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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。
Objective: To analyze the clinical value of diffusion weighted imaging (DWI) of 0.5T magnetic resonance imaging in the diagnosis of acute cerebral infarction. MATERIAL AND METHODS: Apparent diffusion coefficient (ADC) values of different parts of normal brain tissue were calculated in 50 healthy volunteers. DWI and routine T 1WI, T 2WI and FLAIR were performed on 10 patients 3 to 12 hours after the onset of acute cerebral infarction And MRA examination. Results: The ADC values of normal subjects, top, occipital lobe white matter, centrum oval, basal ganglia, brainstem, cerebellar hemispheres and cerebrospinal fluid were measured. For clinical patients, DWI can clearly show the acute cerebral infarction lesions, conventional T_1WI, T_2WI, FLAIR are not displayed or unclear. CONCLUSION: DWI is the most common method. Combined with T_1WI, T_2WI, FLAIR and MRA sequences, it is very accurate and reliable to diagnose acute cerebral infarction.