Learned Shrinkage Approach for Low-Dose Reconstruction in Computed Tomography

Table 2

Quantitative measures corresponding to the image array in Figure 15. The SNR is measured in HU window of [−220,350].

Noise level 𝜆0	FBP		PWLS		Shrinkage
	SNR	SSIM	SNR	SSIM	SNR	SSIM
3⋅10^4	21.87	0.75	27.82	0.90	25.39	0.86
9.5⋅10^4	26.53	0.86	28.97	0.91	29.88	0.92
3⋅10^5	28.86	0.91	30.59	0.93	31.65	0.94
9.5⋅10^5	30.67	0.93	32.62	0.95	32.43	0.95
3⋅10^6	32.29	0.95	33.93	0.96	32.85	0.96