METHOD AND APPARATUS FOR REDUCING ARTIFACTS IN COMPUTED TOMOGRAPHY IMAGE RECONSTRUCTION

摘要

The present invention provides a method and apparatus for reducing artifacts in CT image reconstruction. The method comprises obtaining an original reconstructed image and an original sinogram and determining a proportion of metal pixels in the original reconstructed image. If the proportion is greater than a first threshold value, then generating an expanded metal template based on the original reconstructed image, generating a metal-free, metal artifact reduced (MAR) image based on the expanded metal template and the original sinogram, and generating a final image based on the expanded metal template and the metal-free, MAR image. However, if the proportion of metal pixels is less than a second threshold value, then generating an expanded metal template based on the original reconstructed image, generating a metal-free, metal artifact reduced image based on a treatment, and generating a final image based on the expanded metal template and the metal-free, MAR image.

主权项

1. A method for reducing artifacts in computed tomography (CT) image reconstruction, comprising:
obtaining an original reconstructed image and an original sinogram; and determining a proportion of metal pixels in the original reconstructed image;
wherein, if the proportion of metal pixels is greater than a first threshold value, then the method further comprises:
generating an expanded metal template based on the original reconstructed image, wherein the expanded metal template includes a two-dimensional or three-dimensional expansion for different pixels,generating a metal-free, metal artifact reduced (MAR) image based on the expanded metal template and the original sinogram, andgenerating a final image based on the expanded metal template and the metal-free, MAR image; andwherein, if the proportion of metal pixels is less than a second threshold value, then the method further comprises:
generating an expanded metal template based on the original reconstructed mage,generating a metal-free, MAR image based on a treatment including weighting of the expanded metal template and the original sinogram, andgenerating a final image based on the expanded metal template and the metal-free, MAR image.