Evaluation of dose delivery stability of a new linear accelerator TrueBeam

VernacularTitle:医用加速器TrueBeam剂量输出长期稳定性研究
Author: Lili WU ; Hao LIN ; Hong CHEN
Publication Type:Journal Article
Keywords: Daily quality assurance tool; Stability; Dose
From: China Medical Equipment 2014;(6):34-36,37
CountryChina
Language:Chinese
Abstract: Objective:To study the long-term stability of 6MV photon beam on TrueBeam, which is a new linear accelerator introduced by Varian Medical System. Methods:QA BeamChecker Plus (QABC+, Standard Imaging Inc., Middleton, USA) was used to measure 6MV X-ray on TrueBeam linac as daily quality assurance (Daily QA). Dosimetric parameter, including output Constancy, flatness and symmetry, were employed to evaluate the dose delivery stability of TrueBeam linac. Results: Daily QA results of 18 months showed the dose output delta was (0.0%±0.7%), only once out of tolerance of 2%. The constancy of Flatness was excellent with the delta of (0.1%±0.1%). The symmetric of axial and transverse varied within 1%. Conclusion:The output constancy of TrueBeam with 6MV is very stable, as well as flatness and symmetry. It’s stable and reliable to implement Truebeam linear accelerator in clinical.