Beam Hardening Correction Algorithm Based on Material Attenuation in Computed Tomography
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摘要: 针对工业CT数据获取过程中X射线的多能导致的重建图像产生伪影和降质的问题, 从射线硬化的物理性质出发, 将多色投影数据通过矩阵运算转化为单色投影数据。利用数字图像趋势项产生及消除的基本原理, 结合小波滤波方法, 提出了一种不需要提前CT扫描和设计的综合校正方法。该方法简单、快速, 是通用的多色投影校正方法, 并且它不受扫描物体组成和扫描条件的限制。通过对受硬化影响的实际图像进行硬化校正, 表明该方法不需要先验知识且校正效果良好, 具有通用性。Abstract: Aiming at the artifact and image degradation of reconstructed image produced by the polychromatic spectrum of X-ray in the CT projection, a new correction method was put forward. The correction algorithm using physical property was deduced and the polychromatic projection was transformed to a monochromatic projection by matrix operation. Based on the producing and removing of the image trend, a integrative correction method combing with wavelet filtering and correction factor was presented, which need not CT scanning and design in advance, which was simple, fast, universal, and independent of the constitute of workpiece and scanning condition. The hardening correction method was used in practical reconstructive images influenced by hardening, and the results showed that the better effect could be obtained, without prior knowledge and the method was of universality.
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