![]() With comparison between measurement result and TPS calculation result, the absolute dose deviations are within the range of ± 3%, and the gamma passing rates are all over 95% for all VMAT plans, which are within the tolerance of clinical acceptability. ![]() Among three beam-matched linacs, discrepancy in beam output factor, percentage depth dose at 5 cm, 10 cm, 20 cm depth and MLC leaf offset are all within 1% except 20 × 20 cm 2 and 30 × 30 cm 2 field sizes, and discrepancy in beam profile is all within 2%. Measurement results were compared with treatment planning system (TPS) calculation results for all VMAT plans. Each VMAT plan was executed sequentially on three linacs respectively. ![]() For eighteen lung and esophagus cases, fifty-four plans were generated using VMAT technique with three linac beam models respectively for point dose measurement and three-dimensional dose measurement. ![]() Beam data was measured on three beam-matched linacs including Synergy1, Synergy2 and VersaHD. Our objective was to provide a method for selecting reference beam model and evaluating the dosimetric accuracy of volumetric modulated arc therapy (VMAT) plans delivered on three Elekta beam-matched linacs during radiation oncology.
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