Ultrasound

(UL-truh-SOWND) A procedure in which high-energy sound waves (ultrasound) are bounced off internal tissues or organs and make echoes. The echo patterns are shown on the screen of an ultrasound machine, forming a picture of body tissues called a sonogram. Also called ultrasonography.

(ul'truh-sound) mechanical radiant energy. Ultrasonography allows the visualization of deep structures of the body by recording the reflections of (echoes of) pulses of ultrasonic waves directed into the tissues. For more information, see Ultrasound.