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(a) The reference image of the POPI-modeled patient. (b) The warped moving image of the POPI-modeled patient. (c) The difference image between the reference and the warped moving images. (d) The difference image between the reference and the original moving images. The images in (a) and (b) are displayed at the window and level of 500/180, and the images in (c) and (d) are at the window and level of 500/50.
