models and Dose-Volume Metrics to Patient Reported Dysphagia 12 Months After Radiotherapy for Oropharyngeal Cancer
B Chera1*, D Fried2 , A Kubli3 , J Weng4 , R Amdur5 , W Mendenhall6 , N Sheets7 , R Green8 , L Marks9 , S Das10 , P Mavroidis11 , (1) UNC at Chapel Hill, Morrisville, NC, (2) UNC Health Care, Chapel Hill, NC, (3) Thomas Jefferson University Hospital, Philadelphia, PA, (4) Duke University, Durham, NC, (5) University of Florida Hospitals, Gainesville, FL, (6) University of Florida, Gainesville, FL, (7) UNC Health Care, Chapel Hill, NC, (8) UNC at Chapel Hill, Morrisville, NC, (9) University of North Carolina, Chapel Hill, NC, (10) Univ North Carolina, Chapel Hill, NC, (11) Univ North Carolina, Chapel Hill, NC
TU-C930-GePD-F7-3External Validation of 3D Spatial Dose-Response Mapping for Toxicity Subsequent to Pelvic Radiotherapy
M Marcello1 , A Kennedy2 , A Haworth3 , L Holloway4,5,6 , J Dowling7,8 , P Greer8,9 , S Gulliford10,11 , D Dearnaley11 , M Sydes12 , E Hall11 , J Denham8,9 , M Ebert1,2*, (1) University Of Western Australia, Perth, Australia,(2) Sir Charles Gairdner Hospital, Perth, Australia,(3) University of Sydney, Camperdown, NSW, Australia, (4) Liverpool Hospital, Sydney, Australia,(5) University of New South Wales, Sydney, Australia,(6) University of Wollongong, Wollongong, ,(7) CSIRO, Brisbane, Australia,(8) University of Newcastle, Newcastle, Australia,(9) Calvary Mater Newcastle, Newcastle, Australia,(10) University College London Hospital, London, London, United Kingdom, (11) Institute for Cancer Research, Sutton, United Kingdom, (12) University College London, London, United Kingdom,
TU-C930-GePD-F7-5Incorporating Tumor Size-Adjusted BED Model Into Eclipse TPS: Prospectively Predicting Local Control Rates of Lung SBRT Patients
Z Pearson*, E Johnson , J Molloy , R McGarry , M Randall , D Pokhrel , Univ Kentucky Medical Ctr, Lexington, KY
TU-C930-GePD-F8-6Impact of Kernel Truncation On 177Lu-DOTATATE and 131I-MIBG Voxelwise Dosimetry
S Graves*, A Tiwari , D Hyer , R Flynn , J Buatti , J Sunderland , University of Iowa, Iowa City, IA
TU-C930-GePD-F9-1Automatic Segmentation On CBCT Images Using a Combination of CBCT Enhancement and Deep Learning CT Segmentation
S Andersson*, R Nilsson, RaySearch Laboratories AB, Stockholm
TU-C930-GePD-F9-2Calibrator Recognition of Cone-Beam Image for Geometric Correction
Q Ling1*, X Duan2 , J Ma3 , J Huang4 , S Huang5 , J Cai6 , L Zhou7 , Y Xu8 ,(3) UT Southwestern Medical Center, Dallas, TX, (1-2,4-8) Southern Medical University,Guangzhou
TU-C930-GePD-F9-4Hounsfield Unit Correction of Prostate CBCT Using Cycle-Consistent Generative Adversarial Networks (CycleGAN)
O Dona*, Y Wang , A Xu , C Wuu , Columbia Univ, New York, NY
TU-C930-GePD-F9-5Transfer Learning of a Convolutional Neural Network for CBCT Projection-Domain Scatter Correction with Different Scan Conditions
Y Nomura1*, Q Xu2,3 , H Shirato2,4 , S Shimizu2,5 , L Xing2,6 , (1) Department of Radiation Oncology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan, (2) Global Station for Quantum Medical Science and Engineering, Global Institution for Collaborative Research and Education (GI-CoRE), Hokkaido University, Sapporo, Japan, (3) Beijing Engineering Research Center of Radiographic Techniques and Equipment, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China, (4) Department of Radiation Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan, (5) Department of Radiation Medical Science and Engineering, Faculty of Medicine, Hokkaido University, Sapporo, Japan, (6) Department of Radiation Oncology, Stanford University, Stanford, CA
TU-E-221CD-0Radiation Protection for Fluoroscopically-Guided Interventional Procedures: Patient Dose and Radiobiology
K Wunderle1*, R Stewart2*, K Wunderle3*, (1) Cleveland Clinic Foundation, Broadview Hts, OH, (2) University of Washington, Seattle, WA, (3) Cleveland Clinic Foundation, Broadview Hts, OH
TU-E-SAN1-2Radiation Related Lymphopenia for the Treatment of Pancreatic Cancer: Measurement Derived Data for the Development of a Robust Simulation
J Sanders1 , T Jones1 , D Liyanage2 , M Conaway1 , M Peach1 , E Janowski1 , K Wijesooriya1*, (1) University of Virginia, Charlottesville, VA,(2) Albemarle High School, Charlottesville, VA
TU-E-SAN1-6The Predictive Value of Tc-99m MAA SPECT/CT for Voxel-Based Tumor Dosimetry of Yttrium-90 Microsphere Therapy
P Potrebko*, G Andl , S Bose , T Fox , Varian Medical Systems, Atlanta, GA
TU-E-SAN2-6Standardizing Structure Labels in Head-And-Neck Region Using Non-Local 3D-ResNet
Q Yang1,2*, T Rozario1, A Barragan Montero1, M Joo1, R McBeth1, H Chao1,2, S Jiang1, (1) Medical Artificial Intelligence and Automation (MAIA) Laboratory, Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas, USA, (2) School of Data and Computer Science, Sun Yat-sen University, Guangzhou, Guangdong, P.R.China
