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System for uncollimated digital radiography

Patent ·
OSTI ID:1209343
; ; ;
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.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC52-07NA27344
Assignee:
Lawrence Livermore National Security, LLC (Livermore, CA)
Patent Number(s):
9,105,087
Application Number:
13/945,351
OSTI ID:
1209343
Country of Publication:
United States
Language:
English

References (7)

Maximum Entropy Image Reconstruction journal April 1977
Scatter in an uncollimated x-ray CT machine based on a Geant4 Monte Carlo simulation conference March 2010
Reconstruction algorithm for point source neutron imaging through finite thickness scintillator
  • 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 https://doi.org/10.1016/j.nima.2012.07.018
journal November 2012
An iterative three-dimensional electron density imaging algorithm using uncollimated Compton scattered x rays from a polyenergetic primary pencil beam: Three-dimensional electron density imaging using Compton scattered x rays journal December 2006
Mammographic image restoration using maximum entropy deconvolution journal October 2004
Position determination of scatter signatures – A novel sensor geometry journal December 2010
Accurate scatter correction for transmission computed tomography using an uncollimated line array source journal February 2004

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