Carotid Ultrasound and Transcranial Doppler

A carotid ultrasound is a test that provides images of the carotid arteries in the neck, telling us how much blood flows through them and how fast it travels. Ultrasound waves are used to make an image of the arteries that can be used to detect abnormalities and blockages that may lead to stroke. Physicians often request carotid ultrasound for patients who have had a stroke or who might be at high risk for a stroke. This test is not necessary if a CT angiogram has been performed unless there is a question that requires a second mode of evaluation.

A transcranial Doppler (or TCD) test also uses ultrasound, but it focuses on the evaluation of flow in the major arteries inside the skull.