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目的：评价ＭＲＡ诊断脑血管狭窄与闭塞的价值及限度，并对假阳性、假阴性进行分析。材料与方法：对１４例患者的１２０根正常、狭窄与闭塞血管进行３ＤＴＯＦＭＯＴＳＡＭＲＡ和ＤＳＡ对照分析。结果：１４例１２０根血管ＭＲＡ与ＤＳＡ诊断相符合血管数为１０９根（９０．８％），ＭＲＡ对正常脑血管的敏感性、特异性、准确性分别为９１％、９０．３％、９０．８％；对狭窄血管分别为８３．３％、９２．１％、９０．８％；对闭塞血管分别为１００％、９６％、１００％。结论：ＭＲＡ对评价正常脑血管和闭塞脑血管精确性较高，而对颅内狭窄血管的评价不及ＤＳＡ，特别是颈内动脉虹吸部和大脑中动脉Ｍ１、Ｍ２的评价存在假阳性或假阴性，因此ＭＲＡ可用于筛选可疑颅内动脉狭窄或闭塞的患者，避免或减少血管造影的次数
Objective: To evaluate the value and limit of MRA in diagnosing cerebrovascular stenosis and occlusion, and to analyze the false positive and false negative. Materials and Methods: 3D-TOFMOTSAMRA and DSA were performed in 120 normal, stenotic and occluded vessels in 14 patients. Results: The MRA of 109 vessels (90.8%) were consistent with the DSA in 14 cases of 120 vessels. The sensitivity, specificity and accuracy of MRA for normal cerebrovascular were 91%, 90.3%, 90 .8% for stenotic vessels, 83.3%, 92.1% and 90.8% for stenotic vessels, and 100%, 96% and 100% for occluded vessels, respectively. Conclusions: MRA is more accurate for the evaluation of cerebrovascular in normal cerebrovascular and occlusive vessels, while the evaluation of intracranial stenotic vessels is less than the evaluation of DSA, especially in the siphon of the internal carotid artery and middle cerebral artery M1, M2, there is a false positive or false negative , MRA can be used to screen patients with suspected stenosis or occlusion of intracranial arteries to avoid or reduce the number of angiography