An introduction to iterative reconstruction

RESUMO

Most people are familiar with filtered back projection and the associated filtering necessary to reconstruct data in emission tomography. However, filtered back projection has some limitations, particularly when there is need to incorporate accurate attenuation correction. The alternative is to adopt an iterative reconstruction technique, which more readily can incorporate attenuation correction as well as having attractive noise properties. The objective of this paper is to present basic concepts with emphasis on maximum likelihood reconstruction. The availability of acceleration techniques has enhanced the applicability of iterative techniques in clinical practice