1. From the Department of Neurology (F.S., L.S., T.W., A. Harloff) and Department of Neuroradiology (S.M.), University Medical Centre, Freiburg, Germany; Fraunhofer MEVIS, Bremen, Germany (A. Hennemuth); and Department of Radiology, Feinberg School of Medicine (M.M.) and Department of Biomedical Engineering, McCormick School of Engineering (M.M.), Northwestern University, Chicago, IL.