一种用于CT中空气比释动能长度乘积测量的直接方法，用于剂量显示校准的验证。
A direct method for air kerma-length product measurement in CT for verification of dose display calibrations.
作者信息
Merimaa Katja, Järvinen Hannu, Kortesniemi Mika, Karppinen Juhani
机构信息
Radiation and Nuclear Safety Authority (STUK), Laippatie 4, 00881 Helsinki, Finland.
出版信息
Radiat Prot Dosimetry. 2010 Aug;140(3):274-80. doi: 10.1093/rpd/ncq121. Epub 2010 Mar 31.
The dose display values of computed tomography (CT) devices are used for patient dose estimation and as a tool for optimisation. Therefore, the dose display value accuracy should be verified. In practice, this means doing measurements in the standard phantoms and comparing results with the dose display values. The traditional method for measuring CT dose enables measurements only for one axial rotation, and there has not been a method for measuring the dose of a complete helical scan sequence. In this work, a new method for a direct measurement of the dose of a complete helical sequence is developed and tested. Results show that this method is practical and that the accuracy of the modern CT devices seems to be at the sufficient level, so that the dose display values can be used for patient dose estimation.
计算机断层扫描（CT）设备的剂量显示值用于患者剂量估计，并作为优化工具。因此，应验证剂量显示值的准确性。在实际操作中，这意味着要在标准体模中进行测量，并将结果与剂量显示值进行比较。传统的CT剂量测量方法仅能对一次轴向旋转进行测量，尚无测量完整螺旋扫描序列剂量的方法。在这项工作中，开发并测试了一种直接测量完整螺旋序列剂量的新方法。结果表明，该方法切实可行，现代CT设备的准确性似乎处于足够水平，因此剂量显示值可用于患者剂量估计。
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