TU-E-SAN2-7Modified U-Net for High-Resolution High-Level Feature Extraction and Its Application to Liver-Tumor Segmentation
H Seo1*, C Huang2 , L Xing1 , (1) Stanford Univ School of Medicine, Stanford, CA, (2) Stanford Univ School of Engineering and Medicine, Stanford, CA
TU-F115-GePD-F1-2Initial Experience with MIM SurePlan for Y-90 Treatment Planning
M Studenski*, N Patel , B Spieler , R Llorente , H Giap , L Portelance , University of Miami, Miami, FL
TU-F115-GePD-F2-5Radiation Dose Response Model for Ventilation Change Using All Phases of 4DCT
E Wallat1*, M Flakus1 , A Wuschner1 , W Shao2 , S Gerard2 , T Patton3 , G Christensen2 , J Reinhardt2 , A Baschnagel1 , J Bayouth1 , (1) University of Wisconsin-Madison, Madison, WI, (2) University of Iowa, Iowa City, IA,(3) University of Denver, Denver, CO
TU-F115-GePD-F3-1Sub-Image Sampling Method to Improve Temporal Resolution of Time-Resolved EPID Applications
C Cassell1*, D Lee1 , P Greer1,2 , (1) School of Mathematical and Physical Sciences, University of Newcastle, Callaghan, NSW, Australia (2) Radiation Oncology, Calvary Mater Newcastle Hospital, Newcastle, NSW, Australia
TU-F115-GePD-F3-4EPID-Based Three-Dimensional Dose Reconstruction Method
H Zheng*, J Zhao , M Cheng , J Jia , J Song , G Song , T He , Y Wu , Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei, Anhui, 230031, China; Anhui Radiotherapy Engineering Technology Research Center, Hefei, Anhui, 230031, China;
TU-F115-GePD-F5-2Commissioning Varians SmartAdapt for Clinical Applications in Adaptive Radiation Therapy
J Vickress1,2*, H Afsharpour1 , A Rangel1 , (1) Carlo Fidani Peel Regional Cancer Centre, Trillium Health Partners, Mississauga, ON, (2) Department of Radiation Oncology, University of Toronto, Toronto, CA
TU-F115-GePD-F5-4Cone-Beam CT Simulation for Same-Day VMAT Treatment of Bony Metastases
R Zakariaee1,2*, D Comsa2 , D Moseley1,2,3 , (1) Department of Radiation Oncology, University of Toronto, Toronto, ON, (2) Radiation Medicine Program, Stronach Regional Cancer Centre, Newmarket, ON, (3) Radiation Medicine Program, Princess Margaret Hospital, Toronto, ON
TU-F115-GePD-F6-1Clinical Evaluation and Implementation of a Commercial Iterative CBCT Algorithm
Y Zheng*, J Wong , Atlantic Health System, Morristown, NJ
TU-F115-GePD-F6-2Imaging Quality of Intrafraction 4D CBCT for Lung SBRT Using Flattening Filter-Free Beams: A Phantom Study
J Kim*, J Kim , K Keum , H Lee ,
TU-F115-GePD-F6-4Dependence of Radiomics Features On CT Image Acquisition and Reconstruction Parameters Using a Cadaveric Human Liver
I Gertsenshteyn1*, J Foy1 , A Crofton2 , V Grekoski3 , T Tran3 , K Guruvadoo3 , H Al-Hallaq1 , S Armato1 , W Sensakovic3 , (1) The University of Chicago, Chicago, IL, (2) Adventist University of Health Sciences, Orlando, FL, (3) Florida Hospital, Orlando, FL
TU-F115-GePD-F6-6Evaluation of Metal Artifacts and Dosimeteric Deviations with Multiple Energy CT Imaging
N Alsbou1*, S Ahmad2 , I Ali2 , (1) Department of Engineering and Physics, University of Central Oklahoma, Edmond, OK, (2) University of Oklahoma Health Sciences Center, Oklahoma City, OK,
TU-F115-GePD-F7-5Development of a Geometric Tool for Patient-Specific, Contour Based VMAT Collimator Optimization
J Kilian-Meneghin*, L Kumaraswamy, Roswell Park Cancer Institute, University at Buffalo, Buffalo, NY
TU-F115-GePD-F7-6Knowledge-Based Prediction of Plan Quality Metrics in Intracranial Stereotactic Treatment Planning
S Yu*, H Zhen , X Zhang , U Langner , M Dyer , M Truong , Boston University School of Medicine, Boston, MA
TU-F115-GePD-F9-2Comparing Profile-Based KV Assist On Revolution Apex to Previous Generation of KV Assist On Revolution CT
F Rupcich1*, H Litt2 , (1) GE Healthcare, Waukesha, WI, (2) Perelman School of Medicine of the University of Pennsylvania, Philadelphia, PA
TU-F115-GePD-F9-3Fat Fraction Based Segmentation of CT Image Based On Surfactant-Free Microemulsion Reference Phantom: A Feasibility Study
H Cho1, C Lee1 , B Ahn1 , C Hong2* , (1) Korea Research Institute of Standards and Science,Daejeon, Korea (2) Daegu Catholic University, Daegu,Korea
TU-F115-GePD-F9-4Human Visual Properties Based Grayscale Contrast Enhancement
W Zhou1*, Y Tian1 , (1) Shanghai Siemens Medical Equipment Ltd, Shanghai,
TU-F115-GePD-F9-5Spatial and Temporal Analysis of Iodine Uptake in the Lungs of a Swine Model
M Lawless*, J Miller , J Huang , K Mittauer , A Wuschner , M Flakus , J Meudt , D Shanmuganayagam , J Bayouth , University of Wisconsin-Madison, Madison, WI
TU-F115-GePD-F9-6Validation of Low Dose CT Perfusion Using Projection View Sharing On a CT Perfusion Phantom
