Sinogram constrained TV-minimization for metal artifact reduction in CT
  A new method for reducing metal artifacts in X-ray computed tomography (CT) images is presented. It bases on the solution of a convex optimization problem with inequality constraints on the sinogram, and total variation regularization for the reconstructed image. The Chambolle-Pock algorithm is used to numerically solve the discretized version of the optimization problem. As proof of concept we present and discuss numerical results for synthetic data. 
Clemens Schiffer and Kristian Bredies
math.NA cs.CV physics.med-ph