使用Bravos控制软件v1.2的环应用器组件类型的环应用器调试的实践经验
Xiuxiu He1, Michael A Trager1, Gil'ad N Cohen1
1Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, USA.
Journal of applied clinical medical physics
|May 3, 2025
概括
为Bravos v1.2环应用器组件类型 (ACT) 开发了一种新的调试方法. 最佳的0.2厘米偏移将剂量测量差异最小化,比传统的刚性ACT提高了准确性.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 支臂疗法技术 支臂疗法技术
背景情况:
- 支臂疗法治疗的准确性受源位置的影响.
- 布拉沃斯v1.2系统引入了一个环应用器组件类型 (ACT),以提高几何精度.
- 几何和剂量测量差异可能来自源定位的不准确性.
研究的目的:
- 为了调试CT/MRI兼容的Bravos v1.2.2.版本的环应用器.
- 为了评估与传统的刚性ACT相比,新环ACT的性能.
- 研究一种用于准确定位源的新型调试方法.
主要方法:
- 在三个Bravos后装机中评估了两种调试方法.
- 修改后的Varian调试涉及更小的步骤尺寸,交替的停留时间,包括奇偶/偶位.
- 在30度,45度和60度的环上,用不同的偏移 (0.0-0.2厘米) 进行了片分析.
主要成果:
- 确定了0.2厘米的最佳偏移,最大限度地降低了所有环和后载机的计划和交付的居住位置之间的偏差.
- 刚性ACT与环形ACT相比,呈现出更大的位置差异.
- 在关键临床指标 (D95,D90,D2cc) 和EQD2值方面,最佳偏移减少了剂量测量差异 (<1%).
结论:
- 一种新的调试程序有效地确定了一个最佳的偏移,以准确地定位源与环ACT.
- 这种方法显著降低了剂量测量差异,提高了治疗的准确性.
- 开发的程序标准化了使用v1.2控制系统的Bravos后装载机的调试,其性能优于刚性ACT.
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