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Plots of FWHM widths with increasing iterations for a point source 10 cm away from the center of the FoV. In (a) and (b), voxels of size 2.34 mm[x/y] by 3.27 mm[z] were used, while in (c) smaller voxels of size 1.20 mm[x/y] by 3.27 mm[z] were used (21 subsets in each iteration)