对Geant4进行定量评估,用于预测离子束疗法中正电子发射碎片的产量和分布
Andrew Chacon1, Harley Rutherford1,2, Akram Hamato3
1Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW, Australia.
Physics in medicine and biology
|May 22, 2024
概括
研究人员比较了用于离子治疗的Geant4模拟模型,发现Geant4 10.2与二进制离子级联 (BIC) 或量子分子动力学 (QMD) 最好预测正子发射碎片. 这些模型被推用于未来的重离子疗法研究.
科学领域:
- 医学物理 医学物理
- 核物理 核物理 核物理
- 计算物理 计算物理
背景情况:
- 对正子发射碎片的精确模拟对于验证碳和氧离子疗法中剂量输送至关重要.
- Geant4蒙特卡洛工具包被广泛用于此类模拟,但其物理模型的准确性各不相同.
研究的目的:
- 为了比较不同的hadronic无弹性物理模型在Geant4中的预测准确性,用于离子治疗中的正电子发射碎片.
- 为了确定最佳的Geant4版本和物理模型组合来模拟这些碎片.
主要方法:
- 用碳和氧离子辐射的幻影材料 (聚乙烯,凝,PMMA).
- 获取4D PET图像以确定放射性核酸的贡献.
- 使用30个Geant4模型版本组合 (版本10.0-11.1;BIC,QMD,INCL++模型) 的模拟实验.
- 将模拟预测与实验数据进行比较,使用正常化平均二次误差和皮尔森相关系数.
主要成果:
- 在Geant4版本和材料中,模型性能差异很大.
- 在大多数情况下,使用二进制离子级联 (BIC) 模型的Geant4 10.2显示出最好的总体协议.
- 量子分子动力学 (QMD) 为峰值正电子产量的深度和远端50%点提供了最准确的估计.
- 利日内核级联 (INCL++) 模型通常表现最差.
结论:
- 具有BIC或QMD的Geant4 10.2.p03提供了最准确的预测,用于重离子疗法中的正电子灭绝空间分布和碎片生成.
- 这些特定的版本/模型组合被推用于重离子疗法模拟的未来研究.
关键词:
吉安特4蒙特卡洛模拟工具箱中的一个.碳离子束疗法是一种碳离子束疗法.碎片化模型的碎片化模型.哈德龙模型 哈德龙模型离子束疗法 离子束疗法定子发射断层扫描 (PET) 是一种质量保证 质量保证 质量保证更多相关视频
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