CTVision和MV-CBCT两种IGRT技术在放疗摆位中的应用

摘要

目的：对大孔径CT和MV-CBCT图像引导的放射治疗流程的介绍以及利用两种方法获得的摆位误差进行分析，比较两种图像引导方式在放疗摆位应用中的不同之处。方法：15例患者（鼻咽癌5例，前列腺癌4例，宫颈癌6例）治疗前分别进行CT和MV-CBCT图像采集，并与计划CT进行图像融合，MV-CBCT采用自动配准方式，CT采用自动＋手动配准方式，分析两组数据，探讨CTVision和MV-CBCT两种IGRT的应用。结果：CTVision和MV-CBCT对15例病人图像引导的方式在X、Y、Z方向的摆位误差均没有统计学意义，但Y方向的误差有一定差异。结论：CTVision图像更为清晰，采集时需要剂量更少，但所需时间较长，技术员需进出机房两次。%Objective:Introducing the image -guided radiation therapy process of large aperture CT and MV -CBCT and analyzing obtained deviations,to discuss the differences between the two methods of positioning applica-tion.Methods:Fifteen patients(5 nasopharyngeal carcinoma,4 prostate cancer and 6 cervical cancer)were performed CT and MV-CBCT before radiation therapy.All images were compared with the planning CT by image fusion.The MV-CBCT used automatic registration method and the CT used automatic and/or manual method.To analyze two sets of data to discuss the positioning application of CTVision and MV-CBCT.Results:Both image-guided methods for the patients'positioning error had no statistical significance in X,Y,Z directions,but there were some differences in Y direction.Conclusion:Compared to MV-CBCT,the images of CT are clearer and dose requires fewer,but need more time and technicians must enter LINAC room twice.