Sonography is a diagnostic medical test that uses high-frequency sound waves—also called ultrasound waves—to bounce off of structures in the body and create an image. Fittingly, the test is also referred to as ultrasound or sonogram.
Sonography uses a device called a transducer on the surface of the skin to send ultrasound waves and listen for an echo. A computer translates the ultrasound waves into an image. A trained technician can see, measure, and identify structures in the image.