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Reconstruction of the cold rod grid phantom located 170 mm off the central axis of the scanner after 15 iterations. The rods’ diameters are, from largest to smallest, 12.7, 11.1, 9.5, 7.9, 6.4, and 4.8 mm. The four largest rods can clearly be discerned on all of the images except the LOR-OSEM.
