1Research Center Magnetic-Resonance-Bavaria (MRB), Wuerzburg, Germany, 2Center of Neural Engineering, Departments of Engineering Science and Mechanics, Neurosurgery, and Physics, Penn State University, University Park, PA, United States, 3High Field MRI Facility, Huck Institutes of the Life Sciences, Penn State University, University Park, PA, United States, 4Department for Experimental Physics 5 (Biophysics), University of Wuerzburg, Wuerzburg, Germany