National survey of doses from CT in the UK: 2003
National survey of doses from CT in the UK: 2003
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DOI：
10.1259/bjr/93277434
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发表时间：
2006-12-01
影响因子：
2.6
通讯作者：
Dunn, M.
中科院分区：
文献类型：
--
作者：
Shrimpton, P. C.;Hillier, M. C.;Dunn, M.
根据从英国四分之一以上的扫描仪（其中37%具有多层扫描能力）收到的数据，对2003年英国CT检查的患者剂量进行了审查。采用问卷调查的方式收集扫描细节，包括在每个扫描仪上为成人和儿童的12种常见CT检查建立的标准方案，以及个别患者的样本。该信息与已公布的扫描仪特异性CT剂量指数（CTDI）系数相结合，以估计每个扫描序列的标准剂量指数CTDIw和CTDIvol的值。了解每个扫描长度可以评估每次检查的剂量长度产物（DLP），然后从中估计有效剂量。与1991年英国之前的调查相比，CT中心之间在标准方案的剂量上仍然存在明显的差异。英国成年患者的平均剂量一般比1991年低50%，尽管多层（4+）（MSCT）的剂量相对于单层（SSCT）扫描仪略高。MSCT的CTDIvol值与2001年欧洲调查数据大致相似。这些剂量分布的第三个四分位数值被用来得出英国国家参考剂量，用于成人（SSCT和MSCT分别进行）和儿童的检查，作为促进患者保护的初始工具。该调查建立了PREDICT （CT患者辐射暴露和剂量）数据库，通过不断整理进一步的调查数据，将其作为监测CT剂量趋势的可持续国家资源。
A review of patient doses from CT examinations in the UK for 2003 has been conducted on the basis of data received from over a quarter of all UK scanners, of which 37% had multislice capability. Questionnaires were employed to collect scan details both for the standard protocols established at each scanner for 12 common types of CT examination on adults and children, and for samples of individual patients. This information was combined with published scanner-specific CT dose index (CTDI) coefficients to estimate values of the standard dose indices CTDIw and CTDIvol for each scan sequence. Knowledge of each scan length allowed assessment of the dose-length product (DLP) for each examiniation, from which effective doses were then estimated. When compared with a previous UK survey for 1991, wide variations were still apparent between CT centres in the doses for standard protocols. The mean UK doses for adult patients were in general lower by up to 50% than those for 1991, although doses were slightly higher for multislice (4+) (MSCT) relative to single slice (SSCT) scanners. Values of CTDIvol for MSCT were broadly similar to European survey data for 2001. The third quartile values of these dose distributions have been used to derive UK national reference doses for examinations on adults (separately for SSCT and MSCT) and children as initial tools for promoting patient protection. The survey has established the PREDICT (Patient Radiation Exposure and Dose in CT) database as a sustainable national resource for monitoring dose trends in CT through the ongoing collation of further survey data.