DocumentCode :
1459369
Title :
Segmented LSO crystals for depth-of-interaction encoding in PET
Author :
Moisan, C. ; Andreaco, M.S. ; Rogers, J.G. ; Paquet, S. ; Vozza, D.
Author_Institution :
TRIUMF, Vancouver, BC, Canada
Volume :
45
Issue :
6
fYear :
1998
fDate :
12/1/1998 12:00:00 AM
Firstpage :
3030
Lastpage :
3035
Abstract :
The authors have developed a method of effecting depth-of-interaction sensitivity for PET detectors. It exploits a significant difference in the index of refraction between adjacent scintillator segments and the compound optically coupling them, to induce discrete and resolved photopeak pulse heights depending on the segment of interaction of γ-rays. The approach was put to a first experimental test by manufacturing two prototypes with LSO crystals of dimensions 4×4×30 mm and 2.5×2.5×20 mm respectively, each comprising three segments along their longitudinal axis. Measurements of their absolute pulse height responses when irradiated by 511 keV photons are presented and show resolved peaks for photoelectric interactions occurring in each longitudinal segment as desired. For the second of the above prototypes, the lowest(highest) of these peaks is measured to correspond to a pulse height of 335(559) photoelectrons with full-width-at-half-maximum resolution of 28%(12%). The expected performances of PET detector units comprising a plurality of such segmented crystals is also discussed
Keywords :
biomedical equipment; image coding; positron emission tomography; solid scintillation detectors; 511 keV; PET; absolute pulse height responses; depth-of-interaction encoding; full-width-at-half-maximum resolution; longitudinal axis; medical diagnostic imaging; medical instrumentation; nuclear medicine; photoelectric interactions; photoelectrons; refractive index differences; resolved peaks; segmented LSO crystals; Crystals; Detectors; Encoding; Optical coupling; Optical pulses; Optical refraction; Optical sensors; Positron emission tomography; Prototypes; Pulse measurements;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/23.737660
Filename :
737660
Link To Document :
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