Fluoroscopy is a special form of x-ray that involves exposing a part of the body to a small dose of ionizing radiation to produce pictures of the inside of the body. X-rays are the oldest and most frequently used form of medical imaging.

Fluoroscopy makes it possible to see internal organs in motion. For instance, when the gastrointestinal tract is coated with barium, the radiologist is able to view and assess the anatomy and function of the pharynx, esophagus, stomach and the duodenum.