TPS Modeling Validation of the First Mevion Pencil Beam Scanning Proton Therapy System in China
10.3870/j.issn.1672-0741.24.08.037
- VernacularTitle:国内首台迈胜质子治疗系统的TPS建模验证
- Author:
Weiqing WU
1
;
Xiaoguang LU
;
Renchao ZHENG
Author Information
1. 华中科技大学同济医学院附属同济医院肿瘤科,武汉 430030
- Publication Type:Journal Article
- Keywords:
pencil beam scanning;
proton therapy system;
TPS;
modeling;
validation
- From:
Acta Medicinae Universitatis Scientiae et Technologiae Huazhong
2025;54(2):234-239
- CountryChina
- Language:Chinese
-
Abstract:
Objective To introduce the method and results of modeling validation of the treatment planning system used in the first Mevion proton therapy system in China.Methods The SOBP(Spread-Out Bragg Peak)beams in water were designed according to the TG-185 report.The treatment plans in water were designed according to the TG-350 report.The treatment plans of patients were designed on the CT images.The plane dose of each beam was measured by using the MatriXX ONE ioni-zation chambers at different depths in the water,and the measurment results were compared with the TPS calculated results to verify the accuracy of the output doses,the error requirements were 2％/2 mm.Results Except for the distal fall-off position,the doses deviation at the SOBP beams center were less than 3％,and the γ analysis pass rates of plane doses were more than 90％.The measured results of the treatment plan beams were within the tolerance of deviation,and the output doses of the beams without or with static adaptive aperture were more accurate in general.With the decrease of beam energy,the error of dose calculation will increase.Conclusion According to the accuracy requirements of the planning system calculation and treat-ment system implementation,the proton therapy system supporting the treatment planning system has been modeled.Some basic performance such as IDD and beam spot is consistent with the actual measurement,and the TPS modeling conforms to the actual performance of the machine executing when calculating the same proton radiotherapy plan.
