Correctionforreconstructed images wasthat the ring artifacts in theCartesian coordinateweretransformedinto thevertical line artifactsinthe polar coordinateand removedas sinogram correction．Thefirst methodis al(ind of image preprocessing． Anotherone belongs to imagepostprocessing．In mostcasescorrectionsare optimally applied to sinogramdata．The setof algorithms enable virtuallycompletering artifact removalfrom tomographic imagery withminimalto negligible contaminationofthe underlying data．

改进Canny算法的CT图像环形伪影校正.pdf

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