1Department of Preclinical Imaging and Radiopharmacy, Werner Siemens Imaging Center, Eberhard Karls University of Tuebingen, Tuebingen, Germany, 2Neurology & Epileptology and Werner Reichardt Centre for Integrative Neuroscience, Eberhard Karls University of Tuebingen, Tuebingen, Germany, 3Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, NJ, United States, 4Interventional and Diagnostic Radiology, Eberhard Karls University of Tuebingen, Tuebingen, Germany, 5Nuclear Medicine and Werner Reichardt Centre for Integrative Neuroscience, Eberhard Karls University of Tuebingen, Tuebingen, Germany