弥散加权成像对急性期脑梗死的诊断价值

目的 探讨磁共振弥散加权成像(DWI)对急性脑梗死的诊断价值.方法 对临床上拟诊为急性脑梗死患者进行常规磁共振成像(MRI)扫描及DWI检查.回顾性分析60例在T2WI、T1WI、DWI、表现弥散系数(ADC)图上信号强度的变化.结果 发病3h内(6例)在T2WI上呈稍高信号2例,等信号4例,T1WI上均为等信号,DWI上均为高信号,ADC图上均为明显低信号；发病4～15 h(30例)在T2WI、DWI上均为稍高到高信号,在T1WI、ADC图上均为低信号；发病16～24 h(12例)T2WI 、DWI上均为高信号,在T1WI上11例为低信号,1例为等低信号,ADC图上,9例为低信号,3例为等低信号；发病24 h上(12例)在T2WI上均为稍高信号；DWI上10例为稍高信号,2例为等信号,T1WI上10例为稍低信号,2例为等低信号,ADC图上,5例为稍低信号,3例为等信号,4例为等低信号.结论 弥散加权成像能早期显示急性脑梗死的病灶,对急性脑梗死有非常重要的诊断价值.

The diagnostic value of MR diffusion-weighted imaging to acute cerebral infarction

Objective To evaluate the diagnostic value of diffusion weighted imaging of MRI(DWI) to the acute cerebral infarction.Methods The conventional magnetic resonance imaging(MRI) and DWI and apparent diffusion co-efficient(ADC) were performed in 60 patients after cerebral infarction.T2WI,T1WI,DWI images and ADC mapping were analyzed.Results After the onset,in the first 3 h(6 cases) T2WI showed slightly high signal intensity(2 case),iso-signal intensity(4 cases),T1WI showed all iso-signal intensity,DWI showed slightly all high signal intensity,ADC showed all obvious low signal intensity.In 4-15 h(30 cases) T2WI and DWI showed all high to high signal intensity,T1WI and ADC mapping showed all low signal intensity.In 16~24 h(12 cases) T2WI and DWI showed all high signal intensity,T1WI showed low signal intensity(11 cases) and iso-low signal intensity(1 cases),ADC mapping showed low signal intensity(9 cases) and iso-low signal intensity(3 cases).In 24 h(12 cases) T2WI showed all slightly high signal intensity,DWI showed slightly higher signal intensity(10 cases) and iso-signal intensity(2 cases),T1WI showed slightly low signal intensity(10 cases) and iso-low signal intensity(2 cases),ADC mapping showed slightly low signal intensity(5 cases),iso-signal intensity(3 cases) and iso-low signal intensity(4 cases).Conclusion The lesions of acute cerebral infarction can be showed by diffusion-weighted imaging at early stage.And the diagnostic value of diffusion-weighted imaging to acute cerebral infarction is very important.