A positron tomograph with 600 BGO (bismuth germanate) crystals and 2. 6 mm resolution

Conference · Thu Oct 01 04:00:00 EDT 1987

OSTI ID:5173329

Derenzo, S E; Huesman, R H; Cahoon, J L; Geyer, A B; Moses, W W; Uber, D C; Vuletich, T; Budinger, T F

We describe the imaging performance of the Donner 600-Crystal Positron Tomograph, a single 600 cm diam ring of 3 mm wide bismuth germanate (BGO) crystals coupled individually to 14 mm phototubes. With a pulse height threshold of 200 keV and a slice thickness of 5 mm, the sensitivity is 7024 eventssec per ..mu..Ciml in a 20 cm cyliner of water. The measured rates for 18 ..mu..Ciml are 95,000 truessec plus 20,000 randomsec. A 0.3 mm diam /sup 22/Na line source near the center of the tomograph has a circular point spread function (PSF) with a full-width at half-maximum (fwhm) of 2.6 mm. At 5 cm from the center the PSF is elliptical with a fwhm of 2.7 mm tangential )times) 3.2 mm radial. At 10 cm the PSF has a fwhm of 2.8 mm tangential )times) 4.8 mm radial. Attenuation data are accumulated with a 20 mCi /sup 68/Ge orbiting transmission source and 100 million coincident events are collected in 200 sec. 20 refs., 9 figs., 5 tabs

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5173329
• Report Number(s): LBL-24315; CONF-871006-48; ON: DE88007375
• Country of Publication: United States
• Language: English

Related Subjects

440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
BGO DETECTORS
BISMUTH COMPOUNDS
BISMUTH GERMANATES
BLOOD FLOW
BODY
BRAIN
CENTRAL NERVOUS SYSTEM
COMPUTERIZED TOMOGRAPHY
DATA ACQUISITION SYSTEMS
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
GERMANATES
GERMANIUM COMPOUNDS
MEASURING INSTRUMENTS
NERVOUS SYSTEM
ORGANS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PHOTOTUBES
POSITRON COMPUTED TOMOGRAPHY
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
SPATIAL RESOLUTION
TESTING
TOMOGRAPHY