Ultrasound cannot see tiny brain infarcts. Ultrasound can see if there are stenosis, microemboli, etc. Brain infarcts need to be examined by CT or MRI, etc. 1. Ultrasound (1) It can determine the shape of blood vessels to observe whether there is any stenosis, etc. If the degree of stenosis is more than 50%, oral medication such as atorvastatin, aspirin or interventional therapy should be chosen according to the patient’s condition. (2) Ultrasound can also be used to determine the presence of microemboli, to observe the condition at an early stage, and to actively prevent and treat the condition. 2. CT or MRI examination: CT or MRI examination can clarify the small cerebral infarction foci and observe the location of cerebral infarction and the size of cerebral infarction area, etc. When cerebral infarction occurs, it is necessary to go to the hospital. When cerebral infarction occurs, it is necessary to go to the hospital for timely consultation and improve the examination and treatment under the guidance of the doctor, and do not blindly self-medication, so as to avoid delaying the condition.