冠状动脉评分使用虚拟与真实的非对比图像从光子计数冠状动脉CT血管学
Nina P Haag1, Arwed E Michael1, Simon Lennartz1
1From the Department of Radiology, Neuroradiology and Nuclear Medicine, Johannes Wesling University Hospital, Ruhr University Bochum, Hans-Nolte-Strasse 1, 32429 Minden, Germany (N.P.H., A.E.M., J.H.N., J.B., J.R.K.); Institute for Diagnostic and Interventional Radiology, University Hospital Cologne, Cologne, Germany (S.L.); Siemens Healthcare, Erlangen, Germany (C.P., I.S.); and National Center for Tumor Diseases, Dresden, Germany (A.Z.).
使用PureCalcium算法的光子计数CT可以取代传统的非对比CT用于冠状动脉评分,可能减少辐射暴露. 虽然分数有很强的相关性,但一致性有限,影响了一些患者的斑块负担分类.
科学领域:
- 医疗成像医学成像
- 心血管疾病的诊断 心血管疾病的诊断
- 放射学 放射学是一门学科.
背景情况:
- 冠状动脉评分 (CACS) 传统上需要真非对比 (TNC) CT 和对比增强冠状动脉CT血管造影 (CCTA).
- 光子计数CT提供PureCalcium算法,用于从CCTA生成虚拟非对比图像,旨在简化CACS采集.
- 这解决了对双能CT协议的需求,以减少辐射剂量并改善患者的工作流.
研究的目的:
- 为了比较CACS来自PureCalcium虚拟非对比图像与TNC图像.
- 评估差异对将患者分类到临床相关的斑块负担组的影响.
- 评估PureCalcium的潜力,以消除在CCTA协议中需要单独的TNC扫描的需要.
主要方法:
- 从170名患者的光子计数CCTA图像进行了回顾性分析.
- 从TNC和PureCalcium图像中计算的阿加斯顿分数.
- 统计分析包括威尔科克森签名等级测试,同等性测试,布兰德-阿尔特曼分析,类内相关系数和加权的科恩卡帕,用于斑块负担组协议.
主要成果:
- 中位数Agatston得分显示TNC和PureCalcium图像之间没有显著差异 (P = .99),具有强烈的相关性 (ICC,0.98).
- 布兰德-阿尔特曼分析显示,可重复性的极限很大,表明一致性很低.
- 74%的患者被正确地分为使用PureCalcium (κ = 0.88) 的斑块负担组,尽管没有斑块的患者更常被错误分类.
结论:
- 纯图像显示有可能取代TNC扫描用于CACS,显著降低辐射剂量 (平均降低19.7%).
- 在TNC和PureCalcium分数之间存在强烈的相关性,但临床一致性有限.
- 需要进一步验证,以优化PureCalcium,以准确评估斑块负担和患者分层.
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