NDLI: Investigation of noise equivalent count rate in positron imaging using a dual head gamma camera

Content Provider	IEEE Xplore Digital Library
Author	Brasse, D. Tararine, M. Lamer, O. Bendriem, B.
Copyright Year	1963
Abstract	In positron imaging, image quality depends on scatter, random and coincidence rate. It is known that noise equivalent count (NEC) rate is a good indicator of image quality and that it helps optimizing acquisition parameters. We measured the NEC curve with a SophyCamera DST (SMV) using a 20 cm cylinder phantom filled with /sup 18/F (59 MBq). The field of view of the DST is determined by two rectangular parallel detectors (400*300 mm) separated by 720 mm and each scintillation detector is composed of a 3/8 of an inch thick NaI:Tl crystal. The coincidence time window was set to 15 ns and the scatter fraction (sf) was measured using a PET NEMA protocol. We measured random and coincident count rates using tomographic acquisition with two 20% energy windows centered on 511 KeV (photopeak) and 417 KeV (Compton) over 6 half-lives of /sup 18/F. We investigated the random coincidence rate by delaying signals from one of the coincident detectors (45 ns) and measured system sensitivity as the slope at the origin of the NEC curve. The NEC rate peaked at 199 cps for photopeak (with a 0.20 sf) and at 252 cps for photopeak+Compton (with 0.28 sf) coincidences. These maxima were attained over activity concentration values ranging from 1.33 kBq/cc to 1.85 kBq/cc. Our results show that image quality improves when using photopeak+Compton coincidences with a 30% greater sensitivity and an increased NEC rate.
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	438
Ending Page	442
Page Count	5
File Size	624529
File Format	PDF
ISSN	00189499
Volume Number	45
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	National electric code Image quality Scattering Energy measurement Imaging phantoms Solid scintillation detectors Scintillation counters Time measurement Positron emission tomography Protocols
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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