Abstract：As a common type of cerebrovascular disease,acute cerebral infarction has higher incidence,mortality and morbidity.Earlier diagnosis and treatment is a key to prevent the development of diseases and improve prognosis.The author mainly focus on the different roles of CT,MRI and MEG in early stage of acute cerebral infarction.CT has high penetration and quick scanning speed and could accurately identify cerebral hemorrhage and infarction,while low precision limits its use in the early diagnosis of acute cerebral infarction.CT perfusion imaging has the advantage of establishing early diagnosis and infarction position.MRI sequence could separate different kinds of tissue edema,which enhances the applied value of diagnosis and installment of acute cerebral infarction.Normal sequences like T1,T2 and FLAIR can detect abnormal signal in several hours after disease onset,while DWI sequence can see signal enhancement after 5min.Latently,SWI sequence is able to find micro bleeding in the area of perfusion after ischemia,which is difficult to be detected by CT or MRI.MRS can exam different metabolisms to find different type cell damage,but it is unable to locate.MEG is used to monitor neurons' abnormal discharge,which even more accurate than EEG.Somatosensory evokedmagnetic fields can help locate infarction area,showing function loss through brain damage at the same time.However,its high price and high degree of patient's adaptability limit its applications.The further development of diagnosis and treatment in acute cerebral infarction will benefit from the progress of neuroimaging.
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2014, Vol. 2 
