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Application of MR Diffusion Weighted Imaging in the Differential Diagnosis Between Encephalitis and Acute Cerebral Infarction

黄仲奎，邓德茂，龙莉玲，秦宇红

（广西医科大学第一附属医院放射科，广西 南宁 530021）

HUANG Zhong－kui，DENG De－mao，LONG Li－ling，QIN Yu一hong

（Depa rtment of RadioIogy the First Affiliated Hospita1 of GuanAxi Medica1 University Nanning 530021，China）

Abstract

　　Objective：To explore the diagnostic value of MR diffusion weighted imaging （DWI）in the differential diagnosis between encephalitis and acute cerebral infarction.

　　Methods：The MR DWI appearances of 23 cases of encephalitis including 14 cases with viral encephalitis，9 cases with demyelinative encephalitis and 30 cases of acute cerebral infarction were retrospectively analyzed.

　　Results：The 30 cases of acute cerebral infarction appeared bright signal in DWI with a ADC values of （0.46±0.13）×10－3mm²/s. 7 cases with viral encephalitis and 9 cases with demyelinative encephalitis appeared slightly high or high signal intensity in DWI with a ADC values of（0.98±0.18）×10－3mm²/s and（0.89±0.07）×10－3mm²/s respectively. The ADC values of viral encephalitis and demyelinative encephalitis were higher comparing to acute cerebral infarction（p<0.01）and normal parenchyma（p<0.05）.But there is no significant difference between viral encephalitis and demyelinative encephalitis（p>0.05）.However， the ADC values shown higher or lower in different areas in 4 cases， and lower ADC values appearing in 3 cases with viral encephalitis comparing normal parenchyma.