Measurement of orbital volume by a 3-dimensional software program: an experimental study

J Oral Maxillofac Surg. 2000 Jun;58(6):645-8. doi: 10.1016/s0278-2391(00)90157-5.


Purpose: This study reports a simple method with high accuracy for determining orbital volume from computed tomography (CT) scans.

Materials and 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.

Conclusion: Measurement by the technique described is an easy and accurate method of assessing the volume of the orbit.

MeSH terms

  • Craniotomy / methods*
  • Humans
  • Orbit / anatomy & histology*
  • Orbit / diagnostic imaging
  • Reference Standards
  • Reproducibility of Results
  • Software
  • Tomography, X-Ray Computed / methods