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(a) Cardiac and respiratory motion models of the surface-based XCAT (left) and VIP-Man (right) phantoms. Transformations are applied to the surfaces to deform them. (b) 4D voxelized respiratory phantom of Han et al. [25]. Transforms are applied to the individual voxels to deform the image. Full animation of the respiratory motion and deformation can be found elsewhere (http://hurel.hanyang.ac.kr/Phantom/4DVoxel.gif)
