The common medical imaging methods for cerebral infarction are cranial CT and cranial magnetic resonance imaging (MRI). Cerebral infarction with an onset time of more than 24 hours generally appears as a low-density foci on cranial CT, while acute cerebral infarction with an onset time of less than 24 hours has no obvious shadow on cranial CT. The presentation of cerebral infarction on cranial MRI scan is different depending on the MRI sequence. T1 image shows low signal shadow; T2 image shows high signal shadow; acute cerebral infarction shows high signal shadow on DWI image; ADC image shows low signal shadow; in addition, according to the different stages of cerebral infarction, the infarct lesion also shows different signal transformation. After an acute cerebral infarction, patients are recommended to further evaluate cerebral artery CT (CTA) or cerebral artery MRI (MRA) actively to further assess the sclerosis and stenosis of cerebral vessels.