A high resolution detection system for positron tomography

Journal Article · Tue Feb 01 00:00:00 EST 1983 · IEEE Trans. Nucl. Sci.; (United States)

DOI:https://doi.org/10.1109/TNS.1983.4332352· OSTI ID:6155680

Barton, J B; Dabrowski, A J; Hoffman, E J; Iwanczyk, J S; Kusmiss, J H

The feasibility of using a hybrid detection system, consisting of multiple narrow bismuth germanate (BGO) crystals coupled to one photomultiplier for coincidence timing, and individual mercuric iodide (HgI2) photodetectors coupled to each BGO crystal to identify crystals of interaction, was investigated for application to positron tomography. The match between the emission spectrum of BGO and the photoresponse spectrum of HgI2 in combination with recently developed HgI2 x-ray detector and low noise preamplifier technology provided the appropriate high sensitivity, low noise environment required to detect the low levels of scintillation light produced in the absorption of 511 keV gamma-rays in BGO. Energy resolution of 24% for 511 keV was obtained with the BGO-HgI2 detector, compared to 18% for BGO with a PMT. Coincidence resolving time for the HgI2-BGO detector was measured to be 105 nanoseconds. This performance of a non-optimized detector system is nominally adequate for appropriately designed tomographs.

• Research Organization: Divisions of Biophysics and Nuclear Medicine, Dept. of Radiological Sciences, School of Medicine and Lab. of Nuclear Medicine, Univ. of CA Los Angeles
• DOE Contract Number: AC03-76SF00012
• OSTI ID: 6155680
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. 30:1
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
62 RADIOLOGY AND NUCLEAR MEDICINE
POSITRON COMPUTED TOMOGRAPHY
POSITRON DETECTION
BISMUTH COMPOUNDS
COINCIDENCE METHODS
CRYSTALS
FEASIBILITY STUDIES
GAMMA RADIATION
GERMANIUM OXIDES
MERCURY IODIDES
PERFORMANCE
PHOTODETECTORS
PHOTOMULTIPLIERS
PHOTOSENSITIVITY
PREAMPLIFIERS
SCINTILLATIONS
SENSITIVITY
AMPLIFIERS
CHALCOGENIDES
CHARGED PARTICLE DETECTION
COMPUTERIZED TOMOGRAPHY
COUNTING TECHNIQUES
DETECTION
DIAGNOSTIC TECHNIQUES
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION COMPUTED TOMOGRAPHY
EQUIPMENT
GERMANIUM COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IODIDES
IODINE COMPOUNDS
IONIZING RADIATIONS
MERCURY COMPOUNDS
MERCURY HALIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOTUBES
RADIATION DETECTION
RADIATIONS
TOMOGRAPHY
440100* - Radiation Instrumentation
550600 - Medicine