将TOPAS扩展为具有分析微量测量功能的应用:与nBio轨道结构模拟的应用和基准测试.
Shannon Hartzell1, Alessio Parisi1, Tatsuhiko Sato2,3
1Division of Medical Physics, Department of Radiation Oncology, Mayo Clinic, Jacksonville, FL 32224, United States of America.
Physics in medicine and biology
|April 23, 2025
概括
集成到TOPAS中的分析微量测量函数 (AMF) 提供了一个计算效率高的方法来计算辐射剂量指标. 这一进步显著加快了粒子治疗的模拟,提高了放射生物模型的准确性.
科学领域:
- 医学物理 医学物理
- 辐射生物学 辐射生物学
- 计算科学 计算科学
背景情况:
- 准确的微剂量分布对于理解电离辐射在诸如离子疗法等应用中的生物效应至关重要.
- 传统的轨道结构模拟虽然准确,但计算密集,限制了它们在临床环境中的使用.
- 分析微量测量函数 (AMF) 提供了一种计算效率高的方法来近似轨道结构模拟结果.
研究的目的:
- 在TOPAS (颗粒疗法工具) 平台内实现分析微量测量函数 (AMF).
- 为了能够有效地计算微剂量测量谱和放射生物学指标,例如剂量-平均线性能量 (y ̄D) 和相对生物有效性 (RBE).
- 针对各种离子和临床场景,将AMF的实施与已建立的轨道结构模拟进行基准测试.
主要方法:
- 该AMF已经集成到OpenTOPAS (v4.0.0) 平台中.
- 对放射治疗和太空探索相关的离子进行了模拟 (例如,1H,4He,12C,56Fe).
- 将AMF结果与TOPAS-nBio轨道结构模拟在碳分布布拉格峰 (SOBP) 内的不同深度进行了比较.
主要成果:
- 在TOPAS中AMF的扩展显示出与TOPAS-nBio模拟的合理一致,微剂量测量谱和衍生度量 (y ̄D,RBE) 的平均差异低于10%.
- 使用两种方法的相对生物有效性 (RBE) 计算在碳SOBP中达成5%的协议.
- 与TOPAS-nBio相比,AMF模拟在SOBP中的离散深度实现了超过98%的计算时间减少.
结论:
- 在TOPAS中AMF扩展提供了一个计算效率高,准确的替代方案,用于微量测量分析的轨道结构模拟.
- 这种整合方便了对放射生物学指标的快速和精确计算,这对于推进粒子治疗研究至关重要.
- 该工具支持集成先进的RBE模型,这对于临床治疗规划和优化至关重要.
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