NDLI: A targeted sparse readout for multi-anode photo-multipliers and optically isolated crystals

Content Provider	IEEE Xplore Digital Library
Author	Clancy, R.L. Thompson, C.J. Robar, J.L. Murthy, K. Beuville, E. Moses, W.W.
Copyright Year	1996
Description	Author affiliation: Neurological Inst., McGill Univ., Montreal, Que., Canada (Clancy, R.L.; Thompson, C.J.; Robar, J.L.; Murthy, K.)
Abstract	Multi anode photo-multipliers are able to localize the position of a light source, and measure its intensity. Normally these devices have their anode wires connected to a resistor network. If the light originates in an optically collimated, pixilated scintillation crystal array, only a few of the anode wires receive any significant signal. If only those wires whose signal is above the noise threshold are used to localize the light, the signal-to-noise ratio improves (same signal but less noise). We found that only about 6 wires on each axis have a significant signal when a 511 keV gamma ray is detected in a 2 mm/spl times/2 mm BGO crystal. Using a custom made integrated circuit which provides the binary code of the address corresponding to the biggest of 16 analog inputs, and a sample-and-hold on each anode wire we hope to direct a six channel ADC to sample the anode wires which provide the best positioning signal on each axis of the PMT. The shape of the signal envelope permits identification of crystals which would otherwise be beyond the PMT's field of view. This readout should enhance these PMTs in application like positron emission mammography, and small animal PET imaging.
Starting Page	409
Ending Page	411
File Size	262429
Page Count	3
File Format	PDF
ISBN	078033180X
DOI	10.1109/NSSMIC.1995.504255
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-10-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anodes Wires Optical noise Signal to noise ratio Optical arrays Integrated circuit noise Light sources Position measurement Resistors Optical collimators
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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