脏和干净剂量概念:朝着创建具有光子样剂量响应的质子疗法治疗计划的方向
Lena Heuchel1, Christian Hahn1,2,3, Jakob Ödén4
1Department of Physics, TU Dortmund University, Dortmund, Germany.
Medical physics
|October 25, 2023
概括
使用新的脏和干净剂量概念,减少了质子疗法的不确定性,创造了更强大的治疗计划. 这种方法模仿了光子剂量反应,提高了对有风险的器官 (OAR) 的准确性.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 质子疗法是一种治疗方法.
背景情况:
- 风险器官光子疗法耐受剂量 (OAR) 引入了质子疗法的不确定性,因为假设1.1的相对生物有效性 (RBE) 恒定.
- 质子疗法的变量RBE在应用已建立的基于光子的OAR耐受性极限时需要进行调整.
研究的目的:
- 引入一种新的"脏和干净剂量"概念,以创建更像光子一样的OAR剂量反应的质子疗法计划.
- 通过管理剂量分配,减少在质子疗法中应用基于光子的耐受剂量的不确定性.
主要方法:
- 1.1加权剂量分配被分为"干净" (低线性能量转移 - LET) 和"脏" (高 LET) 组件.
- 一个"MaxDirtyDose"目标被纳入治疗计划的优化,要求设置LET值和最大污染剂量水平.
- 针对头骨病例创建了DDopt (污染剂量优化) 计划,并与参考计划 (RefPlan) 进行了比较,以了解剂量分布和正常组织并发症概率 (NTCP).
主要成果:
- 与RefPlans相比,DDopt计划在OAR中降低了高LET剂量,导致NTCP显著减少 (高达19个百分点).
- 虽然OAR和健康的大脑组织中的1.1-加权剂量略有增加,但它仍然在临床耐受性水平内.
- 与RefPlans相比,DDopt计划在不同的α/β比率 (2-3 Gy) 中显示了NTCP的较小变化.
结论:
- 污染和清洁剂量概念使生物强大的质子疗法计划的开发成为可能,其剂量响应类似于光子.
- 这种方法减轻了RBE的不确定性,从而减少了用于OAR的基于光子的耐受剂量时的不确定性.
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