X rays are radiation waves that are used to generate images of organs and other structures inside the body. Because of the thickness of our bones, they can take the X ray‘s waves, but tissues like fat, muscle and skin allow more X ray waves to pass through.
In certain X rays, Contrast – a chemical like a dye – is provided for the patient to assist by outlining a specific body region on X ray film. The contrast is white on the X ray film, and produces a sharp outline of structures like the digestive tract and the pathways of arteries. This may be taken orally, a shot into the vein or treated as an enema.