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X-ray beam hardening correction for measuring density in linear accelerator industrial computed tomography

Funding organization: 国家自然科学基金(60672098)

Journal Title: 中国物理C(英文版) 2009, Vol.33(7), pp.599-602
Main Author: ZHOU Ri-Feng
Other Authors: WANG Jue , CHEN Wei-Min
Format: Electronic Article Electronic Article
Language: chi
Subjects:
ID: ISSN: 1674-1137 ; Classification: O4
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recordid: wanfang_jourzgwl-c200907018
title: X-ray beam hardening correction for measuring density in linear accelerator industrial computed tomography
format: Article
creator:
  • ZHOU Ri-Feng
  • WANG Jue
  • CHEN Wei-Min
subjects:
  • Linac Ict
  • Beam Hardening Correction
  • Density Measurement
ispartof: 中国物理C(英文版), 2009, Vol.33(7), pp.599-602
description: Funding organization: 国家自然科学基金(60672098)
language: chi
source:
identifier: ISSN: 1674-1137 ; Classification: O4
fulltext: no_fulltext
issn:
  • 1674-1137
  • 16741137
url: Link


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titleX-ray beam hardening correction for measuring density in linear accelerator industrial computed tomography
creatorZHOU Ri-Feng ; WANG Jue ; CHEN Wei-Min
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0Funding organization: 国家自然科学基金(60672098)
1Due to X-ray attenuation being approximately proportional to material density, it is possible to measure the inner density through Industrial Computed Tomography (ICT) images accurately. In practice, however, a number of factors including the non-linear effects of beam hardening and diffuse scattered radia-tion complicate the quantitative measurement of density variations in materials. This paper is based on the linearization method of beam hardening correction, and uses polynomial fitting coefficient which is obtained by the curvature of iron polychromatic beam data to fit other materials. Through theoretical deduction, the paper proves that the density measure error is less than 2% if using pre-filters to make the spectrum of linear accelerator range mainly 0.3 MeV to 3 MeV. Experiment had been set up at an ICT system with a 9 MeV electron linear accelerator. The result is satisfactory. This technique makes the beam hardening correction easy and simple, and it is valuable for measuring the ICT density and making use of the CT images to recognize materials.
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titleX-ray beam hardening correction for measuring density in linear accelerator industrial computed tomography
descriptionDue to X-ray attenuation being approximately proportional to material density, it is possible to measure the inner density through Industrial Computed Tomography (ICT) images accurately. In practice, however, a number of factors including the non-linear effects of beam hardening and diffuse scattered radia-tion complicate the quantitative measurement of density variations in materials. This paper is based on the linearization method of beam hardening correction, and uses polynomial fitting coefficient which is obtained by the curvature of iron polychromatic beam data to fit other materials. Through theoretical deduction, the paper proves that the density measure error is less than 2% if using pre-filters to make the spectrum of linear accelerator range mainly 0.3 MeV to 3 MeV. Experiment had been set up at an ICT system with a 9 MeV electron linear accelerator. The result is satisfactory. This technique makes the beam hardening correction easy and simple, and it is valuable for measuring the ICT density and making use of the CT images to recognize materials.
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abstractDue to X-ray attenuation being approximately proportional to material density, it is possible to measure the inner density through Industrial Computed Tomography (ICT) images accurately. In practice, however, a number of factors including the non-linear effects of beam hardening and diffuse scattered radia-tion complicate the quantitative measurement of density variations in materials. This paper is based on the linearization method of beam hardening correction, and uses polynomial fitting coefficient which is obtained by the curvature of iron polychromatic beam data to fit other materials. Through theoretical deduction, the paper proves that the density measure error is less than 2% if using pre-filters to make the spectrum of linear accelerator range mainly 0.3 MeV to 3 MeV. Experiment had been set up at an ICT system with a 9 MeV electron linear accelerator. The result is satisfactory. This technique makes the beam hardening correction easy and simple, and it is valuable for measuring the ICT density and making use of the CT images to recognize materials.
doi10.1088/1674-1137/33/7/018
eissn02543052