大型工业CT中X射线硬化校正的一种方案

A project of X-ray hardening correction in large ICT

介绍了大型工业CT的一种多色X射线硬化校正方法。该方法利用一个标准函数将多色投影值转化为单色投影值。定义了一些参数来证明该方法适用于大型工业CT的硬化校正,并对参数进行了优化。通过模拟实验,这种校正方法在不需要先验知识,使用单色重建算法的前提下,仍能大大减小CT重建图像的硬化伪像。

This paper presents a means of polychromatic X-ray beam hardening correction using a standard function to transform the polychromatic projection to monochromatic projection in large Industrial Computed Tomography(ICT). Some parameters were defined to verify the validity of hardening correction in large ICT and optimized. Simulated experiments were used to prove that without prior knowledge of the composition of the scanned object, the correction method using monochromatic reconstruction arithmetic could remove beam hardening artifact greatly.