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1 Department of Oral Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany; 2 Department of Oral and Maxillofacial Surgery, University Hospital Hamburg-Eppendorf, Hamburg, Germany; 3 Department of Radiation Therapy, University Hospital Hamburg-Eppendorf, Hamburg, Germany; 4 Department of Diagnostic and Interventional Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany
*Correspondence to: Dr Dirk Schulze, Department of Oral Radiology, University Hospital Hamburg-Eppendorf, Martinistr. 52, D- 20246 Hamburg, Germany; Email: dschulze{at}uke.uni-hamburg.de
Received 14 June 2003; revised 24 February 2004; accepted 24 February 2004
Objectives: Radiation doses were determined to balance risks against usefulness of the different modalities available for the imaging of the facial skeleton.
Methods: An Alderson Rando Phantom, armed with lithium fluoride thermoluminescent dosemeters (TLDs) was exposed using a set of four conventional radiographs (orbital view, modified Waters view, orthopantomography, skull posterior–anterior 0°), two different cone beam computed tomography (CBCT) (NewTom 9000 and Siremobil Iso-C3D), and multislice computed tomography (CT) modalities (Somatom VolumeZoom and Somatom Sensation 16). TLDs from 14 well defined anatomical sites lying within the primary beam as well as the TLD corresponding to the thyroid gland were evaluated.
Results: Multislice CT showed the highest exposure values. Exposure levels of the CBCT sytems lay between CT and conventional radiography. Dose measurement for the 16-slice CT revealed nearly the same radiation exposure as the 4-slice system when adapted examination protocols were used.
Conclusions: Selection of the most appropriate imaging modality should be performed in view of the delivered doses, required image quality and information and the clinical circumstances.
Keywords: radiation exposure; computed tomography; cone beam computed tomography; conventional radiography
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