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Slice cuts from the prior CT image, the LP-CBCT image reconstructed by FDK, the LP-CBCT image estimated by WFD technique, and the reference CBCT image reconstructed by FDK. The LP-CBCT is estimated/reconstructed using 90 half fan projections and the reference CBCT is reconstructed using full sampled 900 half fan projections. Zoom in figures for LP-CBCT and CBCT are placed on the corners of images.
