CT系统参数标定及成像数学模型

Mathematic Model of Parameter Calibration and Image Reconstruction of CT Machine

CT系统可以在不破坏样品的情况下,从各个角度用探测器接收旋转的X光管发出、并由穿过样品的衰减的射线,经过计算重建图像。针对第一代旋转平移式CT机参数标定和图像重建的问题,运用了最小二乘拟合、滤波反投影、几何及迭代等理论或方法,得到了接收信息与穿过介质的X光长度之间的关系,综合运用了Matlab及Excel等软件编程求解,得出了一套平面CT系统参数标定的算法,并给出合理建议。

The CT system can uses the detector to receive from various directions the ray sent from X light pipe and passing through the sample without sample destruction so as to reconstruct the image with computing. Aiming at arameter calibration and image reconstruction of the first generation of rotating horizontally CT machine, the relationship between the length of the X-ray through the medium and the receiving information are obtained by using the least squares fitting, filter back projection, geometry and iterative theories or methods. By the aid of Matlab and Excel software, a set of algorithm for planar CT system parameter calibration are obtained. At last, the reasonable suggestions are provided.