Table 2.

Calculated recovery coefficient and contrast recovery and background noise for the images of NEMA IQ phantom for different image reconstruction and radionuclide combinations.

Sphere size	Radionuclide	Recovery coefficient			Contrast recovery [%]
		OSEM	PRC	Relative difference [%]	OSEM	PRC
10 mm	18F	0.54	0.53	−2.34	42.8	41.2
	68Ga	0.37	0.49	32.51	28.4	42.2
	124I	0.39	0.53	36.52	23.8	41.6
13 mm	18F	0.62	0.61	−1.8	52.5	51.1
	68Ga	0.56	0.68	21.5	49.3	63.0
	124I	0.50	0.63	25.0	38.1	53.9
17 mm	18F	0.73	0.72	−1.8	66.6	64.9
	68Ga	0.61	0.68	10.1	55.8	62.9
	124I	0.64	0.73	15.4	54.5	66.8
22 mm	18F	0.82	0.80	−1.7	77.2	75.5
	68Ga	0.67	0.73	7.7	62.7	68.6
	124I	0.75	0.81	8.2	68.8	76.5
28 mm	18F	0.84	0.81	−2.9	79.6	76.6
	68Ga	0.72	0.79	8.7	68.5	75.8
	124I	0.77	0.83	7.8	71.5	79.1
37 mm	18F	0.87	0.85	−1.8	83.9	81.9
	68Ga	0.78	0.82	5.5	75.1	80.0
	124I	0.85	0.88	4.4	80.7	85.3
Background noise [%]
	18F	10.1	9.30	−8.3
	68Ga	17.7	15.7	−11.0
	124I	9.7	9.35	−3.8

¹⁸F images (both OSEM and PRC) were reconstructed with 3 iterations and 12 subsets, while ⁶⁸Ga and ¹²⁴I images with 2 iterations and 12 subsets for OSEM and 8 iterations as 12 subsets for PRC.