NDLI: Reconstruction of UCL Germanium Compton Camera Data Using ITEM

Content Provider	IEEE Xplore Digital Library
Author	Dedek, N. Ghoggali, W. Horrocks, J. Royle, G.J. Speller, R.D.
Copyright Year	1963
Abstract	Various Cs-137 source distributions were imaged with the UCL (University College London) Germanium Compton camera. A reduced camera setup was used consisting of 16 pixels of 4 times 4 times 4 mm³ size each in the front detector and 4 pixels of 4 times 4 times 10 mm³ size each in the back detector. The preamplifier signal was digitised by GRT4 VME readout cards. The deposited energy was extracted online using the moving window deconvolution technique implemented in the FPGAs of the GRT4 cards. A pulse height determination algorithm leading to worse energy resolution was applied offline for comparative studies. For the image reconstruction ITEM (Imaginary Time Expectation Maximization) was used, an iterative algorithm based on quantum mechanics energy minimization. ITEM is very flexible and can easily be applied to every possible Compton camera geometry. An improved backprojection taking into account the changing camera sensitivity in the image space has been used and its limitations investigated. ITEM is shown to work very fast. An image with 10000 pixels can be reconstructed from 40000 events in about 20 s using one 3 GHz Pentium CPU. Data was taken with point, line and circular sources in a plane 2 cm from the front detector. Through analysis of point and line spread functions the angular resolution of the camera was estimated to be around 10 deg.
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	1340
Ending Page	1350
Page Count	11
File Size	3551617
File Format	PDF
ISSN	00189499
Volume Number	56
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Germanium Cameras Image reconstruction Detectors Iterative algorithms Educational institutions Preamplifiers Signal detection Deconvolution Field programmable gate arrays reconstruction Compton imaging gamma-ray ITEM medical imaging nuclear medicine
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering

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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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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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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