64层螺旋CT冠状动脉成像伪影产生原因分析  

The analysis of artifacts in 64-slice spiral CT coronary angiography

作　　者：梁立华[1] 吴菊芳[1] 陈耀强[1] 李曼佳[1] 沈新平[1] 陈丽玲[1] 李锦[1] 

机构地区：[1]广东医学院附属深圳市福田人民医院影像科,518033

出　　处：《中华放射学杂志》2008年第9期923-926,共4页Chinese Journal of Radiology

基　　金：深圳市福田区公益性科研项目资助（FTWS002）

摘　　要：目的探讨64层螺旋CT冠状动脉成像伪影产生的原因。方法100例临床怀疑或已确诊为冠心病的患者，以回颐性心电门控技术行64层螺旋CT冠状动脉平扫和增强扫描，后处理采用最大密度投影（MIP）、多平面重组（MPR）及容积再现技术（VRT），2名经验丰富的影像科医师分析冠状动脉成像伪影产生的原因，统计各类伪影占总伪影的比例。结果100例患者共显示冠状动脉节段1347段，其中存在伪影192段，发生率为14．2％。产生伪影的原因中最常见为呼吸运动，占64．6％（124／192）；其次为心率快及心律不齐，占21．9％（42／192）；而时相伪影占11．5％（22／192），对比剂及扫描参数伪影占2．1％（4／192）。结论呼吸运动、心率快及心律不齐、时相选择不当等会导致伪影，控制呼吸运动及心律不齐、降低心率、多时相重组，可以减少伪影产生及提高诊断准确率.Objective To investigate the reasons of artifacts in 64-slice spiral CT coronary angiography. Methods One hundred patients with diagnosed or suspected coronary artery disease underwent retrospectively ECG-gated 64-slice spiral CT coronary angiography. Maximum intensity projection （MIP） , muhiplanar reformation （MPR） and volume rendering technique （VRT） were reconstructed. The reasons of artifacts were assessed by two experienced radiologists. Results A total of 1347 segments （ 1347/1500, 89. 8% ） were reviewed ,the artifacts were found in 192 segments （ 14. 2% ）. Breath movement was the most common artifact（124/192） , and the other reasons included fast rate and irregular rhythm of the heart beat （42/192） ,while the phase mismatch was the third reason（22/192）. Conclusions The common artifacts of 64-slice spiral CT coronary angiography includes breath movement, fast rate and irregular rhythm of heart beat and phase mismatch. Breath-holding control, low rate and regular rhythm of heart beat, multiphase reconstruction are suggested for the accurate diagnosis.

关 键 词：冠状血管 伪迹 体层摄影术 X线计算机 

分 类 号：R686[医药卫生—骨科学]