Table 2.

RMSE, SSIM, FSIM and CNR comparison between conventional FBP, NLM and ssNLM methods in the MC case.

Region		Lung			Bone			ROI 1	ROI 2
Energy	Method	RMSE	SSIM	FSIM	RMSE	SSIM	FSIM	CNR
80 kVp	FBP	18.383	0.471	0.656	9.628	0.607	0.765	1.2	20.4
	NLM	17.136	0.914	0.924	14.122	0.914	0.897	3.7	27.2
	ssNLM	8.297	0.924	0.969	4.477	0.980	0.966	5.5	56.4
100 kVp	FBP	14.787	0.531	0.695	8.017	0.735	0.814	1.8	19.8
	NLM	10.917	0.957	0.957	6.868	0.964	0.943	6.5	54.6
	ssNLM	7.381	0.973	0.973	3.793	0.983	0.972	6.7	61.1
120 kVp	FBP	14.212	0.559	0.723	7.777	0.733	0.804	2.1	20.8
	NLM	15.583	0.958	0.963	8.505	0.974	0.961	6.6	65.0
	ssNLM	7.417	0.963	0.974	3.557	0.984	0.974	6.9	65.1