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Performance of a PET detector module utilizing an array of silicon photodiodes to identify the crystal of interaction

Conference ·
OSTI ID:6879193
;  [1]; ; ; ;  [2]
  1. Lawrence Berkeley Lab., CA (United States)
  2. CTI, Inc., Knoxville, TN (United States)
+ Show Author Affiliations
We present initial performance results for a new multi-layer PET detector module consisting of an array of 3 mm square by 30 mm deep BGO crystals coupled on one end to a single photomultiplier tube and on the opposite end to an array of 3 mm square silicon photodiodes. The photomultiplier tube provides an accurate timing pulse and energy discrimination for the all the crystals in the module, while the silicon photodiodes identify the crystal of interaction. When a single BGO crystal at +25[degree]C is excited with 511 key photons, we measure a photodiode signal centered at 700 electrons (e[sup [minus]]) with noise of 375 e[sup [minus]] fwhm. When a four crystal / photodiode module is excited with a collimated line source of 511 key photons, the crystal of interaction is correctly identified 82% of the time. The misidentification rate can be greatly reduced and an 8[times]8 crystal / photodiode module constructed by using thicker depletion layer photodiodes or cooling to 0[degrees]C.
Research Organization:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Organization:
DOE; DOHHS; USDOE, Washington, DC (United States); Department of Health and Human Services, Washington, DC (United States)
DOE Contract Number:
AC03-76SF00098
OSTI ID:
6879193
Report Number(s):
LBL-33042; CONF-921005--27; ON: DE93007715; CNN: P01-HL25840; R01-CA48002; R01-NS29655
Country of Publication:
United States
Language:
English

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Related Subjects

440103 -- Radiation Instrumentation-- Nuclear Spectroscopic Instrumentation
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
BGO DETECTORS
BISMUTH COMPOUNDS
BISMUTH GERMANATES
CALCULATION METHODS
COMPUTERIZED SIMULATION
COMPUTERIZED TOMOGRAPHY
CRYSTALS
DIAGNOSTIC TECHNIQUES
ELEMENTS
EMISSION COMPUTED TOMOGRAPHY
FUNCTIONAL MODELS
GERMANATES
GERMANIUM COMPOUNDS
MEASURING INSTRUMENTS
MONTE CARLO METHOD
OXYGEN COMPOUNDS
PERFORMANCE
PHOTODIODES
PHOTOMULTIPLIERS
PHOTOTUBES
POSITRON COMPUTED TOMOGRAPHY
RADIATION DETECTORS
SCINTILLATION COUNTERS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMIMETALS
SILICON
SIMULATION
SOLID SCINTILLATION DETECTORS
TOMOGRAPHY