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B. M. Levine, S. M. Seedial, A. J. Tsiouris, G. J. Lelli, Jr.; Three Dimensional Volumetric Assessment of Orbital Fracture Size: A Novel Technique. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4874.
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© ARVO (1962-2015); The Authors (2016-present)
Background: Orbital volumetric measurements are useful for diagnostic and decision making purposes in orbital fractures. Prior volumetric studies utilize 2-dimentional analyses to determine orbital volume differences.
The purpose of this study is to present a novel technique of measuring orbital volume with 3-D multiplanar volumetric analysis which can be used to quantify the increase in orbital volume associated with orbital fractures.
3-D volumetric analysis was used to measure the volumes of both orbits in six patients with unilateral orbital fractures. Each patient had a helical CT scan of the orbits with slice thickness ranging from 0.625 - 1.25 mm, 120 KVP, 200-250 mA and 15 FOV. Using 3-D MRP software on a GE Advantage Workstation and volume viewer 8.3.65 software, an attending neuroradiologist outlined the intraorbital contents on MRP reformations; the software then accurately calculated the total volume and created 3D volume rendered reformations. The percent of fracture-related volume expansion relative to the fellow normal orbit was then calculated using the formula, [(volume fractured orbit - volume normal orbit) / volume normal orbit].
Orbital volume of the fractured orbits (mean + SD) was 27.76 + 3.846 cm3. The volume of the normal orbits was 25.355 + 3.07 cm3. The percent of fracture-related volume expansion was 9.471 + 7.803%. The finding of an increase in volume of the fractured orbits, compared to the normal fellow orbits, is consistent with previous studies which have compared orbital volumes in unilateral fracture patients.
3-D multiplanar volumetric analysis is a novel and efficient way to measure orbital volume. Measurement of orbital volume in orbital fracture cases may help guide treatment. However, previously described methods for determining the orbital volume require time and labor intensive CT scan manipulation and calculations. The authors believe that this new technique of orbital volume measurement may provide a more practical tool for helping in the management orbital fractures.
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