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Multimodal Volumetric Retinal Imaging by Oblique Scanning Laser Ophthalmoscopy oSLO and Optical Coherence Tomography OCT
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An adaptive optics imaging system designed for clinical use.

Jie Zhang1, Qiang Yang1, Kenichi Saito2

  • 1Center for Visual Science, University of Rochester, Rochester, NY, 14642, USA ; Equal contribution first authors.

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|June 27, 2015
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Summary

This study introduces an advanced imaging system that stabilizes retinal images for better clinical use. The new adaptive optics scanning light ophthalmoscopy (AOSLO) system significantly reduces eye motion artifacts, improving visualization of retinal pathology.

Keywords:
(110.1080) Active or adaptive optics(120.3890) Medical optics instrumentation(170.3880) Medical and biological imaging(170.4470) Ophthalmology(330.2210) Vision - eye movements

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optical Imaging

Background:

  • Conventional adaptive optics scanning light ophthalmoscopy (AOSLO) is limited by small field of view (FOV), dependence on patient fixation, and extensive post-processing.
  • Existing eye-tracking methods for AOSLO fail in patients with poor fixation due to substantial FOV drift.

Purpose of the Study:

  • To develop and evaluate a novel imaging system that integrates wide field-of-view SLO (WFSLO) with AOSLO to overcome limitations of conventional AOSLO.
  • To improve real-time optical stabilization and image registration for retinal imaging, especially in patients with poor fixation.

Main Methods:

  • A multi-scale eye-tracking approach was implemented by optically and electronically integrating WFSLO with AOSLO.
  • The system utilizes fast tip/tilt mirrors for a large stabilization range (± 5.6°) and employs a three-stage parallel processing: coarse WFSLO stabilization, fine AOSLO stabilization, and sub-pixel digital registration.
  • System performance was evaluated in normal and diseased eyes with poor fixation.

Main Results:

  • The integrated system achieved significant reduction in residual image motion, down to ~0.05-0.07 arcmin in normal eyes and ~0.07-0.14 arcmin in eyes with poor fixation.
  • Image motion was reduced by an average factor of approximately 400.
  • The system demonstrated a steering subsystem for targeting regions of interest and real-time image averaging, eliminating post-processing time.

Conclusions:

  • The new integrated WFSLO-AOSLO system effectively addresses major limitations of conventional AOSLO, including FOV size and patient fixation issues.
  • This advanced optical design enhances clinical utility by providing superior image stabilization, enabling precise targeting of retinal pathology and real-time image processing.