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. Author manuscript; available in PMC: 2013 Jul 23.
Published in final edited form as: Phys Med Biol. 2009 Aug 4;54(17):5073–5094. doi: 10.1088/0031-9155/54/17/001

Figure 12.

Figure 12

Hot spheres in an air phantom, reconstructed with 50 iterations of list-mode 3D-OSEM. Ten million events were included in each subset. The spheres extend to the edge of the 8 × 8 × 8 cm3 FOV, and their diameters are 1, 1.25, 1.5 and 1.75 mm, respectively. The spacing between the centers is twice the diameter. Four positioning schemes were used: (a) EI, (b) MAP, (c) MPD and (d) EWM. No post-processing was performed. The intensity scale was chosen to maximize the dynamic range. The intensity bar units are arbitrary.