中心距离和裂宽度对强大的目标覆盖和PVDR对使用商业TPS的质子微束辐射疗法的PVDR的影响
Anna C Prins1,2, Erik Traneus3, Mischa S Hoogeman1,2
1Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, The Netherlands.
Medical physics
|February 10, 2026
概括
质子迷你束辐射疗法 (pMBRT) 的规划是可行的,但在峰值与低谷剂量比 (PVDR) 和目标覆盖率之间面临着权衡. 波束深度和几何学显著影响强度,指导未来的pMBRT研究.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 放射治疗技术 放射治疗技术
背景情况:
- 质子迷你束辐射疗法 (pMBRT) 通过空间分化提供了通过空间分化减少正常组织毒性的潜力.
- 这种技术利用精确控制的质子束来实现剂量绘制和节省健康组织.
研究的目的:
- 为了研究多裂隙聚合器 (MSC) 参数对单束pMBRT中强大的目标覆盖率和剂量分配的影响.
- 分析光束几何形状,包括深度和角度,对PVDR和覆盖范围的影响.
主要方法:
- 在RayStation中的蒙特卡洛模拟使用均的水幻影和直径6厘米的临床目标体积 (CTV).
- 创建了19个pMBRT计划,其中包括不同的MSC裂宽度和中心到中心 (CTC) 距离,以及一个开放光束参考.
- 使用复合最大限度优化 (CMRO) 评估了强度,并对设置和范围的不确定性进行了分析,在不同的深度和角度分析了PVDR和目标覆盖范围.
主要成果:
- 在入口PVDR和强大的目标覆盖之间存在很大的权衡;优化一个可能会损害另一个.
- CTV深度和光束几何学极大地影响PVDR和覆盖范围,中间深度 (6-15厘米) 提供最佳平衡.
- 瘤控制概率 (TCP) 当目标内PVDR低 (<1.2) 时与开放光束相比,但随着剂量异质性而降低.
结论:
- 强大的单光 pMBRT 规划是可以实现的,但受到 PVDR 覆盖权衡和光束几何学的限制.
- 研究结果强调了对聚合器参数,光束深度和几何学的重要性,以优化pMBRT计划的稳定性.
- 这项研究为推进强大的pMBRT规划策略和未来研究方向提供了关键的见解.
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