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Titolo:
Iterative crystal efficiency calculation in fully 3-D PET
Autore:
Ferreira, NC; Trebossen, R; Comtat, C; Gregoire, MC; Bendriem, B;
Indirizzi:
Serv Hosp Frederic Joliot, F-91406 Orsay, France Serv Hosp Frederic Joliot Orsay France F-91406 ot, F-91406 Orsay, France Univ Coimbra, Fac Med, Serv Biofis, P-3000 Coimbra, Portugal Univ CoimbraCoimbra Portugal P-3000 rv Biofis, P-3000 Coimbra, Portugal CTI PET Syst Inc, Knoxville, TN 37932 USA CTI PET Syst Inc Knoxville TN USA 37932 Syst Inc, Knoxville, TN 37932 USA
Titolo Testata:
IEEE TRANSACTIONS ON MEDICAL IMAGING
fascicolo: 5, volume: 19, anno: 2000,
pagine: 485 - 492
SICI:
0278-0062(200005)19:5<485:ICECIF>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
3D PET; DETECTOR EFFICIENCY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Engineering, Computing & Technology
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Ferreira, NC Serv Hosp Frederic Joliot, F-91406 Orsay, France Serv Hosp Frederic Joliot Orsay France F-91406 rsay, France
Citazione:
N.C. Ferreira et al., "Iterative crystal efficiency calculation in fully 3-D PET", IEEE MED IM, 19(5), 2000, pp. 485-492

Abstract

The calculation of the intrinsic efficiency of individual crystals is one of the steps needed to obtain accurate images of the radioisotope distribution in positron emission tomography (PET), These efficiencies can be computed by comparing the number of coincidence counts obtained when the crystalsare equally illuminated by the same source. However, because the number ofcoincidence counts acquired for one crystal also depends on the efficiencyof the other crystals in coincidence, most methods of crystal efficiency calculation need to assume that the influence of the other crystals is negligible. If there are large crystal efficiency variations, this approximationmay lead to systematic errors. We have recently implemented an iterative method for a single ring of detectors that does not rely on this assumption. In this paper, we describe a fully three-dimensional (3-D) iterative method that better exploits the sensitivity of the tomograph and allows reduced acquisition times or the use of narrow energy windows. We compare the performance of the iterative method (single-ring and extended to fully 3-D) withnoniterative techniques for different acquisition times of a uniform cylinder. Two different energy windows were used to assess the performance of each method with different levels of variations of crystal efficiency. The results showed that the iterative methods are more accurate when large efficiency variations exist and that only the fully 3-D methods provided good efficiency estimates with very low duration scans, We, thus, conclude that iterative fully 3-D methods provide the best estimations and can be used in a larger range of situations than can the other methods tested.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 20:46:24