Schulze D, Heiland M, Thurmann H, Adam G
Department of Oral Radiology, University Hospital Hamburg-Eppendorf, Hamburg, Germany.
Dentomaxillofac Radiol. 2004 Mar;33(2):83-6. doi: 10.1259/dmfr/28403350.
Radiation doses were determined to balance risks against usefulness of the different modalities available for the imaging of the facial skeleton.
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 degrees ), 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.
Multislice CT showed the highest exposure values. Exposure levels of the CBCT systems 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.
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.
确定辐射剂量，以平衡面部骨骼成像可用的不同模态的风险与效用。
使用配备氟化锂热释光剂量计（TLD）的Alderson Rando体模，通过一组四张传统X线片（眼眶位、改良华氏位、曲面体层摄影、颅骨后前位0度）、两种不同的锥束计算机断层扫描（CBCT）（NewTom 9000和Siremobil Iso-C3D）以及多层计算机断层扫描（CT）模态（Somatom VolumeZoom和Somatom Sensation 16）进行照射。对位于原射线束内的14个明确解剖部位的TLD以及对应甲状腺的TLD进行评估。
多层CT显示出最高的照射值。CBCT系统的照射水平介于CT和传统X线摄影之间。当使用适配的检查方案时，16层CT的剂量测量显示出与4层系统几乎相同的辐射暴露。
应根据所提供的剂量、所需的图像质量和信息以及临床情况来选择最合适的成像模态。