T Martin1,2*, K Wang3 , I Bechwati3 , D Wang2,3 , (1) University of Texas Health Science Center at San Antonio, San Antonio, TX, (2) Hura Imagin, LLC, (3) Univ Southern California, Los Angeles, CA, (4) NeuroLogica Corporation, Danvers, MA
TU-G-TOUR-I-0Brain CT Perfusion
K Little*, Ohio State University, Columbus, OH
TU-HI-SAN1-10Real-Time Online Adaptive Fully Automated Radiation Treatment Re-Planning in Lung Cancer
R A Cormack*, R H Mak , C V Guthier, Department of Radiation Oncology, Brigham and Women's Hospital and Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA
TU-HI-SAN2-1A Novel Semantic CT Segmentation Algorithm Using Boosted Attention-Aware Convolutional Neural Networks
V Kearney*, J Chan , T Wang , A Perry , S Yom , T Solberg , UCSF Comprehensive Cancer Center, San Francisco, CA
TU-HI-SAN2-6Delta-Radiomics and Tumor Characteristic Factors as a Combined Biomarker for Chemoradiation Therapy of Locally Advanced Pancreatic Cancer
H Nasief1*, W Hall2 , C Zheng3 , S Tsai4 , L Wang5 , B Erickson6 , X Li7 , (1) Medical College of Wisconsin, Marshall, WI, (2) Medical College of Wisconsin, Milwaukee, WI, (3) University of Wisconsin Milwaukee, Milwaukee, WI, (4) Medical College of Wisconsin, Milwaukee, WI, (5) Medical College of Wisconsin, Milwaukee, WI, (6) Medical College of Wisconsin, Milwaukee, WI, (7) Medical College of Wisconsin, Milwaukee, WI
TU-HI-SAN2-12Sub-Region Based Radiomics Analysis for Survival Prediction in Esophageal Tumors Treated by Radiotherapy
P Yang1*, L Xu1 , Z Cao1 , Y Jiang1 , Y Xue1 , C Luo1 , S Wu2 ,Y Kuang3 , T Niu1 , (1) Zhejiang University, Hangzhou, Zhejiang, Peoples R China,(2) Hangzhou Cancer Hospital, Hangzhou, Zhejiang, Peoples R China,(3) University of Nevada, Las Vegas, Las Vegas, NV
TU-HI-SAN4-3Effect of Tissue Optical Properties On Cherenkov Intensity to Dose Conversion Factor in TSE Patients
T Zhu1*, Y Ong1 , H Petroccia1 , T Miao2 , Y Zhu1 , B Pogue2 , (1) Univ Pennsylvania, Philadelphia, PA, (2) Dartmouth College, Hanover, NH,
TU-HI-SAN4-5Development of a Gantry-Resolved EPID-Based Frame-By-Frame Patient-Specific VMAT QA Method
P Cardoso1*, Q Wu2 , B Liang3 , R Wei3 , (1) Duke Kunshan University, Kunshan, China, (2) Duke University Medical Center, Durham, NC, (3) Image Processing Center, Beihang University, Beijing, China
TU-HI-SAN4-10Time Reversal-Based Protoacoustic Reconstruction for Range and Dose Verification in Proton Therapy
Y Yu1 , D Zhang1 , L Xing2 , H Peng1*, (1) Wuhan University, Wuhan, (2) Stanford University School of Medicine, Stanford, CA
TU-J345-GePD-F1-1Evaluation of the Dosimetric Benefit of Using Cyberknife for Stereotactic Radiotherapy (SBRT) of Prostate Treatment
L Wang*, S Hayes , E Horwitz , L Jin , C Ma , Fox Chase Cancer Center, Philadelphia, PA
TU-J345-GePD-F1-4Investigation On Imaging Dose to Spinal Cord in Spine SBRT Treatment
Y Xu1,2*, M Khosravi2 , Y Lyatskaya2 , P Zygmanski2 , F Hacker2 , J Bredfeldt2 , Y Hu2 , (1) Harvard Medical School (2) Brigham & Women's Hospital, Boston, MA
TU-J345-GePD-F2-1Evaluation of Factors That Affect 4D Cone Beam CT-Ventilation Images for Adaptive Functional Avoidance Radiotherapy
H Nemoto1*, N Kadoya1 , T Kajikawa1 , Y Nakajima2 , T Kanai3 , Y Ieko3 , K Takeda4 , K Jingu1 , (1)Department of Radiation Oncology, Tohoku University Graduate School of Medicine, Sendal, Japan,(2)Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, ,(3) Yamagata University Faculty of Medicine, Yamagata, Japan,(4) Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, Sendai, Japan,
TU-J345-GePD-F3-1Beam Quality Conversion Factor of a MicroDiamond Detector in Flattened and Un-Flattened High-Energy Photon Beams
T Saitou*1,2, K Hirayama1,2,3, M Shimizu2, Y Morishita2, K Okudaira4, T Kamomae5, H Oguchi5, M Sato1, M Hoshina1, (1) Komazawa University, Setagaya, Tokyo, (2) National Metrology Institute of Japan, Tsukuba, Ibaraki, (3) National Cancer Center Hospital East, Kashiwa, Chiba, (4) Nagoya University Hospital, Nagoya, Aichi, (5) Nagoya University Graduate School of Medicine, Nagoya, Aichi
TU-J345-GePD-F6-1Correlation of Deformation Vector Field Error and Contour-Based Metrics in Unimodal Deformable Image Registration
L Shi1*, S Barley2 , S Benedict3 , J Qiu1 , Y Rong3 , (1) Taishan Medical University, Taian, ,(2) Oncology Systems Limited (OSL), Shrewsbury, ,(3) UC Davis Cancer Center, Sacramento, CA
TU-J345-GePD-F6-2Head and Neck MR-CT Registration Using Deep Learning Derived Synthetic CT
E McKenzie1*, D Ruan1 , D O'Connor2 , M Cao1 , A Santhanam1 , K Sheng1 , (1) UCLA, Los Angeles, CA, (2) University of San Francisco, San Francisco
