title: Measurement of orbital volume by a 3-dimensional software program: an experimental study.
abstract: OBJECTIVE
  This study reports a simple method with high accuracy for determining orbital volume from computed tomography (CT) scans.
  
  
  METHODS
  The volume of 20 orbits was evaluated in 20 dry skulls by use of a 3-dimensional software program in General Electric High-Speed Advantage CT/I (Milwaukee, WI), and compared with the volume obtained by direct measurement using the water displacement method. Accuracy of volume measurement by this software program was assessed statistically by paired samples t-test.
  
  
  RESULTS
  The mean volume was found to be 28.37 mL +/- 2.15 by direct impression and 28.41 mL +/- 2.09 by the software program. Volume difference between the 2 methods averaged 0.93 +/- 1.08 mL for each orbit (P < .01). The correlation between the techniques was found to be high (r = 0.887, P < .01). There was no significant volume discrepancy between the 2 methods.
  
  
  CONCLUSIONS
  Measurement by the technique described is an easy and accurate method of assessing the volume of the orbit.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Gülhane Military Medical Academy, Ankara, Turkey. mdeveci98@yahoo.com
authors.forename: M
authors.initials: M
authors.lastname: Deveci
authors.forename: S
authors.initials: S
authors.lastname: Oztürk
authors.forename: M
authors.initials: M
authors.lastname: Sengezer
authors.forename: Y
authors.initials: Y
authors.lastname: Pabuşcu
mesh_terms: D003399:Craniotomy / Q000379:methods*; D006801:Humans; D009915:Orbit / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D012015:Reference Standards; D015203:Reproducibility of Results; D012984:Software; D014057:Tomography, X-Ray Computed / Q000379:methods