Figure 1.

 (A) A 38 year old volunteer undergoing magnetic resonance colonography in conjunction with rectal application of water. The coronal source image of T1 weighted three dimensional GRE (TR/TE 3.1/1.1) scan acquired prior to intravenous application of contrast medium shows moderate contrast between bowel wall and bowel lumen. (B) Coronal source images of the same volunteer acquired 75 seconds after intravenous administration of gadolinium. The colonic wall enhances brightly and can be easily delineated against the background of a dark water filled colonic lumen. (C) Transverse colon of the same volunteer. The colonic wall shows a normal thickness (2 mm) (arrow), contrast uptake (contrast to noise ratio 42), and number of haustral folds (14) (arrow).