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目的探讨低场磁共振弥散加权成像(DWI)以及表观扩散系数(ADC)图像对脑梗死的诊断价值。方法收集经证实的脑梗死68例患者按发病时间分为超急性期(12例)、急性期(13例)、亚急性期(25例)和慢性期(18例),对每例都进行MR的T1-flair、FSE-T2WI、T2-flair、DWI序列扫描及ADC图像重建,分别测量病灶中心和对侧相应脑组织的ADC值。结果低场磁共振DWI和ADC图对超急性期、急性期脑梗死也能做出明确诊断;亚急性期的病灶DWI和ADC图也高于T2-flair、FSE-T2WI序列;对于慢性期的病灶FSE-T2WI高于其它序列,DWI结合ADC图可鉴别新旧病灶。结论低场磁共振DWI和ADC图能对超急性期、急性期、亚急性期的脑梗死做出明确诊断;对慢性期病灶也能做到鉴别诊断,并对超急性期、急性期病灶的诊断敏感性明显高于其它序列。
Objective To investigate the diagnostic value of low field magnetic resonance diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) images in cerebral infarction. Methods Sixty-eight patients with proven cerebral infarction were enrolled in this study. According to the onset time, the patients were divided into two groups: hyperacute phase (12 cases), acute phase (13 cases), subacute phase (25 cases) and chronic phase (18 cases) MRI T1-flair, FSE-T2WI, T2-flair, DWI scan sequence and ADC image reconstruction, respectively, and the lesion center and contralateral brain corresponding ADC values. Results Low-field MR images of DWI and ADC were also able to make a definite diagnosis of hyperacute and acute cerebral infarction. DWI and ADC of subacute lesions were also higher than those of T2-flair and FSE-T2WI. Foci FSE-T2WI higher than other sequences, DWI combined with ADC map to identify new and old lesions. Conclusions DWI and ADC images of low field MRI can make a definite diagnosis of cerebral infarction in hyperacute phase, acute phase and subacute phase, differential diagnosis of chronic phase can also be done, and hyperacute phase, acute phase lesion Diagnostic sensitivity was significantly higher than other sequences.