Duplex ultrasound combines Doppler flow information and conventional imaging information, sometimes called B-mode, to allow physicians to see the structure of your blood vessels. Duplex ultrasound uses sound waves to get images of your blood vessels. It also helps determine how fast blood moves through the vessels. It can also be useful to estimate the diameter of a blood vessel as well as the amount of obstruction, if any, in the blood vessel. Using duplex ultrasound technology, the structure of your blood vessels, the valve function, the movement of your red blood cells and direction of blood flow through the vessels, and any blockages or blood clots can be seen.
Diseases of the blood vessels can affect both veins and arteries.