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目的研究磁共振(MRI)不同成像序列在诊断大脑中动脉(MCA)主干闭塞中的价值。方法选择发病48h内行头颅MRI检查,并选择磁共振血管成像(MRA)显示单侧MCA主干闭塞的患者作为研究对象,观察T1加权像、T2加权像、FLAIR成像的MCA主干闭塞征象。结果共有41例脑梗死或TIA患者入组,T2WI成像显示侧裂池血管流空影减少和FLAIR成像侧裂池显示等或高信号血管影对MCA主干闭塞的诊断灵敏度较其他3个征象高,分别为78.0%和75.6%,诊断特异度均为100%,两者的诊断正确率较其他3个征象高。结论所有患者至少观察到1个MCA主干闭塞的MRI征象,其中T2WI成像显示侧裂池血管流空影减少和FLAIR成像显示侧裂池等或高信号血管影对MCA主干闭塞的诊断价值高于其他MRI征象。
Objective To study the value of different magnetic resonance imaging (MRI) imaging in the diagnosis of occlusion of the middle cerebral artery (MCA). Methods The cranial MRI was performed within 48 hours of onset and MRA angiography (MRA) was performed in patients with unilateral MCA occlusion. The signs of MCA occlusion in T1 weighted images, T2 weighted images and FLAIR imaging were observed. Results A total of 41 patients with cerebral infarction or TIA were included in the study. The T2WI imaging showed a decrease in scintigraphy and FLAIR imaging fissures, or high signal angiography in diagnosis of MCA occlusion. Compared with other three signs, Respectively, 78.0% and 75.6%, the diagnostic specificity were 100%, the diagnostic accuracy of the two were higher than the other three signs. Conclusions MRI findings of at least one occlusion of the MCA are observed in all patients. T2WI imaging shows a decrease of scintigraphy and scintigraphy, and FLAIR imaging shows that the diagnosis of MCA occlusion is more diagnostic MRI signs.