后循环缺血性眩晕的影像学表现特点及诊断分析

Imaging Findings and Diagnosis of Posterior Circulation Ischemic Vertigo

目的分析后循环缺血性眩晕的磁共振弥散成像(MRI)影像学表现特点,并探讨其诊断价值。方法选择我院收治的后循环缺血性眩晕患者100例,均进行MRI常规扫描和弥散加权成像(DWI)扫描,分析后循环缺血性眩晕的影像学表现特点,并与经颅多普勒(TCD)检查结果进行比较,探讨其诊断价值。结果100例患者MRI显示后循环供应部位脑实质病变84例,短暂性脑缺血发作16例,其中脑实质病变患者T2 FLAIR、T2WI均呈片状高信号,T1WI呈低信号,DWI呈高信号,ADC图呈低信号。短暂性脑缺血发作患者T2 FLAIR、T2WI未见异常,ADC图信号高于梗死患者。MRI检查显示异常率为84.00%,高于TCD检查的72.00%(P<0.05)。结论后循环缺血性眩晕在MRI检查中具有特征性表现,MRI-DWI扫描对脑缺血后组织损伤诊断具有重要价值。

Objective To analyze the magnetic resonance imaging(MRI)findings of posterior circulation ischemic vertigo(PCIV)and its diagnostic value.Methods One hundred patients with PCIV in the hospital were scanned with conventional MRI and diffusion-weighted imaging(DWI)to analyze the imaging findings of PCIV.The findings were compared with results of transcranial color Doppler(TCD)examination to explore its diagnostic value.Results MRI of 100 patients showed 84 cases of parenchymal lesions in posterior circulation supply area and 16 cases of transient ischemic attack.Among them,T2 FLAIR and T2WI of patients with parenchymal lesions showed patchy high signal,T1WI showed low signal,DWI showed high signal,and ADC image showed low signal.T2 FLAIR and T2WI of patients with transient ischemic attack showed no abnormality,and the ADC signal was higher than that of patients with infarction.MRI examination showed an abnormal rate of 84.00%,higher than 72.00% of TCD examination(P<0.05).Conclusion MRI findings of PCIV are characteristic.MRI-DWI scan is of great value in the diagnosis of tissue injury after cerebral ischemia.