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

Figure 4

(a) The reference noncontrast MRA of the Circle of Willis. ((b) and (c)) The PSNR and HFEN values versus acceleration factor for the three methods DLMRI, TBMDU, and WTBMDU at 2.5-, 4-, 6-, 8-, 10-, and 20-fold acceleration. ((d), (e), and (f)) Reconstruction error magnitudes for DLMRI, TBMDU, and WTBMDU at 10-fold acceleration, respectively.

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