Noise Estimation for Single-Slice Sinogram of Low-Dose X-Ray Computed Tomography Using Homogenous Patch

Table 2

Estimated noise levels for the phantoms.

Figure 3	(a)			(b)			(c)
Real SD	PM	W [18]	FE [17]	PM	W [18]	FE [17]	PM	W [18]	FE [17]
5	5.57*	4.93	5.31	4.90	4.91	6.11*	5.05	4.98	5.40*
6	6.51*	5.91	6.30	5.88	5.89	7.10*	6.03	5.93	6.39*
7	7.45*	6.87	7.28	6.86	6.87	8.10*	7.03	6.89	7.38*
8	8.40*	7.84	8.27	7.84	7.85	9.10*	8.02	7.85	8.38*
9	9.37*	8.81	9.26	8.82	8.83	10.08*	9.02	8.82	9.37*
10	10.35*	9.77	10.25	9.81	9.81	11.08*	10.01	9.79	10.37*
11	11.33*	10.75	11.24	10.79	10.80	12.07*	11.01	10.76	11.37*
12	12.26	11.72	12.23	11.77	11.79	13.07*	12.00	11.75	12.37*
13	13.24	12.67	13.22	12.75	12.77	14.06*	13.00	12.73	13.37*
14	14.24	13.64*	14.21	13.73	13.75	15.06*	14.00	13.69	14.37*
15	15.41	14.60	15.20	14.71	14.74	16.06*	14.99	14.69	15.38*