Correction of beam hardening in X-ray radiograms.

Loading...
Thumbnail Image

Date

2019-02

Journal Title

Journal ISSN

Volume Title

Repository Usage Stats

52
views
170
downloads

Citation Stats

Abstract

The intensity of a monochromatic X-ray beam decreases exponentially with the distance it has traveled inside a material; this behavior is commonly referred to as Beer-Lambert's law. Knowledge of the material-specific attenuation coefficient μ allows us to determine the thickness of a sample from the intensity decrease the beam has experienced. However, classical X-ray tubes emit a polychromatic bremsstrahlung-spectrum. And the attenuation coefficients of all materials depend on the photon energy: photons with high energy are attenuated less than photons with low energy. In consequence, the X-ray spectrum changes while traveling through the medium; due to the relative increase in high energy photons, this effect is called beam hardening. For this varying spectrum, the Beer-Lambert law only remains valid if μ is replaced by an effective attenuation coefficient μeff which depends not only on the material but also on its thickness x and the details of the X-ray setup used. We present here a way to deduce μeff(x) from a small number of auxiliary measurements using a phenomenological model. This model can then be used to determine an unknown material thickness or in the case of a granular media its volume fraction.

Department

Description

Provenance

Citation

Published Version (Please cite this version)

10.1063/1.5080540

Publication Info

Baur, Manuel, Norman Uhlmann, Thorsten Pöschel and Matthias Schröter (2019). Correction of beam hardening in X-ray radiograms. The Review of scientific instruments, 90(2). p. 025108. 10.1063/1.5080540 Retrieved from https://hdl.handle.net/10161/20161.

This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.

Scholars@Duke

Schroter

Matthias Schroter

Visiting Associate Professor of DKU Studies at Duke University

I am interested in (in order of appearance): Greek philosophy, pattern formation, minimal music, granular matter, meditation, X-ray tomography, machine learning,  ....


Unless otherwise indicated, scholarly articles published by Duke faculty members are made available here with a CC-BY-NC (Creative Commons Attribution Non-Commercial) license, as enabled by the Duke Open Access Policy. If you wish to use the materials in ways not already permitted under CC-BY-NC, please consult the copyright owner. Other materials are made available here through the author’s grant of a non-exclusive license to make their work openly accessible.