An MRI is a diagnostic procedure that uses large magnets, radio frequency pulses and a computer to produce detailed images of organs and structures within the body.

A computed tomography scan (CT or CAT scan), is a diagnostic imaging procedure that uses a combination of X-rays and computer technology to produce cross-sectional images (often called slices) of the body.

An ultrasound, also called sonography, is a diagnostic imaging exam that uses a small transducer (probe) and ultrasound gel to expose the body to high-frequency sound waves to create images of blood vessels, tissues and organs.

An X-ray is a diagnostic test that uses small doses of radiation to produce images of internal tissues, bones and organs onto film.