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Sample colored warped images overlaid on greyscale baseline images depicting the range of magnitudes of synthetic B‐spline warped images used for validation of thoracic CT registrations: axial (a) and coronal (b) views of images that differ by a displacement error of 4.6 mm and an axial displacement error of 3.4 mm; axial (c) and coronal (d) views of images that differ by a displacement error of 9.4 mm and an axial displacement error of 7.1 mm.
