工业CT中ART算法权因子的研究

Study of the ART Algorithm Weight Factor in the Industrial CT

图像重建是工业CT(Computed Tomography)的重要组成部分,ART(Algebraic Reconstruction Techniques)算法是工业CT图像重建中的一种重要代数方法,权因子的计算是ART算法中前期的主要工作.以工业CT中ART算法的权因子为研究对象,介绍了一种切实可行的权因子算法.通过siddon改进算法与快速算法的图像重建比较,得出2种算法权因子计算时间相当,siddon改进算法重建时间为快速算法的1/2,并且它们重建的图像质量也相当.因此,在重建时间上,siddon改进算法是快速算法效率的2倍.

The image reconstruction is an important part of the industrial CT and the ART is an important algebraic method in the image reconstruction.It is the main work to solve of weight factor at early stage in ART Algorithm.In this paper,the weight factor was studied so as to find an optimal algorithm.Through the comparison between image reconstructions by the siddon-improved algorithm and the fast algorithm,we have got the conclusion that both the computing times for weight factor are quite the same,but the reconstruction time of siddon-improved algorithm is half of the fast algorithm,while their images are quite the same in quality.Hence,as for the efficiency of reconstruction time,the siddon-improved algorithm is twice as fast as algorithm times of fast algorithm.