Ioannis Sechopoulos1, Annalisa Trianni2, Donald Peck3. 1. Departments of Radiology and Imaging Sciences, Hematology, and Medical Oncology and the Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia. Electronic address: isechop@emory.edu. 2. Department of Medical Physics, S. Maria Della Misericordia University Hospital, Udine, Italy. 3. Department of Diagnostic Radiology, Henry Ford Health System, Detroit, Michigan.