title: An opposite view data replacement approach for reducing artifacts due to metallic dental objects.
abstract: OBJECTIVE
  To present a conceptually new method for metal artifact reduction (MAR) that can be used on patients with multiple objects within the scan plane that are also of small sized along the longitudinal (scanning) direction, such as dental fillings.
  
  
  METHODS
  The proposed algorithm, named opposite view replacement, achieves MAR by first detecting the projection data affected by metal objects and then replacing the affected projections by the corresponding opposite view projections, which are not affected by metal objects. The authors also applied a fading process to avoid producing any discontinuities in the boundary of the affected projection areas in the sinogram. A skull phantom with and without a variety of dental metal inserts was made to extract the performance metric of the algorithm. A head and neck case, typical of IMRT planning, was also tested.
  
  
  RESULTS
  The reconstructed CT images based on this new replacement scheme show a significant improvement in image quality for patients with metallic dental objects compared to the MAR algorithms based on the interpolation scheme. For the phantom, the authors showed that the artifact reduction algorithm can efficiently recover the CT numbers in the area next to the metallic objects.
  
  
  CONCLUSIONS
  The authors presented a new and efficient method for artifact reduction due to multiple small metallic objects. The obtained results from phantoms and clinical cases fully validate the proposed approach.
authors.affiliation: Department of Electrical Engineering, School of Engineering, Shiraz University, Shiraz 7134851154, Iran.
authors.forename: Mehran
authors.initials: M
authors.lastname: Yazdi
authors.forename: Meghdad Asadi
authors.initials: MA
authors.lastname: Lari
authors.forename: Gaston
authors.initials: G
authors.lastname: Bernier
authors.forename: Luc
authors.initials: L
authors.lastname: Beaulieu
mesh_terms: D000465:Algorithms; D016477:Artifacts; D017266:Dental Prosthesis; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008670:Metals; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D008670:Metals