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Title: Advantages using pulse shape discrimination to assign the depth of interaction information (DOI) from a multi layer phoswich detector

Abstract

Recently new high resolution brain PET and PET/SPECT tomographs have been discussed using phoswich detectors. The detector design is based on two layers of scintillation crystals in the z-axis with different physical properties, such as light decay time or light yield. This makes it feasible to assign the depth of interaction (DOI) information in order to be able to correct for spatial degradation in PET or to operate the detector in PET or SPECT mode. The pixel DOI detectors are cost effectively arranged in a block design. In this work the authors discuss the possibility of separating events from the two different layers in the time domain using pulse shape discrimination or in the energy domain using pulse height discrimination. Furthermore, they have investigated the feasibility of interdetector scatter suppression using pulse shape discrimination. The measurements have been done using a LSO/LSO high resolution PET detector, a LSO and GSO crystal in coincidence and a NaI(Tl)/LSO combined PET/SPECT detector. The investigations show that the pulse shape discrimination technique has a significant higher identification probability compared to the pulse height discrimination and does make a interdetector scatter detection feasible.

Authors:
 [1];  [2];  [1];  [3];  [4];  [2]
  1. CTI PET Systems, Inc., Knoxville, TN (United States)
  2. CTI, Inc., Knoxville, TN (United States)
  3. Max-Planck-Inst. for Neurology Research, Cologne (Germany)
  4. RWTH-Aachen (Germany)
Publication Date:
OSTI Identifier:
687366
Report Number(s):
CONF-981110-
Journal ID: IETNAE; ISSN 0018-9499; TRN: 99:010342
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Nuclear Science
Additional Journal Information:
Journal Volume: 46; Journal Issue: 4Pt2; Conference: 1998 IEEE nuclear science symposium and medical imaging conference, Toronto (Canada), 10-12 Nov 1998; Other Information: PBD: Aug 1999
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 55 BIOLOGY AND MEDICINE, BASIC STUDIES; POSITRON COMPUTED TOMOGRAPHY; IMAGE PROCESSING; SPATIAL RESOLUTION; SOLID SCINTILLATION DETECTORS; DESIGN; SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY

Citation Formats

Schmand, M, Max-Planck-Inst. for Neurology Research, Cologne, RWTH-Aachen, Eriksson, L, Karolinska Inst., Casey, M E, Wienhard, K, Fluegge, G, and Nutt, R. Advantages using pulse shape discrimination to assign the depth of interaction information (DOI) from a multi layer phoswich detector. United States: N. p., 1999. Web. doi:10.1109/23.790808.
Schmand, M, Max-Planck-Inst. for Neurology Research, Cologne, RWTH-Aachen, Eriksson, L, Karolinska Inst., Casey, M E, Wienhard, K, Fluegge, G, & Nutt, R. Advantages using pulse shape discrimination to assign the depth of interaction information (DOI) from a multi layer phoswich detector. United States. doi:10.1109/23.790808.
Schmand, M, Max-Planck-Inst. for Neurology Research, Cologne, RWTH-Aachen, Eriksson, L, Karolinska Inst., Casey, M E, Wienhard, K, Fluegge, G, and Nutt, R. Sun . "Advantages using pulse shape discrimination to assign the depth of interaction information (DOI) from a multi layer phoswich detector". United States. doi:10.1109/23.790808.
@article{osti_687366,
title = {Advantages using pulse shape discrimination to assign the depth of interaction information (DOI) from a multi layer phoswich detector},
author = {Schmand, M and Max-Planck-Inst. for Neurology Research, Cologne and RWTH-Aachen and Eriksson, L and Karolinska Inst. and Casey, M E and Wienhard, K and Fluegge, G and Nutt, R},
abstractNote = {Recently new high resolution brain PET and PET/SPECT tomographs have been discussed using phoswich detectors. The detector design is based on two layers of scintillation crystals in the z-axis with different physical properties, such as light decay time or light yield. This makes it feasible to assign the depth of interaction (DOI) information in order to be able to correct for spatial degradation in PET or to operate the detector in PET or SPECT mode. The pixel DOI detectors are cost effectively arranged in a block design. In this work the authors discuss the possibility of separating events from the two different layers in the time domain using pulse shape discrimination or in the energy domain using pulse height discrimination. Furthermore, they have investigated the feasibility of interdetector scatter suppression using pulse shape discrimination. The measurements have been done using a LSO/LSO high resolution PET detector, a LSO and GSO crystal in coincidence and a NaI(Tl)/LSO combined PET/SPECT detector. The investigations show that the pulse shape discrimination technique has a significant higher identification probability compared to the pulse height discrimination and does make a interdetector scatter detection feasible.},
doi = {10.1109/23.790808},
journal = {IEEE Transactions on Nuclear Science},
number = 4Pt2,
volume = 46,
place = {United States},
year = {1999},
month = {8}
}