基于射线追踪的高效准分析光子束传输在一个多叶合器中,用于杆上装的O环放射疗法系统
Shusuke Hirayama1, Yusuke Fujii1, Hang Du1
1Hitachi Ltd., Research and Development Group, Environment and Energy Innovation Center, Hitachi-shi, Ibaraki-ken, Japan.
Medical physics
|January 17, 2026
概括
一个新的光线追踪算法有效地计算了在线适应性放射治疗的多叶合器 (MLC) 内传输. 与Geant4相比,这种方法实现了高精度,并加快了56-160倍的计算速度,有助于独立的剂量验证.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 计算科学 计算科学
背景情况:
- 在线适应性放射治疗需要强大的独立剂量验证系统.
- 像IMRT和VMAT这样的先进技术依赖于准确的蒙特卡洛剂量计算.
- 在现代放射治疗中,MLC内部光子传输对于精确的光束成型至关重要.
研究的目的:
- 为MLC内部运输开发一个高效的射线追踪算法.
- 为了使在线适应性治疗中患者QA的独立剂量验证.
- 为了提高放射治疗中剂量计算的准确性和速度.
主要方法:
- 基于交叉点的半分析性射线跟踪算法被开发用于MLC内部的光子传输.
- 考虑了MLC内的光子衰减和康普顿散射.
- 实施了两种俄罗斯轮盘技术,以提高计算效率.
- 该方法与Geant4集成,并使用数字幻影和患者几何形状进行验证.
主要成果:
- 与完整的Geant4模拟相比,该算法准确地复制了流动性和剂量分布.
- 对于相关的voxels,点剂量差异在2%以内.
- 计算效率得到了显著提高,实现了56-160倍的加速度.
- 该方法在不同尺寸的场域中显示出强度.
结论:
- 成功开发了一种高效的准分析MLC运输计算方法.
- 该方法提供了足够的准确性,用于在线适应性放射治疗中独立验证剂量.
- 与GPU加速的蒙特卡洛代码集成是可行的,为QA提供了有价值的工具.
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