NDLI: Design of patient shielding to reduce the effects of out-of-field radioactivity in 3D PET

Content Provider	IEEE Xplore Digital Library
Author	Daube-Witherspoon, M.E. Belakhlef, A. Green, S.L. Zanzi, I.
Copyright Year	1999
Description	Author affiliation: PET Dept., Nat. Inst. of Health, Bethesda, MD, USA (Daube-Witherspoon, M.E.)
Abstract	Randoms, deadtime, and scatter from activity outside the scanner are potential sources of bias and noise in volume positron emission tomography (PET). Additional scanner shielding has been shown to reduce the effects of out-of-field activity (OFA) in brain imaging. We have undertaken the design of an OFA shielding that is also effective for body imaging. The shielding consists of lead sheet that is molded around, but not touching, a subject to surround the area(s) of OFA. The effectiveness of the shielding at reducing the singles flux and scattered coincidences from OFA was studied on the GE Advance PET scanner as a function of shielding thickness and axial width, patient-shielding gap, and axial source location. The optimal design was found to be 3-6-mm thick lead sheet that extends 10-15 cm from the OFA towards the scanner with a small (1-2 cm) gap between the patient and shielding allowed. With such shielding, singles are reduced by 50-70% for source positions out to 25 cm from the edge of the axial field of view, while scatter is reduced by 65-90%.
Starting Page	1237
Ending Page	1242
File Size	518866
Page Count	6
File Format	PDF
ISBN	0780350219
ISSN	10823654
DOI	10.1109/NSSMIC.1998.774382
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-11-08
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Positron emission tomography Lead Brain Imaging phantoms Hospitals Position measurement Detectors Apertures Electromagnetic scattering Particle scattering
Content Type	Text
Resource Type	Article

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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
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