Abstract
Dual-dictionary learning (Dual-DL) method utilizes both a low-resolution dictionary and a high-resolution dictionary, which are co-trained for sparse coding and image updating, respectively. It can effectively exploit a priori knowledge regarding the typical structures, specific features, and local details of training sets images. The prior knowledge helps to improve the reconstruction quality greatly. This method has been successfully applied in magnetic resonance (MR) image reconstruction. However, it relies heavily on the training sets, and dictionaries are fixed and nonadaptive. In this research, we improve Dual-DL by using self-adaptive dictionaries. The low- and high-resolution dictionaries are updated correspondingly along with the image updating stage to ensure their self-adaptivity. The updated dictionaries incorporate both the prior information of the training sets and the test image directly. Both dictionaries feature improved adaptability. Experimental results demonstrate that the proposed method can efficiently and significantly improve the quality and robustness of MR image reconstruction.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (No. 813716234), National Basic Research Program of China (2010CB834302), and Shanghai Jiao Tong University Medical Engineering Cross Research Funds (YG2013MS30 and YG2014ZD05).
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Li, J., Song, Y., Zhu, Z. et al. Highly undersampled MR image reconstruction using an improved dual-dictionary learning method with self-adaptive dictionaries. Med Biol Eng Comput 55, 807–822 (2017). https://doi.org/10.1007/s11517-016-1556-z
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DOI: https://doi.org/10.1007/s11517-016-1556-z