Positioning and energy response of PET block detectors with different light sharing schemes

Conference · Mon Aug 01 04:00:00 EDT 1994 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6838586

Tornai, M P; Hoffman, E J ^[1]; Germano, G ^[2]

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1. Univ. of California, Los Angeles, CA (United States). Dept. of Pharmacology
2. Cedars-Sinai Medical Center, Los Angeles, CA (United States)

Two state-of-the-art modular PET block detectors using either discrete or pseudo-discrete BGO crystals coupled to two dual PMTs, utilizing different light sharing schemes, were evaluated. Both detectors were approximately 30 mm thick, which each element of the GE 6 x 6 block detector was 4 mm x 8.4 mm, and each element of the CTI 8 x 7 block detector was 2.8 mm x 5.8 mm. In addition to measurements with gamma sources, the detectors were also irradiated with a Sr/Y-90 beta source to evaluate the performance of the block detectors without inter-element scatter of annihilation photons. The best and worst energy resolutions of individual elements at 511 keV were 21.8% and 44.2% for the GE detector, and 22.7% and 42.5% for the CTI detector. The peak to valley ratios in the detector identification ratio histograms were generally better than 3 to 1. Measurements with beta sources indicate that light sharing in both detectors is a large component of even mispositioning along with inter-detector scatter of the annihilation photons.

• DOE Contract Number: FC03-87ER60615
• OSTI ID: 6838586
• Report Number(s): CONF-931051--
• Conference Information: Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 41:4PT1
• Country of Publication: United States
• Language: English

Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
BGO DETECTORS
CAMERAS
COMPARATIVE EVALUATIONS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
EVALUATION
GAMMA CAMERAS
MEASURING INSTRUMENTS
OPTIMIZATION
PERFORMANCE TESTING
POSITRON CAMERAS
POSITRON COMPUTED TOMOGRAPHY
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
SPATIAL RESOLUTION
TESTING
TOMOGRAPHY