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Forward projection model used in forward and back projection: Ray-driven calculations are decomposed into transaxial (A) and axial (B) components. For a chosen transaxial voxel position, all the computations are performed axially, leading to storing the projection data along the Michelogram diagonals (C) (shown is Michelogram patch with sampling along the direct [R D = 0] and oblique [R D = ± 8] sinograms)
