CT Angiography of the Urogenital System

To ensure the accuracy of the examination, the intake of medications containing heavy metals and the use of gastrointestinal barium examinations must be avoided for a week prior to CT scanning. The patient should take low-residue foods at night before the examination, and 4-h fasting before the procedure. To achieve optimal image contrast for the stomach and duodenum, patients should consume 500–1000 mL of warm water approximately 2 h or 15–20 min prior to the scan, with an additional 200–300 mL of warm water immediately before the examination while lying on the examination bed.