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Cone beam computed tomography for imaging orbital trauma—image quality and radiation dose compared with conventional multislice computed tomography

  • Author Footnotes
    1 Present address: The Royal Marsden Hospital NHS Foundation Trust, Fulham Road, London SW3 6JJ, United Kingdom. Tel.: +44 020 78082505.
    Jessica Brisco
    Footnotes
    1 Present address: The Royal Marsden Hospital NHS Foundation Trust, Fulham Road, London SW3 6JJ, United Kingdom. Tel.: +44 020 78082505.
    Affiliations
    Medical Physics, Weston Park Hospital, Whitham Road, Sheffield S10 2SJ, United Kingdom
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  • Author Footnotes
    2 Tel.: +44 0114 2265181.
    Karen Fuller
    Footnotes
    2 Tel.: +44 0114 2265181.
    Affiliations
    Medical Physics, Weston Park Hospital, Whitham Road, Sheffield S10 2SJ, United Kingdom
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  • Author Footnotes
    3 Tel.: +44 0114 2717859.
    Nicholas Lee
    Footnotes
    3 Tel.: +44 0114 2717859.
    Affiliations
    Charles Clifford Dental Hospital, Wellesley Road, Sheffield S10 2SZ, United Kingdom
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  • David Andrew
    Correspondence
    Corresponding author. Tel.: +44 0114 2717830; fax: +44 0114 2717863.
    Affiliations
    Unit of Oral & Maxillofacial Surgery, School of Clinical Dentistry, Claremont Crescent, Sheffield S10 2TA, United Kingdom
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  • Author Footnotes
    1 Present address: The Royal Marsden Hospital NHS Foundation Trust, Fulham Road, London SW3 6JJ, United Kingdom. Tel.: +44 020 78082505.
    2 Tel.: +44 0114 2265181.
    3 Tel.: +44 0114 2717859.
Published:October 21, 2013DOI:https://doi.org/10.1016/j.bjoms.2013.09.011

      Abstract

      We compared the image quality and radiation dose to the lens of the eye in patients with suspected orbital fractures who were imaged using cone beam computed tomography (CBCT) or conventional multislice computed tomography (CT). Although CBCT has a lower radiation dose than conventional CT, it is not known whether the image quality is comparable for diagnostic purposes. We identified fractures of the orbit (floor or roof, or both) in 6/10 patients who were scanned using CBCT and in 5/10 patients who were scanned using multislice CT (orbital floor and medial wall). Impingement of the rectus muscle on fracture lines was identified with both techniques, but retro-orbital haemorrhage was detected only on multislice CT. The mean radiation dose to the lens of the eye was 42% lower (range 23–53, SD 10) for CBCT than for multislice CT (p < 0.001), and the effective dose (a measure of the risk of developing a radiation-induced cancer) was also significantly lower. CBCT can therefore be used to diagnose orbital fractures, and is associated with a significantly lower radiation dose than multislice CT.

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