title: Accuracy of segmentation of tooth structures using 3 different CBCT machines.
abstract: OBJECTIVE
  The aim of this study was to evaluate the volumetric accuracy and reliability of cone beam computed tomography (CBCT)-based tooth segmentation using 4 different CBCT exposure protocols.
  
  
  METHODS
  Two dry, intact adult human mandibles of unknown gender were scanned using 4 different CBCT exposure protocols (3 CBCT systems). The available mandibular premolars (3 per mandible) were segmented, resulting in a total of 24 segmented teeth. To assess the accuracy of the segmented teeth, volumetric and morphologic differences between the real anatomic teeth and the reconstructed images were evaluated both physically and using a high-resolution micro-computed tomography system.
  
  
  RESULTS
  Results revealed a high accuracy of CBCT reconstructed images when comparing volumetric measures of CBCT-based segmented premolars to physical measurements of corresponding physical teeth. Volumetric differences were below 2%. Morphologic differences using the segmented model and the corresponding micro-computed tomography scans of the physical teeth indicated that when inaccuracies occurred, they were at the apical and coronal parts of the tooth.
  
  
  CONCLUSIONS
  Based on these results, CBCT can be used as a tool for segmentation and pretherapeutic planning procedures.
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.
authors.forename: Eman
authors.initials: E
authors.lastname: Shaheen
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium.
authors.forename: Wael
authors.initials: W
authors.lastname: Khalil
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium.
authors.forename: Mostafa
authors.initials: M
authors.lastname: Ezeldeen
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium.
authors.forename: Elke
authors.initials: E
authors.lastname: Van de Casteele
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.
authors.forename: Yi
authors.initials: Y
authors.lastname: Sun
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.
authors.forename: Constantinus
authors.initials: C
authors.lastname: Politis
authors.affiliation: OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium; Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium; Department of Dental Medicine, Karolinska Institutet, Stockholm, Sweden. Electronic address: reinhilde.jacobs@med.kuleuven.be.
authors.forename: Reinhilde
authors.initials: R
authors.lastname: Jacobs
mesh_terms: D001641:Bicuspid / Q000000981:diagnostic imaging*; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation*; D006801:Humans; D021621:Imaging, Three-Dimensional; D066298:In Vitro Techniques; D008334:Mandible / Q000000981:diagnostic imaging*; D011857:Radiographic Image Interpretation, Computer-Assisted; D015203:Reproducibility of Results; D012984:Software; D055114:X-Ray Microtomography