Carotid ultrasound uses sound waves to produce pictures of the carotid arteries in the neck which carry blood from the heart to the brain. It is particularly used to diagnose possible narrowing of the carotid artery in your neck.
Your technician puts gel on your neck to help sound waves pass through your skin. The probe (transducer) is passed across your neck. The Doppler ultrasound evaluates blood flow through the carotid artery. It can, for example, pick up irregularities in the blood vessel walls.
This test is usually done in combination with the echocardiogram. Together, these tests take about 20 to 30 minutes.