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The corresponding axial slices of Catphan©504 phantom from CBCT reconstructions. Image window: [−180 220]. (a) FDK reconstruction without scatter correction; (b) FDK reconstruction with interpolation scatter correction method; (c) FDK reconstruction with the proposed scatter correction method; (d) reconstructed slice with fan beam MDCT with annulus cover; (e) reconstructed slice with fan beam MDCT without annulus cover; (f) the difference image between (b) and (c).
