RL滤波函数的改进对卷积反投影图像重建的影响

The Influence of Modified-RL Filter Function on the Quality of Image Reconstruction Using Convolution Backprojection Algorithm

在工业无损检测中,利用X射线CT成像的算法———卷积反投影算法对图像进行重建时,滤波函数对图像重建质量影响很大.作者利用多点平均法对RL滤波函数作了改进,发现3点平均法的滤波函数对图像的重建质量有明显的改善.

The filter function in convolution backprojection algorithm of X-ray CT is very important to the quality of image reconstruction. The RL filter function is modified by multi-point average method. By computer simulation the images reconstruction are made for a model which is consisted of a Fe ball with different sizes of Pb ball, C ball and air hole within it. It is found that the three-point average method is the best one in restraining noise and eliminating false trace.