Table 3.

Quantitative evaluation results of the head phantom studies with noise-free projections.

		PSNR	NMAD	SSIM
Bone percentage	Image-based Method	19.48	0.8836	0.9363
	EDEC Method	24.73	0.3482	0.9372
	NLM Method	19.63	0.8681	0.9388
	WLS-NLM Method	19.52	0.8836	0.9378
	MDIR Method	23.92	0.4975	0.9531
	E-SART Method	29.80	0.1865	0.9565
	Proposed Method	32.54	0.0806	0.9833
Water density	Image-based Method	11.99	0.8412	0.6795
	EDEC Method	24.17	0.1406	0.7324
	NLM Method	11.98	0.8426	0.6781
	WLS-NLM Method	12.11	0.8067	0.6517
	MDIR Method	26.75	0.1114	0.7292
	E-SART Method	27.54	0.1009	0.7419
	Proposed Method	32.85	0.0259	0.9473
70 KeV μ–image	Image-based Method	13.32	0.5146	0.6520
	EDEC Method	17.95	0.2498	0.6716
	NLM Method	13.36	0.5190	0.6615
	WLS-NLM Method	13.41	0.5070	0.6539
	MDIR Method	21.85	0.1607	0.6820
	E-SART Method	22.77	0.1459	0.6891
	Proposed Method	30.21	0.0349	0.8824