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Title: System for uncollimated digital radiography

Abstract

The inversion algorithm based on the maximum entropy method (MEM) removes unwanted effects in high energy imaging resulting from an uncollimated source interacting with a finitely thick scintillator. The algorithm takes as input the image from the thick scintillator (TS) and the radiography setup geometry. The algorithm then outputs a restored image which appears as if taken with an infinitesimally thin scintillator (ITS). Inversion is accomplished by numerically generating a probabilistic model relating the ITS image to the TS image and then inverting this model on the TS image through MEM. This reconstruction technique can reduce the exposure time or the required source intensity without undesirable object blurring on the image by allowing the use of both thicker scintillators with higher efficiencies and closer source-to-detector distances to maximize incident radiation flux. The technique is applicable in radiographic applications including fast neutron, high-energy gamma and x-ray radiography using thick scintillators.

Inventors:
; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1209343
Patent Number(s):
9,105,087
Application Number:
13/945,351
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA) LSO
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Jul 18
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Wang, Han, Hall, James M., McCarrick, James F., and Tang, Vincent. System for uncollimated digital radiography. United States: N. p., 2015. Web.
Wang, Han, Hall, James M., McCarrick, James F., & Tang, Vincent. System for uncollimated digital radiography. United States.
Wang, Han, Hall, James M., McCarrick, James F., and Tang, Vincent. Tue . "System for uncollimated digital radiography". United States. doi:. https://www.osti.gov/servlets/purl/1209343.
@article{osti_1209343,
title = {System for uncollimated digital radiography},
author = {Wang, Han and Hall, James M. and McCarrick, James F. and Tang, Vincent},
abstractNote = {The inversion algorithm based on the maximum entropy method (MEM) removes unwanted effects in high energy imaging resulting from an uncollimated source interacting with a finitely thick scintillator. The algorithm takes as input the image from the thick scintillator (TS) and the radiography setup geometry. The algorithm then outputs a restored image which appears as if taken with an infinitesimally thin scintillator (ITS). Inversion is accomplished by numerically generating a probabilistic model relating the ITS image to the TS image and then inverting this model on the TS image through MEM. This reconstruction technique can reduce the exposure time or the required source intensity without undesirable object blurring on the image by allowing the use of both thicker scintillators with higher efficiencies and closer source-to-detector distances to maximize incident radiation flux. The technique is applicable in radiographic applications including fast neutron, high-energy gamma and x-ray radiography using thick scintillators.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 11 00:00:00 EDT 2015},
month = {Tue Aug 11 00:00:00 EDT 2015}
}

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Works referenced in this record:

Reconstruction algorithm for point source neutron imaging through finite thickness scintillator
journal, November 2012

  • Wang, H.; Tang, V.; McCarrick, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 693, p. 294-301
  • DOI: 10.1016/j.nima.2012.07.018

Position determination of scatter signatures – A novel sensor geometry
journal, December 2010