Table 1.

Contrast recovery and background variability parameters when applying MR-based AC

Sphere size [mm]	Radioactive / Non-radioactive	aContrast recovery [%]	aBackground variability [%]
10	Radioactive	16.8 ± 1.9	4.8 ± 0.8
13	Radioactive	31.7 ± 2.9	4.0 ± 0.4
17	Radioactive	52.7 ± 3.0	3.6 ± 0.3
22	Radioactive	64.8 ± 4.1	3.4 ± 0.4
28	Non-radioactive	68.9 ± 1.5	3.2 ± 0.4
37	Non-radioactive	76.1 ± 0.6	3.1 ± 0.3

^a The values represent the mean values and standard deviation of four independent measurements for the reconstruction: 3 iterations, 21 subsets, 172 matrix and 4 mm Gaussian filtering