1Center for Magnetic Resonance Research, University of Illinois, Chicago, IL, United States, 2Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL, United States, 3Department of Biomedical Engineering, Texas A&M University, College Station, TX, United States, 4Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany