中文摘要：

目的评价3TMR对比增强全心冠状动脉成像（CE—CMRA）诊断冠状动脉有意义狭窄（≥50％）的诊断价值。方法顺序搜集53例拟诊冠心病患者行3TCE—CMRA，采用心电门控、呼吸导航和梯度回波序列，并加用非选择性反转恢复脉冲抑制心肌信号。增强采用钆贝葡胺注射液静脉缓慢注射，流率0．3ml／s。以X线冠状动脉造影结果作为参考标准，分别计算CE—CMRA诊断冠状动脉主要分支（9段划分法）和全部分支（15段划分法）有意义狭窄（≥50％）的诊断准确性。结果53例患者中，48例（90％）成功完成检查，平均扫描时间为（9．1±1．8）min。以冠状动脉9段划分标准，3TCE-CMRA在节段水平诊断有意义狭窄的敏感性和特异性分别为92．2％（59／64）和91．5％（324／354）。以冠状动脉15段划分标准，其敏感性和特异性则分别为82．4％（70／85）和86．1％（446／518）。结论3TCE-CMRA诊断冠状动脉主要分支有意义狭窄具有较高敏感性和特异性。对冠状动脉较小分支，3TCE-CMRA的诊断准确性仍有一定的限度。

英文摘要：

Objective To evaluate the diagnostic performance of 3 T contrast-enhanced whole-heart coronary MR angiography （CE-CMRA） in patients with suspected coronary artery disease. Methods 3 T CE-CMRA was performed in 53 consecutive patients. An ECG-triggered, navigator-gated, inversion-recovery prepared, segmented gradient-echo sequence was used to acquire CE-CMRA with slow infusion of 0. 2 mmol/kg Gd-BOPTA. Using X-ray angiography as the reference, the diagnostic accuracy of the CE- CMRA in detecting significant stenosis （≥50% ） was assessed based on the 9 segments of coronary artery main branches and on the 15 segments of the coronary artery, respectively. Results The CE-CMRA examinations was successfully completed in 48 patients （ 90% ）. The average acquisition time of the scan was （9. 1±1. 8 ） min. The sensitivity and specificity of CE-CMRA for detecting significant stenoses based on the 9 segments and 15 segments were 92. 2% （59/64）and 91.5% （324/354） ,82.4% （70/85） and 86. 1% （446/518） ,respectively. Conclusion 3 T CE-CMRA allows for accurate detection of coronary artery stenosis of the main coronary artery branches with high sensitivity and specificity, but is still limited in small coronary branches.