title: [Accuracy of three-dimensional facial image based on phase measuring profilometry].
abstract: OBJECTIVE
  Three-dimensional (3-D) facial images are very useful for orthodontic diagnosis. Three-dimensional facial imaging system (DSC-2) based on phase measuring profilometry (PMP) was used to obtain images and tested for accuracy.
  
  
  METHODS
  Geometric strips (20 mm in width) was used to test the accuracy of the obtained images. Three-dimensional images of plaster head model with marker of 5 mm x 5 mm were taken by DSC-2 three-dimensional facial imaging system. The difference of measurements was compared between both methods. Measurements were repeated twice by three different doctors.
  
  
  RESULTS
  The average value of width in 3-D mode was 19.5 mm. No significant difference was found, compared with actual width (20 mm). There was no significant difference between computer measurement and manual measurement of the plaster head model (P > 0.05).
  
  
  CONCLUSIONS
  DSC-2 three-dimensional facial imaging system was accurate and reliable to obtain 3-D facial images.
authors.affiliation: Department of Orthodontics, Peking University School and Hosptial of Stomatology, Beijing 100081, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Li-li
authors.initials: LL
authors.lastname: Ma
authors.forename: Si
authors.initials: S
authors.lastname: Chen
authors.forename: Tian-min
authors.initials: TM
authors.lastname: Xu
mesh_terms: D005145:Face / Q000033:anatomy & histology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D010780:Photogrammetry / Q000379:methods*