People will be asked about allergies to iodine, which is in the dye. Women will also be asked if they may be pregnant. All jewelry and metal objects must be removed to avoid interfering with the images. This exam can cause claustrophobia, which is the uncomfortable feeling you may have from being in a small place. A claustrophobic person may require a sedative before the exam. X-ray department staff will tell the person if other preparations are needed.