title: Evaluation of accuracy of 3D reconstruction images using multi-detector CT and cone-beam CT.
abstract: OBJECTIVE
  This study was performed to determine the accuracy of linear measurements on three-dimensional (3D) images using multi-detector computed tomography (MDCT) and cone-beam computed tomography (CBCT).
  
  
  METHODS
  MDCT and CBCT were performed using 24 dry skulls. Twenty-one measurements were taken on the dry skulls using digital caliper. Both types of CT data were imported into OnDemand software and identification of landmarks on the 3D surface rendering images and calculation of linear measurements were performed. Reproducibility of the measurements was assessed using repeated measures ANOVA and ICC, and the measurements were statistically compared using a Student t-test.
  
  
  RESULTS
  All assessments under the direct measurement and image-based measurements on the 3D CT surface rendering images using MDCT and CBCT showed no statistically difference under the ICC examination. The measurements showed no differences between the direct measurements of dry skull and the image-based measurements on the 3D CT surface rendering images (P>.05).
  
  
  CONCLUSIONS
  Three-dimensional reconstructed surface rendering images using MDCT and CBCT would be appropriate for 3D measurements.
authors.affiliation: Department of Orthodontics, Hangang Sacred Heart Hospital, Graduate School of Clinical Dentistry, Hallym University, Seoul, Korea.
authors.forename: Mija
authors.initials: M
authors.lastname: Kim
authors.forename: Kyung-Hoe
authors.initials: KH
authors.lastname: Huh
authors.forename: Won-Jin
authors.initials: WJ
authors.lastname: Yi
authors.forename: Min-Suk
authors.initials: MS
authors.lastname: Heo
authors.forename: Sam-Sun
authors.initials: SS
authors.lastname: Lee
authors.forename: Soon-Chul
authors.initials: SC
authors.lastname: Choi