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Title: X-ray and gamma ray detector readout system

Abstract

A readout electronics scheme is under development for high resolution, compact PET (positron emission tomography) imagers based on LSO (lutetium ortho-oxysilicate, Lu.sub.2SiO.sub.5) scintillator and avalanche photodiode (APD) arrays. The key is to obtain sufficient timing and energy resolution at a low power level, less than about 30 mW per channel, including all required functions. To this end, a simple leading edge level crossing discriminator is used, in combination with a transimpedance preamplifier. The APD used has a gain of order 1,000, and an output noise current of several pA/ Hz, allowing bipolar technology to be used instead of CMOS, for increased speed and power efficiency. A prototype of the preamplifier and discriminator has been constructed, achieving timing resolution of 1.5 ns FWHM, 2.7 ns full width at one tenth maximum, relative to an LSO/PMT detector, and an energy resolution of 13.6% FWHM at 511 keV, while operating at a power level of 22 mW per channel. Work is in progress towards integration of this preamplifier and discriminator with appropriate coincidence logic and amplitude measurement circuits in an ASIC suitable for a high resolution compact PET instrument. The detector system and/or ASIC can also be used for many other applications formore » medical to industrial imaging.

Inventors:
 [1];  [2];  [3]
+ Show Inventor Affiliations
  1. Riverside, CA
  2. Los Angeles, CA
  3. Bloomington, IN
Issue Date:
Research Org.:
Nova R&D, Inc. (Riverside, CA)
Sponsoring Org.:
USDOE
OSTI Identifier:
1016123
Patent Number(s):
7818047
Application Number:
10/291,251
Assignee:
Nova R&D, Inc. (Riverside, CA)
Patent Classifications (CPCs):
A - HUMAN NECESSITIES A61 - MEDICAL OR VETERINARY SCIENCE A61B - DIAGNOSIS
G - PHYSICS G01 - MEASURING G01T - MEASUREMENT OF NUCLEAR OR X-RADIATION
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DOE Contract Number:  
FG03-00ER83058
Resource Type:
Patent
Country of Publication:
United States
Language:
English

Citation Formats

Tumer, Tumay O, Clajus, Martin, and Visser, Gerard. X-ray and gamma ray detector readout system. United States: N. p., 2010. Web.
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Tumer, Tumay O, Clajus, Martin, & Visser, Gerard. X-ray and gamma ray detector readout system. United States.
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Tumer, Tumay O, Clajus, Martin, and Visser, Gerard. Tue . "X-ray and gamma ray detector readout system". United States. https://www.osti.gov/servlets/purl/1016123.
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@article{osti_1016123,
title = {X-ray and gamma ray detector readout system},
author = {Tumer, Tumay O and Clajus, Martin and Visser, Gerard},
abstractNote = {A readout electronics scheme is under development for high resolution, compact PET (positron emission tomography) imagers based on LSO (lutetium ortho-oxysilicate, Lu.sub.2SiO.sub.5) scintillator and avalanche photodiode (APD) arrays. The key is to obtain sufficient timing and energy resolution at a low power level, less than about 30 mW per channel, including all required functions. To this end, a simple leading edge level crossing discriminator is used, in combination with a transimpedance preamplifier. The APD used has a gain of order 1,000, and an output noise current of several pA/ Hz, allowing bipolar technology to be used instead of CMOS, for increased speed and power efficiency. A prototype of the preamplifier and discriminator has been constructed, achieving timing resolution of 1.5 ns FWHM, 2.7 ns full width at one tenth maximum, relative to an LSO/PMT detector, and an energy resolution of 13.6% FWHM at 511 keV, while operating at a power level of 22 mW per channel. Work is in progress towards integration of this preamplifier and discriminator with appropriate coincidence logic and amplitude measurement circuits in an ASIC suitable for a high resolution compact PET instrument. The detector system and/or ASIC can also be used for many other applications for medical to industrial imaging.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {10}
}
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Works referenced in this record:

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