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目的探讨能够快速有效的去除CT环形伪影的改进方法,提高CT图像经过环形伪影方法处理后复原图像的精度,提高去除环形伪影的准确度,减小环形伪影算法对图像中有用信息的干扰。方法首先将CT图形(含环形伪影)用新的变换方式进行坐标变换,随后设计一个二维滤波器对图像进行滤波矫正,并在初次修复的基础上利用一维滤波器进行对二次伪影的再修复,最后利用新的变换方式还原图像。结果改进后的方法不仅能在经过环形伪影算法中的两次坐标变换后准确的还原出原始CT图像,而且能更为准确地矫正环形伪影,有效地消弱环形伪影矫正算法对图像有用信息的干扰。结论本研究设计的方法克服了原有方法的弊端,得到了较好的结果。
Objective To explore an improved method to remove CT ring artifacts quickly and effectively, to improve the accuracy of reconstructed images after ring artifact processing, to improve the accuracy of removing ring artifacts and to reduce the useful information of ring artifacts in the image Interference. Methods Firstly, CT images (including annular artifacts) were transformed by using a new transformation method. Then a 2D filter was designed to correct the image. On the basis of the first restoration, a one-dimensional filter Shadow and then repair, and finally use the new transformation to restore the image. Results The improved method not only can restore the original CT image accurately after the two coordinate transformations in the ring artifact algorithm, but also can correct the ring artifact more accurately and effectively weaken the effect of the ring artifact correction algorithm on the image Interference with useful information. Conclusion The method designed in this study overcomes the drawbacks of the original method and achieves better results.