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使用EUD量化空间异质碳离子剂量分布的生物效应

Toshiro Tsubouchi¹, Misato Umemura², Kazumasa Minami³

¹Department of Medical Physics, Osaka Heavy Ion Therapy Center, 3-1-10 Otemae, Chuo-ku, Osaka, Osaka Prefecture, 5400008, JAPAN.

Biomedical physics & engineering express

|January 12, 2026

概括

碳离子疗法可以通过使用空间异质的剂量分布和变化的线性能量转移 (LET) 来改善瘤控制和减少正常组织损伤. 均等剂量 (EUD) 有助于评估这些复杂的治疗计划.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
放射生物学的放射生物学

背景情况:

碳离子疗法比传统辐射疗法具有潜在的优势.
空间异质的剂量分布和变化的线性能量转移 (LET) 是碳离子疗法的关键参数.
了解细胞对这些参数的生存反应对于优化治疗疗效和最大限度地减少副作用至关重要.

研究的目的:

实验性地研究瘤和正常细胞对空间异质碳离子剂量分布的生存反应.
评估不同峰值-谷值剂量比率 (PVDR) 和 LET 条件的影响.
评估等效均剂量 (EUD) 对分析这些反应的有用性.

主要方法:

辐射HSGc-C5 (瘤) 和Nuli-1 (正常组织) 细胞系使用不同空间剂量模式 (网格,框架,半) 和PVDR水平的碳离子束.
应用低LET (~10keV/μm) 和高LET (~50keV/μm) 的条件.
克隆基因生存测试以确定生物反应.
基于物理剂量和EUD的生存数据的分析,使用线性二次方程 (LQ) 模型.

主要成果:

在高LET和高PVDR条件下,瘤细胞显示出增强的细胞毒性.
在低LET辐射下,正常细胞表现出轻微的节约效应.
不同的空间剂量模式导致可测量的生存差异,即使在相同的总剂量和PVDR.
基于EUD的分析促进了异质和均剂量分布之间的定量比较.

结论:

空间剂量异质性和LET可以被操纵以改善瘤控制和减少碳离子治疗中的正常组织并发症.
相当的均剂量 (EUD) 方法为评估空间调制粒子疗法的治疗计划提供了有价值的工具.
这些发现支持通过精确控制剂量分配和LET来优化碳离子疗法.

关键词:

碳离子放射疗法碳离子放射疗法相当于统一剂量的一致剂量网格疗法是一种网络疗法.迷你光束辐射疗法空间分成的辐射疗法空间分成的辐射疗法

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