1. Departments of Radiation Oncology (Y.C., J.M.B., F.T.), Radiology (Y.C., H.A.P.), and Biomedical Engineering (Y.C.), University of Michigan, Ann Arbor, Michigan; Department of Radiation Oncology, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada (C-L.T., A.S.); Department of Radiation Oncology, Shandong Cancer Hospital, Shandong University, Jinan, China (F.T.)