A device that produces sound waves that bounce off body
tissues and make echoes. The transducer also receives the echoes and sends them to a computer
that uses them to create a picture called a sonogram. Transducers (probes) come in
different shapes and sizes for use in making pictures of different parts of the body. The
transducer may be passed over the surface of the body or inserted into an opening such
as the rectum or vagina.