Nicol Ruth M, Wayte Sarah C, Bridges Andrew J, Koller Christopher J
1 Department of Clinical Physics and Bio-Engineering, Arden Cancer Centre, University Hospitals Coventry and Warwickshire NHS Trust, Coventry, UK.
2 Radiation Protection, Medical Physics Department, MP 29, Southampton General Hospital, Southampton, UK.
Br J Radiol. 2016;89(1057):20150617. doi: 10.1259/bjr.20150617. Epub 2015 Nov 5.
To assess the use of a commercial dose management system (GE DoseWatch; GEMS, Milwaukee, WI) for CT dose management for six common CT examinations.
Data were acquired over several months using GE DoseWatch for six common CT examinations on three CT scanners. The dose length product (DLP) was taken as the dose indicator. The data were analysed using four different filtering methods: study description, the National Interim Clinical Imaging Procedure code, protocol name and a more detailed filtering method (the reference data set). The filtering methods were compared using an analysis of variance and multiple comparison technique. The different scanners were compared using the reference data set.
It was found that integrating DoseWatch with the radiology information system provided improved results compared with using the study description. Filtering by study description was found to be a poor indicator of the mean dose for all three scanners and consistently overestimated (p < 0.05) the head and thorax-abdo-pelvis mean DLP values, despite the large sample sizes. Filtering by the National Interim Clinical Imaging Procedure code or protocol name produced mean DLPs which were not statistically different from the reference data. The scanner intercomparison showed some significant differences between the scanners, usually due to different tube current modulation settings.
The use of a commercial dose monitoring system provided fast and efficient filtering of substantial amounts of data. The filtering method affected the mean DLP value despite large sample sizes.
Dose management systems are relatively new in the UK, and this article shares knowledge on the use of one system.
评估一种商用剂量管理系统（GE DoseWatch；GEMS，密尔沃基，威斯康星州）在六种常见CT检查的CT剂量管理中的应用。
在几个月的时间里，使用GE DoseWatch在三台CT扫描仪上对六种常见CT检查采集数据。剂量长度乘积（DLP）被用作剂量指标。使用四种不同的过滤方法分析数据：研究描述、国家临时临床成像程序代码、协议名称和一种更详细的过滤方法（参考数据集）。使用方差分析和多重比较技术比较过滤方法。使用参考数据集比较不同的扫描仪。
发现与使用研究描述相比，将DoseWatch与放射学信息系统集成可提供更好的结果。发现按研究描述进行过滤对于所有三台扫描仪来说都是平均剂量的较差指标，尽管样本量很大，但始终高估（p < 0.05）头部和胸腹部 - 骨盆的平均DLP值。按国家临时临床成像程序代码或协议名称进行过滤产生的平均DLP与参考数据无统计学差异。扫描仪间比较显示扫描仪之间存在一些显著差异，通常是由于不同的管电流调制设置。
使用商用剂量监测系统可对大量数据进行快速有效的过滤。尽管样本量很大，但过滤方法仍会影响平均DLP值。
剂量管理系统在英国相对较新，本文分享了关于一种系统应用的知识。
