All the patients, who had fasted at least eight hours prior to the MDCT gastrography, received 10 mg of butyl scopolamine (Buscopan, Boehringer Ingelheim, Seoul, Korea) intravenously to decrease bowel peristalsis and to facilitate hypotonia, and they received 6 g of effervescent granules (Top, Taejoon Pharmaceuticals, Kyungkido, Korea) with 10 mL of water to achieve gastric distension just before CT. CTG was performed using a 16-MDCT scanner (Somatom Sensation 16, Siemens, Erlangan, Germany). The CT parameters included 16×0.75 mm detector configuration, 120 kVp, 120 mAs, 15 mm/sec table feed and 1-mm reconstruction with a 30% overgap. After ensuring adequate gastric distension on the scanogram, the arterial and delayed phase scans were obtained from the diaphragmatic dome to the lower edge of the stomach. The portal phase scans were obtained from the diaphragmatic dome to the symphysis pubis.
Triphasic CT scans were performed during the arterial phase (start of delay: 30 seconds) with the patient in the LPO position, during the portal phase (72 seconds) with the patient in the supine position and during the delayed phase (150 seconds) with the patient in the prone position after injection of 120 mL of nonionic contrast material (Ultravist; Schering, Berlin, Germany) at 4 mL/sec via the antecubital vein by using a 18-gauge needle and an automatic injector. The LPO position was performed by placing a pillow at the patient's back.
Triphasic CT scans were performed during the arterial phase (start of delay: 30 seconds) with the patient in the LPO position, during the portal phase (72 seconds) with the patient in the supine position and during the delayed phase (150 seconds) with the patient in the prone position after injection of 120 mL of nonionic contrast material (Ultravist; Schering, Berlin, Germany) at 4 mL/sec via the antecubital vein by using a 18-gauge needle and an automatic injector. The LPO position was performed by placing a pillow at the patient's back.
