Experienced radiologists have emphasised the importance of using positive oral contrast material for abdominal CT for proper distension of the stomach and bowels and visualisation of any gastrointestinal masses or mural thickening, whether the lesion is of benign or malignant nature. Therefore, suspensions of diluted barium sulphate or iodinated solution are commonly administrated to patients before CT.Using hyper dense oral contrast agents has many limitations because of overshooting artifacts from intraluminal air-fluid interface. Moreover, movement due to peristalsis, partial filling of the lumen and incomplete distension of the gastric wall often mimics focal thickening of the gastric wall and further decreases image quality With the advent of helical CT which couples fast data acquisition and timed rapid intravenous contrast infusion the walls of the stomach and bowels enhance significantly. Subtle mural abnormalities or alterations in wall enhancement may be obscured by positive oral contrast medium within the adjacent lumen.In examining the gastric wall, helical CT also has limitations, caused by peristalsis, beam hardening artifacts and suboptimal gastric distension, therefore, hypotonia and contrast filling are important with any type of equipment. The use of water, a neutral agent 0-10HU, would avoid these problems. Water is particularly suited for use as a gastric contrast agent because it is well tolerated and results in good gastric distension.