title: A new method to assess the accuracy of a Cone Beam Computed Tomography scanner by using a non-contact reverse engineering technique.
abstract: OBJECTIVE
  Today Cone Beam Computed Tomography (CBCT) has become an important image technique for dento-maxilla facial applications. In the paper a new method to assess the geometric accuracy of these systems was proposed. It uses a free form benchmark model and a non-contact Reverse Engineering (RE) system.
  
  
  METHODS
  The test geometry chosen for this study was designed in such a way that it simulated human spongy bone, cortical bone, gingiva and teeth and it composed of removable free form parts. It was acquired with a high-resolution laser scanner (D700 Scanner - 3Shape, Denmark). The reference 3D surface models obtained with the laser scanner was compared with the 3D models that were created from a CBCT system (Scanora 3D - Soderex, Finland) and from a traditional Multi-Slice Computed Tomography (MSCT) scanner (LightSpeed VCT 64 Slice - General Electric, USA) at different reconstruction settings, using an iterative closest point algorithm (ICP) in Geomagic(®) software.
  
  
  RESULTS
  The comparison between the different pairs of CAD models clearly shows that there is a good overlap between the models.
  
  
  CONCLUSIONS
  Although the results obtained in this study could lead to increase the use of CBCT for an increasing number of dental procedures, the publication of the European Commission guidelines represents a baseline on which the clinicians should rely heavily when considering the use of CBCT in their practice.
  
  
  CONCLUSIONS
  The results of this research show that the accuracy of CBCT 3D models is comparable to MSCT 3D models.
authors.affiliation: University of Naples Federico II, School of Engineering, Department of Industrial Engineering, P.Le Tecchio, 80, 80125 Naples, Italy. Electronic address: massimo.martorelli@unina.it.
authors.forename: Massimo
authors.initials: M
authors.lastname: Martorelli
authors.affiliation: University of Naples Federico II, School of Dentistry, Department of Restorative Dentistry, Via S. Pansini 5, 80131 Naples, Italy. Electronic address: pietro.ausiello@unina.it.
authors.forename: Pietro
authors.initials: P
authors.lastname: Ausiello
authors.affiliation: Morrone Radiology Center, Via Marchesiello132, 81100 Caserta, Italy. Electronic address: morroner@gmail.com.
authors.forename: Renato
authors.initials: R
authors.lastname: Morrone
mesh_terms: D000465:Algorithms; D019985:Benchmarking / Q000706:statistics & numerical data; D001842:Bone and Bones / Q000000981:diagnostic imaging; D017076:Computer-Aided Design; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation / Q000706:statistics & numerical data*; D003743:Dental Enamel / Q000000981:diagnostic imaging; D003804:Dentin / Q000000981:diagnostic imaging; D004738:Engineering / Q000706:statistics & numerical data; D005881:Gingiva / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000706:statistics & numerical data; D021621:Imaging, Three-Dimensional / Q000379:methods; D007834:Lasers; D008953:Models, Anatomic; D061330:Multidetector Computed Tomography / Q000295:instrumentation / Q000706:statistics & numerical data; D014070:Tooth / Q000000981:diagnostic imaging
keywords: Benchmark free form model; Cone Beam Computed Tomography (CBCT); Laser scan; Multi-Slice Computed Tomography (MSCT); Virtual modelling