NDLI: The ECAT HRRT: an example of NEMA scatter estimation issues for LSO-based PET systems

Content Provider	IEEE Xplore Digital Library
Author	Eriksson, L. Watson, C.C. Wienhard, K. Eriksson, M. Casey, M.E. Knoess, C. Lenox, M. Burbar, Z. Conti, M. Bendriem, B. Heiss, W.D. Nutt, R.
Copyright Year	1963
Abstract	The ECAT high-resolution research tomograph (HRRT) is a three-dimensional (3-D)-only dedicated brain positron emission tomograph with LSO and GSO scintillators. In this paper, the system has been looked at as an example of issues that need to be addressed when evaluating LSO-based system following the recent NEMA NU 2-2001 protocols. The LSO scintillators contain the isotope /sup 176/Lu which is radioactive and creates a small amount of single counts and, depending on the low level discriminator threshold for validated singles, also true coincidence events from a cascade of gamma rays following the beta decay of /sup 176/Lu into /sup 176/Hf. The presence of intrinsic random and true coincidence events has an effect on the scatter fraction determination if using the guidelines according to NU 2-2001. We show here that these guidelines have to be changed in order to obtain accurate determination of the scatter fraction. In this paper, we have determined the scatter fraction for different low level discriminator settings. Since the scatter fraction determinations also comprise full count rate studies for the NEMA phantom, we have in addition extracted the sensitivity information for singles, true + scatter, and for the NEC data.
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	90
Ending Page	94
Page Count	5
File Size	240564
File Format	PDF
ISSN	00189499
Volume Number	52
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Scattering Positron emission tomography Guidelines Radioactive decay Protocols Isotopes Gamma ray effects Hafnium Imaging phantoms Data mining positron emission tomography (PET) Intrinsic radiation LSO NEMA NU 2-2001
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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The ECAT HRRT: an example of NEMA scatter estimation issues for LSO based PET systems

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The ECAT HRRT: an example of NEMA scatter estimation issues for LSO-based PET systems

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