1. From the Department of Diagnostic and Interventional Radiology, Lausanne University Hospital (CHUV), Centre Hospitalier Universitaire Vaudois, Rue du Bugnon 46, 1011 Lausanne, Switzerland (S.J., D.R., C.P.); and Center for Virtual Imaging Trials, Carl E. Ravin Advanced Imaging Laboratories, Clinical Imaging Physics Group, Department of Radiology, Duke University Health System, Durham, NC (F.R.).