NDLI: Imaging results with a LaBr-based rotational modulator

Content Provider	IEEE Xplore Digital Library
Author	Budden, B. Case, G.L. Cherry, M.L.
Copyright Year	2009
Description	Author affiliation: Dept. of Physics & Astronomy, Louisiana State University, LA 70803 (Budden, B.; Case, G.L.; Cherry, M.L.)
Abstract	A gamma-ray imager based on rotational modulation is capable of obtaining significantly better angular resolution than the fundamental geometric resolution defined by the ratio of detector diameter to mask-detector separation. Compared to a standard coded aperture or Compton telescope, a Rotational Modulator (RM) requires a detection plane with only modest spatial resolution, and is consequently less complex. A prototype of this concept developed at LSU features high sensitivity and energy resolution, and a simple readout system. The instrument consists of a single grid of 1.5" wide lead slats separated by 1.5" and spaced 1.2 m in front of an array of 19 1.5" x1" thick LaBr3:Ce scintillators in a concentric circular layout. As the grid rotates, the transmission from a source is modulated on each detector between 0 and 100%. This count profile is cross-correlated with pre-calculated modulation profiles to produce an initial source image. A novel reconstruction technique deconvolves this image with the point-spread function to reduce the effects of noise and resolve sources to within 20', or about 6x better than the geometric resolution of the instrument. We describe this reconstruction technique, and present imaging and spectral results for the RM prototype.
Starting Page	662
Ending Page	667
File Size	634318
Page Count	6
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5402020
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image resolution Spatial resolution Energy resolution Prototypes Instruments Image reconstruction Optical imaging Gamma ray detection Gamma ray detectors Code standards X-ray Gamma ray Image Reconstruction Lanthanum Bromide Rotational Modulation Scintillator
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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