中文摘要：

为在既有硬件条件下提高工业计算机层析成像（computed tomography,CT）系统空间分辨率,分析了提高采样频率的半像素错位工业CT扫描方法,提出了一种基于代数迭代技术的直接重建算法,以面积权值对采集到的投影数据进行交替迭代,实现高分辨率图像重建.利用星型空间分辨率模型开展了计算机仿真分析,重建图像截止频率处的调制度达到0.8,表明了该方法提高空间分辨率的潜力.标准空间分辨率测试卡工业CT扫描重建实验结果进一步验证了其可行性和有效性.该方法简单、易行,在工业CT系统中有良好工程应用前景.

英文摘要：

In order to improve the spatial resolution of industrial computed tomography（CT） without changing the hardware,the half-pixel offset scanning mode was analyzed and a direct reconstruction algorithm,which was based on the algebraic iteration technique,was proposed.This algorithm adopted area-weight to execute directly the iterative update of the reconstructed value using the acquired projection data.Computer simulation analysis with a star-type spatial resolution phantom was implemented and a modulation of 0.8 was reached at the cut-off frequency.It demonstrates that the proposed method has the potential of improving the spatial resolution.The industrial CT experimental results of a standard spatial resolution phantom validate the feasibility and the effect of the method.The proposed approach is easy to implement and has a promising application future.