Abstract：Objective To monitor and evaluate the dose and energy stability of Tomothepapy HT system and investigate the influence
of the replacing important components of system on the dose and energy stability. Methods A long-term detection for output and
energy stability of the Tomotherapy HT system was conducted according to the AAPM TG-148 report by using A1SL ionization
chamber and TomoElectronmeter and rectangular solid water phantom. The data were collected and the results were analyzed. The
data included the results of all the daily output and the monthly energy stability of the beam under the static model from March 2011
to March 2017. Results The average absolute deviation of the daily output was 1.2% in six years. The mean of absolute deviation
before and after the fixed target was 1.30%, 1.30% respectively (P=0.986). The mean deviations before and after the installation of
dose servo system (DCS) was 1.30%, 0.96% respectively (P<0.001). The mean absolute deviation of the energy stability monitoring
(Ratio_P20/P10) was 0.82% in six years. The average deviation before and after the fixed target was 0.82%, 1.11% respectively
(P=0.248). Before and after the installation of DCS, the absolute deviation was 1.11%, 0.64% respectively (P=0.088). Conclusion
The long-term dose and energy stability of TomoTherapy HT system is good. The effects of fixed target and rotating target on the
output dose and energy stability are not different. The installation of the DCS increases the stability of the output dose without
affecting the energy stability.
杨秀美，段继梅，岳麒，王志伟，谷丹. TomoTherapy HT系统长期剂量及能量稳定性监测[J]. 中国医疗设备, 2018, 33(7): 85-87.
YANG Xiumei, DUAN Jimei, YUE Qi, WANG Zhiwei, GU Dan. Long Term Dose and Energy Stability Monitoring of TomoTherapy HT System. China Medical Devices, 2018, 33(7): 85-87.
