Ultrasound
Definition:
Ultrasound involves the use of high-frequency sound waves to create images of organs and systems within the body.
How the test is performed:
An ultrasound machine creates images that allow various organs in the body to be examined. The machine sends out high-frequency sound waves, which reflect off body structures. A computer receives these reflected waves and uses them to create a picture. Unlike with an x-ray, there is no ionizing radiation exposure with this test.