Clinical Research Directory

Inclusion Criteria: * Age≥18 \<100years * Head and neck artery stenosis/occlusion, moyamoya disease, aneurysm, artery dissection, etc., may include patients with acute stroke, chronic cerebral ischemia, and asymptomatic patients. After clinical assessment, CT perfusion imaging is required * The image quality meets the requirements of diagnosis and post-processing * Patients who follow the scanning strategy to complete the examination * The patient or his or her family agrees to provide clinical data and follow-up * Patients or their families sign informed consent forms Exclusion Criteria: * \< 18 years old * People who are allergic to iodine contrast agents, or who cannot be tested temporarily due to taking metformin or aminoglycoside drugs * Renal failure patient * Severe cardiac insufficiency * Severe liver damage * Patients with an expected survival of less than 1 year * Patients with cerebrovascular diseasePregnant woman