A Weighted Two-Level Bregman Method with Dictionary Updating for Nonconvex MR Image Reconstruction

Figure 3

(a) The reference image. ((b) and (c)) The PSNR and HFEN value versus undersampling factor for three methods DLMRI, TBMDU, and WTBMDU at 2.5-, 4-, 6-, 8-, 10-, and 20-fold undersampling. ((d), (e), (f) and (g), (h), (i)) Reconstructions and corresponding error magnitudes for DLMRI, TBMDU, and WTBMDU at 10-fold undersampling, respectively.

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