Monte Carlo optimization of depth-of-interaction resolution in PET crystals

Conference · Fri Nov 01 00:00:00 EST 1991

OSTI ID:5453013

DeVol, T A ^[1]; Moses, W W; Derenzo, S E ^[2]

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1. Michigan Univ., Ann Arbor, MI (United States). Dept. of Nuclear Engineering
2. Lawrence Berkeley Lab., CA (United States)

The light distribution along one edge of a PET scintillation crystal was investigated with a Monte Carlo simulation. This position-dependent light can be used to measure the 511 keV photon interaction position in the crystal on an event by event basis, thus reducing radial elongation. The expected full width at half maximum (FWHM) of the light distribution on the 3 {times} 30 mm{sup 2} surface of a 3 {times} 10 {times} 30 mm{sup 3} bismuth germanate (BGO) crystal surrounded by a diffuse reflector was determined to be 3.0 mm. This light distribution does not change as the width (originally 3 mm) is varied from 1 to 6 mm, but decreases monotonically from 3.0 to 1.8 mm FWHM as the height (originally 10 mm) is reduced to 3 mm. Other geometrical modifications were simulated, including numerous corner reflectors on the opposing 3 {times} 30 mm{sup 2} surface, which reduced the FWHM to 2.4 mm. The response of a dual wedge photodiode combined with the predicted light distribution for the 3 {times} 10 {times} 30 mm{sup 3} BGO simulation crystal results in an expected depth of interaction resolution of 7.5 mm FWHM.

• Research Organization: Lawrence Berkeley Lab., CA (United States)
• Sponsoring Organization: USDOE; DOHHS; ORAU; NCI; USDOE, Washington, DC (United States); Department of Health and Human Services, Washington, DC (United States); Oak Ridge Associated Universities, Inc., TN (United States); National Cancer Inst., Bethesda, MD (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5453013
• Report Number(s): LBL-31457; CONF-911106-92; ON: DE92011147; CNN: P01-HL25840; R01-CA48002
• Resource Relation: Conference: IEEE nuclear science symposium, Santa Fe, NM (United States), 5-9 Nov 1991
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
POSITRON COMPUTED TOMOGRAPHY
OPTIMIZATION
CRYSTALS
MONTE CARLO METHOD
PHOTODIODES
POSITRON CAMERAS
SPATIAL DISTRIBUTION
CAMERAS
COMPUTERIZED TOMOGRAPHY
DIAGNOSTIC TECHNIQUES
DISTRIBUTION
EMISSION COMPUTED TOMOGRAPHY
GAMMA CAMERAS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
TOMOGRAPHY
550601* - Medicine- Unsealed Radionuclides in Diagnostics