TU-J345-GePD-F6-4New Approach for Automatic and Patient-Specific Evaluation of Multi-Modality Deformable Image Registration Accuracy as Tested On Halcyon's Megavoltage Cone Beam CT System
Y Huang*, Y Zhang** , Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital & Institute, Beijing, 100142 **Corresponding Author:Y Zhang email:zhangyibao@pku.edu.cn
TU-J345-GePD-F8-2Detection and Classification of Artifacts in Structural Brain MR Images Using Deep Convolutional Neural Networks
S Sujit*, R Gabr , I Coronado , P Narayana , University of Texas Health Science Center at Houston, Houston, TX
TU-J345-GePD-F8-4High Performance Gradient On a Compact 3T MR Scanner for Functional MRI Geometrical Distortion Reduction: Preliminary Experience and Comparison with Conventional Whole-Body 3T Scanner
D Kang1*, M In1 , H Jo1 , Ek Tan2, U Yarach1 , N Meyer1 , J Trzasko1 , J Huston1 , T Foo2 , M Bernstein1 , Y Shu1 , (1) Mayo Clinic, Rochester, MN, (2) GE Global Research, Niskayuna, NY
TU-J345-GePD-F9-1Bias in Dual-Energy CT Material Decomposition Caused by Photon Starvation
X Jiang*, X Yang , D Hintenlang , R White, Dept of Radiology, Ohio State Univ, Columbus, OH
TU-J345-GePD-F9-2Characterizing the Impact of Beam Hardening Conditions On Iodine Maps and Virtual Non-Contrast Images On a Dual Energy CT Scanner
C Olguin*, S Leon , I Barreto , University of Florida, Gainesville, FL
TU-J345-GePD-F9-3Improving Delineation Using Simultaneous Dual-Energy CT for Radiation Therapy Planning of Pancreatic Cancer
G Noid*, D Schott , A Tai , D Prah , E Paulson , X Li , Medical College of Wisconsin, Milwaukee, WI
TU-J345-GePD-F9-4Longitudinal Variation and Correlation of Spectral CT Measurements Using An ACR CT Phantom
X Duan*, Y Zhang , J Guild , J Anderson , UT Southwestern Medical Ctr at Dallas, Dallas, TX
TU-J345-GePD-F9-5Optimization of Calcium Inserts for Quality Assurance of Calcium Removal in Dual Energy Computed Tomography
M Lawless1*, L Di Maso1 , J Huang1 , K Ruchala4 , J Miller1 , (1) University of Wisconsin-Madison, Madison, WI, (4) GAMMEX Inc., Madison, WI
TU-J345-GePD-F9-6Virtual Monochromatic Analysis in Spectral CT for Differentiation of Soft Tissues: Potentials and Challenges
X Tang1*, W Long1 , H Xie1 , Y Ren2 , (1) Emory University School of Medicine, Atlanta, GA, (2) Sinovision Technologies, Beijing,
TU-K430-CAMPUS-F3-2Clinical Validation of Photon Optimizer (PO) Algorithm Against Progressive Resolution Optimizer (PRO) in the Treatment of Single-Dose Lung SBRT
J Visak*, J Molloy , M Randall , R McGarry , D Pokhrel , University of Kentucky, Lexington, KY
TU-K430-CAMPUS-F3-5Selection of Single Isocenter for Multi-Target Brain Treatment to Minimize Total Margin
JM Slagowski*, Z Wen , University of Texas MD Anderson Cancer Center, Houston, TX
TU-L-225BCD-2A Dual-Reconstruction Method to Generate Motion Artifact-Free CBCT Images
H Zhong*, X Li , Medical College of Wisconsin, Milwaukee, WI
TU-L-225BCD-7Reconstruction-Aware Sinogram Denoising with Deep U-Net for Low Dose CT
M Tsai12*, C Shen1 , X Jia1 , (1) University of Texas Southwestern Medical Center, Dallas, TX, (2) National Taiwan University, Taipei, Taiwan
TU-L-225BCD-8The Impact of Computed Tomography (CT) Reconstruction Kernels On Radiotherapy Treatment Planning Dose Calculation
I Vergalasova1 , M McKenna2 , N Yue1 , M Reyhan1*, (1) Rutgers University, New Brunswick, NJ, (2) Cancer Institute of New Jersey, Hamilton, NJ
TU-L-225BCD-9Dynamic MRI Reconstruction Using Simultaneous K-Space-Driven Motion Estimation and Compensation (SK-MEC)
Y Zhang1*, Z Iqbal1 , C Shen1 , C Wang2 , S Jiang1 , J Wang1 , (1) UT Southwestern Medical Ctr at Dallas, Dallas, TX, (2) Duke University Medical Center, Durham, NC
TU-L-304-2Cone-Beam CT of Load-Bearing Surgical Hardware Using a Mechanical Model of Implant Deformation
Q Cao*, S Liu , G Osgood , S Demehri , J Siewerdsen , J Stayman , W Zbijewski , Johns Hopkins University, Baltimore, MD
TU-L-304-3A Novel Contrast CT Based Quantitative Characterization of Surgical Resectability in Pancreatic Cancer
Y Lao1*, J David2 , Z Fan2 , K Sheng1 , A Shiu3 , E Chang3 , R Tuli4 , W Yang3 , (1) UCLA School of Medicine, Los Angeles, CA, (2) Cedars Sinai Medical Center, Los Angeles, CA, (3) University of Southern California, Los Angeles, CA, (4) MSKCC,New York, NY
TU-L-304-6Understanding Reproducibility of Radiomic Features of Lung Nodules Under Heterogenous CT Acquisition and Reconstruction Conditions
N Emaminejad*, M Wahi-Anwar , G Kim , M Brown , M McNitt-Gray , David Geffen School of Medicine at UCLA, Los Angeles, CA
WE-AB-221AB-2Task-Based Spectral Optimization On Twin-Beam Dual-Energy CT: A Simulation Study
L Ren*, S Tao , C McCollough , L Yu , Mayo Clinic, Rochester, MN
