(Sunday, 7/12/2020) [Eastern Time (GMT-4)]
Room: AAPM ePoster Library
Purpose:
Develop and evaluate an automatic planning (AP) for prostate SBRT with and without lymph node using Eclipse’s Script and RapidPlan
Methods:
ESAPI and Microsoft Visual Studio were used to create a series of Scripts (C#) executable in Eclipse v15.6.06 (Varian) in order to automate prostate SBRT workflow treatment planning. It’s includes creation of planning structures, VMAT plan generation (technique, prescription and isocenter), optimization based on RapidPlan (PO_15606), dose calculation and plan evaluation (automatic dosimetric data extraction from ARIA database). RapidPlan model for prostate SBRT with lymph node (SBRT_36/25Gy) were created using 41 plans and for prostate SBRT alone (SBRT_36Gy) 57 plans were used. 20 plans, for each SBRT technique were used to compare automatic versus manual (using Script for planning structures creation and RapidPlan) treatment planning. Comparison were done using treatment planning time (from CT's uploading to objectives verification), PCI (Paddick’s conformity index), PTV_D95%, PTV_D2% and MU. A quality score (QS) index was used for comparison, it is defined as dose weighted difference sum for each clinical objective above a tolerance (Ideal QS is 100).
Results:
Automatic treatment planning time for SBRT_36/25Gy (SBRT_36Gy) was 22±8 min (13±5 min) and the corresponding manual time was 49±15 min (41±12 min). For SBRT_36/25Gy (SBRT_36Gy) the PCI was 1.17±0.05 (1.18±0.06) for AP and 1.2±0.1 (1.2±0.1) for manual. No differences wer found for PTV_D95% and PTV_D2%. For SBRT_36/25Gy (SBRT_36Gy) the MU needed was 2377±248 (2468±383) for AP and 2556±118 (2473±180) for manual. For SBRT_36/25Gy (SBRT_36Gy) the QS was 93.4±7.5 (95.1±5.3) for AP and 92.5±10.1 (95.1±7.5) for manual.
Conclusion:
Automation planning is feasible for prostate SBRT and was successfully implemented. Automatic plans using ESAPI and RapidPlan without user intervention are clinically acceptable. The process reduces planning time and eliminate random planning errors, regardless of user’s skills.
Keywords
Not Applicable / None Entered.
Taxonomy
TH- External Beam- Photons: Development (new technology and techniques)
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