What Is It?
Ultrasound uses sound waves instead of radiation to generate snapshots or moving pictures of structures inside the body.
A radiologist or ultrasound technician places an ultrasound transducer, which looks like a microphone. The transducer sends sound waves into your body and picks up the echoes of the sound waves as they bounce off internal organs and tissue. A computer transforms these echoes into an image that is displayed on a small screen.