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优化图像重建技术的呼吸门肺部立体体射线疗法治疗计划使用四维CT:一个幻影研究

Kenji Yasue¹, Hiraku Fuse², Minori Takaoka³

¹Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, 4669-2, Ami, Inashiki, Ibaraki, 300-0394, Japan. yasueke@ipu.ac.jp.

Radiological physics and technology

|October 16, 2024

概括

优化四维计算机断层扫描 (4DCT) 图像重建对于肺部SBRT治疗计划至关重要. 基于阶段的重建对吸入期间的基线漂移敏感,可能会降低目标剂量.

科学领域:

医学物理医学物理
辐射疗法辐射疗法
图像重建图像的重建

背景情况:

患者的呼吸显著影响4DCT图像质量和放射治疗规划中的准确性.
呼吸系统参数和图像重建技术的变化可能会影响目标剂量递送.

研究的目的:

优化4DCT图像重建技术,用于肺SBRT治疗计划.
在不同的4DCT重建方法中评估呼吸系统参数对目标剂量的影响.

主要方法:

来自30个呼吸运动数据集的量化呼吸参数 (周期,振幅,基线漂移).
获得了4DCT图像,并生成了基于相位和振幅的重建图像 (RI).
计算目标剂量并使用皮尔森相关系数 (r) 进行统计分析.

主要成果:

基于阶段的RI显示了目标剂量和基线漂移在吸入区域之间的显著负相关性 (r = -0.52).
在基于阶段的RI中,目标剂量减少,基线漂移≥0.8毫米/秒.
基于幅度的RI显示,在任何地区,呼吸系统参数和目标剂量之间没有显著的相关性.

结论:

基于振幅的4DCT重建对呼吸参数变化不如基于相位的重建那么敏感.
基于阶段的RI的目标剂量可能会受到基线漂移的影响,特别是在吸入过程中.
考虑到呼吸系统参数,特别是基线漂移,对于确保肺SBRT的基于阶段的4DCT重建中目标剂量的准确性很重要.

关键词:

4DCT 4DCT是4DCT的直播方式.基于振幅的 RI 是基于振幅的 RI.肺癌是一种肺癌.基于阶段的RIRI.呼吸道封锁技术呼吸道封锁技术刻板印象性的身体辐射疗法

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