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

Table 3

Comparing criterions of the results reconstructed by different algorithms (head).

Algorithm	Criterion	Noise level
		0.0%	0.1%	0.2%
SART	NMAD (%)	1.0904	2.2017	4.0009
	SNR (dB)	36.8554	31.6575	26.4913
GPBB	NMAD (%)	0.4837	1.1631	2.7798
	SNR (dB)	45.0405	36.7565	29.4104
ADSIR	NMAD (%)	0.5981	0.9370	1.1693
	SNR (dB)	39.0515	34.9548	32.8972
AWR-ADSIR	NMAD (%)	0.6765	0.9438	1.1572
	SNR (dB)	37.7225	34.9687	32.9703