Suppression of metal artifacts in CT using a reconstruction procedure that combines MAP and projection completion

IEEE Trans Med Imaging. 2009 Feb;28(2):250-60. doi: 10.1109/TMI.2008.929103.


Metal implants such as hip prostheses and dental fillings produce streak and star artifacts in the reconstructed computed tomography (CT) images. Due to these artifacts, the CT image may not be diagnostically usable. A new reconstruction procedure is proposed that reduces the streak artifacts and that might improve the diagnostic value of the CT images. The procedure starts with a maximum a posteriori (MAP) reconstruction using an iterative reconstruction algorithm and a multimodal prior. This produces an artifact-free constrained image. This constrained image is the basis for an image-based projection completion procedure. The algorithm was validated on simulations, phantom and patient data, and compared with other metal artifact reduction algorithms.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms
  • Artifacts*
  • Computer Simulation
  • Dental Restoration, Permanent
  • Hip Prosthesis
  • Humans
  • Image Processing, Computer-Assisted*
  • Markov Chains
  • Metals*
  • Phantoms, Imaging
  • Prostheses and Implants*
  • Reproducibility of Results
  • Tomography, X-Ray Computed / methods*


  • Metals