WE-AB-221AB-3Multi-Energy CT Using a Dual-Source Photon Counting Detector CT: Spectral and Dose Partition Optimization for Iodine Quantification
S Tao*, L Ren , K Rajendran , C McCollough , S Leng , Mayo Clinic, Rochester, MN
WE-AB-221AB-4Assessing Lung Function Using Contrast Enhanced Dynamic 4D CT and Split Filter Dual Energy CT for Radiation Therapy Applications
J Miller*, M Lawless , K Mittauer , A Wuschner , M Flakus , D Shanmuganayagam , J Meudt , J Huang , J Bayouth , University of Wisconsin, Madison, WI
WE-AB-221AB-5Dual-Energy CT Ventilation & Perfusion Imaging as An Accessible Alternative to Nuclear Medicine Techniques
J Korte* , N Bucknell , S Siva , B Woon , P Jackson , T Mulcahy , J Callahan , T Kron , N Hardcastle , Peter MacCallum Cancer Centre, Melbourne, Australia
WE-AB-221AB-6Noise Suppression in Image-Domain Multi-Material Decomposition for Dual-Energy CT
Y Jiang*, Y Xue , P Yang , L Xu , C Luo , C Yang , T Niu , Zhejiang University, Hangzhou, Zhejiang, Peoples R China
WE-AB-221AB-7Noise Subtraction for Dual Energy CT Images Using A Deep Convolutional Neural Network
A Missert*, L Yu , S Leng , C McCollough , Mayo Clinic, Rochester, MN
WE-AB-221AB-8Investigating the Use of Size Specific Calibrations to Perform Non Iodine Material Decomposition in Commercial Dual Energy CT Software
J Miller*, L DiMaso , J Huang , M Lawless , Univ of Wisc Madison, Madison, WI
WE-AB-221AB-9Low Dose Ultra-High Resolution Sinus Imaging Using Photon-Counting Detector CT with Tin Filter
K Rajendran*, W Zhou , S Tao , B Voss , M Bruesewitz , J Weaver , D DeLone , J Fletcher , C McCollough , S Leng , Mayo Clinic, Rochester, MN
WE-AB-221AB-10Coincidence Bins for Improving the Spectral Performance of Photon Counting Detectors
S Hsieh1*, (1) Department of Radiological Sciences, University of California Los Angeles, Los Angeles, California
WE-AB-225BCD-3A Composite Deep Learning Architecture for the Joint Prediction of Local Control and Radiation Pneumonitis in Radiotherapy for Non-Small Cell Lung Cancer Patients
S Cui*, Y Luo , H Tseng , R Ten Haken , I El Naqa , University of Michigan, Ann Arbor, MI
WE-AB-225BCD-6Intra-Treatment 18F-FDG PET/CT Radiomic Signature Predicts In-Field Recurrence Following Definitive Chemo-Radiation Therapy for Oropharyngeal Cancer
K Lafata*, Y Chang , C Wang , Y Mowery , D Brizel , F Yin , Duke University Medical Center, Durham, NC
WE-AB-303-7Evaluation of Off-Axis Spatial Accuracy Using An Integrated Quality Assurance Phantom for Frameless Single-Isocenter Multitarget Stereotactic Radiosurgery
D Capaldi1*, L Skinner1 , P Dubrowski1 , A Yu1 , (1) Stanford University Cancer Center, Stanford, CA
WE-AB-303-12Three-Dimensional Winston-Lutz Test Using a Reusable Radiochromic Gel Dosimeter
K Ono1*, K Fujino1 , K Kinoshita1 , S Hayashi2 , Y Akagi1 , Y Hirokawa1 , (1) Hiroshima Heiwa Clinic, Hiroshima, JP, (2) Hiroshima International University, Hiroshima, JP
WE-B-SAN2-6Commissioning of TLD Micro-Cubes for a Remote SRS Audit Program
B Luckett*, P Alvarez , P Taylor , S Kry , C Peterson , D Luo , D Followill , UT MD Anderson Cancer Center, Houston, TX
WE-C1000-GePD-F1-2Dosimetric Comparison of Several Radiotherapy Techniques in the Treatment of Scalp Cancer
D Schulze*, H Zhang , Northwestern Memorial Hospital, Chicago, IL
WE-C1000-GePD-F2-5Segmentation of Organs at Risk in Nasopharyngeal Cancer for Radiotherapy Using A Nested U-Net Architecture
Fan SONG1,2*, Sihua WU1,3, Sijuan Huang1, Yunfei XIA1, Xin Yang1. (1) Sun Yat-sen University Cancer Center; State Key Laboratory of Oncology in South China; Collaborative Innovation Center for Cancer Medicine; Guangdong Key Laboratory of Nasopharyngeal Carcinoma Diagnosis and Therapy, Guangzhou, Guangdong, 510060, China. (2) Guangdong University of Technology, Guangzhou, Guangdong, 511400, China. (3) Xinhua College of Sun Yat-sen University, Guangzhou, Guangdong, 510520,China.
WE-C1000-GePD-F3-4Fast and Automatic QA System for Cobalt Based Stereotactic Radiotherapy Machine: Collimator Verification and Isocenter Check
H Yan1*, X Li2 , T Gou1 , J Li1 , C Deng1 , C Ma3, J Li1 , (1)OUR United Corporation, Xi"an, China,(2) Tsinghua University, Beijing, China,(3)Fox Chase Cancer Center, Philadelphia, PA
WE-C1000-GePD-F4-6Electron Energy Spectrometry in Orthovoltage Beams Using Lead Doped Plastic Scintillators
H Nusrat1*, G Pang1,2,3 , A Sarfehnia1,2,3 , (1) Department of Physics, Ryerson University, Toronto, ON, (2) Department of Radiation Oncology, University of Toronto, Toronto, ON, (3) Department of Medical Physics, Odette Cancer Centre, Sunnybrook Health Science Center, Toronto, ON
WE-C1000-GePD-F5-1A Feasibility Study of Adaptive Radiotherapy Based On Varian Halcyon and Velocity Systems: Patient-Specific Dosimetric Indicators of Optimal Replanning Frequency and Timing
