Ultrasound or ultrasound is a type of image. It uses high-frequency sound waves to look at organs and structures inside the body. Health care professionals use them to view the heart, blood vessels, kidneys, liver, and other organs. During pregnancy, doctors use ultrasound tests to look at the fetus. Unlike x-rays, ultrasound does not expose you to radiation.

During the test, you lie on a table. A special technician or doctor moves a device called a transducer over a part of the body. The transducer sends sound waves that bounce off the tissues inside the body. The transducer also captures the bouncing waves. The ultrasound machine creates images of these sound waves