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Dosimetric Evaluation of Couch Based Tracking Method Using Robotic Arm-Based Couch

M Cho1*, M Lee2 , H Lee3 , s Kim4 , B Cho5 , (1,2,4,5) Asan Medical Center, Seoul, SEOUL,(3) Korea Advanced Institute of Science and Technology, Yuseong-gu, Daejeon,


(Thursday, 8/2/2018) 10:00 AM - 12:00 PM

Room: Davidson Ballroom A

Purpose: To evaluate dosimetric feasibility of a couch based tracking method using robotic arm based couch.

Methods: Couch based tracking system consists of 6-DOF articulated robotic manipulator, a three-dimensional (3D) optical tracking system, a phantom that mimicked respiratory motion, and control software for managing the system components. The tracking system is designed to predict the respiratory movement because it is known that latency occurs during the machine movement and calculation the process. Dosimetric experiment was conducted to evaluate the feasibility of the system. In the experiment, we intended to verify the dosimetric gain of the tracking method. Three patient’s VMAT lung SABR treatment plan and respiratory motion file was used. We compared tracking case and non-tracking case by using gamma analysis. Criterion of gamma analysis was 3%, 3 mm.

Results: The measured data showed 95.8% and 88.1% gamma passing rate for tracking and non tracking cases on average.

Conclusion: The proposed method demonstrated a feasibility of robot-couch tracking method for tumor motion compensation during radiation therapy. However, further study is needed with full-scale robot couch system for clinical investigation.

Funding Support, Disclosures, and Conflict of Interest: This work was supported by the Radiation Technology R&D program (2013M2A2A7043506) through the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning.


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