Swept-source OCT angiography of the retinal vasculature using intensity differentiation-based optical microangiography algorithms

Ophthalmic Surg Lasers Imaging Retina. Sep-Oct 2014;45(5):382-9. doi: 10.3928/23258160-20140909-08.

Abstract

Background and objective: To demonstrate the feasibility of using a 1,050-nm swept-source optical coherence tomography (SS-OCT) system to achieve noninvasive retinal vasculature imaging in human eyes.

Materials and methods: Volumetric data sets were acquired using a 1-µm SS-OCT prototype that operated at a 100-kHz A-line rate. A scanning protocol designed to allow for motion contrast processing, referred to as OCT angiography or optical microangiography (OMAG), was used to scan an approximately 3 × 3–mm area in the central macular region of the retina within approximately 4.5 seconds. An intensity differentiation-based OMAG algorithm was used to extract three-dimensional retinal functional microvasculature information.

Results: Intensity signal differentiation generated capillary-level resolution en face OMAG images of the retina. The parafoveal capillaries were clearly visible, thereby allowing visualization of the foveal avascular zone in healthy subjects.

Conclusion: The capability of OMAG to produce retinal vascular images was demonstrated using the 1-µm SS-OCT prototype. This technique has potential clinical value for studying retinal vasculature abnormalities.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • Algorithms*
  • Cell Count
  • Female
  • Fluorescein Angiography / methods*
  • Fundus Oculi
  • Healthy Volunteers
  • Humans
  • Imaging, Three-Dimensional*
  • Male
  • Middle Aged
  • Reproducibility of Results
  • Retinal Vessels / cytology*
  • Tomography, Optical Coherence / methods*