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• W3094096639 abstract "The purpose of the study is to evaluate the end-to-end commissioning accuracy of IMRT and RapidArc for Halcyon linear accelerator based on test cases developed by AAPM Task Group 119 protocol. IMRT dynamic (DMLC) and RapidArc plans were created for TG119 test cases using phantom with contour structure that downloaded from AAPM website. All the plans were generated using a treatment planning system (TPS) for halcyon linear accelerator. All plans were designed using 7-9 beams for IMRT and 2-4 arcs for RapidArc with beam energy of 6MV-FFF (FFF, Flattening filter free). The prescription and planning goals were as kept as per TG119. For point dose measurement CC13 (0.13cc) ion chamber and MVP (Mobius Verification Phantom) were used and measurements were carried out as per TG119 specified points in high gradient regions. Point dose difference was calculated as ratio of difference between measured and planned dose with prescription dose. Similarly, for composite planar dose measurement an independent quality assurance tool was used for measurement. The per-field relative gamma was measured using EPID (electronic portal imaging device) in a way similar to the routine pretreatment patient-specific quality assurance. Planned and measured dose planes were compared based on γ-criteria of 3%/3mm-G (global normalization), and a more stringent 2%/2mm-L (local normalization). All measurements were transferred with the original gantry angle. Confidence limit calculation was done as specified in TG119. At high dose point measurement mean dose differences averaged and corresponding confidence limit were -0.003±0.011 and 0.025 for the IMRT plans, -0.012±0.006 and 0.024 for the RapidArc plans respectively. Planar dose measurement using an independent quality assurance tool gamma passing rate averaged was 99.72%±0.24 for 3%/3mm criteria and 96.80%±1.17 for 2%/2mm criteria for IMRT plans, 99.70%±0.45 for 3%/3mm criteria and 95.24%±2.83 for 2%/2mm criteria for RapidArc plans, respectively. Confidence limit were 0.75 and 1.19 for 3%/3mm and 5.49 and 10.31 for 2%/2mm criteria for IMRT and RapidArc plans. The Confidence limit using 2%/2 mm gamma criteria using electronic portal imaging device were 98.80%±0.01 and 96.60%±0.02 for IMRT and RapidArc plans, respectively. TG 119 report have successfully been used to Validation of dosimetric commissioning accuracy of IMRT and RapidArc for Halcyon linear accelerator. The Confidence limit value of the study could be used as baseline for future patient specific quality assurance. From the obtained data in this study, we conclude that the commissioning of IMRT and VMAT delivery were found within the limits of TG-119." @default.
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• W3094096639 date "2020-11-01" @default.
• W3094096639 modified "2023-10-16" @default.
• W3094096639 title "Validation of Dosimetric Commissioning Accuracy of IMRT and Rapidarc for Halcyon Linear Accelerator Using AAPM TG-119 Protocol" @default.
• W3094096639 doi "https://doi.org/10.1016/j.ijrobp.2020.07.773" @default.
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