On the day of your exam, wear comfortable, loose-fitting clothing. Avoid clothing with zippers and snaps as metal objects can affect the image. Depending on the part of the body that is being scanned, you may also be asked to remove hair pins, jewelry, eyeglasses, hearing aids and any dentures. You may be asked not to eat or drink anything for one or more hours before the exam. Women should inform their doctor or x-ray tech if there is any possibility that they are pregnant.