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Background variation added to investigate the effect of heterogeneous absorption: z = 3.0 cm slice shown. (a) High variance background variation. (b) Low variance background variation. (c) Reconstruction in case of high variance background variation. (d) Reconstruction in case of low variance background variation. (e) Isosurface of voxel-based reconstruction given high variance background variation. (f) Isosurface of voxel-based reconstruction given high variance background variation.
