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. Author manuscript; available in PMC: 2017 Oct 21.
Published in final edited form as: Phys Med Biol. 2016 Oct 3;61(20):7263–7281. doi: 10.1088/0031-9155/61/20/7263

Figure 1.

Figure 1

Schematic of multiresolution forward projection with detector binning. The estimated bone region parameterized using fine grid voxels (μ̂F) is marked with a black dashed line. This region is projected onto native detector pixels (marked with l̂N) using projection operator AFN. The line integrals captured by the native projection pixels also include contributions from a subset of coarse voxels (μ̂C), denoted by projection operator ACN. Line integrals for binned projection pixels (marked as l̂B) traverse only through coarse grid voxels, computed using projector operator ACB.