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Image uniformity. (a) Magnitude of cupping in the transverse plane for helical and axial mode, averaged over three reconstruction filters. (b) Transverse slice of a 20–cm‐diameter water phantom positioned 5 cm below isocenter, showing nonuniformity introduced by positioning off isocenter. (c) Coronal slice of the water phantom, helical and axial mode, illustrating stitching artifacts for the latter.
