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Titolo:
INVESTIGATION OF LSO CRYSTALS FOR HIGH-SPATIAL-RESOLUTION POSITRON EMISSION TOMOGRAPHY
Autore:
CASEY ME; ERIKSSON L; SCHMAND M; ANDREACO MS; PAULUS M; DAHLBOM M; NUTT R;
Indirizzi:
CTI PET SYST KNOXVILLE TN 00000 KAROLINSKA INST STOCKHOLM SWEDEN MAX PLANCK INST COLOGNE GERMANY OAK RIDGE NATL LAB OAK RIDGE TN 00000 UNIV CALIF LOS ANGELES LOS ANGELES CA 00000
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 3, volume: 44, anno: 1997,
parte:, 2
pagine: 1109 - 1113
SICI:
0018-9499(1997)44:3<1109:IOLCFH>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
PET DETECTOR MODULE; PIN PHOTODIODE; DEPTH; DESIGN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
M.E. Casey et al., "INVESTIGATION OF LSO CRYSTALS FOR HIGH-SPATIAL-RESOLUTION POSITRON EMISSION TOMOGRAPHY", IEEE transactions on nuclear science, 44(3), 1997, pp. 1109-1113

Abstract

In order to achieve high sensitivity and maintain good uniform spatial resolution over the field of view in high resolution PET systems, adequate depth of interaction information must be extracted from the crystal. A phoswich detector can supply one solution to the depth of interaction problem. In this approach,two or more scintillators exhibitingdifferent light decay times are positioned on top of each other and separated by pulse shape discrimination. Initially, our experiments focused on separating different types of scintillators such as LSO and GSO or LSO and YSO. These combinations were all well separated as expected. During the investigation, a shift in the time distribution of different samples of LSO was noticed. Further investigation showed two groups of LSO. The shift in the zero cross time was more than twice the FWHM of the time distribution. A single photon experiment revealed thatthe decay time of the 'fast' crystal was 33.4 nanoseconds while the decay of the 'slow' crystal was 42.2 nanoseconds. A spectral plot revealed that the spectral output of the 'slow' crystal was skewed to the longer wavelengths as compared to the 'fast' crystal. Further investigation on other crystal samples revealed decay times between the two extremes, suggesting a continuum in the light decay.

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Documento generato il 01/04/20 alle ore 21:00:40