1. From the Department of Diagnostic and Interventional Radiology and Neuroradiology (S.S., T.S., A.W., M.F., K.N.) and Department of High Field and Hybrid MR Imaging (H.H.Q.), University Hospital Essen, Hufelandstrasse 55, 45122 Essen, Germany; and Institute of Medical Radiation Biology (E.M., G.I.) and Erwin L. Hahn Institute for MR Imaging (O.K., H.H.Q.), University of Duisburg-Essen, Germany.