Magnetic resonance imaging (MRI) uses a magnetic field and radio waves to create clear and detailed cross-sectional images of your head and body. You don’t need to prepare for an MRI. Unless otherwise instructed, eat normally (before the procedure) and if you take medications, continue to do so. Once checked in, you’ll likely change into a gown and robe. Remove all accessories, such as your watch, jewelry and hairpins. Also remove things like wigs, dentures and hearing aids. Tell your MRI technologist if you have metal or electronic devices in your body, because their presence may be a safety hazard.