基于RADON逆变换对CT系统参数标定及成像分析

Parameter Calibration and Imaging Analysis of CT System Based on RADON Inverse Transform

针对CT系统参数标定及成像,运用了Radon逆变换、微分方程及改良的遗传算法等理论,构建了正弦图求解距离及角度、基于遗传算法的旋转中心位置及基于衰减原理的定点吸收率、精读及稳定性分析等模型,综合运用了MATLAB、EXCEL及C++等软件编程求解,得出了CT系统旋转中心位置、探测器单元之间的距离及入射角度、未知介质几何形状和吸收率等物理信息等结论.最后设计新模板,给出改进CT系统标定精度和稳定性的相关可行方案.

In this paper,based on the theory of RADON inverse transform,differential equation and improved genetic algorithm,the models of a sinogram to solve the problem of calibration and imaging of CT system,the center of rotation and the fixed point based on the principle of attenuation based on genetic algorithm Absorbance,read and stability analysis model are constructed. The software of MATLAB,EXCEL and C ＋＋ are used to solve the problem. The results of the position of the center of rotation of the CT system,the distance between the detector units and the incident angle,the geometry of the unknown medium and the absorption Rate and physical information,etc are gained. Finally,a new template is designed,and some feasible solutions to improve the calibration accuracy and stability of CT system are given.