【摘要】 文章研究CT系统参数标定及成像问题。首先通过对已知结构样品的吸收率和接收信息的分析,建立合适的数学模型。然后利用最小二乘拟合,计算CT系统的旋转中心位置。在CT系统参数已经定出的情况下,分析某未知介质的接收信息数据,采用基于Radon变换的滤波反投影法来重构图像。同时,采用内插运算进行数据矫正后,利用MATLAB导出几何信息及吸收率。最后,提出一种基于原始投影数据的CT中心校正方法,用以消除旋转中心不准确而造成的误差。更多还原

【Abstract】 This paper studies the problem of the parameter calibration and imaging of CT system. First of all, a suitable mathematical model is established by analyzing the absorbility and receiving information of the samples with known structure. Then the rotation center position of CT system is calculated by least square fitting. When the parameters of CT system have been determined, the image is reconstructed by analyzing the received information data of an unknown medium and filtering back projection method based on Radon transform. At the same time, the geometric information and absorbility are derived by MATLAB after the interpolation operation is used to correct the data. Finally, a correction method of CT center is proposed based on original projection data, which can effectively eliminate the errors caused by the inaccuracy of the center of rotation.更多还原