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

Table 1

The reconstruction PSNR values of the axial T2-weighted brain image at different sampling trajectories with the same undersampling percentage using different methods.

Sampling mask	2D random sampling	Spiral sampling	Cartesian sampling	Radial sampling
DLMRI	40.54	37.12	35.78	35.32
TBMDU	44.01	38.54	37.41	36.06
WTBMDU-L2, = 0.3	45.42	38.31	37.32	36.55
WTBMDU-L2, = 0.5	44.94	38.86	37.61	36.82
WTBMDU-L2, = 0.7	44.78	39.22	37.70	36.95
WTBMDU-L1, = 0.3	45.20	38.82	37.62	36.80
WTBMDU-L1, = 0.5	44.88	39.20	37.73	37.16
WTBMDU-L1, = 0.7	45.18	39.15	38.08	37.06