心率及重建时相对64层CT冠状动脉成像图像质量的影响

首都医科大学学报 ›› 2008, Vol. 29 ›› Issue (6): 778-783.

心率及重建时相对64层CT冠状动脉成像图像质量的影响

胡斌¹, 徐文坚², 张通¹, 陈海松²

1. 青岛市市立医院CT室;2. 青岛大学附属医院医学影像科

收稿日期:2008-08-20 修回日期:1900-01-01 出版日期:2008-12-24 发布日期:2008-12-24

Coronary Angiography with 64-slice Spiral CT:Influence of Reconstruction Interval and Heart Rate on Image Quality

Hu Bin¹, Xu Wenjian², Zhang Tong¹, Chen Haisong²

1. Department of Radiology, Qingdao Municipal Hospital;2. Department of Radiology, Affiliated Hospital of Qingdao University

Received:2008-08-20 Revised:1900-01-01 Online:2008-12-24 Published:2008-12-24

摘要/Abstract

摘要： 目的探讨不同重建时相对64层CT冠状动脉成像质量的影响.方法 64例患者采用64层CT回顾性心电门控冠状动脉成像,扫描原始数据不同时相重建,用横断面、曲面重建、容积再现等方法对图像质量综合评分.患者心率>65次/min为I组(n=36),65～79次/min为Ⅱ组(n=18),≥180次/min为Ⅲ组(n=10),患者冠状动脉血管分为12段,4条冠状动脉分支(左冠状动脉主干、左前降支、左回旋支、右冠状动脉)用于图像质量分析.结果 I和Ⅱ组60%、65%相位图像质量最优,Ⅲ组右冠状动脉(rightcoronaryartery,RCA)最优的相位窗为40%相位,左同旋支(leftcircumflex coronary artery,LCX)、左前降支(lef tanterior descending coronary artery,LAD)、左主干(leftmain,LM)最优的相位窗为60%.结论心率低于80/次/min的患者冠状动脉重建时相首选舒张中期60%或65%时相;心率高于80次/min患者,按左、右冠状动脉分支分别进行重建有利于提高冠状动脉的成像质量.

关键词: 64层CT, 冠状血管造影术, 重建间隔

Abstract: Objective The reconstructive intervals providing best image quality for non-invasive coronary angiography with 64-slice computed tomography(CT) were evaluated.Methods Contrast enhanced,retrospectively electrocardiography(ECG)-gated 64-slice CTcoronary angiography was performed in 64 patients.Depending on the average heart rate during scanning,patients were grouped as <65 bpm(n=36),65～79 bpm(n=18) and ≥80 bpm(n=10).Two blinded and independent readers assessed the image quality of each coronary segment with a diameter ≥1.5 mm using the following scores: 5,no motion artifacts;4,minor artifacts;3,moderate artifacts;2,severe artifacts;and 1,not evaluative.Results Best image quality was obtained in all coronary segments at 60% or 65% for groupⅠandⅡ.In group Ⅲ.The left main artery,the left anterior descending artery and the left circumflex artery were clearly visualized at 60% of R-Rphases,while the right coronary artery was seen at 40% of R-Rphases.Conclusion When heart rate is <80bpm,64-slice CTcoronary angiography provides best image quality in mid-diastole,diagnostic image quality of all coronary segments can be obtained at reconstruction interval of 60% or 65%.When heart rate is ≥80 bpm,the right and left coronary artery should be reconstructed respectively to improve the image quality of coronary.

Key words: 64-slice CT, coronary angiography, reconstruction interval

中图分类号:

胡斌;徐文坚;张通;陈海松. 心率及重建时相对64层CT冠状动脉成像图像质量的影响[J]. 首都医科大学学报, 2008, 29(6): 778-783.

Hu Bin;Xu Wenjian;Zhang Tong;Chen Haisong. Coronary Angiography with 64-slice Spiral CT:Influence of Reconstruction Interval and Heart Rate on Image Quality[J]. Journal of Capital Medical University, 2008, 29(6): 778-783.