Sparse Dictionary-Based Magnetic Resonance Superresolution Imaging with Joint Loss Function Learning

Table 1

The PSNR/SSIM values using different block constructed dictionaries (superresolution 1 : 2).

Dictionary block size	Sample set 1	Sample set 2	Sample set 3	Sample set 4	Sample set 5
5 × 5	32.24/0.9407	28.87/0.8996	32.04/0.9302	30.59/0.9145	30.34/0.9208
6 × 6	32.30/0.9412	28.87/0.8984	32.06/0.9309	30.53/0.9060	30.31/0.9084
7 × 7	31.99/0.9328	28.75/0.8875	31.95/0.9251	30.32/0.9025	30.14/0.9003
8 × 8	31.62/0.9297	28.44/0.8716	31.65/0.9195	30.09/0.8894	29.89/0.8936
9 × 9	31.20/0.9158	28.21/0.8658	31.33/0.9102	29.80/0.8721	29.52/0.8835
10 × 10	30.92/0.9021	27.95/0.8513	31.18/0.9031	29.60/0.8684	29.27/0.8748