Duerinckx A J
Radiology Service, Veterans Administration Medical Center, West Los Angeles, CA 90073, USA.
Top Magn Reson Imaging. 1995 Fall;7(4):267-85.
Magnetic resonance angiography (MRA) of the coronary arteries has recently become possible due to the development of a new group of ultrafast imaging sequences. Coronary arteries are small, tortuous vessels subjected to significant physiological motions (respiration and cardiac contractions). Most coronary MRA pulse sequences rely on a combination of segmental acquisition of data (in k-space) to minimize cardiac motion artifacts and patient breath-holding to minimize respiratory motion artifacts. MR is noninvasive, does not require any contrast agents or ionizing radiation, and thus offers the potential of becoming a very important cardiac screening tool. Coronary MRA can routinely depict the proximal and middle portion of most coronary arteries and some coronary artery branches. However, its clinical utility for detecting lesions has not yet been proven. As coronary MRA techniques improve they may become an integral part of the evaluation of patients with ischemic heart disease. Existing coronary MRA techniques can already play a significant clinical role in the evaluation of coronary artery anomalies, in the follow-up of proximal lesions after angioplasty, and in the noninvasive determination of patency of bypass grafts and coronary stents.
由于一组新型超快成像序列的发展，冠状动脉磁共振血管造影（MRA）最近已成为可能。冠状动脉是细小、蜿蜒的血管，会受到显著的生理运动（呼吸和心脏收缩）影响。大多数冠状动脉MRA脉冲序列依靠分段采集数据（在k空间）的组合来尽量减少心脏运动伪影，并让患者屏气以尽量减少呼吸运动伪影。磁共振成像具有非侵入性，不需要任何造影剂或电离辐射，因此有潜力成为一种非常重要的心脏筛查工具。冠状动脉MRA通常可以描绘出大多数冠状动脉的近端和中部以及一些冠状动脉分支。然而，其在检测病变方面的临床实用性尚未得到证实。随着冠状动脉MRA技术的改进，它们可能会成为缺血性心脏病患者评估的一个组成部分。现有的冠状动脉MRA技术已经可以在冠状动脉异常的评估、血管成形术后近端病变的随访以及旁路移植血管和冠状动脉支架通畅性的无创测定中发挥重要的临床作用。
