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The transverse, sagittal, coronal slices of the 4D CBCT and the planning CT and the resulting image matching are shown. The display was quartered. Dual registration was used. The couch was a HexaPOD (6 DOF). Mask (mean if 4D) meant the correction based on the mask area on the average of all phases. Move the slider between Clipbox and Mask, the display of 4D CBCT and the numbers in the table under the slider would change accordingly. So does the correctable error.
