NDLI: Compressed sensing magnetic resonance imaging based on dictionary updating and block-matching and three-dimensional filtering regularisation

Content Provider	IET Digital Library
Author	Shi, Baoshun Lian, Qiusheng Chen, Shuzhen
Abstract	Compressed sensing (CS) enables that magnetic resonance (MR) images can be exactly reconstructed from undersampled k-space data by exploiting the sparsity of MR images in some analytical sparsifying transform or some dictionary. Recent methods are exploiting adaptive patch-based dictionaries for image recovery by alternating between dictionary learning step and image reconstruction step. In this study, the authors propose a novel MR image reconstruction algorithm utilising dictionary updating, which consists of three steps: sparse coding, dictionary updating and image reconstruction. In the dictionary updating step, they perform a first-order series expansion for dictionary–coefficient matrix product via recursive method, and propose an efficient method to solve the new dictionary updating problem. To improve the reconstruction quality, the proposed block-matching and three-dimensional (3D) filtering regularisation is incorporated into the authors’ image CS recovery, which can combine the self-similarities within the image, the 3D transform sparsity and the local sparsity into image recovery process. Experimental simulations demonstrate their proposed algorithms can obtain better reconstruction quality than the previous CS algorithms.
Starting Page	68
Ending Page	79
Page Count	12
ISSN	17519659
Volume Number	10
e-ISSN	17519667
Issue Number	Issue 1, Jan (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-ipr/10/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-ipr.2014.0870
Journal	IET Image Processing
Publisher Date	2016-01-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3D Filtering Regularisation Biology And Medical Computing Biomedical Magnetic Resonance Imaging Biomedical MRI Block Matching Compressed Sensing Compressed Sensing Magnetic Resonance Imaging Computer Vision And Image Processing Technique Dictionary Updating Dictionary–coefficient Matrix Product Image Reconstruction Medical Image Processing Medical Magnetic Resonance Imaging And Spectroscopy Optical, Image And Video Signal Processing Patient Diagnostic Method And Instrumentation Recursive Method Spectroscopy
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering Computer Vision and Pattern Recognition Software

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