1. From the Departments of Diagnostic Radiology (M.F.B., B.W.C., S.L.B.C., G.S.S., E.G.O.) and Radiation Oncology (D.G.), University of Texas, MD Anderson Cancer Center, 1515 Holcombe Blvd, Unit 1478, Houston, TX 77030; Department of Diagnostic Radiology, Baylor College of Medicine, Houston, Tex (A.P.A.B.); and Department of Diagnostic Imaging, Chaim Sheba Medical Center, Ramat Gan, Israel, affiliated with Tel Aviv University, Tel Aviv, Israel (E.M.M.).