Carotid Ultrasound
In human anatomy, the left and right common carotid arteries are arteries that supply the head and neck with oxygenated blood; they divide in the neck to form the external and internal carotid arteries.

Carotid ultrasonography is an ultrasound-based diagnostic imaging technique to reveal structural details of the carotid arteries, so as to look for blood clots, atherosclerotic plaque buildup, and other blood flow problems.

A carotid duplex is a carotid ultrasonography carried out by duplex ultrasonography. A duplex carotid ultrasound may include a Doppler ultrasound, a special test able to reveal the movement of blood cells through the carotid arteriess.