SVD ANALYSIS OF BACKPROJECTING OPERATOR OF ML-EM PET IMAGE RECONSTRUCTION

Vencel Somai, David Legrady, Gabor Tolnai

Abstract


We have demonstrated that a full Monte Carlo modelling in the backprojecting step of maximum likelihood expectation maximization image reconstruction of positron emission tomography may lead to deteriorated image quality by decelerating iteration convergence. The reasons behind this apparently anomalous behaviour is analysed in a simplified system by means of singular value decomposition and a new filtering technique is proposed for real systems. Some theoretical considerations for further development are also presented.


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RADIOLOGY AND ONCOLOGY, Association of Radiology and Oncology,
Zaloska 2, P.O.Box 2217, SI-1000 Ljubljana, Slovenia, T/F: +386 1 5879 434, Open access on the web: ISSN 1518-3207, De Gruyter
Published by computing.si