Y Huang , Y Zhang*, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education/Beijing), Peking University Cancer Hospital & Institute, Beijing, 100142 *Corresponding Author: Y Zhang email: zhangyibao@pku.edu.cn
WE-C1000-GePD-F5-2Comparison of Two CBCT Correction Methods for Daily Adaptive Therapy Dose Tracking
D Pittock1*, N Lamba1 , S Ginsburg1 , I Dragojevic2 , A Kruzer1 , A Nelson1 , (1) MIM Software Inc., Cleveland, OH, (2) UC San Diego, Chula Vista, CA
WE-C1000-GePD-F5-3Increase of Adaptive Re-Planning Frequency with Using Automated Daily Dose Tracking
K Kainz*, S Lim , G Chen , X Li , Medical College of Wisconsin, Milwaukee, WI
WE-C1000-GePD-F5-5Towards Efficient Adaptive-Radio-Therapy in Prostate and Head & Neck Cancer Utilizing Iterative-CBCT and Automated Software
K Padgett*, R Delgadillo , M Studenski , M Abramowitz , M Samuels , N Dogan , Univ Miami, Miami, FL
WE-C1000-GePD-F7-3Investigating a Dynamic Dose Rate Approach for Rotating Gamma Ray Systems
A Eldib1*, B Nguyen2 , J Li3 , G Mora4 , O Chibani1 , M Abdelgawad5 , L Chen1 , C Ma1 , (1) Fox Chase Cancer Center, Philadelphia, PA, USA (2) Prowess Inc., Concord, CA, USA (3)OUR United Corporation, Xian, China, (4) Universidade de Lisboa, Codex, Lisboa, Portugal, (5) Biophysics branch, Physics Department, faculty of science, Al-Azhar University, Cairo, Egypt
WE-C1000-GePD-F7-4Frame-Based Radiosurgery of Multiple Metastases Using Single-Isocenter Volumetric Modulated Arc Therapy (VMAT) Technique
K Ahn1,2*, K Yenice1 , M Koshy1,2 , K Slavin2 , B Aydogan1 , (1) University of Chicago, Chicago, IL, (2) University of Illinois at Chicago, Chicago, IL
WE-C1000-GePD-F9-4Investigation On KV Dependent SSDE Corrections for Low KV and Small Patient Scans: Phantom Based Evaluation
Y Tian1 , X Cai1*, Y Yang1 , (1) Siemens Shanghai Medical Equipment Ltd., Shanghai
WE-C1000-GePD-F9-5Size-Specific Dose Estimates (SSDE) for Pelvic CT Image Acquisitions: TG204 Vs. TG220 and a New Density Scaling Method
D Mihailidis1*, V Tsapaki2 , (1) University of Pennsylvania, Philadelphia, PA, (2) Konstantopoulio General Hospital, Anixi, Attiki,
WE-C1030-GePD-F2-2Automated Anatomic Classification of CBCT Data From Single Projection Images Using Machine Learning
B Preusser*, E Pearson , H Al-Hallaq , The University of Chicago, Chicago, IL
WE-C1030-GePD-F5-5Utilizing the Clique Atrous Spatial Pyramid Pooling for Pancreas Segmentation
M Yang1 , X Qi2 , S Tan1 (1) Huazhong University of Science and Technology, Wuhan, China,(2) UCLA School of Medicine, Los Angeles, CA
WE-C1030-GePD-F6-2Automating Quality Assurance of MLC Via Real-Time Radioluminescent Imaging Technique
M Jia1*, C Jenkins2 , Y Yang3 , B Han4 , L Xing5 , (1) Stanford University, Palo Alto, CA, (2) Stanford University, Palo Alto, CA, (3) Stanford University Cancer Center, Stanford, CA, (4) Stanford Univ School of Medicine, Stanford, CA, (5) Stanford University School of Medicine, Stanford, CA
WE-C1030-GePD-F6-4GPU-Based Acceleration of FastEPID Image Simulation
M Shi1,2*, M Myronakis2 , M Jacobson2 , D Ferguson2 , C Williams2 , I Valencia Lozano2 , T Harris2 , M Lehmann3 , P Huber3 , R Fueglistaller3 , P Baturin4 , D Morf3 , R Berbeco2 , (1) University of Massachusetts Lowell, Lowell, MA, (2) Brigham and Women's Hospital, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA, (3) Varian Medical Systems, Baden-Dattwil, Switzerland, (4) Varian Medical Systems, Palo Alto, CA
WE-C1030-GePD-F6-6Real-Time 4D CT Image Reconstruction From Transit Images by Amplitude Scaling of Deformation Vector Field
J Jung1*, J Kim2 , I Yeo3 , B Yi4 , (1) East Carolina Univ, Greenville, NC, (2) Stony Brook University Hospital, Stony Brook, NY, (3) University of Rochester Medical Center, Rochester, NY, (4) Univ. of Maryland School Of Medicine, Baltimore, MD
WE-C1030-GePD-F8-5Novel CT and MR Compatible Phantom to Mimic Liver Fat Concentration
R Zhao*, D Hernando , K Li , J BRITTAIN , P PICKHARDT , S REEDER , University of Wisconsin-Madison, Madison, WI
WE-C1030-GePD-F9-1Do Commercially Available In- Plane Bismuth Breast Shields Are Consistent with Patients Care?
V Karami1 , M Albosof2 , M Najaran1 , M Gholami3 , H Khosravi4*, (1) Dezful University of Medical Sciences, Dezful,Iran (2) School of Technical and Engineering, Dezful Branch, Islamic Azad University, Dezful,Iran (3) Lorestan University of Medical Sciences, Khoram Abad,Iran (4) University of Mississippi Medical Center, Jackson, MS
WE-C1030-GePD-F9-2Skin Exposure Estimation From Annual Survey Data for Computed Tomography
V Garcia*, W Wang , University of Oklahoma Health Science Center, Oklahoma City, OK
WE-C1030-GePD-F9-5Can CT Image Truncation Cause False Dose Alerts in a Dose Management System?
