相互作用-强大的优化治疗不规则呼吸的肺部患者用笔束扫描扫描
Ivar Bengtsson1,2, Anders Forsgren1, Albin Fredriksson2
1Department of Mathematics, KTH Royal Institute of Technology, Stockholm, Sweden.
Medical physics
|April 12, 2025
概括
交互强度优化 (IPRO) 有效地减轻了肺癌治疗中的交互效应,即使动作数据有限. 这种方法提高了目标覆盖率,并减少了风险器官剂量,可能减少对复杂运动管理技术的依赖.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 计算生物学 计算生物学
背景情况:
- 笔光束扫描能够精确地准瘤,但对不确定性敏感.
- 强大的优化 (RO) 解决了密度和设置的不确定性; 4D-RO (4DRO) 管理了运动,但往往排除了相互作用效应.
研究的目的:
- 评估交互-强大的优化 (IPRO) 模型的相互作用效应在肺癌患者.
- 评估IPRO在延长运动不确定性的有效性,包括呼吸幅度变化.
主要方法:
- IPRO和单周期变体 (IPRO-1C) 在肺部患者数据上使用来自4DMRI的合成4DCT (s4DCT) 进行了测试.
- 通过将呼吸周期与不同周期和幅度相结合,生成了患者运动场景.
- IPRO和IPRO-1C使用9,25和49种场景进行了评估.
主要成果:
- 与4DRO相比,IPRO和IPRO-1C都改善了接近最糟糕的CTV D98目标覆盖率.
- 使用49种场景的IPRO实现了最大的OAR剂量减少 (平均4.2%的改善).
- 使用9种场景的IPRO-1C提供了显著的OAR剂量减少 (1.7%),计算成本与4DRO相似.
结论:
- 即使使用单周期运动数据,IPRO也能有效地减轻相互作用效应.
- 这种方法可以减少对实时运动管理的需求,提高治疗效率和患者舒适度.
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