1. From the Department of Radiology, University Hospital Cologne, Cologne, Germany; Department of Clinical Radiology, University Hospital Muenster, Muenster, Germany; Department of Radiology, Columbia University Medical Center, New York, NY; Department of General Surgery, Surgical Research, University Hospital Muenster, Muenster, Germany; Philips Research Europe, Hamburg, Germany; and Department of Radiology, St. Franziskus Hospital, Muenster, Germany