Before the MRI, patients may be asked to remove all metal objects from their body, as these can interfere with the magnetic field of the machine. Additionally, patients may be asked to avoid eating or drinking for a few hours before the test.The contrast material is usually given to the patient through an intravenous (IV) line, which requires the placement of a needle in the patient’s arm. Patients should inform their doctor if they have any allergies or kidney problems before receiving the contrast material.