Figure 4. a, b.

Example of wall thickness measure. Coronal (a) and axial (b) contrast-enhanced CT images. The longitudinal centerline of the colon is identified (dotted line). Measurements are made perpendicular to the centerline, excluding abscess and lumen (solid line). Wall thickness is measured with an electronic caliper in the clinical picture archiving and communications system to identify the maximum distance from the serosal-to-mucosal surface of the colon, including the folds and teniae coli (a). In situations where a lumen could not be clearly seen, the entire serosa-to-serosa distance was measured and divided in half (b).