Design studies for a PET detector module using a PIN photodiode to measure depth of interaction

Conference · Mon Aug 01 04:00:00 EDT 1994 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:6810831

Moses, W W; Derenzo, S E ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

The authors present design studies of a multi-layer PET detector module that uses an 8x8 array of 3 mm square PIN photodiodes to both identify the crystal of interaction and measure the depth of interaction. Each photodiodes coupled to one end of a 3x3x30 mm BGO crystal, with the opposite ends of 64 such crystals attached to a single 1 inch square photomultiplier tube that provides a timing signal and energy discrimination. Each BGO crystal is coated with a lossy reflector, so the ratio of light detected in the photodiode and photomultiplier tube depends on the interaction depth in the crystal, and is used to determine this depth of interaction on an event by event basis. A test module with one 3x3x30 mm BGO crystal, one 3 mm square PIN photodiode, and one photomultiplier tube is operated at [minus]20 C with an amplifier peaking time of 4 [mu]s, and a depth of interaction resolution of 5 to 8 mm fwhm measured. Simulations predict that this virtually eliminates radial elongation in a 60 cm diameter BGO tomograph. The photodiode signal corresponding to 511 keV energy deposit varies linearly with excitation position, ranging from 1,250 electrons (e[sup [minus]]) at the end closest to the photodiode to 520 e[sup [minus]] at the opposite end. The electronic noise is a position independent 330 e[sup [minus]] fwhm, so the signal to noise ratio is sufficient to reliably identify the crystal of interaction in a 64 element module.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6810831
• Report Number(s): CONF-931051--
• Conference Information: Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Journal Volume: 41:4Pt1
• Country of Publication: United States
• Language: English

Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
BGO DETECTORS
CAMERAS
COMPUTERIZED SIMULATION
COMPUTERIZED TOMOGRAPHY
DESIGN
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
GAMMA CAMERAS
MEASURING INSTRUMENTS
PERFORMANCE
POSITRON CAMERAS
POSITRON COMPUTED TOMOGRAPHY
RADIATION DETECTORS
RESOLUTION
SCINTILLATION COUNTERS
SCINTILLATOR-PHOTODIODE DETECTORS
SIMULATION
SOLID SCINTILLATION DETECTORS
SPATIAL RESOLUTION
TOMOGRAPHY