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Square system matrix: resolution-variance tradeoffs for points at the center of the phantom and at the center of the “hot” and “cold” disks for reconstruction of a 128 × 128 image from a 128 bin × 128 angle sinogram. We show results calculated using both the brute-force approach (“Empirical”) and the analytic expressions (“Analytical”) for both the sinogram- and image-domain approaches.
