PERFORMANCE EVALUATION OF DIAGNOSTIC RADIOLOGY DOSIMETERS IN CLINICAL AND CALIBRATION X-RAY BEAMS
PERFORMANCE EVALUATION OF DIAGNOSTIC RADIOLOGY DOSIMETERS IN CLINICAL AND CALIBRATION X-RAY BEAMS
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DOI：
10.1097/hp.0b013e3181d18d45
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发表时间：
2010-05-01
期刊：
影响因子：
2.2
通讯作者：
Manetou, Aggeliki
中科院分区：
文献类型：
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作者：
Hourdakis, Costantine John;Boziari, Argyro;Manetou, Aggeliki
诊断放射剂量计应符合国际电工委员会（IEC）61674标准，以便进行足够准确和可靠的测量。剂量计的校准是在参考条件下进行的。然而，在大多数情况下，剂量计用于非参考条件下的临床测量。在参考校准和临床非参考条件下测试了六种商业诊断放射剂量计在剂量测量准确度方面的性能。结果表明，所有受试剂量计的变化限值均在+/- 5% IEC限值范围内。根据探测器的物理和操作特性，剂量计响应值的能量依赖性从-4.7%到+4.2%不等。为了解决响应的这种变化，建议至少在三个辐射质量（RQR 3，RQR 5和RQR 9）进行校准。不同的辐射条件，如空气比释动能率，X射线管设计，X射线系统，和剂量计的操作模式影响剂量计的响应小于3%。符合IEC标准并根据其规范运行的剂量计可用于典型的临床辐照条件，仅考虑响应的能量依赖性校正。在这种情况下，剂量准确度的误差预计小于3%。健康物理98（5）：704-716; 2010
Diagnostic radiology dosimeters should comply with International Electrotechnical Commission (IEC) 61674 standard in order to perform measurements with sufficient accuracy and reliability. The calibration of a dosimeter is performed under, and pertains to, reference conditions. However, in most cases, dosimeters are used for clinical measurements under non-reference conditions. The performance, in terms of accuracy of dose measurements, of six commercial diagnostic radiology dosimeters was tested at reference calibration and at clinical non-reference conditions. The results showed that all dosimeters being tested exhibited limits of variation within the +/- 5% IEC limits. Depending on the detector's physical and operational properties, the dosimeters' energy dependence of response values varied from -4.7% to +4.2%. To address this variation of response, calibration at three radiation qualities (RQR 3, RQR 5, and RQR 9), at least, is recommended. Different irradiation conditions such as air kerma rate, x-ray tube design, x-ray system, and dosimeter operational modes affect the dosimeters' response by less than 3%. A dosimeter that complies with IEC standards and operates according to its specifications could be used at typical clinical irradiation conditions taking into account only corrections for the energy dependence of response. In this case, the error in dose accuracy is expected to be less than 3%. Health Phys. 98(5): 704-716; 2010