通过对内立体立体射线手术患者的综合表面和X射线成像来提高位置精度
Caisa Kjellström1,2, Tobias Pommer1,2, Peter Siesjö3
1Medical Radiation Physics, Lund University, Lund, Sweden.
Physics and imaging in radiation oncology
|January 26, 2026
概括
综合表面和图像导向放射治疗 (SGRT-IGRT) 确保了立体射线手术 (SRS) 的高精度. 间弧成像提高了定位准确性,但增加了治疗时间,而内弧成像提供了轻微的准确性好处.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 放射治疗技术 放射治疗技术
背景情况:
- 立体射线手术 (SRS) 要求特殊的位置准确性,以确保安全,高剂量输送.
- 综合表面和图像引导放射治疗 (SGRT-IGRT) 系统对于提高治疗精度至关重要.
研究的目的:
- 评估热光学和立体X射线定位系统之间的一致性.
- 评估不同分数内部工作流对SRS治疗准确度和持续时间的影响.
主要方法:
- 对126名接受Varian Truebeam STx.治疗的SRS患者的回顾性分析.
- 使用Brainlab ExacTrac Dynamic用于患者定位和监测,具有定义的公差.
- 研究了三种工作流程:SGRT + Intra-Arc IGRT,SGRT + Inter-Arc IGRT,以及单独的SGRT.
主要成果:
- 热光学和X射线系统之间的位置差异中位数为≤0.1mm.
- 在整个工作流程中,3D定位的不确定性保持在0.5mm以内.
- 忽略弧间成像扩大位置偏差范围从0.1-0.5毫米到0.1-0.7毫米.
结论:
- 热光学和立体X射线成像显示在机构公差范围内的强烈一致.
- 间弧成像可提高定位准确度,耗费约2分钟的治疗时间.
- 弧内成像提供了边际精度改进,时间影响最小.
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