两种调强治疗计划系统的Axesse加速器光子束模型验收测试

目的 研究Monaco、Oncentra TPS的Axesse加速器光子束模型的验收测试,以期确定两者同时验收的完整方法。方法 验收前考虑两TPS相矛盾的参数,将加速器对应参数调至两TPS的交集部分;验收分为点、面、MLC特性模拟测试,MLC特性测试包括凹凸槽、穿射、“offset”、“Gain”值等。

Acceptance testing of photon beam model in Axesse accelerator in two intensity-modulated treatment planning systems

Objective To investigate the acceptance testing of the photon beam model in Axesse accelerator in Monaco and Oncentra treatment planning systems (TPS),in order to establish an integral method for the acceptance of both systems at the same time.Methods The conflicting parameters of the two TPSs were determined before acceptance,and the corresponding parameters in the accelerator were adjusted to the overlapping values.The acceptance test was performed from the aspects of point dose,surface dose,and characteristic simulation of multi-leaf collimator (MLC).The test case for point dose was designed based on TRS430,TG53,and practical situations.The test case for surface dose included conventional radiation field and intensity-modulated radiotherapy (IMRT) cases.The test of the characteristics of MLC included concave-convex groove,leakage,and values of" offset" and" Gain".Results The error of most point doses were within 4％,and only some measuring points in the penumbra region and outside the radiation field had an error of＞4％.The γ pass rate of the surface dose tests and IMRT cases was＞90％ at a value of 3 mm/3％except three test cases.Oncentra could only simulate the situation with a positive offset value of MLC,but Monaco could simulate the situation with both positive and negative offset values of MLC.Conclusions The results show that this method can accurately validate all the parameters of the two systems and realize the accurate acceptance of Monaco and Oncentra systems with Axesse accelerator.Both Monaco and Oncentra models can meet the needs for clinical calculation.