Fig. 8

Number of OSEM updates and Gaussian filtering analysis using the normal pituitary gland phantom. The normal pituitary gland phantom was reconstructed using 1-, 2- and 3-mm post-reconstruction Gaussian filters and 3, 5, 7 and 9 numbers of OSEM iterations all with 24 subsets. The central slice of the resulting 12 images are displayed in panels (A–C, E–G, I–K and M–O). The signal along with the horizontal part of the cross-hairs is shown as profiles in panels (D, H, L and P)