Table 1: Variance of the noisy images in Figure 13 based on the noise-free images in Figure 7.

Algorithm value

FDK 1.3986
Hu’s 1.3999
T-FDK 0.27443
CFDKW-1 0.24365
CFDKW-2 0.26443
Zhu et al.’s 1.3999
EM-1 0.24365
EM-2 0.26443