title: Preliminary study evaluating the accuracy of MRI images on CBCT images in the field of orthodontics.
abstract: OBJECTIVE
  The purpose of this study was to explore the 3-dimensional (3D) accuracy of magnetic resonance imaging (MRI) on cone-beam computed tomography (CBCT) images after the registration of MRI images on CBCT images.
  
  
  METHODS
  Three Japanese adult females volunteered for this study. To transform digital imaging and communication in medicine (DICOM) data derived from MRI and CBCT images into polygon data, five software programs were used. CBCT and MRI images were obtained within one week, and both were registered by the iterative closest point (ICP) method. To assess the accuracy of the composite MRI-CBCT, the measurement errors of the MRI-CBCT were verified Measurement values were compared using frontal and cephalometric soft-tissue landmarks. Differences were analyzed using the non-parametric Mann-Whitney U test.
  
  
  RESULTS
  There were no significant linear measurement errors (P > 0.05) when the images were measured from the superimposed MRI-CBCT images.
  
  
  CONCLUSIONS
  The MRI images attained from MRI - CBCT registration showed accurate 3D linear measurements.
authors.affiliation: Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.
authors.forename: K
authors.initials: K
authors.lastname: Tai
authors.forename: J H
authors.initials: JH
authors.lastname: Park
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Yanagi
authors.forename: J I
authors.initials: JI
authors.lastname: Asaumi
authors.forename: S
authors.initials: S
authors.lastname: Iida
authors.forename: J W
authors.initials: JW
authors.lastname: Shin
mesh_terms: D000328:Adult; D002508:Cephalometry; D054893:Cone-Beam Computed Tomography; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008279:Magnetic Resonance Imaging; D003765:Models, Dental; D009970:Orthodontics; D011873:Radiology Information Systems; D012815:Signal Processing, Computer-Assisted; D012886:Skull / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D012984:Software; D013382:Subtraction Technique