title: High-quality image acquisition by double exposure overlap in dental cone beam computed tomography.
abstract: OBJECTIVE
  With a double exposure overlapping cone beam computed tomography (CBCT) scan technique, using CBCT acquisition radiation dose, the objective was to obtain apparent density similar to that of multidetector computed tomography (MDCT).
  
  
  METHODS
  Factory quality-assurance phantom and water phantom were used for the evaluation of apparent density fidelity of iCAT scans in different modes. Each scan's apparent density was analyzed for identical regions using ImageJ, version 1.42q.
  
  
  RESULTS
  The iCAT Classic extended height acquisition with 4-cm central overlap and reconstruction of 2 groups of 300 projections per rotation for the water and quality-assurance CBCT phantoms resulted in improved apparent density fidelity. This apparent density accuracy was superior to that of iCAT scan at high resolution (600 projections during 1 rotation).
  
  
  CONCLUSIONS
  Using double exposure overlapping CBCT scans allows the analysis quality to be comparable with that of MDCT.
authors.affiliation: Research Associate, University of Szeged, Faculty of Dentistry, Szeged, Hungary. Electronic address: Plachtovics.mark@stoma.szote.u-szeged.hu.
authors.forename: Mark
authors.initials: M
authors.lastname: Plachtovics
authors.affiliation: Research Associate, Oral and Maxillo-Facial Surgery Department, University of Oulu, Oulu, Finland.
authors.forename: Peter
authors.initials: P
authors.lastname: Bujtar
authors.affiliation: Professor, Department of Cranio-Maxillo-Facial Surgery, European Face Centre, Vrije Universiteit Brussel, Brussels, Belgium.
authors.forename: Katalin
authors.initials: K
authors.lastname: Nagy
authors.affiliation: Professor, University of Szeged, Faculty of Dentistry, Szeged, Hungary.
authors.forename: Maurice
authors.initials: M
authors.lastname: Mommaerts
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000379:methods*; D006801:Humans; D021621:Imaging, Three-Dimensional; D061330:Multidetector Computed Tomography; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods