磁共振弥散成像在急性脑梗死诊断中的应用

目的 探讨磁共振（MR）弥散成像在急性脑梗死的诊断价值。方法 分析48例起病3天内急性脑梗死患者的MR-DWI表现，与常规T1WI、T2WI、FLAIR对照统计分析。结果 急性脑梗死在DWI表现为高信号，本组急性梗死灶在DWI显示达100％，高于T1WI（52．1％）、T2WI（60．4％）、FLAIR（79．2％），差异有统计意义；MR不同序列扫描显示病灶的最早时间分别是T1WI7小时、T2WI7小时、DWI4小时、FLAIR6小时。结论 DWI可以早期明确诊断急性，尤其是超急性期脑梗死，与T2WI及FLAIR压水像相结合，有利于鉴别新旧梗死。

Application of diffusion-weighted imaging in diagnosis of acute cerebral infarction

Objective To investigate the use of Diffusion-weighted imaging(DWI) in the diagnosis of acute(particularly hyper-acute) cerebral infarction.Methods Forty-eight cases of cerebral infarction were scanned with DWI,T_1WI,T_2WI and FLAIR respectively.The results were statistically analyzed.Results Acute infarctions were detected 100% on DWI,statistically higher than on T_1WI(52.1)%,T_2WI(60.4)%,FLAIR(79.2)% respectively.DWI is statistically more sensitive than the other series,especially in hyper-acute patients.The earliest lesions on DWI,FLAIR T_1WI,T_2WI were detected at 4 hours,6 hours,7 hours,7 hours respectively after the onset of the infarction in our study.Conclusion DWI showed to be most sensitive in detecting acute infarction,particularly the hyper-acute cerebral infarction.Combined with T_2WI and FLAIR,DWI is helpful in differentiating acute and chronic lesions.