16 April 2012 A 3D optical flow technique based on mass conservation for deformable motion estimation from 4-D CT images of the lung
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Abstract
The accuracy of optical flow estimation algorithms has been improving steadily by refining the objective function which should be optimized. A novel energy function for computing optical flow from volumetric X-ray CT images is presented. One advantage of the optical flow framework is the possibility to enforce physical constraints on the numerical solutions. The physical constraints which have been included here are: brightness constancy, gradient constancy, continuity equation based on mass conservation, and discontinuity-preserving spatio-temporal smoothness. The method has been evaluated on POPI-model and the evaluation demonstrates that the method results in significantly better accuracy than previous optical flow techniques for estimation of deformable lung motion.
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Mohammadreza Negahdar, Mohammadreza Negahdar, Amir A. Amini, Amir A. Amini, } "A 3D optical flow technique based on mass conservation for deformable motion estimation from 4-D CT images of the lung", Proc. SPIE 8317, Medical Imaging 2012: Biomedical Applications in Molecular, Structural, and Functional Imaging, 83171F (16 April 2012); doi: 10.1117/12.912628; https://doi.org/10.1117/12.912628
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