Reduction of dental metallic artefacts in CT: value of a newly developed algorithm for metal artefact reduction (O-MAR)

Clin Radiol. 2014 Jan;69(1):e11-6. doi: 10.1016/j.crad.2013.08.008. Epub 2013 Oct 22.


Aim: To evaluate the image quality of O-MAR (Metal Artifact Reduction for Orthopedic Implants) for dental metal artefact reduction.

Materials and methods: This prospective study received institutional review board approval and written informed consent was obtained. Thirty patients who had dental implants or dental fillings were included in this study. Computed tomography (CT) images were obtained through the oral cavity and neck during the portal venous phase. The system reconstructed the O-MAR-processed images in addition to the uncorrected images. CT attenuation and image noise of the soft tissue of the oral cavity were compared between the O-MAR and the uncorrected images. Qualitative analysis was undertaken between the two image groups.

Results: The image noise of the O-MAR images was significantly lower than that of the uncorrected images (p < 0.01). O-MAR offered plausible attenuations of soft tissue compared with non-O-MAR. Better qualitative scores were obtained in the streaking artefacts and the degree of depiction of the oral cavity with O-MAR compared with non-O-MAR.

Conclusion: O-MAR enables the depiction of structures in areas in which this was not previously possible due to dental metallic artefacts in qualitative image analysis. O-MAR images may have a supplementary role in addition to uncorrected images in oral diagnosis.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Algorithms*
  • Artifacts*
  • Contrast Media
  • Dental Implants*
  • Dental Restoration, Permanent*
  • Female
  • Humans
  • Male
  • Metals
  • Middle Aged
  • Prospective Studies
  • Tomography, X-Ray Computed / methods*


  • Contrast Media
  • Dental Implants
  • Metals