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评估基于框架的放射性外科手术的立体学准确性与患者特定的MRI扭曲校正

Cory Knill¹, Robert Halford¹, Raminder Sandhu¹

¹Department of Radiation Oncology, Corewell Health William Beaumont University Hospital, Royal Oak, Michigan, USA.

Journal of applied clinical medical physics

|July 23, 2024

概括

磁力共振成像 (MRI) 扭曲会影响基于框架的立体射线手术 (SRS) 治疗. 使用扭曲纠正 (CDC) 软件纠正这些扭曲,可以提高对脑标的治疗精度和剂量测量精度.

科学领域:

医学物理医学物理
辐射疗法辐射疗法
神经瘤学神经瘤学

背景情况:

基于框架的立体性放射性手术 (SRS) 依赖于准确的成像,以精确地划分目标.
磁共振成像 (MRI) 中的几何扭曲可能会损害治疗的准确性.
评估和纠正这些扭曲对于优化SRS结果至关重要.

研究的目的:

研究MRI扭曲对基于框架的SRS治疗的影响.
评估SRS临床扭曲校正的必要性.
评估扭曲纠正 (CDC) 算法的有效性.

主要方法:

18名患有80个大脑点的患者接受了基于框架的SRS.
扭曲纠正 (CDC) 软件被用于纠正MRI扭曲.
规划目标量 (PTVs) 在调整之前和之后进行了比较 (PTV_ORIG,PTV_CORR,PTV_RECON).
分析了剂量参数 (Dmin,D95%) 和正常组织剂量 (V12Gy,V10Gy,V5Gy).

主要成果:

经过校正的PTV (PTV_CORR) 与未经校正的重新轮的PTV (PTV_RECON) 相比,显示出明显不同的剂量变化.
一种统一的1毫米PTV扩展并没有完全覆盖所有纠正的目标.
疾病预防控制中心的算法显著提高了目标划分的准确性,并减少了剂量测量偏差.

结论:

在基于框架的SRS目标划分中,MRI扭曲构成了重大挑战.
疾病预防控制中心的算法为缓解MRI扭曲提供了一个可行的解决方案.
实施扭曲校正可以提高SRS中的处理精度和剂量计准确性.

关键词:

这就是为什么MRI是MRI.在SRS中,它是SRS.扭曲扭曲扭曲扭曲扭曲

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