On-Board Imager (OBI) 1.3, 1.4, 1.5; and Trilogy Mx, TrueBeam 1.0, Offline Review 1.0 - 2.0; || Product is manufactured and distributed by Varian Medical Systems Inc., Palo Alto, CA || The On-Board Imager device is used for verification of correct patient position in relation to isocenter and verification of the treatment fields relation to anatomical and/or fiducial landmarks. Trilogy Mx is intended to provide stereotactic radiosurgery and precision radiotherapy for lesions, tumors, and conditions anywhere in the body where radiation treatment is indicated.