Initial results from the Donner 600 crystal positron tomograph

Conference · Sun Feb 01 04:00:00 EST 1987 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:6705983

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

The authors describe a positron tomography using a single ring of 600 close-packed 3 mm wide bismuth germanate (BGO) crystals coupled to 14 mm phototubes. The phototube preamplifier circuit derives a timing pulse from the first photoelectron, and sends it to address and coincidence circuits only if the integrated pulse height is within a pre-set window. The timing delays and pulse height windows for all 600 detectors and the coincidence timing windows are computer adjustable. An orbiting positron source is used for transmission measurements and look-up table is used to reject scattered and random coincidences that do not pass through the source. Data can be acquired using a stationary mode for 1.57 mm lateral sampling or the two-position clam sampling mode for 0.79 mm lateral sampling. High maximum data rates are provided by 45 parallel coincidence circuits and 4 parallel histogram memory units. With two-position sampling and 1.57 mm bins, the reconstructed point spread function (PSF) of a 0.35 mm diam /sup 22/Na wire source at the center of the tomograph is circular with 2.9 mm full-width at half-maximum (fwhm) and the PSF at a distance of 8 cm from the center is elliptical with a radial fwhm of 4.0 mm and tangential fwhm of 3.0 mm.

• Research Organization: Donner Lab. and Lawrence Berkeley Lab., Univ. of California, Berkeley, CA 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6705983
• Report Number(s): CONF-861007-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: NS-34:1
• Country of Publication: United States
• Language: English

Related Subjects

440101 -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
ALKALI METAL ISOTOPES
AMPLIFIERS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BGO DETECTORS
COINCIDENCE CIRCUITS
COMPUTERIZED CONTROL SYSTEMS
COMPUTERIZED TOMOGRAPHY
CONTROL SYSTEMS
COUNTING TECHNIQUES
CRYSTALS
DIAGNOSTIC TECHNIQUES
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EMISSION COMPUTED TOMOGRAPHY
EQUIPMENT
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MEMORY DEVICES
NUCLEI
ODD-ODD NUCLEI
PARTICLE SOURCES
PHOTOELECTRON COUNTING
PHOTOTUBES
POSITRON COMPUTED TOMOGRAPHY
POSITRON SOURCES
PREAMPLIFIERS
PULSE TECHNIQUES
RADIATION DETECTORS
RADIATION SOURCES
RADIOISOTOPES
SAMPLING
SCINTILLATION COUNTERS
SODIUM 22
SODIUM ISOTOPES
SOLID SCINTILLATION DETECTORS
TIMING CIRCUITS
TOMOGRAPHY
YEARS LIVING RADIOISOTOPES