Digital Radiography and Fluoroscopy Digital Radiography (x-rays) use a small amount of ionizing radiation to produce images of bones and tissue without requiring actual film. X-rays are useful for examining lungs and bone. Fluoroscopy is a type of x-ray imaging used to provide moving images that can be viewed via closed-circuit television monitor. Thus, the radiologist can view specific body parts while they are functioning. Fluoroscopy is especially valuable in evaluating the lower gastrointestinal system.