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(Left) Uniformity index for each system, including results for nominal Catphan phantom thickness (20.5 cm) and results with additional phantom thickness (30.5 cm total thickness). The error bars represent the standard deviation. (Right) Horizontal intensity profiles through the uniformity module (CTP486-2) of the Catphan phantom. The OBI CBCT system is susceptible to ring artifacts in both geometries, while the XVI system exhibits cupping artifact in the nominal scan.
