1 From the Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115-6195 (J.M., A.S.); Division of Nuclear Medicine, Department of Radiology, Brigham and Women's Hospital/Dana-Farber Cancer Institute, Harvard Medical School, Boston, Mass (E.D., C.S., H.J., H.S.); and Department of Radiology, Rhode Island Hospital, The Warren Alpert Medical School of Brown University, Providence, RI (J.H.).