脑动脉狭窄的CTA和MRA及DSA对照分析

目的：探讨CT血管成像（CTA）和磁共振血管成像（MRA）对脑动脉狭窄的诊断价值。方法：52例临床拟诊为脑动脉硬化的患者均行颅脑CTA和31〉TOF-MRA检查，其中23例同时行DSA检查。分析不同影像方法对血管狭窄的显示情况及部位分布。结果：52例患者MRA共显示脑血管狭窄73处，其中Ⅰ～Ⅱ级17处，3处CTA显示相应部位无。狭窄；Ⅲ～Ⅳ级56处，6处CTA显示相应部位无狭窄，13处CTA显示相应部位为Ⅰ～Ⅱ级狭窄；4处MRA显示无狭窄而CTA显示狭窄。23例行DSA检查的患者，MRA诊断脑动脉狭窄42处，DSA诊断相应部位血管狭窄36处，MRA假阳性率为14．3％、过度诊断率为57．1％；CTA显示动脉狭窄37处，CTA假阳性率为2．7％，过度诊断率为29．7％。结论：CTA对脑动脉狭窄具有较高的检出率及诊断符合率，能较真实地反映脑动脉狭窄情况；3D-TOF—MRA简便、无创，可作为筛选脑动脉狭窄的重要手段。

Comparative Study of CT Angiography,MR Angiography and Digital Subtraction Angiography in the Diagnosis of Intracranial Arterial Stenosis

Objective:To study the value of CT angiography(CTA),MR angiography(MRA) and digital subtraction angiography(DSA) in the diagnosis of intra-cranial arterial stenosis.Methods:Fifty-two patients with clinically suspected intra-cranial arteriosclerosis were studied with CTA and 3D-TOF-MRA,twenty-three patients underwent DSA at the same time.The degree of seriousness and location of the stenosis shown by various imaging techniques were analyzed.Results:Of the 52 cases,73 places of stenosis were assessed by MRA,1...