Ring artifact is the major factor that seriously influence quality of computed tomography(CT)image reconstruction,especially in testing large-scale *** remove ring artifact quickly and efficiently,a kind of ring artif...
详细信息
Ring artifact is the major factor that seriously influence quality of computed tomography(CT)image reconstruction,especially in testing large-scale *** remove ring artifact quickly and efficiently,a kind of ring artifact correction method is improved based on the post-processing CT image reconstruction in this *** first,transform the CT image from the rectangular coordinates into polar ***,design multidimensional filter to filter the image and calculate the mean and variance of each filtered pixel in polar *** location of artifact point is determined by the double *** is the comparison of calculated variance and variance threshold,and another is the comparison of pixel value and pixel value ***,process the artifact points in a reasonable manner and do details remain to CT image in *** last,convert corrected polar image into rectangular *** actual experiment shows that compared with the original method,improved method can better correct the ring artifacts and keep the image details for CT *** is a kind of practical ring artifact correction methods for subsequent processing and quantitative analysis.
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