Larsson J P, Persliden J, Carlsson G A
Department of Radiation Physics, Faculty of Health Sciences, Linköping University, Sweden.
Phys Med Biol. 1998 Mar;43(3):599-607. doi: 10.1088/0031-9155/43/3/011.
Calibrations of kerma-area product meters (KAP meters) are often performed using simplified methods. The accuracy thus obtained can be insufficient, especially when the KAP meters are used for optimizing radiological procedures. The deviations between the best available calibration factor (k) and the simplified calibration factor (ks) were measured at different clinical x-ray installations. Depending on the type of x-ray installation and calibration method, the quotient ks/k ranged from 0.83 to 1.19, reflecting the error made in practice using these methods. A simple alternative calibration method based on comparison with a KAP meter calibrated by the best available method is described. Depending on tube potential and the stability of the electrometers, the uncertainty in the calibration factor derived with this method was between 3.8% and 5.6% (at 95% confidence level).
空气比释动能面积乘积仪（KAP仪）的校准通常采用简化方法。由此获得的准确性可能不足，尤其是当KAP仪用于优化放射学程序时。在不同的临床X射线设备上测量了最佳可用校准因子（k）与简化校准因子（ks）之间的偏差。根据X射线设备的类型和校准方法，ks/k的商在0.83至1.19之间，反映了使用这些方法在实际中产生的误差。描述了一种基于与采用最佳可用方法校准的KAP仪进行比较的简单替代校准方法。根据管电压和静电计的稳定性，用该方法得出的校准因子的不确定度在3.8%至5.6%之间（95%置信水平）。
