由于放射治疗期间的断片间断而导致生物有效剂量下降的剂量补偿:与商业治疗计划系统集成
Hikaru Yamaguchi1,2, Daisuke Kawahara3, Akito S Koganezawa3,4
1Department of Radiation Oncology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8551, Japan.
Biomedical physics & engineering express
|November 14, 2024
概括
这项研究引入了一个新的框架,用于评估和补偿在放射治疗期间因断裂性中断而导致的生物有效剂量 (BED) 降低,以确保更有效的瘤细胞损伤.
科学领域:
- 辐射瘤学 辐射瘤学
- 医学物理 医学物理
- 放射治疗规划 放射治疗规划
背景情况:
- 生物有效剂量 (BED) 对于估计放射治疗中的瘤细胞损伤至关重要.
- 目前的BED计算不考虑在辐射输送过程中发生的断片间断 (IFI).
- IFI可能导致实际输送的BED减少,影响治疗疗效.
研究的目的:
- 开发一个框架来评估由于FI的BED (ΔBED) 减少.
- 创建生物补偿计划 (BCP),抵消IFI的影响.
- 确保在规划目标量 (PTV) 内的BED分布均.
主要方法:
- 用微量测量运动模型 (MKM) 计算了四例脑瘤的 ΔBED.
- 开发了使用治疗计划软件的BCP,重点是 ΔBED 补偿.
- 在各种中断场景 (GRA, τ) 下对非补偿和BCP进行评估的BED体积直方图.
- 分析了不同聚合器角度集的剂量积累特征 (A 计划与B 计划).
主要成果:
- 在不同 PTV 区域的 ΔBED 分布中观察到的"热点",取决于中断 (η) 时门架旋转角度 (GRA) 的百分比.
- 在50%的剂量积累时,最大的 ΔBED 发生,根据中断持续时间 (τ) 的值在 4.5% 到 7.7% 之间.
- 与A计划相比,B计划在照射期间表现出更均的剂量分布.
结论:
- 开发的框架有效量化了IFI对BED的影响.
- 生物补偿计划成功地减轻了IFI造成的BED减少.
- 这些发现支持将IFI补偿纳入放射治疗计划,以改善治疗结果.
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