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

Table 2

Comparing criterions of the results reconstructed by different algorithms (Shepp-Logan).

Algorithm	Criterion	Noise level
		0.0%	0.1%	0.2%
SART	NMAD (%)	2.1510	2.9273	4.1032
	SNR (dB)	33.5448	31.5220	28.7997
GPBB	NMAD (%)	1.3472	1.7826	3.0473
	SNR (dB)	36.5443	34.6140	30.5004
ADSIR	NMAD (%)	0.8110	0.9553	1.1823
	SNR (dB)	35.7740	34.8516	33.3413
AWR-ADSIR	NMAD (%)	0.8223	1.0639	1.1549
	SNR (dB)	35.5354	34.5480	33.7801