Effective dose from cone beam CT examinations in dentistry

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.

Characterization of MOSFET dosimeters for low‐dose measurements in maxillofacial anthropomorphic phantoms

“…To date, most studies concerning effective dose assessment have used thermoluminescent dosimeters (TLD) in combination with anthropomorphic phantoms 2 , 3 , 4 , 5 , 6 , 7 . The low‐dose limit of TLDs when using single exposure (0.3 mGy) 8 , 9 has been considered adequate in most applications and has, therefore, been used as the reference low‐dose limit in MOSFET uncertainty assessment in this study.…”

The Image Gently in Dentistry campaign: promotion of responsible use of maxillofacial radiology in dentistry for children

“…12 Marked dose reductions can be achieved in CBCT examinations by reducing the field of view to the region of interest. 31,32 4. Use thyroid collars.…”

Acurácia de medidas lineares em softwares de planejamento de implantes sobre imagens de mandibulas atróficas obtidas por tomografias computadorizadas de feixe cônico com diferentes protocolos de aquisição

“…A alta confiabilidade no volume total das medidas lineares de imagens obtidas por TCFC no presente estudo (Correlação Intra Classe-ICC=0,962) como já citado, se assemelha com estudos de imagens de TCFC comparadas a TC helicoidal (Mozzo et al, 1998;Ziegler et al, 2002;Suomalainen et al, 2008;Roberts et al, 2009;Liang et al, 2010;Primo et al, 2012;Naser, Mehr, 2013 como referência (Ballrick et al, 2008;Baumgaertel et al, 2009;Kamburoğlu et al, 2009;Tomasi et al, 2011;Al-Ekrish, Ekran 2011;Kim G et al, 2012;Engelbrecht et al, 2013;Naser;Mehr, 2013;Kosalagood et al, 2014), sedimentando a TCFC como exame de alta reprodutibilidade, podendo assim ser indicado para diagnóstico e planejamento para as diversas áreas da odontologia.…”

“…Entre suas vantagens temos a diminuição no tempo do exame, a alta precisão, bem como a possibilidade de reconstruções tridimensionais, favorencendo a visualização anatômica e patológica do complexo maxila-mandíbula e ainda contribuindo para precisão de intervenções cirúrgicas, mas sem dúvida sendo a diminuição da dose de radiação um dos maiores benefícios ao paciente (Roberts et al, 2009). …”