Varis, Aria Radiation Oncology - Version 8.1.15, 8.5.11, and 8.6.07, Model number HIT-INFSYS, Manufactured by Varian Medical Systems Inc., Palo Alto, CA || The Varis RV function is designed to assist the operator of a radiation therapy device in providing accurate treatment setups for each patient by monitoring set up parameters and preventing the radiation therapy device from commencing irradiation while any parameter is out of conformance with the treatment plan. Additional applications provide various data management and library functions.