在扇束计算机断层扫描中使用斜坡滤波器时的非均匀噪声传播。

Nonuniform noise propagation by using the ramp filter in fan-beam computed tomography.

作者信息

Zeng Gengsheng L

机构信息

University of Utah, 729 Arapeen Dr., Salt Lake City, UT 84208-1218, USA.

出版信息

IEEE Trans Med Imaging. 2004 Jun;23(6):690-5. doi: 10.1109/tmi.2004.826943.

DOI:10.1109/tmi.2004.826943

PMID:15191143

Abstract

It is observed that when the homogeneity property of the ramp filter is used to derive a filtered backprojection algorithm in fan-beam tomography, the reconstructed images have nonstationary frequency components and nonstationary noise. When a short focal-length is used, higher frequency components are amplified more at the edge of the image than at the center of the image, resulting in higher noise at the edge of the image.

摘要

据观察，当在扇形束断层扫描中利用斜坡滤波器的均匀性属性来推导滤波反投影算法时，重建图像具有非平稳频率成分和非平稳噪声。当使用短焦距时，高频成分在图像边缘比在图像中心被放大得更多，导致图像边缘处的噪声更高。