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Dosimetry of the cone beam computed tomography Veraviewepocs 3D compared with the 3D Accuitomo in different fields of view

¹Department of Dentomaxillofacial Radiology, Dental School, University of Leipzig, Germany; ²Centre for Radiotherapy and Radio Oncology, University of Leipzig, Germany; ³Department of Stomatologic Sciences, Federal University of Goias School of Dentistry, Goias, Brazil

*Correspondence to: Maria Alves Garcia Silva, Rua 13, N0 778 – Setor Marista, 74150–140 Goiania, Goias, Brazil. E-mail: magss{at}odonto.ufg.br

Received 21 April 2007; revised 3 September 2007; accepted 9 September 2007

Objectives: This study compares tissue-absorbed and effective doses of the cone beam CT (CBCT) units, the Veraviewepocs 3D and the 3D Accuitomo, in different protocols.

Methods: The absorbed organ doses were measured using an anthropomorphic phantom loaded with thermoluminescent dosemeters (TLDs) in 16 sensitive organ sites. Both CBCT units were deployed with different fields of view (FOVs): 3D Accuitomo using two protocols (anterior 4x4 cm scan and anterior 6x6 cm scan) and Veraviewepocs 3D using three protocols (anterior 4x4 cm scan, anterior 8x4 cm scan and panoramic + anterior 4x4 cm). Equivalent and effective doses were then calculated, the latter based on the International Commission on Radiological Protection's (ICRP) 2005 recommendations.

Results: The lowest effective dose was observed for the 3D Accuitomo 4x4 cm (20.02 µSv), the highest for the 3D Accuitomo 6x6 cm (43.27 µSv). The effective dose recorded for Veraviewepocs 3D was 39.92 µSv for the 8x4 cm scan, 30.92 µSv for the 4x4 cm scan and 29.78 µSv for the panoramic + 4x4 cm scan protocol.

Conclusions: The radiation doses delivered by both machines were in comparable ranges when using 4x4 cm FOV. A smaller FOV should be used for dental images, whereas a larger FOV should be restricted to cases in which a wider view is required.

Keywords: thermoluminescent dosimetry; tomography, X-ray computed; radiography, panoramic; cone beam computed tomography