在多种疾病的放射治疗计划中,改善了剂量相关性对剂量量预测的功能
Peng Zhou1, Jia Luo1, Honghao Xu2
1Department of Cancer Center, Daping Hospital, Army Medical University, Chongqing, China.
Scientific reports
|September 25, 2025
概括
剂量测量特征与风险器官剂量更好地相关,而不是在放射治疗中准确预测剂量体积图 (DVH) 的几何特征. 患者的几何学影响这些相关性,需要对特定器官进行仔细考虑.
科学领域:
- 医学物理 医学物理
- 放射疗法是一种放射治疗.
- 计算生物学 计算生物学
背景情况:
- 准确预测危险器官 (OAR) 剂量对于基于知识的放射治疗治疗计划至关重要.
- 了解各种疾病输入特征和OAR剂量之间的相关性可以提高预测模型的准确性.
- 研究几何和剂量测量特征对于确定OAR剂量-体积直方图 (DVHs) 的最佳预测因素至关重要.
研究的目的:
- 为了比较几何 (剂量距离) 和剂量计 (剂量计与剂量) 特征与OAR剂量的相关性强度.
- 评估距离到目标直方图 (DTH) 和符合计划剂量体积直方图 (CPDVH) 对于DVH预测的预测能力.
- 分析患者几何如何影响这些相关性在鼻,食道和直肠癌放射治疗计划.
主要方法:
- 利用了198个放射治疗计划 (鼻,食道,直肠癌) 的几何 (DTH) 和剂量测量 (CPDVH) 特性.
- 计算了DTH-DVH和CPDVH-DVH之间的Pearson产品时刻相关系数 (R),用于分数OAR量 (30%,50%,60%).
- 将相关性强度进行比较,以确定OAR剂量预测的优越特征类型.
主要成果:
- 剂量测量特征显示,与距离与剂量相关性相比,13个OAR中的10个与OAR剂量有更强的相关性 (例如,脑干: -0.83与0.93,肺: -0.60与0.92).
- 在13个OAR中的10个中,CPDVH-DVH相关性比DTH-DVH更强 (例如,脑干: -0.67与0.80,肺: -0.64与0.76).
- DTH对状体 (-0.88比0.60) 和膀 (-0.56比0.46) 的相关性比CPDVH更强,这表明了几何学的影响.
结论:
- 剂量测量特征通常与OAR剂量具有更强的相关性,有助于在放射治疗中准确预测DVH.
- 患者几何学显著影响剂量测量特征与剂量相关性,特别是当OAR与目标重叠时.
- 仅仅依靠剂量测量特征来预测DVH对于OAR严重受到患者几何形状的影响是不适当的.
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