The adaptive sinogram restoration algorithm based on anisotropic diffusion by energy minimization for low-dose X-ray CT

被引：15

作者：

Cui, Xueying ^{[1
,2
]}

Zhang, Quan ^{[1
]}

Hong Shangguan ^{[1
]}

Liu, Yi ^{[1
]}

Gui, Zhiguo ^{[1
]}

机构：

[1] North Univ China, Natl Key Lab Elect Measurement Technol, Taiyuan 030051, Peoples R China

[2] Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Peoples R China

来源：

OPTIK | 2014年 / 125卷 / 05期

关键词：

Low-dose CT; Noise reduction; Streak artifacts; Anisotropic diffusion; COMPUTED-TOMOGRAPHY; NOISE-REDUCTION;

D O I：

10.1016/j.ijleo.2013.10.005

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Apparent streak artifacts will present in reconstructed images due to excessive quantum noise in low-dose X-ray imaging process. Estimating a noise-free sinogram to satisfy the filtered back-projection (FBP) reconstruction is an effective way to solve this problem. In this paper, we propose a novel sinogram noise reduction method by energy minimization. An adaptive smoothness parameter based on a modified anisotropic diffusion coefficient is applied for an optimal estimation. The smoothness parameter can make the method effectively adjust the degree of smoothness according to the noise level and the region feature in the sinogram. Visual effect together with quantitative analysis of the experimental result shows the developed approach has the excellent performance in protection of the edge and removal of streak artifacts in the reconstructed image. (C) 2013 Elsevier GmbH. All rights reserved.

引用

页码：1694 / 1697

页数：4

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