The cost of the cranial CTA examination is 1352.6 RMB. The examination requires the injection of a bottle of contrast agent, and the price of ordinary contrast agent is 300-400 RMB, and the total cost is more than 1700 RMB. The cranial CTA is mainly to show the blood vessels in the skull and check for any abnormalities in the intracranial blood vessels, such as whether there are obvious aneurysms, smog, arteriovenous malformations, etc. Generally for patients with subarachnoid hemorrhage, neurosurgery clinicians will prefer to do cranial CTA to exclude whether there is an aneurysm. If the patient has an aneurysm, interventional treatment or surgical aneurysm clamping can be chosen for treatment according to the situation.