A Model of Regularization Parameter Determination in Low-Dose X-Ray CT Reconstruction Based on Dictionary Learning

Table 1

Quantitative evaluation of the results with different regularization parameters.

Noise level	()			NMAD (%)	SNR (dB)
0.0%	1.7094	0.9005		1.5819	35.5246
				1.2406	37.6730
				2.0147	32.9517
0.1%	2.5269	5.7462		2.0371	33.1220
				1.8742	34.5110
				2.1561	32.4527