The aim of this study is to present the review of commissioning and Rapid Arc prerequisite QA results of Varian unique performance low energy linear accelerator (linac), was introduced by Varian Medical system (Palo Alto, CA, USA). The acceptance test and commissioning were performed for 6 MV photon beam and for the multileaf collimator (MLC). Percentage Depth Dose, Surface dose, Dose Profiles (In-plane, Cross-plane and Diagonal), Flatness, Symmetry, field size, Penumbra, Couch Sag, Couch transmission factor, MU Linearity, Beam Quality, Collimator Transmission, Photon leakage, MLC transmission factors were measured. Rapid Arc Commissioning and QA procedures specific to RapidArc delivery systems have been proposed using integrated images from an Electronic Portal Imaging Device (EPID). It has been observed that the outcome of a commissioning beam data generation fully complies with vendor specification and published literature.

Medical electron linear accelerator is important equipment, now used in radiotherapy departments clinically worldwide. Varian Unique Performance linear accelerator was introduced by Varian Medical system (Palo Alto, CA, USA) which deliver only single energy Photon beam (6 MV) with maximum dose rate ranges from 100 MU/min to 600 MU/min and it is equipped with Millennium 120 leaf MLC (Multi-Leaf Collimator) with 0.5 cm resolution at isocentre in the inner 20 cm and 1 cm resolution in the outer 20 cm. The couch top is Exact-IGRT couch top, Mechanical and Enhanced Dynamic Wedges were implemented in this machine. Image-guided patient repositioning is facilitated through 2D-2D MV image matching portal vision advanced imaging application and by automatic remote treatment couch movement managed by the image review application.

With Regards,
Sara Giselle
Associate Managing Editor
Journal of Medical Physics and Applied Scinces