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基于线性加速器的SRS平台的五年评估是异心点
Yohan A Walter1, Anne N Hubbard1, Phillip F Durham1
1Department of Radiation Oncology, Willis Knighton Cancer Center, Shreveport, Louisiana, USA.
Journal of applied clinical medical physics
|December 2, 2024
概括
这项研究证实,使用ExacTrac图像引导的基于线性加速器的立体射线手术 (SRS) 对内瘤是精确和稳定的. ExacTrac系统有效地减少了沙发休息,确保了安全的治疗.
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:
- 使用线性加速器 (LINACs) 的立体射线外科手术 (SRS) 对内瘤至关重要,需要高的几何精度.
- 像ExacTrac (ETX) 这样的图像引导系统有助于位置验证,但由于ETX不安装在门架上,存在机械刚性问题.
研究的目的:
- 在Elekta Versa HD系统上使用ExacTrac (ETX) 图像引导来评估基于LINAC的SRS的精度和长期稳定性.
- 为了确定与ETX交付SRS的位置不确定性的来源.
主要方法:
- 在5年内对518个温斯顿-卢茨 (WL) 试验进行了回顾性分析.
- 使用ExacTrac (ETX) 在Elekta Versa HD线性加速器上进行对齐.
- 评估了3D和方向错位,桌子旋转效应和门架斜率.
主要成果:
- 观察到显著的稳定性,3D和定向错位始终低于1.0毫米.
- 桌子旋转成为位置不确定性的主要来源.
- 门架斜率是一致的,在门架0和180度处测量1.23±0.18毫米.
- 在断裂内重新定位过程中,ETX有效地减轻了沙发行走.
结论:
- 在Elekta Versa HD平台上以ETX为基础的基于LINAC的SRS显示了对骨治疗的高精度和稳定性.
- 该系统的准确性在SRS交付的可接受公差范围内.
- ETX显著减少了沙发休息,这是一个主要的不确定性来源,支持安全有效的SRS.
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