Small capillary blockage that occurs within 24 hours may not show up on CT, so a cerebral infarction can usually not be ruled out, and an MRI of the brain is needed to help rule out a cerebral infarction.
Generally, CT examination of the brain is performed 24 hours after the onset of cerebral infarction, and at this time, no obvious lesions are shown on CT, which may exclude cerebral infarction. However, for patients suspected of having a cerebral infarction, an MRI of the brain is also needed. Because brain MRI can find early atherosclerotic cerebral infarction of cerebral infarction lesions, can help determine whether there is a cerebral infarction.
Brain infarction to do brain CT examination is normal, usually can not be used as a standard to exclude brain infarction. For patients suspected of having a cerebral infarction, they need to consult a doctor in a timely manner, who will combine the results of other relevant tests such as MRI of the brain and the patient’s performance to determine whether or not a cerebral infarction has occurred.