A color coded ASL as well as an ADC map are demonstrated in a patient with a shrunken, fibrotic left kidney due to ischemia. In this case, the ASL color coded map illustrates reduced perfusion compared to the contralateral, un-affected kidney, whereas the ADC map shows restricted diffusion. Arterial spin labeling measurements of renal perfusion have not yet been widely accepted into routine clinical practice. The principle dilemma with ASL-techniques is the inherently low signal intensity. The technique is also prone to susceptibility artifacts. Courtesy of PD Dr. Blondin, University of Dusseldorf.