TABLE 2.

Contrast-to-noise ratio of lesion in PET images

	FBP	MLEM it50	1U no extra noise	1U extra noise	1U extra noise (noise augmentati on)	3U no extra noise	3U extra noise	3U extra noise (noise augmentati on)
vali#1	7.1 ± 0.82	7.7 ± 0.05	7.0 ± 0.63	9.2 ± 0.46	24.4 ± 0.51	7.9 ± 0.57	8.5 ± 0.40	16.4 ± 0.44
vali#2	7.3 ± 0.02	8.1 ± 0.08	7.6 ± 0.13	10.6 ± 0.13	26.5 ± 3.06	8.5 ± 0.59	10.0 ± 0.61	17.1 ± 1.73
test#1	6.8 ± 0.31	7.2 ± 0.44	7.2 ± 0.05	9.3 ± 0.03	26.8 ± 0.86	7.9 ± 0.17	9.1 ± 0.23	17.0 ± 0.06