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

Table 4

Comparison of superresolution PSNR for different block and overlap block training dictionaries (superresolution ratio 1 : 4).

Block size	Overlapped block	Sample set 1	Sample set 2	Sample set 3	Sample set 4	Sample set 5
3 × 3	2	29.22/0.8619	25.05/0.7746	28.78/0.8607	26.91/0.8014	27.11/0.8273
4 × 4	3	29.45/0.8677	25.16/0.7832	28.93/0.8704	26.97/0.8085	27.26/0.8344
5 × 5	4	29.82/0.8755	25.34/0.7913	29.16/0.8758	27.09/0.8172	27.54/0.8401
6 × 6	5	30.19/0.8824	25.57/0.7988	29.43/0.8812	27.26/0.8200	27.81/0.8503
7 × 7	6	30.63/0.8875	25.72/0.8104	29.68/0.8875	27.30/0.8276	28.06/0.8556
8 × 8	7	30.80/0.8908	25.88/0.8233	29.96/0.8908	27.35/0.8302	28.25/0.8623
9 × 9	8	30.92/0.8994	25.94/0.8399	30.03/0.8966	27.43/0.8483	28.30/0.8701
10 × 10	9	31.11/0.9109	25.96/0.8487	30.15/0.9043	27.44/0.8514	28.31/0.8722
11 × 11	10	30.91/0.9025	25.91/0.8410	30.09/0.9002	27.32/0.8311	28.22/0.8614
12 × 12	11	30.87/0.8902	25.90/0.8315	30.05/0.8954	27.30/0.8292	28.17/0.8600
13 × 13	12	30.63/0.8843	25.76/0.8184	29.88/0.8871	27.19/0.8145	27.98/0.8496