Authors : Kaustav Kashyap Baruah; Trishul Subham Keshri

Volume/Issue : Volume 8 - 2023, Issue 11 - November

Google Scholar : http://tinyurl.com/mr33zf7h

Scribd : http://tinyurl.com/3ppuh39w

DOI : https://doi.org/10.5281/zenodo.10377080

Abstract : The main aim of this study to present the dosimetric aspects of Commissioning performed on an Elekta Compact with high dose rate for clinical treatment. Acceptance and Commissioning Tests were performed for 6MV photon energy on the Elekta Compact machine. Dosimetric tests were performed and Mechanical datas were measured and evaluated. The measurements includes output calibration, beam quality measurement, percent depth dose (PDD), in plane beam profile, cross plane beam profile couch transmission factor, tray transmission factor, wedge transmission factor. The mechanical isocenter check w.r.t gantry, collimator and couch were also measured and all found within limit. The PDD of 6MV for 10 × 10cm2 field size increases at first up to a certain depth and then gradually falloff with depth. The in- plane flatness symmetry values and cross-plane flatness symmetry values for 6MV were measured and found not much difference between them. The in-plane penumbra values are higher than the cross-plane penumbra values for each field sizes (5x5 cm2, 10x10 cm2, 30x30 cm2). The output calibration and beam quality index were measured with 0.6cc Farmer Chamber in a water phantom and found within acceptable limit. Couch transmission factor, tray transmission factor, wedge transmission factor were all measured with suitable dosimeter. The radiation treatment to patient depends on the commissioning data modeled in the treatment planning system. These sets of commissioning data will be helpful to others to perform Elekta Compact commissioning which will definitely improve patient safety.

Keywords : Quality Assurance, Absorbed dose, Beam quality, Flatness, Symmetry, Penumbra.