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Any material used in imaging studies such as x-rays, MRIs, and CT scans to help outline the body parts being examined. These may be injected into a vein or you could drink it. Some people can have reactions to radiocontrast dye so before the procedure, let your doctor and the technologist know if you have any allergies or have had a reaction to radiocontrast dye. Also called dye, contrast dye, or radiocontrast medium.