磁共振弥散加权成像在脑病变诊断中的应用价值

目的 评价磁共振弥散加权成像（DWI）在脑部病变诊断中的应用价值。材料与方法 对110例不同脑部病变（包括脑梗塞、脑出血、脑肿瘤、脑白质病变）的DWI图像以及同一病变在不同扫描序列之间进行比较分析。结果 DWI对急性、超急性脑梗塞高度敏感（达100％），对急性出血性脑梗塞也很敏感，对脑肿瘤的敏感性（75％）低于T2／Flair(92％），对脑白质病的敏感性低于T2／Flair，但可显示部分多发性化的活动病灶，对急性脑出血敏感性较差。结论 DWI能诊断常规MR序列不能显示的超急性期和急性期梗塞，对急性出血性脑梗塞的诊断也很有价值。能区别急性期和慢性期脑梗塞。还有助于脑肿瘤、脑白质病变的和鉴别诊断。

The Value of MR Diffusion Imaging in Diagnosing Brain Lesions

Objective To evaluate diffusion weighted imaging (DWI) in the diagnosis of encephalic diseases.Materials and Methods DWI features in 110 patients with different brain lesions, including cerebral infarction, hemorrhage, multiple sclerosis and tumors, were analyzed, and comparison with SE T 1, FSE T 2, FLAIR and enhanced T 1 was made.Results DWI was 100% sensitive to hyper acute and acute brain infarct, and was quite sensitive to acute hemorrhagic infarct. For subacute and late subacute infarct the sensitivity was 70%. The sensitivity for brain tumor, multiple sclerosis and acute demyelination was 73%, 45% and 33%, respectively.Conclusion DWI is a useful MR technique, which is superior to conventional MR sequences in revealing the hyper acute, acute or hemorrhagic infarctions. It is helpful in differentiating acute from chronic cerebral infarctions, and also helpful in the diagnosis and differentiation of cerebral tumors and multiple sclerosis.