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对4DCT和4DCBCT在动态幻影中运动和体积测量的精度进行比较评估
Bhumika Handa1, Satyapal Rathee1
1Medical Physics Division, Department of Oncology, University of Alberta, Edmonton, Alberta, Canada.
Journal of applied clinical medical physics
|February 24, 2026
概括
四维圆束计算断层扫描 (4DCBCT) 提供了与四维计算断层扫描 (4DCT) 相比的准确性,用于测量肺瘤运动和体积. 这支持其在图像引导的肺部立体体辐射疗法 (SBRT) 中的使用.
科学领域:
- 医疗成像医学成像
- 辐射瘤学 辐射瘤学
- 放射治疗 物理 物理
背景情况:
- 精确的运动管理对于肺部立体体辐射疗法 (SBRT) 至关重要,以确保精确的治疗计划,目标定位和剂量输送.
- 肺部瘤在上下方向表现出显著的运动 (5-30毫米),需要强大的策略来确定内部目标体积 (ITV).
- 四维计算机断层扫描 (4DCT) 是运动评估的标准,但四维圆束计算机断层扫描 (4DCBCT) 提供了改进在线目标定位的潜力.
研究的目的:
- 为了比较4DCT和4DCBCT在量化目标运动和体积方面的准确性.
- 通过使用幻影模型,评估正常 (阴影) 和不规则 (患者衍生的) 呼吸模式下的表现.
主要方法:
- 一个具有已知目标的胸部幻影经历了4DCT (<60秒扫描时间) 和4DCBCT (120秒扫描时间) 两种成像.
- 使用基本 (FDK) 和先进 (修改的麦金农-贝茨) 算法重建了4DCBCT图像,以减轻文物.
- 运动幅度和目标体积被计算,并与编程值和成像模式之间进行比较.
主要成果:
- 4DCT显示了正常运动幅度的最小偏差.
- 4DCBCT先进算法略低估计了SI运动,而基本算法显示了更大的变化; 3DCBCT估计的变化更高.
- 4DCT和4DCBCT Advance在不规则运动方面显示了可比的结果,在目标体积测量方面有很强的一致性.
结论:
- 4DCBCT在临床工作流程中的运动和体积测量方面表现出与4DCT相似的准确性.
- 4DCBCT提供可靠的运动分辨率和相位依赖的目标体积评估,支持其集成到图像引导肺SBRT.
- 需要进一步的患者研究来评估患者特异性呼吸不规则对4DCBCT准确性的影响.
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