实施和验证快速蒙特卡洛代码作为二次剂量计算引擎用于用窄光束进行质子疗法
Vadim P Moskvin1, Austin Faught1, Fakhriddin Pirlepesov1
1Department of Radiation Oncology, St. Jude Children's Research Hospital, Memphis, TN, United States of America.
Biomedical physics & engineering express
|June 30, 2025
概括
开源的蒙特卡洛代码MCsquare被验证为强度调节质子疗法的快速二次剂量计算引擎. 它准确地计算了狭窄质子束的剂量分布,匹配先进的代码和患者QA数据.
科学领域:
- 医学物理 医学物理
- 计算物理 计算物理
- 放射治疗 物理 物理
背景情况:
- 强度调节质子疗法 (IMPT) 需要精确的剂量计算,特别是对于狭窄光束.
- 蒙特卡洛 (MC) 模拟提供了高精度,但可能是计算密集的.
- 开发快速可靠的二次剂量计算引擎对于临床实施至关重要.
研究的目的:
- 实施和验证MCsquare,一个快速,简化的开源MC代码,作为IMPT的二次剂量计算引擎.
- 为了评估MCsquare在微光束修改的同步子系统产生的狭窄质子束 (1-2毫米点大小) 的性能.
- 为了比较MCsquare的剂量计算与已建立的MC代码 (TOPAS) 和患者特异性质量保证 (QA) 测量.
主要方法:
- 使用MCsquare和TOPAS建模了一个质子疗法系统,并结合了调试数据.
- 从CT图像中获得的患者几何学中的模拟剂量分布.
- 将计算的剂量分布与203个患者特异性QA测量 (94个治疗领域) 进行了比较,使用马分析 (3%/3毫米标准).
主要成果:
- 对于患者特定的QA,MCsquare实现了高马传递率:99.4% (主光束) 和100% (小光束).
- 用MCsquare和TOPAS计算的剂量分布在患者CT几何学上是统计学上相同的.
- 与TOPAS相比,MCsquare的模拟时间显著更快 (每计划1-25分钟),可比的统计准确度为2%
结论:
- MCsquare是一个快速而准确的二次剂量计算引擎,用于IMPT中狭窄的质子束.
- 它的性能可与TOPAS等显式多粒子MC代码相提并论.
- MCsquare的速度和准确性支持其在临床质子疗法工作流程中的使用.
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