Assessment of distortion in a three-dimensional rotational angiography system

RR Bridcut, John Winder, A Workman, P Flynn

    Research output: Contribution to journalArticle

    21 Citations (Scopus)

    Abstract

    The purpose of this project was to determine the degree of geometrical distortion in a three-dimensional (3D) image volume generated by a digital fluorography system with rotational image acquisition capabilities. 3D imaging is a valuable adjunct in neuroangiography for visualization and measurement of cerebral aneurysms and for determination of the optimum projection for intervention. To enable spatially accurate 3D reconstruction the system must correct for geometrical distortion in the image intensifier television system as well as for deviations in gantry motion. 3D volumes were reconstructed from 100 X-ray projections acquired over a 180degrees arc over a period of 8 s. A phantom was constructed to assess geometrical distortion in the three dimensions. The phantom consisted of I mm diameter ball bearings embedded in Perspex in a cubic lattice configuration. The ball bearings were placed at 20 mm intervals over a 140 mm cubic volume. Distortion vas assessed by taking measurements between points of known separation and using a differential distortion measurement. The maximum error in the 3D location of objects was found to be 1.4 mm, while the differential distortion was found to range from -1.0% to +2.3%. The 3D images were found to have negligible visual distortion, enabling subjective assessments to be made with confidence to aid intervention.
    LanguageEnglish
    Pages266-270
    JournalBritish Journal of Radiology
    Volume75
    Issue number891
    Publication statusPublished - Mar 2002

    Fingerprint

    angiography
    ball bearings
    projection
    television systems
    Perspex (trademark)
    gantry cranes
    image intensifiers
    cubic lattices
    confidence
    acquisition
    arcs
    intervals
    deviation
    configurations

    Cite this

    Bridcut, RR., Winder, J., Workman, A., & Flynn, P. (2002). Assessment of distortion in a three-dimensional rotational angiography system. British Journal of Radiology, 75(891), 266-270.
    Bridcut, RR ; Winder, John ; Workman, A ; Flynn, P. / Assessment of distortion in a three-dimensional rotational angiography system. In: British Journal of Radiology. 2002 ; Vol. 75, No. 891. pp. 266-270.
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    Bridcut, RR, Winder, J, Workman, A & Flynn, P 2002, 'Assessment of distortion in a three-dimensional rotational angiography system', British Journal of Radiology, vol. 75, no. 891, pp. 266-270.

    Assessment of distortion in a three-dimensional rotational angiography system. / Bridcut, RR; Winder, John; Workman, A; Flynn, P.

    In: British Journal of Radiology, Vol. 75, No. 891, 03.2002, p. 266-270.

    Research output: Contribution to journalArticle

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    N2 - The purpose of this project was to determine the degree of geometrical distortion in a three-dimensional (3D) image volume generated by a digital fluorography system with rotational image acquisition capabilities. 3D imaging is a valuable adjunct in neuroangiography for visualization and measurement of cerebral aneurysms and for determination of the optimum projection for intervention. To enable spatially accurate 3D reconstruction the system must correct for geometrical distortion in the image intensifier television system as well as for deviations in gantry motion. 3D volumes were reconstructed from 100 X-ray projections acquired over a 180degrees arc over a period of 8 s. A phantom was constructed to assess geometrical distortion in the three dimensions. The phantom consisted of I mm diameter ball bearings embedded in Perspex in a cubic lattice configuration. The ball bearings were placed at 20 mm intervals over a 140 mm cubic volume. Distortion vas assessed by taking measurements between points of known separation and using a differential distortion measurement. The maximum error in the 3D location of objects was found to be 1.4 mm, while the differential distortion was found to range from -1.0% to +2.3%. The 3D images were found to have negligible visual distortion, enabling subjective assessments to be made with confidence to aid intervention.

    AB - The purpose of this project was to determine the degree of geometrical distortion in a three-dimensional (3D) image volume generated by a digital fluorography system with rotational image acquisition capabilities. 3D imaging is a valuable adjunct in neuroangiography for visualization and measurement of cerebral aneurysms and for determination of the optimum projection for intervention. To enable spatially accurate 3D reconstruction the system must correct for geometrical distortion in the image intensifier television system as well as for deviations in gantry motion. 3D volumes were reconstructed from 100 X-ray projections acquired over a 180degrees arc over a period of 8 s. A phantom was constructed to assess geometrical distortion in the three dimensions. The phantom consisted of I mm diameter ball bearings embedded in Perspex in a cubic lattice configuration. The ball bearings were placed at 20 mm intervals over a 140 mm cubic volume. Distortion vas assessed by taking measurements between points of known separation and using a differential distortion measurement. The maximum error in the 3D location of objects was found to be 1.4 mm, while the differential distortion was found to range from -1.0% to +2.3%. The 3D images were found to have negligible visual distortion, enabling subjective assessments to be made with confidence to aid intervention.

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    Bridcut RR, Winder J, Workman A, Flynn P. Assessment of distortion in a three-dimensional rotational angiography system. British Journal of Radiology. 2002 Mar;75(891):266-270.