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Left: Measured MDRF of the prototype detector without optical barriers, created by scanning a thin beam of 662‐keV gamma‐ray photons (0.44 mm × 0.44 mm, FWHM), in a regular array of positions across the detector. Right: The best spatial resolution achievable with these MDRFs, as predicted by calculation of the Cramér‐Rao lower bound on mean variance between X‐ and Y‐direction.
