13 March 2013 Sparse dictionary representation and propagation for MRI volume super-resolution
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Proceedings Volume 8669, Medical Imaging 2013: Image Processing; 86692N (2013) https://doi.org/10.1117/12.2008145
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States
Abstract
This study addresses the problem of generating a high-resolution (HR) MRI volume from a single low-resolution (LR) MRI input volume. Recent researches have proved that sparse coding can be successfully applied for single-frame super-resolution for natural images, which is based on good reconstruction of any local image patch with a sparse linear combination of atoms taken from an appropriate over-complete dictionary. This study adapts the basic idea of sparse code-based super-resolution (SCSR) for MRI volume data, and then improves the dictionary learning strategy in the conventional SCSR for achieving the precise sparse representation of HR volume patches. In the proposed MRI super-resolution strategy, we only learn the dictionary of the HR MRI volume patches with sparse coding algorithm, and then propagate the HR dictionary to the LR dictionary by mathematical analysis for calculating the sparse representation (coefficients) of any LR local input volume patch. The unknown corresponding HR volume patch can be reconstructed with the sparse coefficients from the LR volume patch and the corresponding HR dictionary. We validate that the proposed SCSR strategy through dictionary propagation can recover much clearer and more accurate HR MRI volume than the conventional interpolated methods.
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Xian-Hua Han, Xian-Hua Han, Yen-Wei Chen, Yen-Wei Chen, } "Sparse dictionary representation and propagation for MRI volume super-resolution", Proc. SPIE 8669, Medical Imaging 2013: Image Processing, 86692N (13 March 2013); doi: 10.1117/12.2008145; https://doi.org/10.1117/12.2008145
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