Magnetic resonance image reconstruction from undersampled measurements using a patch-based nonlocal operator

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	Magnetic resonance image reconstruction from undersampled measurements using a patch-based nonlocal operator
	Qu, Xiaobo ; Hou, Yingkun ; Lam, Fan ; Guo, Di ; Zhong, Jianhui ; Chen, Zhong ; Qu XB(屈小波) ; Chen Z(陈忠)
刊名	http://dx.doi.org/10.1016/j.media.2013.09.007
	2014
关键词	Compressed sensing Image reconstruction
英文摘要	Compressed sensing MRI (CS-MRI) has shown great potential in reducing data acquisition time in MRI. Sparsity or compressibility plays an important role to reduce the image reconstruction error. Conventional CS-MRI typically uses a pre-defined sparsifying transform such as wavelet or finite difference, which sometimes does not lead to a sufficient sparse representation for the image to be reconstructed. In this paper, we design a patch-based nonlocal operator (PANO) to sparsify magnetic resonance images by making use of the similarity of image patches. The definition of PANO results in sparse representation for similar patches and allows us to establish a general formulation to trade the sparsity of these patches with the data consistency. It also provides feasibility to incorporate prior information learnt from undersampled data or another contrast image, which leads to optimized sparse representation of images to be reconstructed. Simulation results on in vivo data demonstrate that the proposed method achieves lower reconstruction error and higher visual quality than conventional CS-MRI methods. ? 2013 Elsevier B.V.
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/92287]
专题	物理技术－已发表论文
推荐引用方式 GB/T 7714	Qu, Xiaobo,Hou, Yingkun,Lam, Fan,et al. Magnetic resonance image reconstruction from undersampled measurements using a patch-based nonlocal operator[J]. http://dx.doi.org/10.1016/j.media.2013.09.007,2014.
APA	Qu, Xiaobo.,Hou, Yingkun.,Lam, Fan.,Guo, Di.,Zhong, Jianhui.,...&陈忠.(2014).Magnetic resonance image reconstruction from undersampled measurements using a patch-based nonlocal operator.http://dx.doi.org/10.1016/j.media.2013.09.007.
MLA	Qu, Xiaobo,et al."Magnetic resonance image reconstruction from undersampled measurements using a patch-based nonlocal operator".http://dx.doi.org/10.1016/j.media.2013.09.007 (2014).