A study of certain characteristics of the EM algorithm for image reconstruction in positron emission tomography

Author

Kontaxakis, G. ; Tzanakos, G.

Author_Institution

Dept. of Electr. Eng., Rutgers Univ., Piscataway, NJ, USA

fYear

1992

fDate

1992

Firstpage

89

Lastpage

90

Abstract

The authors studied certain characteristics of the expectation-maximization (EM) algorithm for image reconstruction in positron emission tomography (PET). They have attempted to speed up the algorithm by performing some time-consuming computation only once, at the initiation stage. They have studied the resulting memory size, disk space, and CPU requirements versus the number of pixels in the reconstructed image and the number of gamma -ray detectors in the tomograph. The convergence and image quality have been studied as a function of the number of iterations performed. Preliminary results are presented.

Keywords

computerised tomography; image reconstruction; iterative methods; maximum likelihood estimation; medical image processing; radioisotope scanning and imaging; CPU requirements; EM algorithm; PET; convergence; disk space; expectation maximisation algorithm; gamma -ray detectors; image quality; image reconstruction; initiation stage; iterations; memory size; pixels; positron emission tomography; speed; time-consuming computation; tomograph; Biomedical engineering; Detectors; Event detection; Image reconstruction; Iterative algorithms; Physics; Pixel; Positron emission tomography; Radioactive decay; Sparse matrices;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioengineering Conference, 1992., Proceedings of the 1992 Eighteenth IEEE Annual Northeast

Conference_Location

Kingston, RI, USA

Print_ISBN

0-7803-0902-2

Type

conf

DOI

10.1109/NEBC.1992.285968

Filename

285968