• DocumentCode
    1145107
  • Title

    On the Iterative Image Space Reconstruction Algorthm for ECT

  • Author

    Titterington, D.M.

  • Volume
    6
  • Issue
    1
  • fYear
    1987
  • fDate
    3/1/1987 12:00:00 AM
  • Firstpage
    52
  • Lastpage
    56
  • Abstract
    The ISRA of [1] is shown to be an iterative algorithm that aims to converge to the least-squares estimates of emission densities. Convergence is established in the case where a unique least-squares estimate exists that is, elementwise, strictly positive. It is pointed out that, in terms of asymptotic theory, the resulting estimators are inferior to the maximum likelihood estimators, for which the EM algorithm is a computational procedure. Potential difficulties with the behavior of the ISRA are illustrated using very simple examples.
  • Keywords
    Convergence; Electrical capacitance tomography; Estimation theory; Image converters; Image reconstruction; Iterative algorithms; Maximum likelihood detection; Maximum likelihood estimation; Reconstruction algorithms; Recursive estimation;
  • fLanguage
    English
  • Journal_Title
    Medical Imaging, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0278-0062
  • Type

    jour

  • DOI
    10.1109/TMI.1987.4307797
  • Filename
    4307797
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1145107