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首页> 外文期刊>Journal of applied clinical medical physics / >Effect of fluoroscopic X‐ray beam spectrum on air‐kerma measurement accuracy: implications for establishing correction coefficients on interventional fluoroscopes with KAP meters
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Effect of fluoroscopic X‐ray beam spectrum on air‐kerma measurement accuracy: implications for establishing correction coefficients on interventional fluoroscopes with KAP meters

机译：荧光X射线束光谱对气生比测量准确性的影响：使用KAP计在介入荧光镜上建立校正系数的意义

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The first goal of this study was to investigate the accuracy of the displayed reference plane air kerma ( K a , r ) or air kerma-area product ( P k , a ) over a broad spectrum of X-ray beam qualities on clinically used interventional fluoroscopes incorporating air kerma-area product meters (KAP meters) to measure X-ray output. The second goal was to investigate the accuracy of a correction coefficient (CC) determined at a single beam quality and applied to the measured K a , r over a broad spectrum of beam qualities. Eleven state-of-the-art interventional fluoroscopes were evaluated, consisting of eight Siemens Artis zee and Artis Q systems and three Philips Allura FD systems. A separate calibrated 60 cc ionization chamber (external chamber) was used to determine the accuracy of the KAP meter over a broad range of clinically used beam qualities. For typical adult beam qualities, applying a single CC determined at 100 kVp with copper (Cu) in the beam resulted in a deviation of 5 % due to beam quality variation. This result indicates that applying a CC determined using The American Association of Physicists in Medicine Task Group 190 protocol or a similar protocol provides very good accuracy as compared to the allowed ± 35 % deviation of the KAP meter in this limited beam quality range. For interventional fluoroscopes dedicated to or routinely used to perform pediatric interventions, using a CC established with a low kVp ( ～ 55 ? 60 kVp ) and large amount of Cu filtration ( ～ 0.6 ? 0.9 mm ) may result in greater accuracy as compared to using the 100 kVp values. KAP meter responses indicate that fluoroscope vendors are likely normalizing or otherwise influencing the KAP meter output data. Although this may provide improved accuracy in some instances, there is the potential for large discrete errors to occur, and these errors may be difficult to identify.PACS number(s): 87.59.C-, 87.59.cf, 87.53.Bn
机译：这项研究的第一个目标是在临床使用的介入治疗方法上，研究显示的参考平面空气比释动能（K a，r）或空气比释动能面积乘积（P k，a）在广泛的X射线束质量上的准确性。荧光镜结合了空气比释动能面积计（KAP计）来测量X射线输出。第二个目标是研究在单个光束质量下确定的校正系数（CC）的准确性，并将其应用于在宽范围光束质量范围内测得的K a，r。对11台最先进的介入荧光镜进行了评估，其中包括8台Siemens Artis zee和Artis Q系统以及3台Philips Allura FD系统。使用一个单独的经过校准的60 cc电离室（外部室）来确定KAP测量仪在广泛的临床使用的光束质量范围内的精度。对于典型的成人光束质量，由于光束质量变化，在光束中以铜（Cu）施加在100 kVp下确定的单个CC会导致5％的偏差。该结果表明，与在限制的光束质量范围内KAP测量仪允许的±35％的偏差相比，应用通过美国医学物理学会任务组190协议或类似协议确定的CC可提供非常好的准确性。对于专用于或常规用于进行儿科干预的介入荧光检查镜，与使用ccp相比，使用低kVp（〜55〜60 kVp）和大量Cu过滤（〜0.6〜0.9 mm）建立的CC可能会导致更高的准确性。 100 kVp值。 KAP仪表的响应表明荧光镜供应商可能正在规范或影响KAP仪表的输出数据。尽管在某些情况下可以提供更高的准确性，但可能会出现较大的离散错误，并且可能难以识别这些错误。PACS编号：87.59.C-，87.59.cf，87.53.Bn

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