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A simulation-based study on the influence of beam hardening in x-ray computed tomography for dimensional metrology

A simulation-based study on the influence of beam hardening in x-ray computed tomography for dimensional metrology
A simulation-based study on the influence of beam hardening in x-ray computed tomography for dimensional metrology
X-ray computed tomography (CT) is a radiographic scanning technique for visualising cross-sectional images of an object non-destructively. From these cross-sectional images it is possible to evaluate internal dimensional features of a workpiece which may otherwise be inaccessible to tactile and optical instruments. Beam hardening is a physical process that degrades the quality of CT images and has previously been suggested to influence dimensional measurements. Using a validated simulation tool, the influence of spectrum pre-filtration and beam hardening correction are evaluated for internal and external dimensional measurements. Beam hardening is shown to influence internal and external dimensions in opposition, and to have a greater influence on outer dimensions compared to inner dimensions. The results suggest the combination of spectrum pre-filtration and a local gradient-based surface determination method are able to greatly reduce the influence of beam hardening in X-ray CT for dimensional metrology.
computed tomography, beam hardening, dimensional metrology, x-ray spectrum estimation, ISO50, surface determination
0895-3996
62-82
Lifton, Joseph J.
e4b170b4-165c-4ae0-9e7d-9d53ab54247f
Malcolm, Andrew A.
4219e6dc-66a8-4c5c-87ef-3ed1b46d5617
McBride, John W.
d9429c29-9361-4747-9ba3-376297cb8770
Lifton, Joseph J.
e4b170b4-165c-4ae0-9e7d-9d53ab54247f
Malcolm, Andrew A.
4219e6dc-66a8-4c5c-87ef-3ed1b46d5617
McBride, John W.
d9429c29-9361-4747-9ba3-376297cb8770

Lifton, Joseph J., Malcolm, Andrew A. and McBride, John W. (2015) A simulation-based study on the influence of beam hardening in x-ray computed tomography for dimensional metrology. Journal of X-Ray Science and Technology, 23 (1), 62-82. (doi:10.3233/XST-140471).

Record type: Article

Abstract

X-ray computed tomography (CT) is a radiographic scanning technique for visualising cross-sectional images of an object non-destructively. From these cross-sectional images it is possible to evaluate internal dimensional features of a workpiece which may otherwise be inaccessible to tactile and optical instruments. Beam hardening is a physical process that degrades the quality of CT images and has previously been suggested to influence dimensional measurements. Using a validated simulation tool, the influence of spectrum pre-filtration and beam hardening correction are evaluated for internal and external dimensional measurements. Beam hardening is shown to influence internal and external dimensions in opposition, and to have a greater influence on outer dimensions compared to inner dimensions. The results suggest the combination of spectrum pre-filtration and a local gradient-based surface determination method are able to greatly reduce the influence of beam hardening in X-ray CT for dimensional metrology.

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More information

Accepted/In Press date: 6 November 2014
Published date: 2015
Keywords: computed tomography, beam hardening, dimensional metrology, x-ray spectrum estimation, ISO50, surface determination
Organisations: Mechatronics

Identifiers

Local EPrints ID: 382625
URI: http://eprints.soton.ac.uk/id/eprint/382625
ISSN: 0895-3996
PURE UUID: edb18907-5e80-4c86-bb0f-0b2a761f5e5d

Catalogue record

Date deposited: 02 Nov 2015 14:09
Last modified: 21 Oct 2019 19:07

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