TiGRT IVS与XVI图像引导系统在宫颈癌放疗摆位误差分析中的对比研究  

Comparison of Setup Error Evaluation in Cervical Cancer Radiotherapy Between TiGRT IVS and XVI Image-Guided System

作　　者：罗灿 彭丽洁 杨定强 段小娟 李东春 戴红娅 周一兵 LUO Can;PENG Lijie;YANG Dingqiang;DUAN Xiaojuan;LI Dongchun;DAI Hongya;ZHOU Yibing(Department of Radiation Oncology,Xinqiao Hospital Army Medical University,Chongqing 400037,China)

机构地区：[1]陆军军医大学第二附属医院肿瘤科放疗中心,重庆400037

出　　处：《中国医疗设备》2022年第12期69-72,共4页China Medical Devices

基　　金：2020年重庆市科卫联合医学科研项目(2021MSXM064);2020年重庆市科卫联合医学科研项目(2021MSXM154)。

摘　　要：目的比较TiGRT IVS与XVI图像引导系统在宫颈癌放疗摆位误差分析中的应用效果。方法选取我院2020年8月至2021年10月的收治的30例宫颈癌患者,放疗前使用TiGRT IVS系统获取正位和侧位电子射野影像系统图像,并与定位CT所生成的参考图像对比得到前后(Anterior-Posterior,AP)、头脚(Superior-Inferior,SI)、左右(Left-Right,LR)3个方向的摆位误差。同时使用Synergy加速器搭载的XVI系统进行锥形束CT扫描,获取3个方向的摆位误差。采用Bland-Altman图比较2种系统摆位误差的一致性,并使用Wilcoxon符号秩检验比较操作所需要的时间。结果试验共获取150组图像,两种图像引导系统的摆位误差在AP、SI、LR方向上的一致性区间分别为(-0.29,0.22)cm、(-0.26,0.29)cm、(-0.24,0.27)cm。TiGRT IVS组时间明显短于XVI组(P<0.001)。结论TiGRT IVS图像引导系统在与XVI图像引导系统在宫颈癌放疗的摆位误差比较中具有较好的一致性,并存在时间和成本优势,而XVI则在软组织显影、体积成像,以及额外辐射剂量方面表现更为突出。Objective To compare the application effect of TiGRT IVS and XVI image guidance system in the positioning error analysis of cervical cancer radiotherapy.Methods A total of 30 patients with cervical cancer treated in our hospital from August 2020 to October 2021 were selected.Before radiotherapy,TiGRT IVS system was used to obtain anterior-position and lateral electron field image system images,and compared with the reference image generated by the positioning CT,the positioning errors in the three directions[anterior-posterior(AP),superior-inferior(SI)and left-right(LR)]were obtained.At the same time,the XVI system on Synergy accelerator was used to perform cone beam CT scanning to obtain alignment errors in three directions.Bland-Altman diagram was used to compare the consistency of the positioning errors of the two systems,and the Wilcoxon test was used to compare the time required for operation.Results A total of 150 groups of positioning verification images were obtained in the experiment.The consistency intervals of the positioning errors of the two image guidance systems in the AP,SI and LR directions were(-0.29,0.22)cm,(-0.26,0.29)cm,and(-0.24,0.27)cm,respectively.For the time consumption,TiGRT IVS group was significantly shorter than that in XVI group(P<0.001).Conclusion TiGRT IVS image guided system has better consistency in the positioning error comparison of cervical cancer radiotherapy with XVI image guided system,and has advantages in time and cost,while XVI is more prominent in soft tissue development,volume imaging,and additional radiation dose.

关 键 词：宫颈癌 图像引导 TiGRT IVS XVI 摆位误差 

分 类 号：R144[医药卫生—公共卫生与预防医学] R730