Todd Pawlicki, PhD, FAAPMProfessor and Vice-Chair of Medical PhysicsDepartment of Radiation Medicine and Applied SciencesUniversity of California, San Diego, CA, USADaniel J. Scanderbeg PhDAssociate ProfessorDepartment of Radiation Medicine and Applied SciencesUniversity of California, San Diego, CA, USAGeorge Starkschall PhD, FACMP, FAAPM, FACRResearch Professor,Department of Radiation Physics,Division of Radiation Oncology,The University of Texas MD Anderson Cancer Center,Houston, TX, USA