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Radiation exposure in paranasal sinus imaging

M J Sillers1, F A Kuhn, C L Vickery

  • 1Medical College of Georgia, Augusta.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|February 1, 1995
PubMed
Summary

Computed tomography (CT) is standard for paranasal sinus evaluation. This study measured radiation doses for various CT techniques, finding them to be less than 4% of the cataractogenic dose, ensuring patient safety.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Oncology

Background:

  • Plain film radiography was historically used for paranasal sinus imaging.
  • Computed tomography (CT) is now the standard due to superior resolution for evaluating paranasal sinus diseases.
  • Patients often undergo multiple CT scans during treatment, raising concerns about cumulative radiation exposure, particularly for cataract formation.

Purpose of the Study:

  • To quantify the radiation dose delivered by various paranasal sinus imaging techniques.
  • To assess the risk of radiation-induced cataracts associated with these imaging modalities.

Main Methods:

  • A cadaveric specimen was utilized for radiation dose measurements.
  • Thermoluminescent dosimeters were strategically placed over the orbits.

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  • Radiation exposure was measured for plain-film imaging, limited CT, standard axial/coronal CT, and thin-cut axial/coronal CT.

    • Main Results:

    • All tested paranasal sinus imaging techniques delivered radiation doses significantly below the threshold for cataract formation.
    • Measured doses were less than 4% of the acute radiation dose known to induce cataracts.

    Conclusions:

    • Current paranasal sinus CT imaging techniques pose a minimal risk of radiation-induced cataracts.
    • The radiation doses associated with paranasal sinus CT are well within safe limits for patients undergoing evaluation and treatment.