April 2024
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... The refined deformation field ϕ * STN is obtained by combining the predicted deformation field (ϕ) from U-Net with the local spatial transformations predicted by STN as in Equation 7. The combined deformation field (ϕ * STN ) captures both global and local deformations in the input images, leading to improved registration accuracy. Various optimization algorithms can be employed to solve the DIR problem, including gradient descent-based methods, genetic algorithms, and finite element methods [42], [43]. These algorithms iteratively update the deformation field (ϕ) until convergence to the optimal solution. ...
April 2024