N Fitousi1*, A Dedulle2 , J Jacobs3 , H Bosmans4 , (1) Qaelum NV, Leuven, ,(2) Qaelum NV, Leuven, ,(3) Qaelum NV, Leuven, ,(4) University Hospitals Leuven, Leuven,
WE-C1030-GePD-F9-6Ideal Broad-Beam Geometry/attenuation, Effective Energy, and Its Impact in CT Dosimetry
N Ruiz Gonzalez*, G Clarke , UT Health Sciences Center, San Antonio, TX
WE-C930-GePD-F1-2Effect of Leaf Size and Off-Axis Delivery On Plan Quality for Single Isocenter Multi-Lesion Plans in RayStation
G Cardarelli1*, Z Saleh2 , M Schwer3 , D Cutright4 , J Kelley5 , J Brindle6 , M Rivard7 , T Roth8 , J Hepel9 , C Liu10 , E Klein11 , (1) Rhode Island Hospital / Warren Alpert Medical, Providence, RI, (2) Rhode Island Hospital / University Of Rhode Island, Providence, RI, (3) Rhode Island Hospital / Warren Alpert Medical, Warwick, RI, (4) University of Chicago Medicine, Chicago, IL, (5) UF Health Cancer Center at Orlando Health, Orlando, FL, (6) Rhode Island Hospital / Warren Alpert Medical, Providence, Rhode Island, (7) Rhode Island Hospital / Brown University, Providence, RI, (8) The Warren Alpert Medical School of Brown Univ., Providence, RI, (9) The Warren Alpert Medical School of Brown University, Providence, (10) Rhode Island Hospital, Providence, RI, (11) Rhode Island Hospital / Warren Alpert Medical, Providence, RI
WE-C930-GePD-F2-4Improving Treatment Plan Dose Accuracy Using a Deep Learning-Based Dose Conversion Scheme
Y Xing*, Y Zhang , D Nguyen , M Lin , W Lu , S Jiang , UT Southwestern Medical Center, Dallas, TX
WE-C930-GePD-F3-1A New Stereotactic Radiotherapy Machine for Whole Body Cancer Treatment with Automatic Beam Quality Assurance and End-To-End Image Guidance
J Li1*, H Yan1 , J Zhang1 , P Zan1 , X Li2 , J Li1 , C Ma3 , H Liu1 , 1) OUR United Corporation, Xi'an, China (2) Tsinghua University, Beijing,China (3) Fox Chase Cancer Center, Philadelphia, PA,
WE-C930-GePD-F4-2Feasibility Study of a Robot-Based Thermoplastic Mask for Conventional Linac-Based Cranial SRS Treatments Without Online Tracking
S Jang*, J Chang , D Heron , M Huq , UPMC Hillman Cancer Center and University of Pittsburgh School of Medicine, Pittsburgh, PA
WE-C930-GePD-F4-5Commissioning and Clinical Experience of Brainlab's Multimet Element Planning System for Cranial SRS Treatments On Elekta's VersaHD
R Sandhu*, C Knill , R Halford , Z Seymour , K Lee , C Hyde , Beaumont Health, Dearborn, MI
WE-C930-GePD-F4-6Beam and Dose Targeting Accuracy of a Novel Self-Shielded Radiosurgery System
D Pinnaduwage1*, S Srivastava1 , S Jani1 , X Yan1 , M Bodduluri2 , S Sorensen1 , (1) Barrow Neurological Institute (BNI) St. Joseph's Hospital & Medical Center, Phoenix, AZ, (2) Zap Surgical Systems, Inc., San Carlos, CA
WE-C930-GePD-F5-1A Robust Dose Calculation Algorithm Using Displacement Vector Fields From Deformable Image Registration: Simulation Study On Phantom Motion
S Ahmad1, N Alsbou2,I Ali1 , (1) University of Oklahoma Health Sciences, Oklahoma City, OK, (2) Department of Engineering and Physics, University of Central Oklahoma, Edmond, OK
WE-C930-GePD-F6-3Automated CBCT Image Quality Assurance for Gamma Knife Icon System
F.Q. Guo1, 2*, (1) Yale School of Medicine, New Haven, CT, (2) Yale New Haven Hospital, New Haven, CT
WE-C930-GePD-F7-5Innovative Solid State Detectors For New Beam Monitoring In Proton Therapy
A Vignati1*, Z Ahmadi Ganjeh2 , M Boscardin3,4 , N Cartiglia1 , M Donetti5 , G Dalla Betta4,6 , F Fausti1 , M Ferrero1 , F Ficorella3,4 , S Giordanengo1 , O Hammad Ali1,7 , M Mandurrino1 , F Marchetto1, F Mas Milian7,8 , M. Mohammadian-Behbahani9, V Monaco1,7 , L Pancheri6 , G Paternoster3,4 , R Sacchi1,7 , V Sola1 , A Staiano1 , R Cirio1,7, (1) INFN - National Institute for Nuclear Physics, Torino, TO, Italy (2) Yazd university, Yazd, Iran (3) Bruno Kessler Foundation, Trento, Italy (4) TIFPA, INFN, Trento, Italy (5) Fondazione CNAO, Pavia, Italy (6) Universita degli Studi di Trento, Trento, Italy (7) Universita degli Studi di Torino, Torino, Italy (8) Universidade Estadual de Santa Cruz, Ilheus, Brazil (9) Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
WE-C930-GePD-F8-2Feasibility of X-Ray-Induced Acoustic Computed Tomography for Breast Imaging by Monte Carlo Simulation
J Wang1,2 , Y Nomura3 , H Shirato1,2 , L Xing1,4 , H Peng1,4,5*, (1) Global Station for Quantum Medical Science and Engineering, Hokkaido University Global Institute for Collaborative Research and Education (GI-CoRE), Sapporo, (2) Department of Radiation Medicine, Hokkaido University Graduate School of Medicine, Sapporo, (3) Department of Radiation Oncology, Hokkaido University Graduate School of Medicine, Sapporo, (4) Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA, (5) Department of Physics, Wuhan University School of Physics and Technology, Wuhan, Hubei
WE-C930-GePD-F8-5Quantitative Analysis of Bony Anatomy Vs Soft Tissue Matching Using CBCT in Treatment of Pancreatic Cancer
S Balyimez*, C Chen , E Parsai , University of Toledo Medical Center, Toledo, OH
