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Carotid Doppler is an imaging test that uses ultrasound to examine the carotid arteries located in the neck. This test can show narrowing or possible blockages due to plaque buildup in the arteries due to coronary artery disease. The carotid arteries are the major blood vessels on each side of your neck, responsible for carrying blood from your heart to your brain. Carotid Doppler or ultrasound is a painless and safe test that your doctor will use to look for any narrowing or blockage that may increase your risk of stroke. These arteries are usually blocked by a buildup of plaque made up of fat, cholesterol, and other substances.