在头部计算机断层扫描中基于器官的管道电流调节的多中心特征:一个剂量测量和图像质量研究
Séléna Pondard1, Corentin Desport1, Mélodie Munier2
1Alara Expertise, 7 Allée de l'Europe, 67960 Entzheim, France.
概括
基于器官的管道电流调制 (OBTCM) 在CT扫描期间有效降低对前头的辐射剂量. 图像质量得到维护,使OBTCM成为放射学中剂量减少的有价值工具.
科学领域:
- 医学成像物理 医学成像物理
- 辐射技术 辐射技术
背景情况:
- 计算机断层扫描 (CT) 使用X射线,需要剂量减少策略.
- 基于器官的管道电流调制 (OBTCM) 是一种旨在根据解剖位置优化辐射剂量的技术.
研究的目的:
- 评估OBTCM在头部CT检查中的有效性,跨越各种放射科部门和CT扫描仪制造商.
- 量化OBTCM对辐射剂量和图像质量的影响.
主要方法:
- 来自四个机构的五台CT扫描仪使用标准和常规头部协议进行了评估.
- 管道出口的Kerma被测量使用一个放置在门架上的探测器.
- 图像质量使用头部幻影进行评估,测量信号与噪声比 (SNR),Hounsfield单位 (HU) 标准偏差和噪声功率谱 (NPS).
主要成果:
- 根据扫描仪和协议,OBTCM实现了前管出口基马的减少,从11%到74%不等.
- 在GE和佳能扫描仪上,后管出口的kerma保持不变,但在西门子扫描仪上增加了39%.
- 图像噪声和SNR显示了高达10%的统计显著增加 (p <0.05),而噪声纹理保持一致.
结论:
- 在头部CT中,OBTCM有效地降低了前置辐射剂量.
- 该技术保留了用于诊断解释的基本图像质量参数.
- 在常规头部CT协议中,OBTCM显示了剂量优化的潜力.
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