According to the concept of linear-fitting correction, the correction factors for correcting the test-piece image are obtained by reference images and their corresponding means captured at fixed tube voltage and different tube current.

• 此方法基于线性拟合校正的思想，在一定管电压下，改变管电流采集一组探测器基准图像，利用这组图像与其相应均值进行拟合，再把拟合系数作为校正因子对试件成像进行校正。