G.-C. Wang

General Electric (United States)

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K.S. Shah

École de Technologie Supérieure

Jonathan S. Maltz

Lawrence Berkeley National Laboratory

J.W. LeBlanc

University of Michigan–Ann Arbor

M. McClish

Radiation Monitoring Devices (United States)

Jürgen Huber

Universität Innsbruck

R. Farrell

University of Saskatchewan

Woon-Seng Choong

Lawrence Berkeley National Laboratory

Kent Burr

Canon (United States)

W.W. Moses

Associates Research

Adrián Iván

Institute for Nuclear Research Pitesti

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Lawrence Berkeley National Laboratory

General Electric (United States)

University of California, Berkeley

Radiation Monitoring Devices (United States)

GE Global Research (United States)

Motion Control (United States)

École de Technologie Supérieure

King Edward Memorial Hospital and Seth G.S. Medical College

Brookhaven National Laboratory

Oak Ridge National Laboratory

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Calibration of a PEM detector with depth of interaction measurement - eScholarship

G.-C. Wang Jürgen Huber W.W. Moses Woon-Seng Choong Jonathan S. Maltz

We present an in situ calibration technique for the LBNL positron emission mammography (PEM) detector module that is capable of measuring depth of interaction (DOI). The detector module consists of 64 LSO crystals coupled on one end to a single photomultiplier tube (PMT) and on the opposite end to a 64 pixel array of silicon photodiodes (PD). The PMT provides an accurate timing pulse, the PDs identify the crystal of interaction, the sum provides a total energy signal and the /spl Gamma/=PD/(PD+PMT) ratio determines the depth of interaction. We calibrate using the /sup 176/Lu natural background radiation of the LSO crystals. We determine the relative gain (K) of the PMT and PD by minimizing the asymmetry of the /spl Gamma/ distribution. We determine the depth dependence from the width of the /spl Gamma/ distribution with optimal K. The performance of calibrated detector modules is evaluated by averaging results from 12 modules. The energy resolution is a function of depth ranging from 24 percent FWHM at the PD end to 51 percent FWHM at the PMT end, and the DOI resolution ranges from 6 mm FWHM at the PD end to 11 mm FWHM at the PMT end.

Silicon Photomultiplier

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Design of a High-Resolution PET Detector Using Avalanche Photodiodes

IEEE Nuclear Science Symposium conference record (2006)

Kent Burr Adrián Iván G.-C. Wang J.W. LeBlanc M. McClish

We describe new high-resolution depth-of-interaction (DOI) PET detector designs based on avalanche photodiodes (APDs). With the development of APDs which utilize thin drift regions to speed response time, these detectors promise improved timing performance relative to previously reported APD-based DOI detectors. The new designs also offer improved decoding of smaller crystals at room temperature through the use of a combination of position-sensitive APDs and pixellated APDs. The number of read-out channels for these designs is kept much smaller than the number of scintillator crystals by ganging together APD outputs in an encoding pattern which still allows for the correct identification of the crystal-of-interaction

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10.1109/nssmic.2005.1596915

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