Spatial resolution of few-view computed tomography using algebraic reconstruction techniques

Spatial resolution of computed tomography using two modified algebraic reconstruction algorithms is studied theoretically and experimentally for the case when several projections are recorded. A simple setup with gamma rays recording on a screened photographic film is used for registration of X-ray projections. A standard phantom with periodic spatial structures in the form of cylindrical rods is irradiated, its cross section is reconstructed, and the modulation transfer function is estimated. It is shown that the multiplicative algebraic reconstruction technique optimizing the entropy provides a better resolution (about 1.5 mm for four projections). © Pleiades Publishing, Inc. 2006.