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Prior to the procedure you may be asked to abstain from eating or drinking. The procedure is painless and requires the patient to lie as still as possible on a table that is guided into a machine that resembles an enormous doughnut. The machine, called a gantry, directs small doses of electromagnetic radiation toward the body from various angles. Although an abdominal scan can usually be completed in a single breath, about 10 seconds or less, the entire procedure may last 5 to 30 minutes.
