目的 探讨短暂性脑缺血发作（transient ischemic attacks，TIA）时磁共振血管成像病变特点。方法 选取我院收治的60例TIA患者，行磁共振血管成像检查颅内动脉、颈部动脉，分析患者颅颈部供血动脉病变特点、狭窄情况。结果 磁共振检查发现脑供血动脉狭窄患者53例(88.33%)，未见异常者7例（11.67%）。其中，颈内动脉系统发现病变者40例(75.47%)，椎基底动脉系统发现病变者13例（24.53%）。不同动脉系统的病变在颅内外的分布无统计学差异（χ²=4.94，P=0.08470）。53例发生狭窄病例中，共有病变动脉92支，其中轻度狭窄20支，中度32支，重度38支，2支闭塞；按发生支数依次排序为颈内动脉、大脑中动脉、椎动脉、颈总动脉、基底动脉、大脑前动脉起始段、大脑后动脉。结论 磁共振技术诊断TIA客观，综合患者临床情况对于制定治疗方案具有重要的临床意义。

Objective To study the lesion characteristics in magnetic resonance angiography imaging in transient ischemic attacks. Methods Sixty patients with transient ischemic attacks in this hospital were recruited to examine intracranial artery and carotid artery by magnetic resonance angiography. We analyzed the lesion characteristics of cranium-neck blood-supplying arteries, such as narrowing, and angiosclerosis. Results 53(88.33%) patients had cerebral artery stenosis and 7（11.67%）patients had nothing abnormal detected by magnetic resonance imaging. Forty patients had lesions in internal carotid artery system and 13 patients in vertebral basilar artery system. There was no significant difference in distribution of intracranial and extracranial lesions between different arterial systems, χ²=4.94，P=0.08470. There were 92 arteries with lesions in 53 patients with cerebral artery stenosis: mild stenosis in 20 branches, moderate stenosis in 32 branches, severe stenosis 38 branch, occlusion 2 branch. The number of affected branches increased in the order: internal carotid artery＜middle cerebral artery＜vertebral artery＜common carotid artery＜basilar artery＜anterior cerebral artery initial segment＜posterior cerebral artery. Conclusions Magnetic resonance angiography is useful in the evaluation of etiological factors and must be performed to guide the treatment of patients with transient ischemic attacks.