What is cervical Doppler used for: 1. Cervical Doppler uses ultrasound to examine the condition of intracranial vessels through the skull, which can diagnose the presence of stenosis and occlusion of intracranial vessels, and can follow up after treatment of intracranial vessels. 2. Cervical Doppler can also detect cerebral edema, and patients with cerebral edema can be monitored by cervical Doppler, which can detect changes in cerebral edema. 3. Cervical Doppler can also diagnose cerebral atherosclerosis and assess the degree of atherosclerosis.4 It can detect the presence of intracranial cerebral arteriovenous malformations and arteriovenous fistulas, and can diagnose ischemic cerebrovascular disease and follow up after treatment.5 Cervical Doppler can also be used to monitor cerebral blood flow and monitor patients for the presence of microemboli.