A computerized tomography artifact correction method includes: receiving scanning data； reconstructing an image to be corrected and a reference image of the image to be corrected based on the scanning data； determining proportions of a first substance for pixels of the reference image； obtaining a base image of the first substance based on the proportions of the first substance； performing a projection of the base image of the first substance and the reference image to obtain a plurality of projection lines； for each of the plurality of projection lines, obtaining an equivalent length of the first substance corresponding to the projection line and selecting a hardening correction coefficient based on the equivalent length of the first substance corresponding to the projection line； and performing an artifact correction on the image to be corrected based on the hardening correction coefficients.
