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(a) Upper row: reconstructed images of a thorax phantom (half-fan mode) using FDK and TF algorithms with and without weighting factors [Display window: (−900, 1775) HU]. “projs” is short for “projections” hereafter. Lower row: profiles crossing the ring-artifacts affected region. (b) Reconstructed images using TF algorithm [Upper row, display window: (−445, 675) HU] with different weighting factors (lower row).
