Effective dose from cone beam CT examinations in dentistry
Effective dose from cone beam CT examinations in dentistry
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DOI：
10.1259/bjr/31419627
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发表时间：
2009-01-01
影响因子：
2.6
通讯作者：
Thomas, D. W.
中科院分区：
文献类型：
--
作者：
Roberts, J. A.;Drage, N. A.;Thomas, D. W.
在英国，锥形束CT（CBCT）正在成为越来越多地用于牙科检查的成像模式。先前的研究几乎没有提供关于可以使用的视野（FOV）范围内的患者剂量的信息。因此，本研究的目的是计算在牙科进行的CBCT检查选择期间输送给患者的有效剂量。特别是，针对临床实践中常用的几种成像协议，对i-CAT CBCT扫描仪进行了研究。扫描包含热释光剂量计的Rando体模。使用1990年和最近批准的2007年国际辐射防护委员会推荐的组织加权因子，计算有效剂量。剂量（E（1990），E（2007））为：全FOV头部（92.8 mu Sv，206.2 mu Sv）;钳口13 cm扫描（39.5 mu Sv，133.9 mu Sv）; 6 cm高分辨率下颌骨（47.2 mu Sv，188.5 mu Sv）; 6 cm高分辨率上颌骨（18.5 μ Sv，93.3 μ Sv）; 6 cm标准下颌骨（23.9 μ Sv，96.2 μ Sv）; 6 cm标准上颌骨（9.7 μ Sv，58.9 μ Sv）。与传统CT相比，CBCT的剂量较低，但明显高于传统牙科X线摄影技术。
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 mu Sv, 206.2 mu Sv); 13 cm scan of the jaws (39.5 mu Sv, 133.9 mu Sv); 6 cm high-resolution mandible (47.2 mu Sv, 188.5 mu Sv); 6 cm high-resolution maxilla (18.5 mu Sv, 93.3 mu Sv); 6 cm standard mandible (23.9 mu Sv, 96.2 mu Sv); and 6 cm standard maxilla (9.7 mu Sv, 58.9 mu Sv). The doses from CBCT are low compared with conventional CT but significantly higher than conventional dental radiography techniques.