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This scan allows the radiologist to take pictures of different levels, or slices, of the body using a rotating X-ray beam. The radiologist is able to view each slice to check for injuries or abnormalities, organ size and shape. This exam may include injecting an iodine substance in the vein. Diabetic patients and those with allergies must inform the radiology staff and may need clearance from their doctor before the exam. Blood tests may also be required prior to the administration of contrast materials. Patients whose exam includes an injection may not eat or drink anything four hours before the test. During the injection, the patient may experience a warm sensation throughout the body and a metal taste in the mouth. This is normal. If the scan includes the abdomen or pelvis, the patient may be asked to drink a barium sulfate solution 60 to 90 minutes before the exam to fill the intestinal tract. This is not required if only a chest CT scan is being done. If barium sulfate is required, the patient is given another cup of the liquid to drink before lying down on the exam table. For short periods of time the body may be covered by the scanner, but the scanner is open at the back and the front, allowing the patient to see out. The technologist is always able to see and hear the patient during the 30-minute procedure. Following the exam, the patient must drink plenty of fluids for 24 to 48 hours.
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