Transcranial Color Doppler (TCD) is an ultrasound examination of the blood vessels of the neck that is used to analyze the circulation of vertebral arteries and basilar arteries - vertebrobasilar basin (TCD VB basin) as well as to analyze the circulation of other blood vessels of the brain.

Examination of intracranial arteries are indicated for all patients who have undergone TIA (transient ischemic attack) or stroke, patients with high risk for cerebrovascular disease, patients with suspected subclavian stenosis, patients with suspected central cause of dizziness, patients with degenerative diseases of the cervical spine with dizziness, uncear headaches, and patients with suspicion of aneurysm of Willis's artery and AV malformation.

The examinations includes an overview of the blood vessels of the neck and head and, as well as the ultrasound of the neck's blood vessels (colore doppler)  is harmless, painless, non-invasive for the patient, and, if necessary, can be repeated without any health risks.