Coronary arteries: Retrospectively ECG-gated multi-detector row CT angiography with selective optimization of the image reconstruction window
Coronary arteries: Retrospectively ECG-gated multi-detector row CT angiography with selective optimization of the image reconstruction window
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DOI：
10.1148/radiol.2213010174
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发表时间：
2001-12-01
期刊：
影响因子：
19.7
通讯作者：
Claussen, CD
中科院分区：
文献类型：
--
作者：
Kopp, AF;Schroeder, S;Claussen, CD
目的：研究如何利用回顾性门控技术优化心脏周期内三条主要冠状动脉的多探测器行计算机断层扫描（CT）图像重建。材料与方法：对50例患者进行多排冠状动脉CT血管造影，在心脏周期的20%-80%处以10%的增量重建。两名独立盲法评论者评估了1-3段（右冠状动脉）、5-8段（左主干和左前降支动脉）、11段和12段（左旋动脉）三维后处理后的图像质量，包括伪影和可见性。分为以下几个等级：1，非常差；2、贫穷;3、公平;4,好;5，很好。结果：左前降支在心脏周期的60% ~ 70%舒张中期可见效果最佳，左旋动脉在50%舒张中期可见效果最佳。右冠状动脉最佳重建窗口为40%，差异有统计学意义（P < 0.05）。虽然两位评论者之间的一致性很好（kappa = 0.75），但在患者群体中存在很大程度的差异。结论：冠状动脉CT血管造影图像重建窗口应适应各冠状动脉。在心脏周期中使用一个固定的时间点进行图像重建不能提供最佳的图像质量。
PURPOSE: To investigate how the technique of retrospective gating can be used to optimize reconstruction of multi-detector row computed tomographic (CT) images for each of the three major coronary arteries during the cardiac cycle.MATERIALS AND METHODS: Multi-detector row coronary CT angiograms obtained in 50 patients were reconstructed at 20%-80% of the cardiac cycle in increments of 10%. Two blinded independent reviewers assessed the image quality, in terms of artifacts and visibility, obtained with three-dimensional postprocessing for segments 1-3 (right coronary artery), segments 5-8 (left main and left anterior descending coronary arteries), and segments 11 and 12 (left circumflex artery). The following grades were assigned: 1, very poor; 2, poor; 3, fair; 4, good; and 5, excellent.RESULTS: The left anterior descending artery was best visualized in middiastole at 60%-70% of the cardiac cycle, and the left circumflex artery was best visualized at 50%. The optimal reconstruction window for the right coronary artery was significantly different at 40% (P < .05). Although there was good agreement (kappa = 0.75) between the two reviewers, there was a high degree of variation in the patient population.CONCLUSION: The image reconstruction window for CT angiography of the coronary arteries should be adapted to each coronary artery. The use of one fixed time point in the cardiac cycle for image reconstruction does not provide optimal image quality.