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对于玛刀中间剂量泄漏的预测模型:R50%_分析-GK

Ivan L Cordrey¹, Sare Kucuk², Chester Ramsey³

¹Thompson Cancer Survival Center, Cumberland Medical Center, Crossville, Tennessee, USA.

Journal of applied clinical medical physics

|November 29, 2024

概括

一个名为R50%Analytic-GK的新模型预测了玛刀 (GK) 立体无线电手术 (SRS) 中的中间剂量泄露. 该模型有助于评估治疗计划,提供剂量泄漏的基准,这对于最小化放射性死风险至关重要.

科学领域:

医学物理医学物理
辐射瘤学辐射瘤学
神经外科神经外科

背景情况:

尽量减少中间剂量泄漏在大脑立体性放射性手术 (SRS) 中至关重要,以减少放射性死的风险.
R50%是量化中间剂量泄漏的一个关键指标.
一个预测模型,R50%Analytic,存在于VMAT交付的SRS.

研究的目的:

为了将R50%Analytic模型扩展到Gamma Knife (GK),交付了SRS,创建了R50%Analytic-GK模型.
为了预测GK Icon治疗中的中间剂量泄漏.
为评估SRS治疗计划提供一个基准.

主要方法:

开发了R50%Analytic-GK模型,使用对球形目标 (0.00144厘米3) 的幻象计算.
用GK Icon.治疗的18例脑转移病例的临床数据验证了该模型.
分析了35个目标 (0.01127.4 cm3),比较预测的R50%Analytic-GK与临床实现的R50%Clinical.

主要成果:

R50%分析-GK通常预测R50%临床的下限.
中位数差异 (R50%临床 - R50%分析 - GK) 为0.92,证实了下限性质.
该模型准确地反映了临床病例中中间剂量泄漏特征,异常值归因于规划复杂性.

结论:

R50%Analytic-GK模型成功地将R50%Analytic框架扩展到GK提供的SRS.
它提供了一种可靠的方法来预测GK Icon治疗中的中间剂量泄漏.
该模型是评估SRS治疗计划质量的宝贵工具.

关键词:

玛刀的使用方法 R50% 分析性分析性在SRS中,它是SRS.表面积面积面积面积面积面积面积面积面积这样一来,它就变成了 Δr.

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