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一台商用机器的蒙特卡洛建模和FLASH-minibeam用电子辐射的实验设置

Anthony Bonfrate^1,2, Maria Grazia Ronga^1,2, Annalisa Patriarca¹

¹Institut Curie, PSL Research University, Radiation Oncology Department, Proton Therapy Centre, Centre Universitaire, Orsay, France.

Medical physics

|November 6, 2024

概括

这项研究验证了超高剂量率 (UHDR) 电子微束疗法 (PMBT) 的蒙特卡洛模型. 经过验证的模型和实验设置使未来对这种先进的放射治疗技术进行放射生物学研究成为可能.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
放射治疗技术放射治疗技术

背景情况:

超高剂量率 (UHDR/FLASH) 照射和微粒微束疗法 (PMBT) 提供了改善的健康组织节约和可比的瘤控制.
这些先进的放射治疗技术正在成为传统方法的有希望的替代品.

研究的目的:

开发和验证一个蒙特卡洛 (MC) 模型,用于在UHDR.提供5-7 MeV电子的商用机器.
将模拟结果与实验测量进行比较,用于组合FLASH和PMBT模式的设置.

主要方法:

使用TOPAS3.8/Geant4.10.07.p03和优化的电子源参数建模的加速器元件.
进行了使用7 MeV电子在UHDR的小型光束实验,并使用各种黄铜聚合器 (切口宽度为400μm).
进行了补充模拟,以评估PMBT聚合器参数对峰值-谷值剂量比 (PVDR) 和Bremsstrahlung光子剂量的影响.

主要成果:

在MC模拟和剂量分布测量之间取得了良好的一致性 (<4%的差异).
在使用PMBT聚合器时,观察到3%内的剂量概况差异.
报告的高PVDR (5-26) 高达4毫米深度,并实现了1.2 × 105 Gy/s的瞬间剂量速率.

结论:

成功验证了用于UHDR电子小束疗法的MC模型.
建立了一个功能性电子FLASH-迷你光束实验设置.
经过验证的模型和设置已准备好用于未来的放射生物研究.

关键词:

一个闪光灯.电子电子电子电子粒子迷你光束疗法粒子迷你光束疗法超高剂量速率的超高剂量速率

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