0.5T磁共振机弥散加权像诊断急性脑梗塞

目的：分析０．５Ｔ磁共振机的弥散加权像（ＤＷＩ）对急性脑梗塞诊断的临床价值。材料与方法：计算５０例健康志愿者正常脑组织各不同部位的表观弥散系数（ＡＤＣ）值，并对急性脑梗塞发作后３～１２小时的１０名患者进行ＤＷＩ及常规Ｔ_１ＷＩ、Ｔ_２ＷＩ、ＦＬＡＩＲ及ＭＲＡ检查。结果：测得正常人额、顶、枕叶脑白质、半卵圆中心、基底节、脑干、小脑半球、脑脊液部位的ＡＤＣ平均值。对于临床患者，ＤＷＩ可明确显示急性期脑梗塞病灶，常规Ｔ_１ＷＩ、Ｔ_２ＷＩ、ＦＬＡＩＲ均不能显示或显示不清。结论：以ＤＷＩ为主，结合Ｔ_１ＷＩ、Ｔ_２ＷＩ、ＦＬＡＩＲ及ＭＲＡ序列能非常准确、可靠的诊断急性脑梗塞。

Diagnoses of Acute Cerebral Infarction by Using Diffusion - weighted Imaging 0.5T Magnetic Resonance Scanner

Purpose: To evaluate the value of diffusion weighted imaging (DWI) in detecting acute cerebral infarction on 0.5T magnetic resonance machine. Materials and Methods: Apparent diffusion coefficient (ADC) value of different parts of normal brain tissue were calculated in 50 healthy volunteers. DWI. routine T_1 .T_2WI. FLAIR and MRA were performed in 10 patients with cerebral infarction (the time after onset of stroke: 3 - 12 hours). Results: In normal subjects, the average ADC values were obtained in the parietal. frontal. occipital white matter. centrum semiovale. hasal ganglia. brain stem. cerebellar hemisphere. cerebrospinal fluid. For the clinical patients, in the acute stage of cerebral infarction, infarcts were not seen on T_1WI . T_2WI. FLAIR except diffusion - weighted imaging. Conclusion: DWI, especially combined with T_1WI.T_2WI. FLAIR and MRA, is a reliable method for the diagnosis of acute cerebral infarction.