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Titolo:
LMIRA: List-mode iterative reconstruction algorithm for SPECT
Autore:
Bouwens, L; Van de Walle, R; Gifford, H; King, M; Lemahieu, I; Dierckx, RA;
Indirizzi:
State Univ Ghent, ELIS Dept, MEDISIP, IBITECH, B-9000 Ghent, Belgium StateUniv Ghent Ghent Belgium B-9000 IP, IBITECH, B-9000 Ghent, Belgium Fund Sci Res, Flanders, Belgium Fund Sci Res Flanders BelgiumFund Sci Res, Flanders, Belgium Univ Massachusetts, Sch Med, Div Nucl Med, Worcester, MA 01655 USA Univ Massachusetts Worcester MA USA 01655 cl Med, Worcester, MA 01655 USA State Univ Ghent, Dept Nucl Med, B-9000 Ghent, Belgium State Univ Ghent Ghent Belgium B-9000 pt Nucl Med, B-9000 Ghent, Belgium
Titolo Testata:
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
fascicolo: 4, volume: 48, anno: 2001,
parte:, 2
pagine: 1364 - 1370
SICI:
0018-9499(200108)48:4<1364:LLIRAF>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGE-RECONSTRUCTION; LIKELIHOOD; PET;
Keywords:
iterative reconstruction; list mode; single photon emission computed tomography (SPECT);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Bouwens, L State Univ Ghent, ELIS Dept, MEDISIP, IBITECH, B-9000 Ghent, Belgium State Univ Ghent Ghent Belgium B-9000 , B-9000 Ghent, Belgium
Citazione:
L. Bouwens et al., "LMIRA: List-mode iterative reconstruction algorithm for SPECT", IEEE NUCL S, 48(4), 2001, pp. 1364-1370

Abstract

The goal of this project is to investigate a new method for using list-mode data instead of binned projection data for single photon emission computed tomography (SPECT) reconstruction. List-mode acquisition was once standardly available for planar scintigraphy and is now becoming available for SPECT acquisition. We implemented maximum-likelihood iterative reconstruction with list-mode data for SPECT using a new projector/backprojector pair, which employs an intermediate stage to separate the source and camera specificcomponents. In two dimensions, the intermediate stage is a circle surrounding the object. An emission radiance distribution is calculated at the circle from the estimate of the source distribution in the object. This leads to the probability that a photon, coming from the source distribution, leaves the circle surrounding the object at a certain point, going in a specificdirection. The algorithm uses the emission radiance distribution to obtainthe probabilities used in the iterative reconstruction method. The model takes into account distance-dependent resolution and nonuniform attenuation. Results illustrate bow the individual steps of the algorithm work. The list-mode iterative reconstruction algorithm is compared to the standard MLEM iterative reconstruction method, which employs binned data. We conclude that the finer sampling provided by list-mode data results in superior image quality. By using the intermediate stage, we obtained a structure that can very easily be adapted to different types of collimators and acquisition protocols.

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Documento generato il 19/01/20 alle ore 06:05:34