抽样间距和投影数对卷积滤波法图像重建质量的影响  

The Influence of Sampling Space and Projection Data on Image Reconstruction from Convolution Backprojection Algorithm

作　　者：刘晓[1] 杨朝文[1] 

机构地区：[1]四川大学物理系,成都610064

出　　处：《四川大学学报（自然科学版）》2004年第3期588-593,共6页Journal of Sichuan University(Natural Science Edition)

摘　　要：利用卷积反投影算法对图像进行重建时,要降低成本,提高成像效率,就必须选取合理的抽样间距和投影数.作者在分析抽样间距和投影数对图像重建质量影响时发现,在噪音比较大的情况下,抽样间距过小,会使重建图像的质量下降,而投影数的变化对重建图像质量的影响则相对较小.It is important to select suitable sampling space and projection data for reducing cost and improving the image reconstruction efficiency in convolution backprojection algorithm.The authors analyzed the influence of projection data and sampling space on the quality of image reconstnuction at different noise level.It was found that the quality of image reconstruction would get worse if the sampling space was too narrow at high noisy level, and projection data had less influence on the quality of image reconstruction than sampling space.

关 键 词：CT 图像重建 图像质量 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP399[自动化与计算机技术—计算机科学与技术]