title: The Effect of Metal Artifact Reduction at Different Calibrated and Display Field of Views in Computed Tomography.
abstract: The purpose of this study was to investigate the effects of the metal artifact reduction using single energy metal artifact reduction (SEMAR) with a prosthetic hip joint in different field of view (FOV).
  
  
  
  A prosthetic hip joint was arranged at the center of the phantom. The phantom images were scanned by changing calibrated-FOV (C-FOV) of 240, 320, 400, and 500 mm. Those images were reconstructed by changing the display-FOV (D-FOV) of 120, 180, 240, and 320 mm. The metal artifact reduction with the SEMAR was evaluated by calculating the artifact index (AI) and its decrease ratio.
  
  
  
  The AI of C-FOV (500 mm) and D-FOV (120, 180, 240, or 320 mm) were 15.8, 15.8, 15.7, and 14.4 with SEMAR. For changed C-FOV, the AI of C-FOV (240 mm) was significantly higher than any other C-FOVs. The AI of C-FOV (240 mm) was 29.8-30.0 and that of the other C-FOV were 12.4-15.8 with SEMAR. In addition, the decrease ratio of AI was 52.2-54.1% for C-FOV (240 mm) and 58.9-73.2% for the other C-FOVs.
  
  
  
  Although the SEMAR decreased the metal artifact, the effect of reducing the metal artifact was affected by C-FOV.
authors.affiliation: Department of Radiology, Kurashiki Central Hospital.
authors.forename: Kunihito
authors.initials: K
authors.lastname: Tsuboi
authors.forename: Masaaki
authors.initials: M
authors.lastname: Fukunaga
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yamamoto
mesh_terms: D016477:Artifacts; D002138:Calibration; D008670:Metals; D019047:Phantoms, Imaging; D019736:Prostheses and Implants; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D008670:Metals