Cerebrovascular ultrasound is also known as intracranial segmental Doppler, the cost of the examination ranges from 100-120 yuan, which is related to the level of the hospital. Cerebrovascular color ultrasound examination can mainly check the general condition of intracranial willis ring blood vessels, through the blood vessel pulsation index as well as the blood flow velocity, the preliminary assessment of the existence of atherosclerosis, as well as the existence of insufficient cerebral blood supply or vascular deformity and so on. Cerebrovascular ultrasound is only a preliminary assessment of the vessels in the intracranial segment. If abnormalities are found, CT angiography or magnetic angiography can be further investigated, and cerebral angiography can also be performed if necessary. If the patient has an aneurysm, it is also possible to carry out clamping surgery under the imaging, etc. The most authoritative examination for cerebral blood vessels is cerebral angiography.