[在四维CT和四维形光束CT之间比较目标相位定位与呼吸运动:一个幻影研究]
Shinji Mawatari1, Yoshifumi Oku1, Masahiko Toyota1
1Department of Radiology, Division of Clinical Technology, Kagoshima University Hospital.
Nihon Hoshasen Gijutsu Gakkai zasshi
|September 10, 2025
概括
四维圆束CT (4D CBCT) 精确检测移动的瘤,显示与幻影研究中的4D CT相似的性能. 这种技术有助于放射治疗的呼吸运动管理.
科学领域:
- 医疗成像医学成像
- 辐射瘤学 辐射瘤学
- 图像指导疗法是指导图像的疗法.
背景情况:
- 圆束计算断层扫描 (CBCT) 是放射治疗局部化的标准.
- 呼吸运动使得精确的瘤定位变得复杂,特别是在肺和肝脏.
- 目前的方法难以在整个呼吸循环中追踪瘤轨迹.
研究的目的:
- 通过使用幻影实验,调查与呼吸移动的目标的位置精度.
- 为了比较四维CT (4D CT) 和四维CBCT (4D CBCT),用于跟踪移动目标.
- 评估4D CBCT在模拟呼吸过程中识别目标定位阶段的能力.
主要方法:
- 模拟呼吸运动使用移动的幻影和同步的4D CT/4D CBCT成像.
- 用不同的呼吸周期 (3-7.5s) 和位移 (4-20mm) 模拟瘤运动.
- 使用治疗计划系统分析位置误差和Dice系数.
主要成果:
- 在4D CT和4D CBCT之间,目标心脏的位置误差通常在±1mm内.
- 跨呼吸阶段的目标划分的子系数一般高于0.8.
- 4D CBCT在检测呼吸运动的目标方面表现与4D CT相似.
结论:
- 4D CBCT对受呼吸运动影响的瘤具有相当于4D CT的目标检测能力.
- 这些发现支持使用4D CBCT来改善在呼吸运动存在时的图像导向放射治疗.
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