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Relationship between sphere size and SUVmax at different matrix sizes in the OSEM + PSF + Filter images. The matrix sizes are 128 (a, e, i), 192 (b, f, j), 256 (c, g, k), and 384 (d, h, l) at a TBR of 2 (upper row), 4 (middle row), and 8 (lower row). The SUVmax was higher for smaller matrix sizes and smaller diameters of the hot sphere
