DocumentCode :
1123616
Title :
Application of expectation maximization algorithms for image resolution improvement in a small animal PET system
Author :
Antich, Pietro ; Parkey, Robert ; Seliounine, Serguei ; Slavine, Nikolai ; Tsyganov, Edward ; Zinchenko, Alexander
Author_Institution :
Southwestern Med. Center, Univ. of Texas, Dallas, TX, USA
Volume :
52
Issue :
3
fYear :
2005
fDate :
6/1/2005 12:00:00 AM
Firstpage :
684
Lastpage :
690
Abstract :
Modern positron emission tomography (PET) systems, offering high counting rate capabilities, high sensitivity, and near-submillimeter coordinate resolution, require fast image reconstruction software that can operate on list-mode data and take into account most of finite resolution effects such as photon scattering, positron range in tissue, and detector features. It has already been demonstrated that the expectation maximization (EM) method with extended system matrix modeling looks very attractive for image resolution recovery in PET imaging studies. In this paper, the performance of EM-based algorithms (in particular, their ability to improve the image resolution) is evaluated for a small animal PET imager with several phantoms. The achievement of a substantial decrease in processing time using an EM deblurring procedure is shown, as is an approach to successfully treat what are essentially nonspace-invariant resolution effects within a shift-invariant model.
Keywords :
biological tissues; image reconstruction; image resolution; medical image processing; phantoms; positron emission tomography; expectation maximization algorithms; image reconstruction software; image resolution; nonspace-invariant resolution effects; phantoms; photon scattering; positron emission tomography; shift-invariant model; small animal PET system; submillimeter coordinate resolution; tissue; Animals; Application software; Computer vision; Detectors; Electromagnetic scattering; Image reconstruction; Image resolution; Particle scattering; Positron emission tomography; Single photon emission computed tomography; Iterative image reconstruction; positron emission tomography (PET); small animal imaging;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2005.851479
Filename :
1487700
Link To Document :
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