目的:比较医科达Synergy加速器和瓦里安Halcyon加速器2种放疗设备在宫颈癌调强放疗中的差异.方法:回顾性选择2021年6月至2022年12月在某院放疗中心放疗的60例宫颈癌术后患者,根据放疗设备的不同分为Halcyon组(30例)和Synergy组(30例),其中Halcyon组采用动态调强技术,Synergy组采用静态调强技术.比较2组在靶区和危及器官的剂量学参数、γ通过率、摆位误差及治疗效率等方面的差异.采用SPSS 24.0软件进行统计学分析.结果:2组计划剂量分布均能满足临床需求,与Synergy组相比,Halcyon组靶区均匀性指数、适形性指数以及梯度指数均较好(P<0.001),部分危及器官的照射剂量更低;Halcyon组的γ通过率高于Synergy组(P<0.01),且离散度低于Synergy组;2组患者在左右、头脚、上下方向的摆位误差差异无统计学意义(P>0.05);2组机器跳数差异无统计学意义(P>0.05),但在计划执行时间和总的治疗时间上Halcyon组远小于Synergy组(P<0.001).结论:在宫颈癌术后调强放疗中,相较于传统C型臂加速器Synergy,Halcyon加速器在剂量学指标和治疗效率方面更具有优势.
Objective To investigate the differences between Elekta Synergy and Varian Halcyon accelerators in intensity modulated radiotherapy for cervical cancer.Methods Totally 60 cases of postoperative cervical cancer patients treated with radiotherapy in the radiotherapy center of some hospital from June 2021 to December 2022 were selected retrospectively,who were divided into a Halcyon group(30 cases)and a Synergy group(30 cases)according to the equipment involved.The Halcyon group with dynamic IMRT technique and the Synergy group with static IMRT technique were compared in terms of dosimetric parameters in the target area and organs at risk,gamma passing rate,setup error and treatment efficiency.SPSS 24.0 software was used for statistical analysis.Results The two groups had the dosimetric distributions meet clinical requirements.The Halcyon group behaved better than the Synergy group in target area homogeneity index,conformity index and gradient index(P<0.001),which had lower irradiation dose in some endangered organs;the gamma passing rate was higher in the Halcyon group than that in the Synergy group(P<0.01),while the dispersion was lower in the Halcyon group;there were no significant differences between the setup errors of the two groups in the left-right,head-foot,and up-down directions(P>0.05);the two groups had no statistical differences in the number of monitor units(P>0.05),while the Halcyon group had the plan execution time and total treatment time much shorter than those of the Synergy group(P<0.001).Conclusion Halcyon accelerator gains advantages in dosimetric parameters and treatment efficiency over the traditional Synergy C-arm accelerator in intensity modulated radiotherapy for cervical cancer.[Chinese Medical Equipment Journal,2023,44(9):53-58]