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Orbital volume analysis: validation of a semi-automatic software segmentation method.

Jesper Jansen1, Ruud Schreurs2,3, Leander Dubois2

  • 1Orbital Unit, Department of Oral and Maxillofacial Surgery, Academic Medical Centre, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. j.jansen@amc.uva.nl.

International Journal of Computer Assisted Radiology and Surgery
|July 17, 2015
PubMed
Summary
This summary is machine-generated.

A new software method (SA) accurately measures orbital volume, offering a quick and reproducible alternative to manual segmentation for pre-operative planning in orbital reconstruction.

Keywords:
Orbital fracturesOrbital reconstructionOrbital volume measurementPre-operative planningSegmentationValidation

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Area of Science:

  • Medical Imaging
  • Computational Anatomy
  • Surgical Planning

Background:

  • Precise measurement of orbital volume is crucial for pre-operative planning and intraoperative navigation in orbital reconstruction.
  • Manual segmentation serves as the gold standard but can be time-consuming.

Purpose of the Study:

  • To validate a semi-automatic software segmentation method for accurate and reproducible measurement of unaffected bony orbital volume.
  • To compare the accuracy, reproducibility, and time efficiency of different software-based segmentation techniques against manual segmentation.

Main Methods:

  • Three segmentation methods (automatic, automatic minus masks, automatic minus masks with manual adjustments) were compared to manual segmentation (gold standard) using iPlan software on 21 CT scans.
  • Interobserver and intraobserver agreement for manual segmentation and anterior boundary definition were assessed.
  • Accuracy, reproducibility, and time efficiency of each method were evaluated.

Main Results:

  • Manual segmentation demonstrated high intraobserver (0.997) and interobserver (0.994) agreement.
  • Method SA (automatic minus masks) showed the smallest average volumetric difference (0.24 cc) compared to the gold standard, with high accuracy and reproducibility.
  • Method SA was significantly faster (146 seconds) than manual adjustments (method SAA, 327 seconds) and more accurate than the fully automatic method (method A, 0.49 cc difference).

Conclusions:

  • The semi-automatic method SA provides an accurate, reproducible, quick, and user-friendly approach for orbital volume measurement.
  • Fully automatic method A is fast but suboptimal for clinical use due to lower accuracy.
  • Manual adjustments (method SAA) are time-intensive without improving volume accuracy, with discrepancies often near the inferior orbital fissure.