Superiorization of Incremental Optimization Algorithms for Statistical   Tomographic Image Reconstruction
  We propose the superiorization of incremental algorithms for tomographic image reconstruction. The resulting methods follow a better path in its way to finding the optimal solution for the maximum likelihood problem in the sense that they are closer to the Pareto optimal curve than the non-superiorized techniques. A new scaled gradient iteration is proposed and three superiorization schemes are evaluated. Theoretical analysis of the methods as well as computational experiments with both synthetic and real data are provided. 
Elias S. Helou, Marcelo V. W. Zibetti, Eduardo X. Miqueles
math.OC