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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:10138513
;  [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:
USDOE, Washington, DC (United States); Department of Health and Human Services, Washington, DC (United States)
DOE Contract Number:
AC03-76SF00098
OSTI ID:
10138513
Report Number(s):
LBL--33042; CONF-921005--27; ON: DE93007715; CNN: Grant P01-HL25840; Grant R01-CA48002; Grant R01-NS29655
Country of Publication:
United States
Language:
English

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Related Subjects

440103
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550602
62 RADIOLOGY AND NUCLEAR MEDICINE
BGO DETECTORS
BISMUTH GERMANATES
COMPUTERIZED SIMULATION
CRYSTALS
EXTERNAL RADIATION IN DIAGNOSTICS
FUNCTIONAL MODELS
MONTE CARLO METHOD
NUCLEAR SPECTROSCOPIC INSTRUMENTATION
PERFORMANCE
PHOTODIODES
PHOTOMULTIPLIERS
POSITRON COMPUTED TOMOGRAPHY
SILICON