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Example of a bile duct used as a landmark in patient #1. a) EE–EI overlay of a coronal section before registration and the surrounding VOI indicated with a rectangle; left arrow indicates a discontinuity in displacement between ribs and liver; b) EE–EI overlay after rigid registration; c) EE–EI overlay after deformable registration. The liver is aligned well but the ribs are not (left arrow), which is due to the discontinuity in displacement not fully accounted for by the DIR.
