1Neuroimaging, Burdenko Neurosurgery Institute, Moscow, Russian Federation, 2Institute of Neuroscience and Medicine – 4, Medical Imaging Physics, Forschungszentrum Juelich GmbH, Juelich, Germany, 3Experimental physics III, TU Dortmund University, Dortmund, Germany, 4Institute of Neuroscience and Medicine – 4, Medical Imaging Physics, Forschungszentrum Juelich GmbH, Julich, Germany, 5Faculty of Medicine, Department of Neurology, RWTH Aachen University, JARA, Aachen, Germany, 6Radiology, Krasnodar Regional Hospital, Krasnodar, Russian Federation