摘要
目的:该研究旨在用磁共振(MR)自旋回波序列来评估冠状动脉搭桥术远端吻合的开放性并检查移植血管的狭窄和闭塞情况。患者和方法:用1.5T MR扫描仪和冠状动脉造影检查共有481处远端吻合的185例患者。研究采用二维T2加权屏气半傅立叶采集单次激发快速自旋回波序列(Haste)。所有影像均由一名放射科医师和一名心脏病学专家独立评估,并与常规冠状动脉造影结果进行比较。
Objective: The aim of the study was to evaluate the patensies of the distal anastomoses of coronary artery bypass grafts and to detect graft stenoses and occlusions with a magnetic resonance(MR) spin echo sequence. Patients and methods: One hundred and eighty-five patients with 481 distal anastomoses were examined with a 1.5 T MR scanner and coronary angiography. A 2-dimensional T2-weigthed breath-hold half-Fourier acquisition single-shot turbo spin echo sequence(Haste) was performed. All images were evaluated independently by a radiologist and cardiologist and compared to the conventional coronary angiography. The observers were blinded to the coronary angiography findings,but informed in regard to the surgical graft anastomosis. Results: With the Haste sequence, 76%of the distal anastomoses were recognized(368/481). Forty-five of 52(87%) stenoses and all occlusions were identified. The sensitivity and specificity for the evaluation of the distal anastomosis with the spin echo sequence was 87%and 96%. Twenty-four percent of the distal anastomoses were not identified due to a poor image quality or motion artefacts. Conclusion: Using the Haste sequence, a reliable assessment of graft patency of the distal anastomosis is possible. Further improvements of the spatial resolution and the image quality are necessary to recommend this MR technique for routine clinical use.
