Removal of truncation artefacts in magnetic resonance images by recovering missing spectral data
Removal of truncation artefacts in magnetic resonance images by recovering missing spectral data
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DOI：
10.1016/j.jmr.2012.08.014
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发表时间：
2012-11-01
影响因子：
2.2
通讯作者：
Zhu, Yuemin
中科院分区：
文献类型：
--
作者：
Luo, Jianhua;Wang, Shanshan;Zhu, Yuemin
截断伪影经常出现在许多存档的临床磁共振(MR)图像中，这是因为需要通过对其k空间的一部分进行采样来缩短采集时间。这种人为的信息降低了图像的质量，并可能阻碍临床诊断。在本文中，我们提出了一种新的方法，通过恢复丢失的k空间或谱数据来去除伪影。该方法包括四个步骤：(A)从包含截断伪影的图像估计截断k空间，(B)从估计的截断k空间计算图像的差图像的稀疏表示的参数，(C)使用(B)中计算的参数恢复丢失的光谱数据，以及(D)通过估计的光谱数据和恢复的光谱数据的逆傅立叶变换获得去除伪影的图像。对模拟和真实MR图像的实验表明，该方法在保持图像质量的同时有效地去除了截断伪影，并优于传统的Hamming窗方法和流行的TV方法。(C)2012 Elsevier Inc.保留所有权利。
Truncation artefacts are often present in many archived clinical magnetic resonance (MR) images due to the need of shortening the acquisition time by sampling a part of their k-space. This artificial information degrades the quality of the image and may hamper clinical diagnosis. In this paper, we propose a novel method to remove the artefacts by recovering the missing k-space or spectral data. The method consists of four steps: (a) estimating the truncated k-space from the images containing truncations artefacts, (b) computing the parameters of the sparse representation of the difference image of an image from the estimated truncated k-space, (c) recovering the missing spectral data using the parameters computed in (b), and (d) obtaining the artefact-removed image through inverse Fourier transform of the estimated and the recovered spectral data. Experiments on both simulated and real MR images have shown that the proposed method effectively removes truncation artefacts while preserving image quality and outperforms both the conventional Hamming window method and the popular TV method. (C) 2012 Elsevier Inc. All rights reserved.