An initial experimental study on the influence of beam hardening in X-ray CT for dimensional metrology
An initial experimental study on the influence of beam hardening in X-ray CT for dimensional metrology
X-ray computed tomography (CT) enables the visualisation and dimensional evaluation of both the internal and external geometry of a workpiece, it is therefore well suited for measuring geometric features that are otherwise inaccessible to tactile and optical instruments. Beam hardening is a wellknown physical process that can degrade the quality of CT images and influence edge detection algorithms that define surface points used for dimensional evaluation. The influence of beam hardening on dimensional measurements has yet to be fully characterised; in this work a comparison is made between measurements evaluated with and without beam hardening correction. The results show beam hardening reduces internal dimensions and increases external dimensions; this effect is shown for two different surface determination methods in the absence of scattered radiation.
computed tomography, beam hardening, scatter, linearisation, beam stop array, surface determination
Lifton, Joseph
83e74f22-0218-4ad1-8cad-7493e0f89922
McBride, John
d9429c29-9361-4747-9ba3-376297cb8770
February 2014
Lifton, Joseph
83e74f22-0218-4ad1-8cad-7493e0f89922
McBride, John
d9429c29-9361-4747-9ba3-376297cb8770
Lifton, Joseph and McBride, John
(2014)
An initial experimental study on the influence of beam hardening in X-ray CT for dimensional metrology.
5th Conference on Industrial Computed Tomography, Austria, Wels, Austria.
25 - 28 Feb 2014.
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Conference or Workshop Item
(Paper)
Abstract
X-ray computed tomography (CT) enables the visualisation and dimensional evaluation of both the internal and external geometry of a workpiece, it is therefore well suited for measuring geometric features that are otherwise inaccessible to tactile and optical instruments. Beam hardening is a wellknown physical process that can degrade the quality of CT images and influence edge detection algorithms that define surface points used for dimensional evaluation. The influence of beam hardening on dimensional measurements has yet to be fully characterised; in this work a comparison is made between measurements evaluated with and without beam hardening correction. The results show beam hardening reduces internal dimensions and increases external dimensions; this effect is shown for two different surface determination methods in the absence of scattered radiation.
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Published date: February 2014
Venue - Dates:
5th Conference on Industrial Computed Tomography, Austria, Wels, Austria, 2014-02-25 - 2014-02-28
Keywords:
computed tomography, beam hardening, scatter, linearisation, beam stop array, surface determination
Organisations:
Mechatronics
Identifiers
Local EPrints ID: 389699
URI: http://eprints.soton.ac.uk/id/eprint/389699
PURE UUID: 41eefb5e-5274-4339-91b6-53c046db2b67
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Date deposited: 11 Mar 2016 16:55
Last modified: 12 Mar 2022 02:33
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Author:
Joseph Lifton
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