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Neuroradiology

, Volume 38, Supplement 1, pp S127–S129 | Cite as

Radiation dose to the lenses in CT of the paranasal sinuses

  • G. Moulin
  • C. Chagnaud
  • B. Le Brigand
  • J. M. Bartoli
  • S. Waultier
  • M. Espagnan
  • P. Châtenet
  • P. Dessi
  • G. Botti
Head and Neck Radiology

Abstract

The radiation dose to the lens during CT of the paranasal sinuses was measured in 20 patients. In 10 patients, a “standard” technique with axial and coronal sections was used. In the remaining 10 patients, overlapping axial sections for bidimensional reconstruction were obtained. Radiation dose was measured using thermoluminescent dosimeters. The mean dose was 22 mGy in patients who underwent “standard” CT and 42 mGy in those who underwent CT with overlapping sections. Dose was dependent on the total number of slices and of transorbital axial sections. Coronal sections did not statistically increase the radiation dose to the lenses. Although these doses were significantly below the critical dose for cataracts, CT with overlapping sections gives a considerably higher radiation dose. We recommend the bidimensional reconstruction technique only for selected cases (e. g. preoperative assessment of the roof of the ethmoid sinuses or in patients who can or should not maintain the hyperextended position required for coronal views).

Key words

Lens, ocular Sinuses, paranasal Computed tomography Radiation, diagnostic procedures 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • G. Moulin
    • 1
  • C. Chagnaud
    • 1
  • B. Le Brigand
    • 1
  • J. M. Bartoli
    • 1
  • S. Waultier
    • 2
  • M. Espagnan
    • 3
  • P. Châtenet
    • 3
  • P. Dessi
    • 4
  • G. Botti
    • 5
  1. 1.Department of RadiologyCHU la TimoneMarseille Cedex 5France
  2. 2.Department of RadiotherapyCHU la TimoneMarseilleFrance
  3. 3.Dosimetry LaboratoryCOGEMA, Etablissement de Marcoule BP 170Bagnols-sur-Ceze CedexFrance
  4. 4.ENT DepartmentCHU la TimoneMarseilleFrance
  5. 5.Department of StatisticsCHU la TimoneMarseilleFrance

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