Dose reduction in CT while maintaining diagnostic confidence: Diagnostic reference levels at routine head, chest, and abdominal CT-IAEA-coordinated research project
Dose reduction in CT while maintaining diagnostic confidence: Diagnostic reference levels at routine head, chest, and abdominal CT-IAEA-coordinated research project
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DOI：
10.1148/radiol.2403050993
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发表时间：
2006-09-01
期刊：
影响因子：
19.7
通讯作者：
Prokop, Mathias
中科院分区：
文献类型：
--
作者：
Tsapaki, Virginia;Aldrich, John E.;Prokop, Mathias
目的：作为国际原子能机构研究协调项目的一部分，测量头部、胸部和腹部的计算机断层扫描(CT)的辐射剂量，并将其与诊断参考水平进行比较。材料和方法：所有参与机构的地方伦理委员会批准了研究方案。所有患者均获得书面知情同意。所有扫描机均为螺旋单层或多层螺旋CT系统。633例患者接受了头部、胸部和腹部的CT检查。收集的数据包括患者的身高、体重、性别和年龄；管子电压和管子电流时间产品设置；螺距；截面厚度；截面数量；加权或体积CT剂量指数；以及剂量长度乘积(DLP)。结果：平均体积剂量指数和DLP值均低于欧洲诊断参考水平：头部分别为39mGy544mGy圆)cm，胸部分别为9.3mGy348mGy(圆)cm，腹部分别为10.4mGy549mGy圆)cm。估计的有效剂量分别为1.2、5.9和8.2 mSv。结论：CT结果与诊断参考水平的比较显示需要修订，部分原因是较新的扫描仪改进了技术，有助于降低患者剂量。
Purpose: To measure radiation doses for computed tomography (CT) of the head, chest, and abdomen and compare them with the diagnostic reference levels, as part of the International Atomic Energy Agency Research coordination project.Materials and Methods: The local ethics committees of all participating institutions approved the study protocol. Written informed consent was obtained from all patients. All scanners were helical single-section or multi-detector row CT systems. Six hundred thirty-three patients undergoing head (n = 97), chest (n = 243), or abdominal (n = 293) CT were included. Collected data included patient height, weight, sex, and age; tube voltage and tube current-time product settings; pitch; section thickness; number of sections; weighted or volumetric CT dose index; and dose-length product (DLP). The effective dose was also estimated and served as collective dose estimation data.Results: Mean volumetric CT dose index and DLP values were below the European diagnostic reference levels: 39 mGy and 544 mGy (circle) cm, respectively, at head CT; 9.3 mGy and 348 mGy (circle) cm, respectively, at chest CT; and 10.4 mGy and 549 mGy (circle) cm, respectively, at abdominal CT. Estimated effective doses were 1.2, 5.9, and 8.2 mSv, respectively.Conclusion: Comparison of CT results with diagnostic reference levels revealed the need for revisions, partly because the newer scanners have improved technology that facilitates lower patient doses.