Fig. 6

¹²⁴I activity concentration in the phantom’s spheres as a function of increasing ¹³¹I activity in the background measured on the PET image reconstructed with the OSEM algorithm with 100 iterations and 16 subsets. In a, the phantom was centered and reconstructed with TOF information. In b, the phantom was off-center and reconstructed with TOF information. In c, the phantom was centered and reconstructed without TOF information. And in d, the phantom was off-center and reconstructed without TOF information