高密度金属包装液体的双能CT检测方法

Dual-energy CT Inspection Method for Liquid in High Density Metal Container

基于投影分解的双能CT液体探测方法能有效抑制射束硬化效应的影响,但对于由高密度金属容器包装的液体检测,原子序数的计算误差较大。本文在双能分解预处理CT重建框架下,通过数据分析,研究了一种针对高密度金属圆柱形容器包装液体的电子密度和有效原子序数计算结果的线性校正方法。该方法可大幅提高原子序数求解精度,且适用于多瓶液体同时检测。实验数据验证了该方法的有效性。

The beam hardening can be depressed in liquid detection by dual-energy CT based on projection decomposition.However,the calculation error of effective atomic number is still very obvious if the container’s material is high density metal.Under the frame of dual-energy CT pre-reconstruction,a linear correction method for the calculation result of electric density and effective atomic number of the liquid in high density cylindrical containers was proposed according to experimental data analysis in this paper.The presented method can improve the calculation accuracy of effective atomic number substantially.And this method is also suitable for the situation that several containers are inspected together.The experimental results indicate that the method is valid.