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Spectral extrapolation applied to the Gammex Multi-Energy CT phantom. (1) Chain B CT data (3 cm slice thickness) with labeled material rods (legend in Table 3). The ReconCT reconstruction is shown prior to network evaluation. (2) Initial contrast difference between chain B and chain A. (3) Chain B contrast estimation error following the PLTF. (4) Chain B contrast estimation error following the CNN. Calibration bar units: HU.
