Semiautomated MRI-Based Method for Orbital Volume and Contour Analysis.
Lital Smadar1,2, Mattan Arazi1,2, Gahl Greenberg2,3
1Orbital Ophthalmic Plastic & Lacrimal Surgery Institute, Goldschleger Eye Institute, Sheba Medical Center, Tel Hashomer.
Ophthalmic Plastic and Reconstructive Surgery
|March 27, 2024
Summary
This study introduces a novel semiautomated MRI method for measuring orbital dimensions, which closely correlates with CT scans. This technique offers a valuable tool for assessing orbital pathologies, especially in pediatric patients.
Area of Science:
- Ophthalmology and Medical Imaging
- Radiology and Orbital Mechanics
Background:
- Accurate orbital cavity measurements are crucial for managing ocular and orbital diseases.
- Computed tomography (CT) is commonly used, but magnetic resonance imaging (MRI) is preferred for soft tissue assessment, particularly in pediatric cases.
Purpose of the Study:
- To introduce and validate a novel semiautomated MRI-based approach for depicting orbital shape and dimensions.
- To compare MRI-derived orbital measurements with CT-based measurements.
Main Methods:
- A retrospective cohort study involving 31 patients with at least one normal orbit who underwent both CT and MRI.
- Orbital dimensions (volume, length, depth) were determined using manual segmentation and 3D image processing software.
- Comparison of measurements between MRI and CT scans.
Main Results:
- A strong correlation was found between CT and MRI measurements for orbital volume (r=0.92), horizontal length (r=0.65), vertical length (r=0.57), and depth (r=0.46).
- Mean differences between CT and MRI measurements were minimal, with no statistically significant differences for volume, horizontal length, vertical length, or depth.
- The semiautomated MRI method demonstrated high agreement with the gold standard CT measurements.
Conclusions:
- The developed semiautomated MRI method accurately calculates orbital volume and contour.
- This validated MRI technique is a valuable tool for evaluating various orbital conditions.
- The method shows particular promise for pediatric patients where MRI is often indicated.
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