Patients who want to have a head examination need to consult a neurologist. Head examinations for cerebrovascular disease commonly include head CT, head MRI scan, head MRI diffusion imaging, and functional brain imaging. 1. If the patient is considered to have cerebrovascular disease, cerebral vascular stenosis, or insufficient blood supply, the patient should have a preliminary examination of transcranial Doppler and cervical vascular ultrasound, and if necessary, CTA imaging of the blood vessels in the head.