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. Author manuscript; available in PMC: 2013 May 30.
Published in final edited form as: IEEE Trans Med Imaging. 2009 Mar;28(3):435–445. doi: 10.1109/TMI.2008.2006518

Fig. 9.

Fig. 9

Sphere phantom in air reconstructed with 20 iterations of list-mode 3D-OSEM on (a) the GPU and (b) the CPU, using Gaussian kernel with 1 mm FWHM. The spheres extend to the edge of the 8 × 8 × 8 cm3 FOV and their size is 1, 1.25, 1.5, and 1.75 mm. The spacing between the centers is twice the diameter. (c) Profile through the 1.75 mm spheres for both reconstructions.