工业CT技术是目前最常用的一种先进无损检测手段。其中最常用的图像重建算法是代数重建法(ART),它重建图像的质量和时间受到许多因素的影响。在重建图像时加入松弛因子可以加快算法的收敛速度,并且还能有效克服迭代过程中的椒盐噪声。利用计算机仿真实验对比分析了松弛因子在不同投影数下的重建质量,结果表明,在不同的情况下选择适当的松弛因子,可以大大地改善重建图像的质量。

Industrial computed tomography (ICT) is an advanced means for nondestructive testing. The quality and time of the image reconstruction with algebraic reconstruction techniques (ART) algorithm is influenced by many factors. By adding a relaxation factor, the convergence speed can be accelerated and the problem of salt and pepper noise can be overcome. Computer simulation experiments were conducted on relaxation factor under different projection numbers, and the construction quality was compared and analyzed. The results show that the reconstruction quality can be improved greatly if suitable relaxation factor is selected.