An experimental and theoretical comparison of BGO and BaF as detector materials for high resolution PET

Conference · Wed May 01 04:00:00 EDT 1985 · J. Nucl. Med.; (United States)

OSTI ID:5873032

Dahlbom, M; Hoffman, E J; Ricci, A R

In this paper physical properties of BaF/sub 2/ and BGO were studied both experimentally and theoretically with Monte Carlo calculations to help better understand the magnitude of errors in data mispositioning due to scatter between narrow crystals in high resolution PET systems and to evaluate the strategy of minimizing crosstalk with inter-detector absorbers. Properties that were studied are; coincidence detection efficiency as a function of energy threshold, amount of crosstalk due to interdetector scatter, and resolution uniformity across the FOV of a PET system. For a 100 cm diameter PET system, detector resolution for BGO varied from 4.6mm to 5.8mm from center out to a 15cm radius, while BaF/sub 2/ varied from 4.6mm to 7.4mm under same conditions. This loss in resolution for BaF/sub 2/ for a system without interdetector shielding and the loss of additional efficiency with interdetector shielding make BGO the choice for high resolution systems. For a nontime-of-flight system, the minimum resolving time to avoid data loss for a whole body PET system is about 5 nsec, while BGO systems are capable of 10 to 20 nsec resolving times. Since the accidentals rate increases by the square of singles count rate and BaF/sub 2/ systems require higher doses to obtain same number of counts, the benefit of faster detectors can easily be lost due to the higher singles rate per coincident event of the BaF/sub 2/ system.

• Research Organization: UCLA School of Medicine, Los Angeles, CA
• OSTI ID: 5873032
• Report Number(s): CONF-850611-
• Conference Information: Journal Name: J. Nucl. Med.; (United States) Journal Volume: 26:5
• 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
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM FLUORIDES
BGO DETECTORS
CAMERAS
COINCIDENCE METHODS
COMPUTERIZED TOMOGRAPHY
COUNTING RATES
COUNTING TECHNIQUES
DESIGN
DIAGNOSTIC TECHNIQUES
EFFICIENCY
EMISSION COMPUTED TOMOGRAPHY
FLUORIDES
FLUORINE COMPOUNDS
GAMMA CAMERAS
HALIDES
HALOGEN COMPOUNDS
MEASURING INSTRUMENTS
PERFORMANCE
PERFORMANCE TESTING
POSITRON COMPUTED TOMOGRAPHY
QUANTUM EFFICIENCY
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
TESTING
TOMOGRAPHY