Figure 4a:

(a) Transverse gray-scale US scan through the pelvis of a rat in the acute inflammation cohort with 0% applied strain shows marked bowel wall thickening in the region of rectosigmoid colon (arrows). White line is the distance between the skin surface and bony pelvis, and changing this distance is used to alter the amount of applied strain. * = Uterus. (b) ARFI elastography–derived image displays soft-tissue SWV measurements as a color elasticity map. Example 1.5-mm² ROIs are within the bowel wall. Arrows were placed along serosal surface of the bowel wall by using real-time gray-scale imaging immediately prior to SWV image acquisition to guide ROI placement for SWV measurement.