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Shoaib Ugradar, Naresh Joshi, Daniel Rootman, Nigel Davies, Robert Goldberg; A Novel CT Based Technique for the Calculation of Bony Orbital Volume. Invest. Ophthalmol. Vis. Sci. 2016;57(12):222. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
We propose a novel CT based technique that allows the accurate calculation of bony orbital volume. At present, there is no consensus on the calculation of bony orbital volume using CT scans
The authors calculated the bony orbital volumes (BOV) of 30 patients using FDA approved software utilising a manual segmentation technique. To date, this technique has not been used for this purpose. Two observers independently calculated the BOV using our novel definitions of the bony orbit. Both observers calculated the volume of all orbits twice. Data collection allowed the calculation of intra-observer and inter-observer variability.
The mean normal orbital volume for left and right orbits was 16.3 ± 1.48 ml and 15.9 ± 1.7 ml in male and 14.5.0 ± 2.23 ml and 14.2 ± 1.7 ml in female subjects. The inter-observer variability was <1.4% whilst the intra-observer variability was <1.3% for measured orbits.
Using this high end software, our technique for BOV calculation is a simple and reliable tool. The low intra-observer variability reflects the simplicity of our protocol and makes the technique accessible to non radiologists.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
Definition of the anterior and posterior limits of the bony orbit
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