Ping Xia, PhD, is Head of Medical Physics and Professor of Molecular Medicine, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH.Andrew Godley, PhD, Staff Physicist, Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland OHGregory M. M. Videtic, MD, CM, FRCPC, Professor of Medicine, Cleveland Clinic Lerner College of Medicine; Staff Physician, Department of Radiation Oncology, Cleveland Clinic Foundation, Cleveland, OhioJohn Suh, MD, Professor and Chairman, Department of Radiation Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, Ohio