Before the test, patients should inform their doctor of any allergies, pregnancy, or medical conditions that may affect the use of the contrast agent. They may be instructed to avoid eating or drinking anything for a certain period before the test. Patients should also inform their doctor of any medications they are taking, including over-the-counter and herbal supplements, as some may need to be temporarily stopped before the test. They may also be asked to change into a hospital gown and remove any metal objects, such as jewelry or piercings, before the test.