Study on the establishment of quality control system of TaiChi accelerator on the basis of AAPM TG119 reporter
10.3969/j.issn.1672-8270.2024.06.001
- VernacularTitle:基于美国医学物理学家协会TG119报告的TaiChi加速器质量控制体系建立研究
- Author:
Tingtian PANG
1
;
Tao WANG
;
Qiqi LEI
;
Bo YANG
;
Zhiqun WANG
;
Jie ZHANG
;
Yinzhu CHEN
;
Shihao LI
;
Peng ZAN
;
Jie QIU
Author Information
1. 中国医学科学院 北京协和医学院 北京协和医院放疗科 北京 100730
- Keywords:
TG119 report of American Association of Physicists in Medicine(AAPM);
Accelerator;
Intensity-modulated radiation therapy(IMRT);
Volumetric-modulated arc therapy(VMAT)
- From:
China Medical Equipment
2024;21(6):1-5,11
- CountryChina
- Language:Chinese
-
Abstract:
Objective:The purpose of this study is to test and assess the model of modeling data of TaiChi accelerator in the Raystation Treatment Planning System(RayStation system)according to the test method and item of TG119 report of American Association Physicians Medicine(AAPM).Methods:The intensity-modulated radiation therapy(IMRT)and volumetric-modulated arc therapy(VMAT)plans of the test cases of different clinical situations,which included the simulated multi target region,prostate target region,head and neck target region,easy type C-shape target region plan and difficult type C-shape target region plan,were designed according to the AAPM TG119 report in the treatment planning system.The deviations of the doses of point and area of the two kinds of plans were measured,and the measured results were compared and analyzed with the recommended standards of AAPM TG119 report.The IBA CC13 ionization chamber and the ArcCHECK matrix ionization chamber were used respectively to verify the point dose and area dose,and the assessment standard was γ passing rate under 3%3mm.The confidence interval was adopted to judge the consistency between the measured dose and the calculated dose.Results:The accuracies of plan dose target,point dose deviation and area dose distribution of tested cases could meet the requirement of the TGl19 report.The deviations of mean doses for the high-dose points of IMRT plan and VMAT plan of tested cases were respectively(0.39±1.02)%and(1.27±0.64)%,and the confidence intervals of them were respectively 2.39%and 2.52%.The average dose deviations of low doses of organ at risk(OAR)of IMRT plan and VMAT plan were respectively(0.53±1.73)%and(0.88±1.11)%,and the confidence intervals were respectively 3.92%and 3.06%.The average γ passing rate under 3%/3mm of IMRT plan and VMAT plan were respectively(99.52±0.366)%and(99.86±0.136)%,and the confidence intervals of them were respectively 1.196%and 0.406%.Conclusion:The TaiChi accelerator performance and the accuracy of Raystation system 6MV FFF model fitting can meet the standard of TG119 report,and the subsequent standards of the quality control of equipment and patients were established according to these tested results,which would provide reference for the improvement of the performance of subsequent accelerator.
