工业CT散射校正方法的研究

Research of scatter correction on industry computed tomography

在工业 CT的扫描重建过程中 ,散射效应使得重建图像出现模糊 ,各点灰度值同实际物体的吸收系数之间出现偏差 ,需要进行校正。如果采用一般的卷积方法 ,则需要迭代多次才能收敛 ,所以在校正时间上不能达到要求。采用一种结合散射模型的 Ordered Subsets Convex方法对散射效果进行校正 。

In the scanning process of industry computed tomography, scatter blurs the reconstructed image. The grey values of pixels in the reconstructed image are away from what is true and such effect need to be corrected. If we use the conventional method of deconvolution, many steps of iteration are needed and the computing time is not satisfactory. This paper discusses a method combining Ordered Subsets Convex algorithm and scatter model to implement scatter correction and promising results are obtained in both speed and image quality.