Tomography by Fourier synthesis
  We consider a particular approach to the regularization of the inverse problem of computerized tomography. This approach is based on notions pertaining to Fourier synthesis. It refines previous contributions, in which the preprocessing of the data was performed according to the Fourier slice theorem. Since real models must account for the geometrical system response and possibly Compton scattering and attenuation, the Fourier slice theorem does not apply, yielding redefinition of the preprocessing. In general, the latter is not explicit, and must be performed numerically. The most natural choice of preprocessing involves the computation of unstable solutions. A proximal strategy is proposed for this step, which allows for accurate computations and preserves global stability of the reconstruction process. 
Pierre Mar\'echal and Abdelhadi Elasmai
math.OC