基于锥束CT系统标定几何中心的参数误差分析

Parameter error analysis based on the calibration geometric center of cone-beam CT system

CT系统在安装过程中,受环境和装置本身的影响往往存在误差。本文针对CT系统所标定的几何中心参数进行精度分析和稳定性分析,利用计算出的系统几何参数误差对投影数据做出相应的调整,将投影数据恢复成理想情况下的投影数据,得出新数据后,应用FDK重建算法设计新模板、建立对应的标定模型。

In the course of installation of the system, there are always errors due to the influence of the environment and the device itself. In this paper, the accuracy and stability of the geometric center parameters calibrated by the CT system are analyzed. The projection data is adjusted by the calculated system geometric parameter error, and the projection data is restored to the projection data under ideal conditions. After the new data is obtained, the new template is designed by using the FDK reconstruction algorithm and the corresponding calibration model is established.