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Titolo:
An iterative maximum-likelihood polychromatic algorithm for CT
Autore:
De Man, B; Nuyts, J; Dupont, P; Marchal, G; Suetens, P;
Indirizzi:
Univ Hosp Gasthuisberg, Dept Nucl Med, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg Louvain Belgium B-3000 d, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg, Dept Radiol, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg Louvain Belgium B-3000 l, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg, Radiol ESAT PSI, B-3000 Louvain, Belgium Univ HospGasthuisberg Louvain Belgium B-3000 I, B-3000 Louvain, Belgium
Titolo Testata:
IEEE TRANSACTIONS ON MEDICAL IMAGING
fascicolo: 10, volume: 20, anno: 2001,
pagine: 999 - 1008
SICI:
0278-0062(200110)20:10<999:AIMPAF>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAY COMPUTED-TOMOGRAPHY; BEAM HARDENING CORRECTION; METAL STREAK ARTIFACTS; IMAGE-RECONSTRUCTION; PROJECTION DATA; TRANSMISSION; EMISSION; NOISE; BONE; SIMULATION;
Keywords:
beam-hardening correction; computed tomography; iterative reconstruction; maximum likelihood;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Engineering, Computing & Technology
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Nuyts, J Univ Hosp Gasthuisberg, Dept Nucl Med, B-3000 Louvain, Belgium Univ Hosp Gasthuisberg Louvain Belgium B-3000 Louvain, Belgium
Citazione:
B. De Man et al., "An iterative maximum-likelihood polychromatic algorithm for CT", IEEE MED IM, 20(10), 2001, pp. 999-1008

Abstract

A new iterative maximum-likelihood reconstruction algorithm for X-ray computed tomography is presented. The algorithm prevents beam hardening artifacts by incorporating a polychromatic acquisition model. The continuous spectrum of the X-ray tube is modeled as a number of discrete energies. The energy dependence of the attenuation is taken into account by decomposing the linear attenuation coefficient into a photoelectric component and a Compton scatter component. The relative weight of these components is constrained based on prior material assumptions. Excellent results are obtained for simulations and for phantom measurements. Beam-hardening artifacts are effectively eliminated. The relation with existing algorithms is discussed. The results confirm that improving the acquisition model assumed by the reconstruction algorithm results in reduced artifacts. Preliminary results indicate that metal artifact reduction is a very promising application for this new algorithm.

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Documento generato il 23/01/20 alle ore 03:49:55