Figure 1. Drawings illustrate the value of using water as an oral contrast agent instead of high-attenuation contrast agents when evaluating small bowel disease and enhancement. Drawings A ("unenhanced CT scan") and B ("contrast material-enhanced CT scan") illustrate the results of using a high-attenuation contrast agent, whereas drawings C (unenhanced CT scan) and D (contrast-enhanced CT scan) illustrate the results of using a low-attenuation contrast agent (eg, water). Intraluminal water clearly allows better visualization of the enhancing bowel wall.