MPC-DLT法校正锥形束CT几何参数  

MPC-DLT based Geometry Calibration Method of Cone Beam CT

作　　者：陈宇思 钟安妮 吕晓龙 CHEN Yusi;ZHONG Anni;LV Xiaoong(Guangzhou Huaduan Technology Co Ltd,Guangzhou 510700,China)

机构地区：[1]广州华端科技有限公司,广州510700

出　　处：《核电子学与探测技术》2023年第4期719-724,共6页Nuclear Electronics & Detection Technology

基　　金：广东省重点领域研发(2020B1111130004)资助。

摘　　要：为解决几何标记物放置准确性的问题,探讨了一种利用MPC-DLT算法校正锥形束CT几何参数的方法。该方法通过迭代方式更新几何标记物的空间坐标并进行直接线性变换构造代价函数,最小化代价函数即为标记物坐标最优解。实验结果表明,相比传统方法,MPC-DLT可显著降低扫描过程中几何参数的震荡幅度,提高几何校正的精度,降低重建图像的几何畸变,同时保持图像空间分辨率不变。To solved the marker position mis-alignment of geo-phantom,a MPC-DLT based geometry calibration method of cone beam CT is discussed.The method updates marker coordinates iteratively and constructs cost function using direct linear transform approach,geting the optimized solution by minimizing cost value.Experiment results show that the oscillation amplitude of geometry parameters during the scan period is significantly decreased and calibration accuracy is improved by proposed method compared to traditional one.More over,the geometry distortion of reconstructed image is obviously reduced,while the spatial resolution remains the same.

关 键 词：锥形束CT 几何校正 几何标记物偏差 MPC DLT 

分 类 号：TN911.73[电子电信—通信与信息系统]