title: Reduction of dark-band-like metal artifacts caused by dental implant bodies using hypothetical monoenergetic imaging after dual-energy computed tomography.
abstract: OBJECTIVE
  The aim of this study was to evaluate the usefulness of hypothetical monoenergetic images after dual-energy computed tomography (DECT) for assessment of the bone encircling dental implant bodies.
  
  
  METHODS
  Seventy-two axial images of implantation sites clipped out from image data scanned using DECT in dual-energy mode were used. Subjective assessment on reduction of dark-band-like artifacts (R-DBAs) and diagnosability of adjacent bone condition (D-ABC) in 3 sets of DECT images-a fused image set (DE120) and 2 sets of hypothetical monoenergetic images (ME100, ME190)-was performed and the results were statistically analyzed.
  
  
  RESULTS
  With regards to R-DBAs and D-ABC, significant differences among DE120, ME100, and ME190 were observed. The ME100 and ME190 images revealed more artifact reduction and diagnosability than those of DE120.
  
  
  CONCLUSIONS
  DECT imaging followed by hypothetical monoenergetic image construction can cause R-DBAs and increase D-ABC and may be potentially used for the evaluation of postoperative changes in the bone encircling implant bodies.
authors.affiliation: Division of Oral and Maxillofacial Radiology, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
authors.forename: Ray
authors.initials: R
authors.lastname: Tanaka
authors.forename: Takafumi
authors.initials: T
authors.lastname: Hayashi
authors.forename: Makiko
authors.initials: M
authors.lastname: Ike
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Noto
authors.forename: Tazuko K
authors.initials: TK
authors.lastname: Goto
mesh_terms: D016477:Artifacts; D015921:Dental Implants; D006801:Humans; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D015921:Dental Implants