Evaluation of cerium activated gadolinium orthosilicate (GSO) as a detector for PET
The properties which were evaluated were: 1) scintillation light yield relative to BGO with photomultipliers and mercuric iodide photodetectors, 2) coincidence resolving time, which was compared to BGO and CsF and theoretical predictions, 3) crosstalk due to intercrystal scatter, 4) detector sensitivity relative to BGO, and 5) spatial resolution. The light yield was found to be 1.7 times that of BGO with energy resolution improvement consistent with improved photon statistics (17.8 to 13.8% FWHM). Resolution with GSO coupled to mercuric iodide photodetector was 13.6% FWHM. The coincidence timing (2.3 nsec FWHM and 4.6 nsec FWTM) was a factor of 2 to 3 poorer than the theoretical expectation. Crosstalk had a minimal effect on spatial resolution (3.5-3.7 mm for 5mm wide crystal) compared to BGO. The efficiency of a pair of 45 mm deep GSO coincident detectors is estimated to be 90% of a pair of 30 mm deep BGO detectors. Evaluation of Derenzo's quality factor for BGO versus GSO gave values within 20% of each other over a range of activity densities of 100 to 1000 microcuries/cm. GSO was found to be comparable to BGO as a PET detector. GSO is a high density (6.71 gm/cc), high effective Z (59) scintillation detector with a faster decay time (60 nsec) and higher light yield (1.3-1.7) than BGO, and because of these properties, we evaluated GSO as a potential detector for use in positron tomography systems.
- Research Organization:
- UCLA School of Medicine, Los Angeles, CA
- OSTI ID:
- 6843535
- Report Number(s):
- CONF-840619-
- Journal Information:
- J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 25:5; ISSN JNMEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BGO DETECTORS
CERIUM
COINCIDENCE METHODS
COMPUTERIZED TOMOGRAPHY
COUNTING TECHNIQUES
DECAY
DIAGNOSTIC TECHNIQUES
ELEMENTARY PARTICLES
ELEMENTS
EMISSION COMPUTED TOMOGRAPHY
ENERGY RESOLUTION
GADOLINIUM COMPOUNDS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
METALS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHOTODETECTORS
PHOTOMULTIPLIERS
PHOTONS
PHOTOTUBES
POSITRON COMPUTED TOMOGRAPHY
RADIATION DETECTORS
RARE EARTH COMPOUNDS
RARE EARTHS
RESOLUTION
SCINTILLATION COUNTERS
SILICATES
SILICON COMPOUNDS
SOLID SCINTILLATION DETECTORS
SPATIAL RESOLUTION
TESTING
TIME RESOLUTION
TIMING PROPERTIES
TOMOGRAPHY