脑出血扩散加权磁共振表现

目的 观察脑出血不同时期扩散加权(DWI)磁共振表现.方法 根据患者发病时间与磁共振检查间隔时间,将22例脑出血患者分为5组,其中超急性期3例;急性期3例;亚急性早期5例;亚急性晚期7例;慢性期4例.回顾性分析各组患者的常规及扩散加权磁共振表现.结果 DWI显示超急性期及亚急性晚期两组血肿呈高信号;急性期、亚急性早期及慢性期血肿呈低信号.超急性期血肿边缘可见低信号环;超急性期、急性期及亚急性早期血肿周边可见高信号环.结论 脑血肿各时期DWI表现有其独特的特点.DWI是鉴别脑血肿和脑梗死的重要手段.

Diffusion-weighted MR imaging of intracerebral hemorrhage

Objective To observe the DWI features of intracerehral hemorrhage(ICH)at different evolving stages.Meth- ods Twenty-two patients with ICH underwent DWI.According to the time interva[ between symptom onset and initial MRI,five stages were categorized,i.e.hyperacute(n=3);acute(n=3),early subacute(n=5),late subacute(n=7)and chronic(n=4).T1 and T2 weighted imaging of these cases were reviewed.Results Hematomas were hyperintense at the hyperacute and late subaeute stages,and hypointense at the acute,early subaeute and chronic stages on DWI.Focal hypoin- tensity was observed invariably within a hyperacute hematoma.At the hyperaeute,acute and early subaeute stages,hyperin- tense rims surrounding the hematoma were present.Conclusion ICH has different characteristic DWI features at different stages.DWI can be helpful to the differentiation of hemorrhage from isehemia.