Representative positron emission tomography-images of dynamic whole body acquisitions of a series of an allogeneically transplanted rat [postoperative day 1 (A), 2 (B), 4 (C), and 7 (D)], after tail vein injection of 30 MBq 18F-fluordeoxyglucose (maximum a posterior projection, 180 min pi). While the allograft undergoing rejection shows distinct enhancement of 18F-FDG (yellow circle) the native control kidney without rejection does not (green circles). Figure taken from[44]. POD: Postoperative day; FDG: Fluordeoxyglucose.