Current applications of duplex ultrasonography and color Doppler imaging.

Duplex ultrasound is a noninvasive method of evaluating the function of the systemic arteries and veins. In this review, the physical principles of duplex ultrasonography are discussed and compared to other available noninvasive tests. The clinical applications of duplex ultrasound and color Doppler imaging are reviewed and diagnostic criteria stated. Newer and more controversial applications of duplex ultrasound are presented.