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

Table 8

Comparison of the quality of several superresolution reconstructed images.

Image	The multiple of image superresolution	Bicubic interpolation	Nearest neighbor image block	Joint dictionary	Dictionary optimization algorithm
Neck1	2	37.84/0.9473	33.19/0.9002	40.29/0.9751	41.24/0.9839
	4	30.84/0.8856	26.92/0.8027	31.95/0.9042	31.98/0.9102
Neck2	2	34.30/0.9166	30.57/0.8695	37.78/0.9503	38.09/0.9584
	4	27.74/0.8211	25.70/0.7834	29.10/0.8497	29.95/0.8562
Neck3	2	35.50/0.9004	31.31/0.8712	36.68/0.9179	36.95/0.9203
	4	28.80/0.8329	26.28/0.7998	30.05/0.8712	30.14/0.8744
Ankle1	2	31.31/0.8834	30.03/0.8587	34.57/0.9199	35.07/0.9257
	4	26.72/0.8003	22.07/0.7105	27.56/0.8262	27.74/0.8310
Ankle2	2	30.52/0.8781	28.92/0.8398	32.48/0.9087	32.55/0.9132
	4	25.50/0.7858	22.40/0.7416	26.31/0.8200	26.31/0.8211
Ankle3	2	33.26/0.9072	30.21/0.8708	33.89/0.9163	34.48/0.9214
	4	29.06/0.8587	24.05/0.7729	30.02/0.8711	30.35/0.8842