Nonuniform noise propagation by using the ramp filter in fan-beam computed tomography
Nonuniform noise propagation by using the ramp filter in fan-beam computed tomography
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DOI：
10.1109/tmi.2004.826943
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发表时间：
2004-06-01
影响因子：
10.6
通讯作者：
Zeng, GSL
中科院分区：
文献类型：
--
作者：
Zeng, GSL
实验结果表明，在扇束层析成像中，利用斜坡滤波器的均匀特性推导滤波反投影算法时，重建图像具有非平稳频率分量和非平稳噪声。当使用短焦距时，高频分量在图像边缘比在图像中心被放大得更多，从而导致图像边缘的噪声更高。
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.