Verification Phantom-based clinical quality control and detection of the MLC of CyberKnife M6
10.3760/cma.j.cn112271-20220325-00121
- VernacularTitle:基于验证模体的第六代射波刀系统多叶光栅模式临床质量控制检测研究
- Author:
Xuyao YU
1
;
Yang DONG
;
Yuwen WANG
;
Zhiyong YUAN
;
Xiaolin TIAN
;
Zeqian NIU
;
Huaming CHEN
;
Jingsheng WANG
;
Yongchun SONG
Author Information
1. 天津医科大学肿瘤医院放疗科 国家恶性肿瘤临床医学研究中心 天津市恶性肿瘤临床医学研究中心 天津市肿瘤防治重点实验室，天津 300060
- Keywords:
CyberKnife;
Multileaf collimator;
Verification phantom;
Output dose;
Daily check
- From:
Chinese Journal of Radiological Medicine and Protection
2022;42(7):511-515
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To provide a new morning check method for the output dose stability of the multileaf collimator (MLC) of the CyberKnife M6 (CK-M6) system.Methods:The CT images of a verification phantom with a size of 20 cm × 20 cm × 10 cm were transmitted into the Precision Treatment Plan ning System (ver. 1.1.1.1). The high-precision alignment between the accelerator output front and the fixed position of the phantom surface was achieved using the fiducial tracking method. A 10 cm × 10 cm radiation field was formed by the MLC and a DailyCheck plan with an output of 200 MU was designed. The repeatability, sensitivity, and accuracy of the DailyCheck plan were measured, and the CK-M6 system was continuously tested for one month using the artificial fixed method and the DailyCheck plan designed in this study. Results:The average and the standard deviation of 10 repeated measurements by the DailyCheck plan were 492.28 pC and 0.09, respectively, indicating good stability. There was a linear correlation between the measured values and the output dose, with a correlation coefficient of R2 > 0.999. Moreover, there was a position deviation of 2 mm between the phantom and the accelerator output front, and the result ant effect on the measured values was equivalent to a dose deviation caused by an output of 1.24 MU. The result from the continuous measurement of both the artificial fixed method and the DailyCheck plan fell within permissible limits, showing high consistency. Conclusions:The DailyCheck plan established through the fiducial tracking of a verification phantom can achieve the convenient, quick, and accurate daily detection of the output dose stability of the MLC of CK-M6. Therefore, this method can be widely applied in the clinical quality control of the CK-M6 system.
