减少计算机断层扫描速度改善胸部立体体辐射治疗患者的对齐错误
Ramaswamy Sadagopan1, Rachael M Martin-Paulpeter1, Christopher R Peeler1
1Department of Radiation Physics, The University of Texas M. D. Anderson Cancer Center, Houston, TX 77030, USA.
Cancers
|August 28, 2025
概括
通过缓慢的计算机断层扫描 (CT) 方案,通过减少与运动相关的对齐错误,改善了胸部立体体辐射治疗 (SBRT) 的图像引导准确性. 这种方法对于精确的瘤向至关重要,
科学领域:
- 辐射瘤学
- 医学成像
- 图像指导治疗
背景情况:
- 计算机断层扫描 (CT) 图像中的运动工件可以导致胸部立体体辐射治疗 (SBRT) 的图像引导过程中的对齐错误.
- CT-on-rail (CTOR) 用于图像引导,但其准确性可能会受到患者运动,特别是呼吸运动的影响.
研究的目的:
- 评估慢速CT协议在胸部SBRT的CT-on-rail (CTOR) 图像引导过程中减少运动引起的对准误差的有效性.
- 为了比较标准和慢速CT协议在减少纵向坐标差异方面的性能.
主要方法:
- 使用标准和缓慢的CT协议扫描了一个模拟瘤运动 (不同的呼吸速率和幅度) 的肺幻影.
- 使用内部软件进行图像指导,比较两个CT协议之间的对齐精度.
- 对31名SBRT患者的形光束CT (CBCT) 数据进行了回顾性分析,以评估纵向对齐的系统错误.
主要成果:
- 缓慢的CT方案显示出更好的对齐精度,特别是在更高的运动幅度和更慢的呼吸速率 (例如,在8BPM/15mm幅度下1. 6mm与5. 2mm).
- 患者回顾数据显示模拟和每日CBCT之间的系统差异,表明脊椎体是瘤位置的不可靠替代品.
- 对于运动超过9毫米的瘤,计划目标体积 (PTV) 不足.
结论:
- 缓慢的CT方案可以提高胸部SBRT的准确度,尽管缓慢的呼吸率会带来更大的挑战.
- 准确的纵向瘤定位需要从多个CTOR图像中确定,而不仅仅依赖骨结构.
- 建议从多个CTOR图像中平均坐标,以在胸部SBRT中实现最佳的患者对齐.
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