中风前几个小时 ,仍然选择ＣＴ影像特征来鉴别基本的病理改变。ＣＴ常用来排除脑出血、脑肿瘤和脑炎 ,也可发现脑梗死的早期影像表现 ,估计梗死范围。早期ＣＴ显示脑梗死低密度区超过大脑中动脉供血区的 1/ 3 ,作为排除静脉内血栓溶解的标准。再出血取决于已经不可逆损伤的组织 A few hours prior to the stroke, CT imaging features were still selected to identify the underlying pathological changes. Commonly used to rule out cerebral hemorrhage, brain tumors and encephalitis, CT can also be found in early performance of cerebral infarction, assessment of infarct size. Early CT showed that the low-density area of ​​cerebral infarction exceeded the middle cerebral artery area by 1/3, as a standard for excluding intravenous thrombolysis. Rebleeding depends on the tissue that has been irreversibly damaged