A carotid Doppler ultrasound is a non-invasive test that measures the blood that flows through the carotid arteries, which supply blood to the brain. The large carotid arteries often narrow as a result of arteriosclerosis. A carotid Doppler ultrasound may be ordered if you have suffered from a stroke before or are at increased risk of having a stroke, as it is an important stroke prevention tool.

To perform a carotid Doppler ultrasound, an ultrasound technician will apply a special gel to both sides of your neck and then move a hand-held ultrasound sensor back and forth over your neck. The sensor will generate high frequency sound waves that are processed into images on a computer monitor. These images allow us to measure blood flow and detect changes in frequency. In areas where the arteries are narrowed, there will be variations in blood flow.

No special preparation is necessary for the carotid Doppler ultrasound, but you should allow at least one hour for the test. The ultrasound technician will record the test on videotape and Dr. Stevens will review the images to determine if the carotid arteries have narrowed and then determine appropriate treatment.