A new method of performance verification for x-ray computed tomography measurements

Fabien Leonard, S. B. Brown, P. J. Withers, P. M. Mummery, M. B. McCarthy

    Research output: Contribution to journalArticlepeer-review


    Through its ability to measure otherwise inaccessible internal structures, x-ray computed tomography (CT) has become a useful tool in the field of dimensional metrology. However, the lack of international standards for performance verification and the determination of metrological characteristics has so far prevented it from becoming a standardized measurement technology. This paper considers how a test object comprising a dismantleable tetrahedral assembly of four calibrated alumina spheres can be employed to assess the metrological performance of an industrial-type CT system. The measurement accuracy was characterized in terms of sphere size, separation and form errors. In all cases, sub-voxel accuracy was achieved, with errors as small as 1/10 of a voxel being obtained. Good measurement repeatability was demonstrated even upon dismantling and reconstructing the reference object. The tetrahedral test object offers a simple robust solution for the verification of metrological performance with great versatility and adaptability. © 2014 IOP Publishing Ltd.
    Original languageEnglish
    Article number065401
    JournalMeasurement Science and Technology
    Issue number6
    Publication statusPublished - 2014


    • accuracy
    • coordinate measuring machine (CMM)
    • coordinate metrology
    • CT
    • dimensional metrology
    • repeatability
    • x-ray tomography


    Dive into the research topics of 'A new method of performance verification for x-ray computed tomography measurements'. Together they form a unique fingerprint.

    Cite this