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The LOR-PDF for LORs with ending-side that is two detector blocks to the right of the opposing detector block across the FOV, φ = [−2.5°, 2.5°], b =14, and θ = [−5.5°, 5.5°] . The top row shows the LOR-PDFs using a common intensity scale while, in the bottom row, each 2D LOR-PDF segment is scaled to its own maximum. The LOR-PDF of this LOR group is asymmetric in the r direction. Shape changes along the LOR depth from starting-side to ending-side (left to right) are also clear.
