Improved repeatability of retinal thickness measurements using line-scan ophthalmoscope image-based retinal tracking

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Diagnostics

Background:

• Accurate retinal thickness measurements are crucial for diagnosing and monitoring retinal diseases.
• Existing optical coherence tomography (OCT) systems utilize different tracking methods, impacting measurement repeatability.
• Line-scan ophthalmoscope (LSO) technology offers potential advancements in OCT imaging.

Purpose of the Study:

• To evaluate the repeatability and speed of an LSO image-based tracking system for OCT.
• To compare the performance of LSO tracking with a traditional point-scanning tracking system.
• To assess the impact of LSO tracking on central subfield thickness (CST) measurements.

Main Methods:

• Thirty-five eyes with retinal diseases were scanned using two spectral-domain OCT devices.
• Scans were performed on a Cirrus HD-OCT with and without LSO tracking enabled.
• A Spectralis HRA+OCT with point-scan tracking was used for comparison.

Main Results:

• The Cirrus HD-OCT with LSO tracking demonstrated superior repeatability for CST measurements (SD 1.5 µm) compared to without tracking (SD 3.0 µm) and the Spectralis (SD 4.0 µm).
• Coefficient of variation for CST was lowest with LSO tracking (0.5%).
• Scan acquisition time was faster with the Cirrus HD-OCT (4.3 s without tracking, 7.8 s with tracking) compared to the Spectralis (12.3 s).

Conclusions:

• Real-time LSO image-based retinal tracking significantly improves the repeatability of OCT retinal thickness measurements.
• The LSO tracking system provides more reliable and consistent OCT data for clinical use.
• This technology represents an advancement in OCT imaging for retinal disease management.