感兴趣体积IVS技术在腹部肿瘤配准范围的研究

Influence of IVS Different Registration Ranges in Abdomen Image Guidance

目的采用苏州雷泰公司的电子射野影像系统(Image Verification System,IVS),探讨三种不同的感兴趣体积(Volume of Interest,VOI)配准范围在腹部肿瘤摆位验证中配准精度的影响。方法分别获取盆腔仿真模体的定位图像和20组已知位置偏差的IVS图像进行配准,选取三种不同的VOI范围,得到三维平移方向的摆位误差,进行对比分析。结果选取配准范围VOI为35 cm×35cm×35 cm摆位误差最小。VOI为35 cm×35 cm×35 cm与VOI为25 cm×25 cm×25 cm和10 cm×10 cm×10 cm相比,x、y、z三个方向的摆位误差均具有明显的统计学差异(P<0.05)。结论对于盆腔部肿瘤而言,图像配准范围VOI建议选取35 cm×35 cm×35 cm配准结果的误差最小。

Objective The effects of three different volume of interest(VOI)registration ranges on the accuracy of abdominal tumor placement verification were investigated by using image verification system(IVS)developed by Suzhou Reitel.Methods The positioning images of anthropomorphic pelvic phantom and 20 groups of IVS images with known position deviations were obtained for registration.Three different VOI ranges were selected to obtain the positioning errors of three-dimensional translation direction for comparative analyzed.Results The VOI of 35 cm×35 cm×35 cm was selected as the minimum positioning error.Compared with VOI of 25 cm×25 cm×25 cm×25 cm and 10 cm×10 cm×10 cm,the positioning errors in x,y and z directions had significant statistical differences(P<0.05).Conclusion For pelvic tumors,VOI of image registration range 35 cm×35 cm×35 cm is recommended to minimize the error of registration results.