1Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich, German Center for Diabetes Research (DZD), Tübingen, Germany, 2Section on Experimental Radiology, Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Tübingen, Germany, 3Department of Endocrinology and Diabetology, Angiology, Nephrology and Clinical Chemistry, Institute for Diabetes Research and Metabolic Diseases (IDM) of the Helmholtz Center Munich, German Center for Diabetes Research (DZD), Tübingen, Germany, 4Department of Diagnostic and Interventional Radiology, University Hospital Tübingen, Tübingen, Germany, 5Siemens Healthcare, Erlangen, Germany