前瞻性心电门控单心动周期256排CT成像图像质量影响因素  

Image quality and impact factors for single heart-beat coronary CTA using prospectively ECG-triggered 256-slice CT

作　　者：李远 解学乾[1] 张皓[1] 王毅[2] 李念云 孟捷[1] 张贵祥[1] LI Yuan;XIE Xueqian;ZHANG Hao;WANG Yi;LI Nianyun;MENG Jie;ZHANG Guixiang(Department of Radiology;Department of Cardiology,Shanghai General Hospital,Shanghai Jiao Tong University School of Medicine,Shanghai 200080,China)

机构地区：[1]上海交通大学附属第一人民医院放射科,上海200080 [2]上海交通大学附属第一人民医院心内科,上海200080

出　　处：《中国介入影像与治疗学》2018年第6期369-373,共5页Chinese Journal of Interventional Imaging and Therapy

基　　金：国家自然科学基金面上项目(81471662);科技部国际合作项目(2016YFE0103000)

摘　　要：目的对低心率、高心率和心律不齐患者采用前瞻性心电门控单心动周期冠状动脉CTA,比较图像质量差异及其影响因素。方法采用256排宽探测器CT对208例患者行前瞻性心电门控单心动周期冠状动脉CTA检查,不使用药物控制心率;其中低心率组87例(心率≤70次/分),高心率组38例(心率>70次/分),心律不齐组83例(5个心动周期内的心率变化>10次/分)。常规重建相位为75%或45%;以多时相重建中运动伪影最小者为最优相位。采用单变量线性回归评估影响图像质量评分的因素。结果 105例(105/208,50.48%)最优相位与常规相位不同。最优相位图像中,3组图像质量评分、SNR和CNR差异均无统计学意义(P均>0.05)。线性回归显示,心脏相位和伪影类型是图像质量评分的影响因素(P均<0.001)。结论在不限制心率的前瞻性心电门控宽探测器冠状动脉CTA中,高心率或心律不齐并非影响图像质量的重要因素。Objective To observe image quality and impact factors for single heart-beat coronary CTA（CCTA）with prospectively ECG-triggered CT in patients with low,high heart rate（HR）and arrhythmia.Methods Single heart-beat CCTA was performed for 208 patients with prospectively ECG-triggered 256-slice wide-detector CT without drug control of HR.The patients were divided into 3 groups,including low HR group（n=87,HR≤70 bpm）,high HR group（n=38,HR〉70 bpm）and arrhythmia group（n=83,HR variation〉 10 bpm in 5 cardiac cycles）.The normal reconstruction phase was set as 75% or 45%in R-R interval,while the optimal phase was that with the least motion artifacts.Univariate linear regression was used to analyze the impact factors for image quality.Results Compared with images of normal phase,the optimal phase of 105 patients（105/208,50.48%）was altered.In the optimal images,imaging quality,SNR and CNR were not significantly different among 3 groups（all P〉 0.05）.Image quality was significantly influenced by reconstruction phase and artifact type（both P〈 0.001）.Conclusion During prospectively ECG-triggered 256-slice wide-detector CCTA without drug control of HR,high HR and arrhythmia are not significant impact factors of image quality.

关 键 词：体层摄影术 X线计算机 血管造影术 图像质量 

分 类 号：R816.2[医药卫生—放射医学] R814.42[医药卫生—临床医学]