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

Figure 5

(a) The reference T2-weighted sagittal view of the lumbar spine. (b) Sampling mask in k-space with 6.09-fold undersampling. (c) PSNR versus noise level for DLMRI, TBMDU, and WTBMDU. ((d), (e), (f) and (g), (h), (i)) Reconstructions and corresponding error magnitudes for DLMRI, TBMDU, and WTBMDU with noise .

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