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脑出血为什么需要做核磁共振检查 张春志 吉林省脑科医院 脑出血为什么需要做核磁共振检查,核磁共振,对诊断缺血性脑血管疾病,较敏感,不仅发现病灶早,而且对小梗死灶,尤其是对脑干,和小梗死灶的诊断,是CT不能替代的,核磁共振和CT比较,还有以下优点,核磁共振,对梗死区的水肿的改变较敏感,故可较早地显示梗死灶,一般发病后1到2小时,做核磁共振检查,就可能显示信号较强的,病变特征,而CT却往往需要等24小时,才能见显影,过早检查成为阴性,核磁共振对腔隙性脑梗死,显示优于CT,CT只能扫描横的面,而核磁共振还能从室纵面,冠纵面上探查,所以对于10毫米以下的,强行性脑梗死,CT往往无能为力,而核磁共振,对直径2毫米以上的病灶,即可显示,CT难以显示后颅窝,尤其是脑干病变,而核磁共振对检查,后颅窝的脑梗死,具有更重要的意义。 Why MRI is needed for cerebral hemorrhage Why does cerebral hemorrhage need MRI, Nuclear magnetic resonance, For the diagnosis of ischemic cerebrovascular disease, More sensitive, It was not only found early, And for small infarcts, Especially for the brain stem, And diagnosis of small infarcts, CT can't replace it, Comparison of MRI and CT, There are also the following advantages, Nuclear magnetic resonance, It is sensitive to the change of edema in infarct area, So it can show the infarct earlier, Generally, 1 to 2 hours after onset, Do an MRI, It may show that the signal is strong, Pathological characteristics, But CT often needs to wait 24 hours, To see development, The test was negative too early, MRI for lacunar infarction, Better than CT, CT can only scan the transverse plane, And MRI can be done from the longitudinal side of the chamber, On the longitudinal plane of the crown, So for those under 10 mm, Forced cerebral infarction, CT is often powerless, And nuclear magnetic resonance, For lesions more than 2 mm in diameter, It will be displayed, CT is difficult to show posterior fossa, Especially brainstem lesions, And nuclear magnetic resonance examination, Cerebral infarction in posterior fossa, More important.