中国医学装备2025，Vol.22Issue(4)：18-22,5.DOI:10.3969/j.issn.1672-8270.2025.04.004
不同图像引导系统在宫颈癌放射治疗摆位误差和靶区外放中的对比研究
Comparative study of different image-guided systems in positioning error and placement outside the target area of radiotherapy for cervical cancer
刘莉 1何淼 1叶程伟 1袁建军 1罗银贵 1罗志尧 1曾伟 1李羚 1刘欢 1刘艳1
作者信息
- 1. 德阳市人民医院肿瘤科 德阳 618000
- 折叠
摘要
Abstract
Objective:To compare and analyze the differences in positioning errors and placement outside the target area between two different image-guided systems(Halcyon and Synergy)in radiotherapy for cervical cancer.Methods:The data of 40 patients with cervical cancer who received treatment in Dezhou People's Hospital from March 2023 to June 2023 were retrospectively selected.Each patient was treated respectively with Halcyon linear accelerator and Synergy linear accelerator,with 20 cases for each treatment method.All patients underwent cone beam computed tomography(CBCT)at kV level to conduct image scanning before radiotherapy,and the obtained CBCT images were matched with the positioned CT images by online.The registration results of left and right(x),head and foot(y)and front and back(z)of three translation direction,and pitch(Rx),rotation(Ry)and deflection(Rz)directions of rotation direction were respectively obtained.The margin of planning target volume(MPTV)was calculated according to positioning expansion formula.The differences of positioning errors and target area expansion between Halcyon and Synergy image-guided systems were compared and analyzed.Results:Halcyon and Synergy image-guided systems obtained respectively 479 and 447 sets of CBCT images.The translational errors of Halcyon image-guided system on x,y,and z directions were respectively(-0.03±0.21),(0.12±0.63)and(0.02±0.15)cm,and the rotational errors of that on Rx,Ry and Rz directions were respectively(0.38±1.26)°,(-0.40±1.02)°,and(0.07±1.07)°.The translational errors of Synergy image-guided system were respectively(-0.07±0.18),(0.08±0.49)and(0.11±0.22)cm on the three directions,and the rotational errors of that were respectively(0.28±1.29)°,(-0.29±1.29)° and(-0.16±1.20)°.The translational error values on the y direction of both image-guided system were larger than that on x and z directions,and the absolute values of the range of translational errors of them were basically within 5 mm.There were no statistically significant difference in the positioning errors of rotation on Rx and Ry directions between Halcyon and Synergy image-guided systems(P＞0.05),while there was a statistically significant difference in the positioning error of rotation on Rz direction between them(t=-3.06,P＜0.05).The MPTV values of Halcyon image-guided system on x,y and z directions were respectively 0.4,1.4 and 0.3 cm,and those of Synergy image-guided system were respectively 0.4,0.9 and 0.5 cm.The expansion boundary of target area of Halcyon image-guided system on the y direction was larger than that of Synergy image-guided system,and that on other directions were all less or equal to 0.5 cm.Conclusion:The MPTV values of Halcyon and Synergy image-guided systems can meet clinical requirements in radiotherapy.The positioning errors and the tube current of the scan of Halcyon image-guided system were larger than those of Synergy image-guided system,but the scanning time and treatment time of that were significantly lower than those of Synergy image-guided system.Different treatment systems can be selected individually for patients according to their different conditions.关键词
宫颈癌/图像引导/Halcyon医用直线加速器/Synergy医用直线加速器/摆位误差Key words
Cervical cancer/Image guidance/Halcyon/Synergy/Positioning error分类
医药卫生引用本文复制引用
刘莉,何淼,叶程伟,袁建军,罗银贵,罗志尧,曾伟,李羚,刘欢,刘艳..不同图像引导系统在宫颈癌放射治疗摆位误差和靶区外放中的对比研究[J].中国医学装备,2025,22(4):18-22,5.
