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

Table 3

Comparison of superresolution PSNR/SSIM for different block and overlap block training dictionaries (superresolution ratio 1 : 2).

Block size	Overlapped block	Sample set 1	Sample set 2	Sample set 3	Sample set 4	Sample set 5
3 × 3	2	31.30/0.9154	28.21/0.8639	31.22/0.8966	30.26/0.9013	29.70/0.8944
4 × 4	3	31.96/0.9273	28.70/0.8834	31.73/0.9143	30.54/0.9087	30.19/0.9123
5 × 5	4	32.24/0.9407	28.87/0.8996	32.03/0.9302	30.59/0.9145	30.34/0.9208
6 × 6	5	32.29/0.9411	28.90/0.9001	32.07/0.9297	30.55/0.9102	30.32/0.9175
7 × 7	6	32.11/0.9328	28.83/0.8926	32.03/0.9274	30.40/0.9056	30.26/0.9122
8 × 8	7	31.90/0.9240	28.71/0.8854	31.93/0.9203	30.26/0.9048	30.08/0.9068
9 × 9	8	31.71/0.9188	28.60/0.8738	31.80/0.9185	30.10/0.9003	29.93/0.9002
10 × 10	9	31.43/0.9201	28.42/0.8687	31.65/0.9033	29.95/0.8875	29.70/0.8917