Abstract
Purpose
Objective determination of the orbital volume is important in the diagnostic process and in evaluating the efficacy of medical and/or surgical treatment of orbital diseases. Tools designed to measure orbital volume with computed tomography (CT) often cannot be used with cone beam CT (CBCT) because of inferior tissue representation, although CBCT has the benefit of greater availability and lower patient radiation exposure. Therefore, a model-based segmentation technique is presented as a new method for measuring orbital volume and compared to alternative techniques.
Methods
Both eyes from thirty subjects with no known orbital pathology who had undergone CBCT as a part of routine care were evaluated (\(n = 60\) eyes). Orbital volume was measured with manual, atlas-based, and model-based segmentation methods. Volume measurements, volume determination time, and usability were compared between the three methods. Differences in means were tested for statistical significance using two-tailed Student’s t tests.
Results
Neither atlas-based \((26.63 \pm 3.15\,\hbox {mm}^{3})\) nor model-based \((26.87 \pm 2.99\,\hbox {mm}^{3})\) measurements were significantly different from manual volume measurements \((26.65 \pm 4.0\,\hbox {mm}^{3})\). However, the time required to determine orbital volume was significantly longer for manual measurements (\(10.24 \pm 1.21\) min) than for atlas-based (\(6.96 \pm 2.62\) min, \(p < 0.001\)) or model-based (\(5.73 \pm 1.12\) min, \(p < 0.001\)) measurements.
Conclusion
All three orbital volume measurement methods examined can accurately measure orbital volume, although atlas-based and model-based methods seem to be more user-friendly and less time-consuming. The new model-based technique achieves fully automated segmentation results, whereas all atlas-based segmentations at least required manipulations to the anterior closing. Additionally, model-based segmentation can provide reliable orbital volume measurements when CT image quality is poor.
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Acknowledgments
The work of MEHW and JTL is funded, in part, by the German Federal Ministry of Education and Research. This work was funded by AOCMF. The sponsor or funding organization had no role in the design or conduct of this research. MB contributed to this work while working at the Institute for Man-Machine Communication, Leibniz University Hannover, Germany.
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Wagner, M.E.H., Gellrich, NC., Friese, KI. et al. Model-based segmentation in orbital volume measurement with cone beam computed tomography and evaluation against current concepts. Int J CARS 11, 1–9 (2016). https://doi.org/10.1007/s11548-015-1228-8
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DOI: https://doi.org/10.1007/s11548-015-1228-8