Vascular ultrasound is a noninvasive diagnostic tool that helps examine blood circulation in the arms and legs. This imaging test may be performed on patients at risk of arterial blockages and other venous diseases. During the procedure, a vascular technician uses an ultrasound device to emit high-frequency sound waves throughout the body’s tissues. Echoes from the ultrasound are then transformed into videos or images, which the vascular technician uses to determine a diagnosis and possible treatment options. Vascular ultrasounds do not require the use of needles, dyes, radiation, or anesthesia.