Before you have an MRI, you have to remove your glasses, jewelry, hearing aids, dentures and other items. People who have certain types of medical implants can’t have an MRI. You’ll be asked about your medical history to make sure it’s safe for you. You may be given a gown and hearing protection to wear. Medicine may be used to relax you. You may be given a special dye to drink, or given it through an IV needle or other method. The dye helps the scanner see things in your body more clearly.