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

Table 3

Estimated noise levels for the real projection data.

Figure 3	(c)			(d)
Real SD	PM	W [18]	FE [17]	PM	W [18]	FE [17]
5	5.30	5.22	6.12*	5.01	5.07	5.83*
6	6.23	6.18	7.08*	6.21	6.05	6.80*
7	7.17	7.18	8.04*	7.11	7.03	7.77*
8	8.12	8.16	9.01*	8.06	8.01	8.75*
9	9.08	9.14	10.00*	9.04	8.99	9.73*
10	10.04	10.14	10.97*	10.00	9.99	10.71*
11	11.25	11.13	11.95*	11.09	10.97	11.70*
12	12.15	12.12	12.93*	12.08	11.95	12.69*
13	13.10	13.11	13.92*	13.04	12.93	13.68*
14	14.03	14.11	14.91*	13.99	13.91	14.67*
15	15.09	15.11	15.90*	14.98	14.92	15.66*