最后顶点的分割:一个新的追溯蒙特卡洛分割技术,应用于LINAC外场剂量计算
Maxime Jacquet1,2, Jean Michel Létang1, Thomas Baudier1,2
1CREATIS; CNRS UMR 5220; INSERM U 1044, Université de Lyon; INSA-Lyon; Université Lyon 1, Lyon, France.
Physics in medicine and biology
|July 18, 2025
概括
一种新的最后顶点分割 (LVS) 技术可以在高衰减介质中加快蒙特卡罗模拟. 这种方法提高了外场剂量计算,使得更快地生成用于放射治疗和其他应用中的深度学习的数据.
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:
- 蒙特卡洛 (MC) 模拟对于放射治疗中精确的剂量计算至关重要.
- 在高衰减介质中的模拟,如LINAC聚合器,是计算密集的.
- 有效的场外 (OOF) 剂量预测对于治疗规划和安全至关重要.
研究的目的:
- 引入一种新的减差技术,即最后一个顶点分割 (LVS),以加速MC模拟.
- 为了提高在高衰减介质中场外 (OOF) 剂量计算的效率.
- 为深度学习模型培训提供大型MC数据集的生成提供便利.
主要方法:
- 开发和实施了最后一个顶点分割 (LVS) 减差技术.
- 集成的LVS与混合轨道长度估计器 (hTLE) 增强性能.
- 在MC模拟中评估了LVS方法的计算加速度和残余偏差.
主要成果:
- 在对高衰减介质的MC模拟中,LVS显著减少了计算时间.
- 该方法在与hTLE相结合时,可实现高达x4.5和x10的效率加快.
- 由LVS引入的剩余偏差仍然低于1%,确保准确性.
- 加快的MC模拟能够快速生成用于深度学习的数据集.
结论:
- 最后顶点分裂 (LVS) 是在放射治疗中加速MC模拟的有效技术.
- 该LVS方法优化了光子跟踪和相互作用建模,以更快地计算OOF剂量.
- 这种方法在放射治疗,辐射屏蔽和其他粒子传输模拟中具有广泛的适用性.
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