Cerebral insufficiency. Brain CT?

A CT scan of the head of a patient with insufficient blood supply to the brain would not be able to detect it. If the patient showed insufficient blood supply to the brain, it would indicate intracranial vascular stenosis caused by various causes. The patient's brain tissue would show a decrease in blood function, but it had not yet reached cerebral infarction. A CT scan of the head would not be able to detect it. However, a patient with insufficient blood supply to the brain would show dizziness, head swelling, numbness of the limbs, and other discomfort. We could do a MRI scan of the head. In particular, MRA of the skull can be done to find the pathological changes of the patient's blood vessels. In addition, perfusion magnetic resonance imaging of the skull can be done to observe whether there is ischemia in the brain tissue of the patient's skull.