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Effective dose from cone beam CT examinations in dentistry

¹ Department of Medical Physics, Velindre Cancer Centre, Velindre NHS Trust, ² Department of Dental Radiology, University Dental Hospital, Cardiff and Vale NHS Trust, Cardiff, ³ Department of Dental Radiological Imaging, Guy's Hospital, Guy's Tower, London, UK

Correspondence: J A Roberts, Department of Medical Physics, Velindre Cancer Centre, Velindre NHS Trust, Cardiff, UK. E-mail: James.Roberts{at}velindre-tr.wales.nhs.uk

Cone beam CT (CBCT) is becoming an increasingly utilized imaging modality for dental examinations in the UK. Previous studies have presented little information on patient dose for the range of fields of view (FOVs) that can be utilized. The purpose of the study was therefore to calculate the effective dose delivered to the patient during a selection of CBCT examinations performed in dentistry. In particular, the i-CAT CBCT scanner was investigated for several imaging protocols commonly used in clinical practice. A Rando phantom containing thermoluminescent dosemeters was scanned. Using both the 1990 and recently approved 2007 International Commission on Radiological Protection recommended tissue weighting factors, effective doses were calculated. The doses (E₁₉₉₀, E₂₀₀₇) were: full FOV head (92.8 µSv, 206.2 µSv); 13 cm scan of the jaws (39.5 µSv, 133.9 µSv); 6 cm high-resolution mandible (47.2 µSv, 188.5 µSv); 6 cm high-resolution maxilla (18.5 µSv, 93.3 µSv); 6 cm standard mandible (23.9 µSv, 96.2 µSv); and 6 cm standard maxilla (9.7 µSv, 58.9 µSv). The doses from CBCT are low compared with conventional CT but significantly higher than conventional dental radiography techniques.

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