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Scan tracking coordinates for improved centering of Stratus OCT scan pattern.

Gianmarco Vizzeri1, Christopher Bowd, Felipe A Medeiros

  • 1Department of Ophthalmology, Hamilton Glaucoma Center, University of California, San Diego, La Jolla, CA 92093-0946, USA.

Journal of Glaucoma
|January 15, 2009
PubMed
Summary

Optimizing Stratus optical coherence tomography (OCT) scan centering with scan tracking coordinates improves retinal nerve fiber layer (RNFL) thickness measurement reproducibility, especially in temporal sectors. Optic disc parameter reproducibility remains unaffected.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Accurate optical coherence tomography (OCT) image acquisition is crucial for diagnosing and monitoring ocular conditions.
  • Scan centering is a critical step in OCT imaging, particularly for Stratus OCT.
  • Current methods rely on subjective centering, which may introduce variability.

Purpose of the Study:

  • To describe and evaluate a novel technique for optimizing scan centering during Stratus OCT image acquisition.
  • To assess the impact of using scan tracking coordinates versus subjective centering on measurement reproducibility.

Main Methods:

  • An observational clinical study involving twelve eyes of six normal subjects.
  • Utilized Fast Retinal Nerve Fiber Layer (RNFL) thickness and Fast Optic Disc acquisition protocols.
  • Compared subjective scan centering with centering using scan tracking coordinates, analyzing reproducibility via Bland-Altman plots and ANOVA.

Main Results:

  • Scan tracking coordinates significantly reduced variability in RNFL thickness measurements, particularly in temporal sectors, compared to subjective centering.
  • No significant differences in reproducibility were observed for optic disc parameters between the two centering methods.
  • Bland-Altman analysis indicated good intra-operator agreement for scan coordinate calculations, demonstrating technique reproducibility.

Conclusions:

  • Employing scan tracking coordinates enhances the reproducibility of RNFL thickness measurements in Stratus OCT imaging.
  • The technique is particularly beneficial for temporal sector analysis.
  • Optic disc parameter reproducibility is not significantly impacted by minor scan position variations.