1. Department of Radiotherapy, Peking Union Medical College Hospital, Beijing 100730, China丨
2. Varian Medical System (China) Co., Ltd, Beijing 100176, China
Abstract：Objective To study how to use Varian Halcyon linear accelerator for standardized treatment of postoperative patients with
cervical cancer. Methods A total of 28 cases of cervical cancer patients with postoperative radiotherapy were randomly selected.CT simulation, target area and organs at risk were delineated according to protocols. Three or four full arc volumetric intensity
modulated plans were designed. The results of dose distribution, intensity modulated verification, setup error and penetration dose
were analyzed. Results The treatment plan of 28 postoperative patients with cervical cancer met the clinical treatment standard. The
average values of target conformal index, dose gradient index and homogeneous index were 0.992, 3.911 and 1.064, respectively.
The average passing rate of double check of 3D γ was 99.386%. The average value of 3D γ passing rate of Portal Dosimetry
dose 2%/2 mm was 97.120%. The average passing rates of the Arccheck surface dose of 2%/2 mm and 3%/3 mm were 95.560% and
99.180%, respectively. Point dose mean deviation was -0.117%. The average value for consistency of composite field penetrating
fluence was 97.308%. Conclusion Halcyon v1.0 new “o-ring” accelerator can achieve better dose distribution and faster execution
efficiency in cervical cancer radiotherapy after surgery. Electronic portal imaging device based inter-fraction dose detection can
effectively detect the changes of body weight and internal organs during treatment.
杨波1，汪之群1，李文博1，王忆君1，张新2，吴柱凤2，周宗凯2，胡克1，张福泉2，邱杰1. 新型“环形”机架加速器在宫颈癌术后盆腔放疗的临床应用研究[J]. 中国医疗设备, 2021, 36(4): 24-29.
YANG Bo1，WANG Zhiqun1，LI Wenbo1，WANG Yijun1，ZHANG Xin2，WU Zhufeng2，ZHOU Zongkai2，HU Ke1，ZHANG Fuquan2，QIU Jie1. Clinical Application of “O-Ring” Linear Accelerator in Pelvic Radiotherapy
after Cervical Cancer Surgery. China Medical Devices, 2021, 36(4): 24-29.
