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在放射治疗中对光中子的TOPAS模拟:精度和速度与减小方差

J Ramos-Mendez¹, Catalan R Ortiz¹, J Schuemann²

¹Department of Radiation Oncology, University of California San Francisco, San Francisco CA, United States of America.

Physics in medicine and biology

|April 24, 2024

概括

这项研究优化了TOPAS蒙特卡洛对线性加速器 (linacs) 的模拟,通过提供粒子分裂数和用于光中子模拟的新物理模块,显著提高了效率和准确性.

科学领域:

医学物理医学物理
计算物理计算物理
辐射瘤学辐射瘤学

背景情况:

蒙特卡洛模拟对于精确的放射治疗剂量计算至关重要.
在模拟中优化计算效率对于临床应用至关重要.
高Z材料中的光子核过程对辐射疗法模拟产生影响.

研究的目的:

为了确定对线性加速器 (linac) 处理头的TOPAS模拟的最佳粒子分裂数.
开发和验证一个新的TOPAS物理模块来模拟光子中子的产生和运输.
提高涉及光子核相互作用的TOPAS模拟的效率和准确性.

主要方法:

对西门子Oncor linac进行TOPAS模拟,以找到最佳的定向制动辐射分裂参数.
模拟对横向剂量配置文件和百分比剂量深度曲线 (PDD) 的已公布数据进行了验证.
开发了一种定制的TOPAS物理模块 ("TsPhotoNeutron"),并根据测量的中子产量和能量光谱进行验证.

主要成果:

定向制动辐射将计算效率提高了两个数量级.
新的TOPAS物理模块提高了光中子收益率计算效率的27.6.6倍.
模拟显示了高精度,侧面形状在1mm/2%内,PDD曲线在测量数据的1mm/1%内.

结论:

最佳的粒子分裂数和新的TOPAS物理模块显著提高了模拟效率和准确性.
这些进展对于模拟放射治疗中的光核过程和探索新的治疗方式至关重要.
开发的工具可以在复杂的材料和处理场景中更精确地建模辐射传输.

关键词:

蒙特卡罗的蒙特卡罗是一个非常好的城市.托帕斯 (TOPAS) 是一个著名的品牌.林亚克是什么意思中子中子中子是中子中子.减小差异减小差异减小一个X射线.

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