A fluoroscopic (real-time) type of X-ray of the small intestine, using a barium-based liquid contrast. The contrast material is infused through a tube that is passed through the nose (or mouth) down into and through the stomach, until the tip reaches beginning of the small intestine, known as the duodenum. X-rays are a form of electromagnetic radiation (like light). They are of higher energy, however, and can penetrate the body to form an image on film. Structures that are dense (such as bone and barium contrast) appear white, less dense things like air will be black, and other structures will be shades of gray. The pictures in an enteroclysis study are displayed on a fluoroscopic monitor (similar to a television screen) in "real time" as the contrast moves through bowel structures. Periodic "still pictures" are used to obtain a film record.