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• W1933386811 abstract "To improve the magnetic resonance imaging (MRI) data acquisition speed while maintaining the reconstruction quality, a novel method is proposed for multislice MRI reconstruction from undersampled k-space data based on compressed-sensing theory using dictionary learning.There are two aspects to improve the reconstruction quality. One is that spatial correlation among slices is used by extending the atoms in dictionary learning from patches to blocks. The other is that the dictionary-learning scheme is used at two resolution levels; i.e., a low-resolution dictionary is used for sparse coding and a high-resolution dictionary is used for image updating. Numerical experiments are carried out on in vivo 3D MR images of brains and abdomens with a variety of undersampling schemes and ratios.The proposed method (dual-DLMRI) achieves better reconstruction quality than conventional reconstruction methods, with the peak signal-to-noise ratio being 7 dB higher. The advantages of the dual dictionaries are obvious compared with the single dictionary. Parameter variations ranging from 50% to 200% only bias the image quality within 15% in terms of the peak signal-to-noise ratio.Dual-DLMRI effectively uses the a priori information in the dual-dictionary scheme and provides dramatically improved reconstruction quality." @default.
• W1933386811 created "2016-06-24" @default.
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• W1933386811 date "2013-04-02" @default.
• W1933386811 modified "2023-10-03" @default.
• W1933386811 title "Reconstruction of magnetic resonance imaging by three-dimensional dual-dictionary learning" @default.
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• W1933386811 doi "https://doi.org/10.1002/mrm.24734" @default.
• W1933386811 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23554046" @default.
• W1933386811 hasPublicationYear "2013" @default.
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