NDLI: Depth of interaction for PET using segmented crystals

Content Provider	IEEE Xplore Digital Library
Author	MacDonald, L.R. Dahlbom, M.
Copyright Year	1963
Abstract	The authors investigate the use of segmented scintillation crystals to obtain depth of interaction (DOI) information in positron emission tomography (PET) detectors. Coupling segmented crystals to a photodetector at one end yields distinct pulse heights from the different segments and the depth of interaction is determined to within the segment length. The method is simple to implement because no additional instrumentation is required. Since the technique uses light attenuation, a scintillator with sufficient light yield is required. The authors found that 4/spl times/4/spl times/10 mm/sup 3/ segments of lutetium oxyorthosilicate (LSO) provide enough light for this application. The energy spectra of segmented crystals show clearly distinct photopeaks for each segment and the photopeak separation can be adjusted by altering the optical couple between segments. An ambiguity exists between photopeak events from an attenuated crystal and scattered events from the crystal without attenuation. This leads to the same error as a system with no depth information. Using 10 mm segments the authors find that the fraction of the events in the lower energy window due to scatter contamination in 2-segment (3-segment) crystals increases from 8% (13%) to 32% (60%) for a source in air vs. behind 16 cm of water. In imaging situations with minimal scatter medium (e.g. rodents) DOI is accurately provided by the segmented crystals, while in the presence of scatter (e.g. WB, cardiac) the method is only partially effective, and improvements in sensitivity, image quality and reduced scanner cost must be carefully evaluated.
Sponsorship	IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD
Starting Page	2144
Ending Page	2148
Page Count	5
File Size	603002
File Format	PDF
ISSN	00189499
Volume Number	45
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Positron emission tomography Crystals Optical scattering Light scattering Optical attenuators Image segmentation Solid scintillation detectors Photodetectors Instruments Optical sensors
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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