《调强放射治疗计划系统性能和试验方法》的个案研究

Case study of functional performance characteristics and test methods for intensity modulated radiation treatment planning system

目的参考《调强放射治疗计划系统性能和试验方法》（标准报批稿），对RayStation调强放疗计划系统进行一系列测试，并验证标准报批稿的可行性。方法试验内容包括治疗计划剂量目标、点剂量计算准确性和剂量分布计算准确性。测试模体包括AAPMTG119号报告的测试例模体和固体水验证模体，调强测试例主要包括模拟多靶区、模拟前列腺肿瘤、模拟头颈肿瘤和模拟C形靶区（又分简单和困难）等。使用常见测量设备和工具，在RayStation和加速器上分别优化计算和测量感兴趣剂量，并计算和分析两者误差。结果5个模拟不同肿瘤计划的剂量目标均满足标准要求。点剂量电离室测量结果均符合标准要求，全部模拟计划的总误差为（0．83±1．65）％。单野剂量分布平面探测器测量结果的1通过率均〉99．0％，复合剂量分布胶片测量结果的1通过率均〉92．5％。结论RayStation调强放疗计划系统性能试验结果均符合标准报批稿要求日证明其可行。

Objective To study a series of tests to the IMRT planning system RayStation, and verify the feasibility of this Standard. Referring to the standard Performance and test methods for intensity modulated radiation therapy （IMRT） treatment planning system （Standard）. Methods Referring to the Standard, the tests include： dose goals used for planning, point dose calculation accuracy and dose distribution calculation accuracy. And test phantoms include： AAPM TGII9 report＇s test cases and solid water phantom for verification, and IMRT test cases include ： multitarget, mock prostate, head/neck and CT- shape （easier version and harder version） and so on. Referring to the Standard, we optimize and calculate doses of interest in RayStation, and use the common measurement equipments and tools, such as an ionization chamber, films, a detector array, and etc, to measure the doses on the accelerator, then calculate and analyze the errors between them. Results The results of dose goals for five different mock plans meet the requirements of the Standard. And the point dose ionization chamber measurements are in line with the requirements of the Standard, and the total error of the mock plans was （0.83 ±1.65 ） %. The γpass rates of per-field measurements using detector array are all greater than 99.0% , and the γpass rates of composite film measurements are all greater than 92. 5%. Conclusions The results of three trials to IMRT performance of RayStation are in full compliance with the requirements of the Standard. And also it is an evidence for the feasibility of this Standard.