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目的:初步探讨16层螺旋CT在不同心率、不同冠状动脉分支最佳重建R-R时相特点。材料和方法:根据心率将89例患者分为四组:A组,心率<60次/min;B组,心率60-69次/min;C组,心率70-79次/min;D组,心率≥80次/min。行16层螺旋CT,0.4s/周扫描,以回顾性心电门控重建10%-90%R-R时相的横断面图像,再进行冠状动脉容积重建,分析不同心率、不同R-R时相冠状动脉各支图像质量。结果:不同的心率冠状动脉各支最佳重建时相不同。A、B组最佳重建窗较宽,左前降支(LAD)、左回旋支(LCX)和右冠状动脉(RCA)大多能在70%和80%R-R时相获得最佳显像;C组LCX最佳重建时相在50%或80%,RCA最佳重建时相在40%-50%,LAD在80%;D组最佳重建窗较窄,RCA、LCX最佳重建时相均在50%,LAD在40%-90%R-R时相得分差异不明显。结论:以0.4s/周的16层螺旋CT冠脉显像,根据心率不同选择重建时相,有助于获得较高图像质量。
Objective: To investigate the characteristics of R-R phase reconstruction of 16-slice spiral CT in different heart rates and different branches of coronary artery. Materials and Methods: According to heart rate, 89 patients were divided into four groups: group A, heart rate <60 beats / min; group B, heart rate 60-69 beats / min; group C, heart rate 70-79 beats / min; Heart rate ≥80 beats / min. After 16-slice spiral CT and 0.4s / week scanning, the cross-sectional images of 10% -90% RR phase reconstruction were retrospectively retrospectively performed. The coronary angiography was performed to reconstruct the coronary artery volume. Each piece of image quality. Results: Different heart rate coronary artery branches of the best reconstruction of different phases. The best reconstructed window in group A and B was wide, and most of the left anterior descending (LAD), left circumflex (LCX) and right coronary arteries (RCA) obtained the best imaging at 70% and 80% The optimal reconstructive time of LCX was 50% or 80%, the optimal reconstruction time was 40% -50%, and the LAD was 80%. The optimal reconstructed window was narrower in group D and the best reconstruction time was 50%, LAD in the 40% -90% RR phase difference is not obvious. Conclusion: 16-slice spiral CT coronary angiography at 0.4s / week can improve the quality of images based on different reconstruction of heart rate.