Related Experiment Videos
Tracking the optic nervehead in OCT video using dual eigenspaces and an adaptive vascular distribution model
Dara Koozekanani1, Kim L Boyer, Cynthia Roberts
1Biomedical Engineering Program, Signal Analysis and Machine Perception Laboratory, Department of Electrical Engineering, College of Medicine, The Ohio State University, Columbus, OH 43210-1272, USA.
IEEE Transactions on Medical Imaging
|December 3, 2003
Summary
This study introduces a new system for Optical Coherence Tomography (OCT) to accurately track the optic nerve head during retinal imaging. This improves glaucoma monitoring by precisely identifying the scan path, even with involuntary eye movements.
Area of Science:
- Ophthalmology
- Medical Imaging
- Biomedical Engineering
Background:
- Optical Coherence Tomography (OCT) provides cross-sectional retinal views but is susceptible to involuntary eye motion, which can lead to undetected imaging errors.
- Accurate tracking of the scan path relative to the optic nerve head is critical for glaucoma monitoring.
Purpose of the Study:
- To develop and validate a prototype system for detecting the optic nerve head and the scanning beam in OCT video.
- To report the true scan path relative to the optic nerve head, compensating for eye motion.
Main Methods:
- An adaptive model construction phase identifies retinal vasculature and the optic nerve head to build a subject-specific vascular pattern model.
- A multitiered nerve head identification uses dual eigenspace techniques and geometric vessel-to-nerve head comparisons.
- An operational phase establishes correspondence between detected vasculature and the model to determine the true scan path.
Main Results:
- The system located the optic nerve head within 5 pixels (0.07 optic disk diameters) in 99.75% of 2800 video fields on untrained subjects.
- This accuracy is a significant improvement over current clinical practice where motions of 1-2 disc diameters can go undetected.
Conclusions:
- The developed system reliably detects the optic nerve head and compensates for eye motion in OCT imaging.
- This technology offers a substantial advancement for accurate and reliable glaucoma monitoring and other ophthalmic assessments.