NDLI: A CsI-Active Pixel Sensor Based Detector for Gamma Ray Imaging

Content Provider	IEEE Xplore Digital Library
Author	Ott, R.J. Evans, N. Harris, E. Evans, P. Osmond, J. Holland, A. Prydderch, M. Clark, A. Crooks, J. Halsall, R. Key-Charriere, M. Martin, S. Turchetta, R.
Copyright Year	2006
Description	Author affiliation: Dept. of Phys., Inst. of Cancer Res., Sutton (Ott, R.J.; Evans, N.; Harris, E.; Evans, P.)
Abstract	A Startracker CMOS monolithic active pixel sensor with 525times525 pixels each 25 microns/side has been coupled via a fibre optic stud to a CsI(Tl) crystal 2mm times 20mm times 20mm to form a test detector of gamma rays of energy between 60 keV and 200 keV. The crystal is segmented into 400 micron elements separated by 100 microns of filler. The system records images at 10 f/sec and is interfaced to a PC via an FPGA-based DAQ and optical link. Image acquisition is performed using a MatLab-based GUI. Noise is measured to be ~100 electrons with a temperature dependence of ~0.4%/C indicating that the majority of noise is reset related or fixed pattern in nature rather than statistical thermal noise. Images have been acquired using a Tc99m source placed directly onto the CsI(Tl) crystals as well as through several lead collimators. The structure of the CsI(Tl) scintillator is easy resolved once a noise image is subtracted and an intrinsic spatial resolution of 80-90 microns is measured. The system spatial resolution with a collimator is ~450 microns for 140keV photons. The results indicate that the present APS has too high a noise level for imaging low energy photons but a new device with ~25 electrons noise plus the potential to provide on-chip signal thresholding and cluster analysis could become part of a large-area intelligent gamma ray imager with a sub-mm spatial resolution at 140 keV.
Starting Page	2990
Ending Page	2992
File Size	448662
Page Count	3
File Format	PDF
ISBN	1424405602
ISSN	10957863
DOI	10.1109/NSSMIC.2006.356503
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gamma ray detectors Pixel Image sensors Gamma ray detection Nuclear imaging Spatial resolution Optical noise Noise measurement Electrons Noise level
Content Type	Text
Resource Type	Article

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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