Niiniviita Hannele, Kiljunen Timo, Huuskonen Minna, Teperi Simo, Kulmala Jarmo
Department of Medical Physics, Turku University Hospital and University of Turku, Kiinamyllynkatu 4-8, 20520, Turku, Finland.
Medical Imaging Center of Southwest Finland, Kiinamyllynkatu 4-8, 20521, Turku, Finland.
Emerg Radiol. 2018 Apr;25(2):153-159. doi: 10.1007/s10140-017-1571-x. Epub 2017 Dec 16.
As the number of pediatric computed tomography (CT) imaging is increasing, there is a need for real-time radiation dose monitoring and evaluation of the imaging protocols. The aim of this study was to present the imaging data, patient doses, and observations of pediatric and young adult trauma-and routine head CT and cervical spine CT collected by a dose monitoring software.
Patient age, study date, imaging parameters, and patient dose as volume CT dose index (CTDI) and dose length product (DLP) were collected from two emergency departments' CT scanners for 2-year period. The patients were divided into four age groups (0-5, 6-10, 11-15, and 16-20 years) for statistical analysis and effective dose determination. The 75th percentile doses were evaluated to be used as local diagnostic reference levels (DRLs).
Six hundred fifteen trauma head, 318 routine head, and 592 trauma cervical spine CT studies were assessed. All mean CTDI values were statistically lower in hospital B (40.3 ± 12.3, 30.03 ± 11.1, and 6.9 ± 3.1 mGy, respectively) than in hospital A (53.0 ± 12.9, 43.2 ± 8.7, and 18.3 ± 7.3 mGy, respectively). Statistically significant differences were observed on scanning length between hospitals and between CTDI values when protocol was updated. The 75th percentiles of trauma cervical spine in hospital B can be used as local DRL. Non-optimized protocols were also revealed in hospital A.
Dose monitoring software offers a valuable tool for evaluating the imaging practices and finding non-optimized protocols.
随着儿科计算机断层扫描（CT）成像数量的增加，需要对成像协议进行实时辐射剂量监测和评估。本研究的目的是展示通过剂量监测软件收集的儿科和青年成人创伤及常规头部CT和颈椎CT的成像数据、患者剂量及观察结果。
在两年时间里，从两个急诊科的CT扫描仪收集患者年龄、研究日期、成像参数以及作为容积CT剂量指数（CTDI）和剂量长度乘积（DLP）的患者剂量。将患者分为四个年龄组（0 - 5岁、6 - 10岁、11 - 15岁和16 - 20岁）进行统计分析和有效剂量测定。评估第75百分位数剂量以用作当地诊断参考水平（DRL）。
评估了615例创伤头部、318例常规头部和592例创伤颈椎CT研究。医院B的所有平均CTDI值（分别为40.3±12.3、30.03±11.1和6.9±3.1 mGy）在统计学上均低于医院A（分别为53.0±12.9、43.2±8.7和18.3±7.3 mGy）。在协议更新时，观察到医院之间以及CTDI值之间在扫描长度上存在统计学显著差异。医院B中创伤颈椎的第75百分位数可作为当地DRL。医院A也发现了未优化的协议。
剂量监测软件为评估成像实践和发现未优化的协议提供了一个有价值的工具。
