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Effective dose from cone beam CT examinations in dentistry

Roberts, J., Drage, Nicholas, Davies, J. and Thomas, David William 2009. Effective dose from cone beam CT examinations in dentistry. British Journal of Radiology 82 (973) , pp. 35-40. 10.1259/bjr/31419627

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Abstract

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 (E(1990), E(2007)) were: full FOV head (92.8 microSv, 206.2 microSv); 13 cm scan of the jaws (39.5 microSv, 133.9 microSv); 6 cm high-resolution mandible (47.2 microSv, 188.5 microSv); 6 cm high-resolution maxilla (18.5 microSv, 93.3 microSv); 6 cm standard mandible (23.9 microSv, 96.2 microSv); and 6 cm standard maxilla (9.7 microSv, 58.9 microSv). The doses from CBCT are low compared with conventional CT but significantly higher than conventional dental radiography techniques.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Systems Immunity Research Institute (SIURI)
Uncontrolled Keywords: cone-beam computed tomography/mt [methods]; head/ra [radiography]; humans; imaging, three-dimensional/mt [methods]; jaw/ra [radiography]; phantoms; imaging; radiation dosage; radiography; dental/mt [methods]; reproducibility of results; thermoluminescent dosimetry/mt [methods]
Additional Information: Br J Radiol
Publisher: British Institute of Radiology
ISSN: 0007-1285
Last Modified: 04 Jun 2017 03:03
URI: http://orca.cf.ac.uk/id/eprint/16040

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