Hypothetical mortality risk associated with spiral computed tomography of the maxilla and mandible

European Journal of Oral Sciences - Tập 104 Số 5-6 - Trang 503-510 - 1996
Karl Dula1,2, R. Mini3, P.F. van der Stelt1, Jörg Thomas Lambrecht4,2, Paul Schneeberger3, Daniel Buser2
1Department of Oral Radiology, School of Dentistry, Academic Center for Dentistry Amsterdam, Amsterdam, The Netherlands
2Department of Oral Surgery, Section of Dental Radiology and Diagnostic Stomatology, School of Dental Medicine, University of Berne, Berne, Switzerland
3Department of Radiooncology, Division of Medical Radiation Physics, School of Medicine, University of Berne, Berne, Switzerland
4Department for Oral Surgery, Oral Radiology and Oral Medicine, School of Dentistry, University of Basle, Basle, Switzerland

Tóm tắt

In the present study, dose measurements have been conducted following examination of the maxilla and mandible with spiral computed tomography (CT). The measurements were carried out with 2 phantoms, a head and neck phantom and a full body phantom. The analysis of applied thermoluminescent dosimeters yielded radiation doses for organs and tissues in the head and neck region between 0.6 and 16.7 mGy when 40 axial slices and 120 kV/165 mAs were used as exposure parameters. The effective dose was calculated as 0.58 and 0.48 mSv in the maxilla and mandible, respectively. Tested methods for dose reduction showed a significant decrease of radiation dose from 40 to 65%. Based on these results, the mortality risk was estimated according to calculation models recommended by the Committee on the Biological Effects of Ionizing Radiations and by the International Commission on Radiological Protection. Both models resulted in similar values. The mortality risk ranges from 46.2×10‐6 for 20‐year‐old men to 11.2×10−6 for 65‐year‐old women. Using 2 methods of dose reduction, the mortality risk decreased by ∼ 50 to 60% to 19.1×10−6 for 20‐year‐old men and 5.5×10−6 for 65‐year‐old women. It can be concluded that a CT scan of the maxillofacial complex causes a considerable radiation dose when compared with conventional radiographic examinations. Therefore, a careful indication for this imaging technique and dose reduction methods should be considered in daily practice.

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European Journal of Oral Sciences

Tập 104 Số 5-6

503-510

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