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- W2012100187 abstract "Purpose: to develop methods to extract the true cross‐beam profiles for TPS commissioning and investigate its clinical impact on patient‐specific IMRT QA. Method and Materials: Two photon beam models, BM6 and BM4, were commissioned using photon beam profiles measured with a 6 mm diameter and a 4 mm diameter ion chambers, respectively. A method was developed to extract the “true” cross‐beam profiles, free of volume averaging effect, using analytic fitting/deconvolution. The method was validated using beam profiles measured with a small (0.8 mm) diode detector for small (⩽ 10×10 cm2) field sizes. These profiles were used to commission a third beam model (BM08). Planar dose distributions for 8 IMRT plans (total of 53 fields) were calculated using the three beam models and measured with a 2‐dimensional detector array. Analysis using percent dose difference and distance‐to‐agreement criteria was done to benchmark the performance of each beam model. Results: Excellent agreement between deconvolved profiles and diode measured profiles validated our analytic deconvolution method. The average passing rates between calculation and measurement were 93.8%, 98.9% and 99.4% for BM6, BM4 and BM08, respectively, when 3%/3mm criteria were used. A gradual increase in passing rates was noticed with the decrease in the size of the detectors used to collect commissioning data. When 2%/2mm criteria were used, the average passing rates increased significantly from 81.6% (BM6) to 92.6% (BM4) and 96.8% (BM08). Conclusion: Our study indicates that volume‐averaging effect can significantly affect the accuracy of dose calculation for IMRT plans. By removing the volume‐averaging effect in beam commissioning, excellent passing rates can be achieved with more stringent criteria such as 2%/2mm. The use of more stringent criteria for IMRT patient‐specific QA would likely result in higher chances of detecting any dosimetric errors arising from the treatment planning or delivery system." @default.
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- W2012100187 date "2008-06-01" @default.
- W2012100187 modified "2023-09-25" @default.
- W2012100187 title "WE-C-AUD C-01: The Extraction of True Profiles for TPS Commissioning and Its Impact On IMRT Patient-Specific QA" @default.
- W2012100187 doi "https://doi.org/10.1118/1.2962698" @default.
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