Binary steering in discrete tomography reconstruction with sequential and simultaneous iterative algorithms

The binary steering process is a heuristic designed to intervene between consecutive steps of a nonbinary iterative image reconstruction algorithm in order to gradually steer the iterates towards a binary solution. We present computational results which show that a strongly overrelaxed simultaneous nonbinary iterative algorithm performs in our experiments better than a strongly underrelaxed sequential iterative algorithm. We also notice that faster binary steering gives better binary reconstructed images when the sequential iterative nonbinary algorithm is used. (C) 2001 Elsevier Science Inc. All rights reserved.