X-RAY / FLUOROSCOPY X-ray use invisible electromagnetic energy beams to produce images of internal tissues, bones and organs on film. Standard x-rays are performed for many reasons, including diagnosing tumors or bone injuries. When the body undergoes x-rays, different parts of the body allow varying amounts of the x-ray beams to pass through. The soft tissues in the body (such as blood, skin, fat, and muscle) allow most of the x-ray to pass through and appear dark gray on the film. A bone or a tumor, which is denser than the soft tissues, allows few of the x-rays to pass through and appears white on the x-ray. At a break in a bone, the x-ray beam passes through the broken area and appears as a dark line in the white bone. Fluoroscopy is a study of moving body structures - similar to an x-ray "movie." A continuous x-ray beam is passed through the body part being examined, and is transmitted to a TV-like monitor so that the body part and its motion can be seen in detail. Fluoroscopy is used in many types of examinations and procedures, such as barium x-rays. In barium x-rays, fluoroscopy allows the physician to see the movement of the intestines as the barium moves through them.