CT image of the arterial vessel system of the entire pig. Bones, intestines and other tissues were extracted from the image. A, B, and C show examples of vessel casting for a native pig, at 48 hours, and at 120 hours after segmental artery ligation, respectively. A frame around the internal thoracic artery (a) and around the iliolumbar vessel (b) was cropped, and vessel density compared between the groups. We can see an impressive increase in density of small vessels, but no statistically significant differences could be demonstrated with the small number of pigs examined at each time point.