title: Accuracy of linear measurements in cone beam computed tomography with different voxel sizes.
abstract: OBJECTIVE
  To evaluate the accuracy of linear measurements on dry mandible specimens using cone beam computed tomography (CBCT) images acquired with different voxel sizes.
  
  
  METHODS
  Eight human dry mandibles were submitted to CBCT examination, using the i-CAT (Imaging Sciences, Inc. Hatfield, PA) device and four protocols with different voxel sizes. Tomographic slices with a more central view of the markers, placed on six sites on each mandible, were selected to perform measurements. Values obtained from direct measurements on the dry mandible after sectioning them on the preestablished sites were compared with measurements from the tomographic images and the measurement error.
  
  
  RESULTS
  There was no statistical difference between the measurement error of the protocols (P = 0.606). The mean value of the difference between the values obtained in the images and the dry mandible was smaller than 1 mm for all the protocols.
  
  
  CONCLUSIONS
  The accuracy of vertical and horizontal measurements, using CBCT (i-CAT) for the four protocols, was shown to be comparable with the measurements performed on the dry mandible.
authors.affiliation: Department of Oral and Maxillofacial Radiology, School of Dentistry, Federal University of Bahia, Salvador, BA, Brazil. torresmarianna@hotmail.com
authors.forename: Marianna Guanaes Gomes
authors.initials: MG
authors.lastname: Torres
authors.forename: Paulo Sérgio Flores
authors.initials: PS
authors.lastname: Campos
authors.forename: Nilson Pena Neto
authors.initials: NP
authors.lastname: Segundo
authors.forename: Marcus
authors.initials: M
authors.lastname: Navarro
authors.forename: Iêda
authors.initials: I
authors.lastname: Crusoé-Rebello
mesh_terms: D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging; D059925:Anatomic Landmarks / Q000000981:diagnostic imaging; D002138:Calibration; D002508:Cephalometry / Q000592:standards*; D054893:Cone-Beam Computed Tomography / Q000592:standards*; D003724:Dental Arch / Q000000981:diagnostic imaging; D003758:Dental Implantation, Endosseous; D057918:Fiducial Markers; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000592:standards*; D007575:Jaw, Edentulous / Q000000981:diagnostic imaging; D008334:Mandible / Q000000981:diagnostic imaging*; D010347:Patient Care Planning / Q000592:standards