American Society for Therapeutic Radiology and Oncology (ASTRO) and American College of Radiology (ACR) practice guidelines for image-guided radiation therapy (IGRT).

*Department of Radiation Medicine, Long Island Jewish Medical Center, New Hyde Park, New York; yDepartment of Radiation Oncology, University of Colorado, Denver, Colorado; zDepartment of Radiation Oncology, Thomas Jefferson University, Philadelphia, Pennsylvania; xSection of Radiation Oncology, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire; {CyberKnife Center of Miami, Miami, Florida **Department of Radiation Oncology, MD Anderson Cancer CenterOrlando, Orlando, Florida; yyDepartment of Radiation Oncology, Northwest Community Hospital, Arlington Heights, Illinois; zzDepartment of Radiation Oncology, Mt. Sinai Medical Center, Miami, Florida; xxDepartment of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas; {{Department of Radiation Oncology, Scripps Clinic, La Jolla, California; ***Department of Radiation Oncology, Wayne State University, Detroit, Michigan; yyyDepartment of Radiation Oncology, Stanford University, Stanford, California; and zzzRadiation Oncology Center, Radiological Associates of Sacramento, Sacramento, California