Abstract

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Title:: Comparison of beam characteristics after beam matching in two Elekta linacs

Author(s):: FANG Chunfeng1; XU Wei1; 2; SONG Yuanyuan1; XIE Kun1; JIANG Zhongkai1; WANG Zishen1; ZHAO Zhiyu1; XU Shouping1; 2; 1. Department of Radiation Oncology, Hebei Yizhou Cancer Hospital, Zhuozhou 072750, China; 2. Department of Radiation Oncology, the First Medical Center of Chinese PLA General Hospital, Beijing 100853, China

Abstract:: Abstract: Objective To compare and analyze the beam characteristics after beam matching in two Elekta linacs and provide the basis and reference for realizing the interchangeable implementation of treatment plans on two linacs. Methods The data related to X-ray and electron beams generated by two accelerators were obtained using IBA Blue Phantom2 and the obtained data were compared and analyzed. Results The %dd(10)X deviations for 6 and 10 MV between two accelerators was within ±0.1% and ±0.3%, respectively. The differences in flatness and symmetry between the two energy levels under the corresponding fields were within ±1.5%, and the maximum absolute deviation of the penumbras was 0.5 mm. The maximum difference in %dd(10)X between the two energy levels in 60° wedge fields was 0.8%. The differences of the electron beams generated by two accelerators in the Rp, R50 and E0 were within ±1.2%, and the maximum dmax deviation was 0.9 mm. Although there were certain deviations in the output factors of each field for different energy levels, the deviations were trivial. Conclusion The beam characteristics of two linacs show a good matching of beam data, which will provide a solid foundation and necessary reference for the interchangeable implementation of clinical plans on two linacs.