Al-Okshi A, Lindh C, Salé H, Gunnarsson M, Rohlin M
1 Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden.
Br J Radiol. 2015 Jan;88(1045):20140658. doi: 10.1259/bjr.20140658.
To estimate effective dose of cone beam CT (CBCT) of the facial skeleton with focus on measurement methods and scanning protocols.
A systematic review, which adhered to the preferred reporting items for systematic reviews (PRISMA) Statement, of the literature up to April 2014 was conducted. Data sources included MEDLINE®, The Cochrane Library and Web of Science. A model was developed to underpin data extraction from 38 included studies.
Technical specifications of the CBCT units were insufficiently described. Heterogeneity in measurement methods and scanning protocols between studies made comparisons of effective doses of different CBCT units and scanning protocols difficult. Few studies related doses to image quality. Reported effective dose varied across studies, ranging between 9.7 and 197.0 μSv for field of views (FOVs) with height ≤5 cm, between 3.9 and 674.0 μSv for FOVs of heights 5.1-10.0 cm and between 8.8 and 1073.0 μSv for FOVs >10 cm. There was an inconsistency regarding reported effective dose of studies of the same CBCT unit with the same FOV dimensions.
The review reveals a need for studies on radiation dosages related to image quality. Reporting quality of future studies has to be improved to facilitate comparison of effective doses obtained from examinations with different CBCT units and scanning protocols. A model with minimum data set on important parameters based on this observation is proposed.
Data important when estimating effective dose were insufficiently reported in most studies. A model with minimum data based on this observation is proposed. Few studies related effective dose to image quality.
评估面部骨骼锥形束CT（CBCT）的有效剂量，重点关注测量方法和扫描方案。
对截至2014年4月的文献进行系统综述，该综述遵循系统评价和Meta分析的首选报告项目（PRISMA）声明。数据来源包括MEDLINE®、Cochrane图书馆和科学引文索引。开发了一个模型以支持从38项纳入研究中提取数据。
CBCT设备的技术规格描述不足。研究之间测量方法和扫描方案的异质性使得不同CBCT设备和扫描方案的有效剂量比较变得困难。很少有研究将剂量与图像质量相关联。不同研究报告的有效剂量各不相同，对于高度≤5 cm的视野（FOV），有效剂量在9.7至197.0 μSv之间；对于高度为5.1 - 10.0 cm的FOV，有效剂量在3.9至674.0 μSv之间；对于高度>10 cm的FOV，有效剂量在8.8至1073.0 μSv之间。对于具有相同FOV尺寸的同一CBCT设备的研究，报告的有效剂量存在不一致性。
该综述表明需要开展与图像质量相关的辐射剂量研究。必须提高未来研究的报告质量，以促进对不同CBCT设备和扫描方案检查所获有效剂量的比较。基于这一观察结果，提出了一个包含重要参数最小数据集的模型。
大多数研究中，估计有效剂量时重要的数据报告不足。基于这一观察结果提出了一个包含最小数据的模型。很少有研究将有效剂量与图像质量相关联。
