Abstract

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Title:: Using PTW QUICKCHECK webline to monitor the output stability of linear accelerator

Author(s):: JIANG Dazhen; WANG Xiaoyong; ZHANG Jun; XIE Conghua; WANG Dajiang; CHEN Cheng; CHEN Fei; JIANG Zhou; XIAO Zhizhi; ZHANG Qingling; LIU Haiyang; WANG Zhonghao; WANG Kan; ZHOU Mingjian; LIU Hui; Department of Radiation and Medical Oncology, Hubei Key Laboratory of Tumor Biological Behaviors, Hubei Cancer Clinical Study Center, Zhongnan Hospital of Wuhan University, Wuhan 430071, China

Keywords:: Keywords: PTW QUICKCHECK webline; linear accelerator; stability; quality assurance

Abstract:: Abstract: Objective To analyze the output stability of a medical linear accelerator by PTW QUICKCHECK webline. Methods The absolute doses of the medical linear accelerator before and after the replacement of ionization chamber were collected in this study. The monitoring results of accelerator by PTW QUICKCHECK webline were retrospectively analyzed, and the output stabilities of different energies from the same accelerator were analyzed. Results The central-axis dose for 6, 10 MV X-ray and 6, 9, 12 MeV electron beams were within ±3%. Analysis of variance showed that there was no significant difference in the output stability of different energies from the same accelerator (P>0.05). The monitoring of PTW QUICKCHECK webline revealed that the output dose kept increasing, and the malfunction of ionization chamber was confirmed by the subsequent detection. After the replacement of ionization chamber, the output dose was close to the standard value and only fluctuated in a small range, having a high stability performance. Using PTW QUICKCHECK webline could detect the hidden danger of the accelerator in advance and help the physicist detect and eliminate the hidden danger in time. Conclusion The output dose measurement before daily treatment by PTW QUICKCHECK webline can ensure the accuracy and stability of the linear accelerator, effectively reduce the system error and avoid serious mistakes.