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Titolo:
Influence of malfunctioning block detectors on the calculation of single detector efficiencies in PET
Autore:
Ferreira, NC; Trebossen, R; Gregoire, MC; Bendriem, B;
Indirizzi:
CEA, Serv Hosp Frederic Joliot, F-91406 Orsay, France CEA Orsay France F-91406 erv Hosp Frederic Joliot, 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 NUCLEAR SCIENCE
fascicolo: 4, volume: 46, anno: 1999,
parte:, 2
pagine: 1062 - 1069
SICI:
0018-9499(199908)46:4<1062:IOMBDO>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
3D PET; NORMALIZATION; CALIBRATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Ferreira, NC CEA, Serv Hosp Frederic Joliot, 4 Pl Gen Leclerc, F-91406 Orsay, France CEA 4 Pl Gen Leclerc Orsay France F-91406 1406 Orsay, France
Citazione:
N.C. Ferreira et al., "Influence of malfunctioning block detectors on the calculation of single detector efficiencies in PET", IEEE NUCL S, 46(4), 1999, pp. 1062-1069

Abstract

In this work, we studied the artifacts generated by the application of methods of crystal efficiency calculation based on the fan-sum, to situations of high variability of efficiency, namely the cases of a ring with defective blocks and acquisitions using narrow energy windows. We propose two efficiency calculation methods to reduce these artifacts: one method discriminates the crystals with an efficiency very different from the average, and then uses a modification of the fan-sum to estimate the efficiency; the other method calculates iteratively the fan-sum of each crystal, weighted by the efficiencies of the opposed detectors. The effect of using an off-center uniform cylinder is also discussed, since it influences the performance of the algorithms. The proposed algorithms are compared with the more conventional fan-sum method and with an algorithm used in a commercial tomograph, using measurements and simulations. The results show a significant reduction of the efficiency estimation errors, in severe situations where detectors in a ring have very different detection efficiency.

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Documento generato il 03/07/20 alle ore 15:32:40