WE-C930-GePD-F9-6Spectral Modulator With Flying Focal Spot: A New Concept of Full-Scale Multi-Energy Cone-Beam CT and Simultaneous Scatter Correction
Hewei Gao*, Chengpeng Wu and Sen Wang, Tsinghua University, Beijing 100084, China
WE-D-TOUR-I-0Brain CT Perfusion
K Little*, Ohio State University, Columbus, OH
WE-FG-303-7Photoacoustic CT to Characterize the Effects of Antiangiogenic Drugs On Acute and Chronic Hypoxia
D Miles*, K Stantz , Purdue University, West Lafayette, IN
WE-FG-304-4Label-Free, Non-Contact Hyperspectral Imaging for Classification of Histologic Grade in Gross Specimens of Squamous Cell Carcinoma Using Deep Learning
M Halicek1*, J Dormer1 , M Pham1 , J Little2 , A Chen2 , L Myers3 , B Sumer3 , B Fei1,3 , (1) University of Texas (UT) at Dallas, Richardson, TX, (2) Emory University, School of Medicine, Atlanta, GA, (3) UT Southwestern Medical Center, Dallas, TX
WE-FG-304-9Improve Deformable Imaging Registration Accuracy Using Pulmonary Vascular Extraction for Lung CT Images
D Yang*, Y Fu , X Wu , H Li , Washington University School of Medicine, St. Louis, MO
WE-HI-301-3A Collimator Setting Optimization Algorithm for Dual-Arc Volumetric Modulated Arc Therapy in Pancreas Stereotactic Body Radiation Therapy
X Li1*, Q Wu1 , M Palta1 , Y Zhang2 , Y Sheng1 , J Zhang1 , C Wang1 , (1) Duke University Medical Center, Durham, NC, (2) UT Southwestern Medical Ctr at Dallas, Dallas, TX
WE-HI-SAN2-6BEST IN PHYSICS (MULTI-DISCIPLINARY): Initial Experience with a Robotically Positioned Clinical Prototype Prompt Gamma-Ray Spectroscopy System for in Vivo Proton Range Verification
J Verburg*, F Hueso-Gonzalez, T Ruggieri, T Bortfeld, Massachusetts General Hospital and Harvard Medical School, Boston, MA
WE-HI-SAN2-10Method for Fluence Field Optimization to Achieve Non-Convex Image Noise Prescriptions with Fluence-Modulated Proton CT
J Dickmann*1, P Wesp1, S Rit2, M Pankuch3, R P Johnson4, V Bashkirov5, R W Schulte5, K Parodi1, G Dedes1, G Landry1,6, (1) Ludwig-Maximilians-Universitaet Muenchen, Munich, Germany, (2) Universite de Lyon, Lyon, France, (3) Northwestern Medicine Chicago Proton Center, Warrenville, IL, (4) U.C. Santa Cruz, Santa Cruz, CA, (5) Loma Linda University, Loma Linda, CA, (6) University Hospital, LMU Munich, Munich, Germany
WE-HI-SAN2-11Monte Carlo Dosimetric Assessment of Synthetic CT Images Generated Using a Deep Learning Approach for MRI-Only Proton Treatment Planning
S Kazemifar1*, A Barragan Montero2 , K Souris3 , S Rivas4 , X Geets5 , R Timmerman6 , Y Park7 , S Jiang8 , E Sterpin9 , A Owrangi10 , (1) UTSW, Dallas, TX, (2) Universite Catholique de Louvain, Brussels, VBR, (3) UCL, Brussels, ,(4) ,Leuven, ,(5) Imagerie Moleculaire et Radiotherapie Experimental, Brussels, ,(6) UT Southwestern Medical Center, Dallas, TX, (7) UT Southwestern Medical Center, Dallas, TX, (8) UT Southwestern Medical Center, Dallas, TX, (9) ,Leuven, VBR, (10) UT Southwestern Medical Center, Dalllas, TX
WE-J-221AB-0Innovations in X-Ray Detectors
W Zhao1*, L Antonuk2*, C Ullberg3*, (1) SUNY Stony Brook, Stony Brook, NY, (2) University of Michigan, Ann Arbor, MI, (3) XCounter AB, Danderyd,
WE-J-221CD-0Tailoring CT Protocol to Patient Age and Size with a Focus On Pediatric Patients
Z Qi1*, F Ranallo2*, K Applegate3*, (1) Henry Ford Health System, Troy, MI, (2) University of Wisconsin, Madison, WI, (3) Kentucky Children's Hospital, Lexington, KY
WE-J-301-3Accurate and Instant Prediction of Electron Cutout Factor by An Efficient Residual Neural Network (ResNet) Model
C He1 , L Lu2 , T Zhu3 , D Nie4 , S Chang5 , D Shen6 , J Lian7*, (1) Duke University, Durham, ,(2) The University of North Carolina at Chapel Hill, Chapel Hill, NC, (3) Univ of North Carolina at Chapel Hill, Chapel Hill, NC, (4) UNC Chapel Hill, Chapel Hill, ,(5) UNC School of Medicine, Chapel Hill, NC, (6) University of North Carolina at Chapel Hill, Chapel Hill, ,(7) Univ North Carolina, Chapel Hill, NC
WE-J-301-6JACK FOWLER JUNIOR INVESTIGATOR COMPETITION WINNER: Self-Powered Thin-Film Multi-Layer Aerogel-Based X-Ray Detector Employing Fast Electron Current
D Brivio1*, M Gagne2, E Freund2, E Sajo2 , P Zygmanski1 , (1) Brigham and Women's Hospital, Dana Farber Cancer Institute and Harvard Medical School, Boston, MA, (2) Univ Massachusetts Lowell, Lowell, MA
WE-J-301-8Impact of Delivery Characteristics On Dose Delivery Accuracy of Volumetric Modulated Arc Therapy for Different Treatment Sites
J Li1*, X Zhang1 , J Li1 , R Jiang2 , J Sui2 , M Chan3 , R Yang1 , (1) Peking University Third Hospital, Beijing, (2) Institute of Automation, Chinese Academy of Sciences, Beijing, (3) Memorial Sloan Kettering Cancer Center, Basking Ridge, NJ
WE-J-301-9Monte Carlo Modeling and Validation for MLC Based Electron Apertures
M Kaluarachchi*, M Schwer , Z Saleh , E Klein , Rhode Island Hospital / Warren Alpert Medical School of Brown, Providence, RI
WE-J-303-5Analytical Grayscale Transformation for Gain-Setting Calibration in Quantitative Ultrasound Radiomics
X He*, X Yang , J Wynne , D Yu , J Beitler , W Curran , T Liu , Emory University, Atlanta, GA