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Doppler Optical Coherence Tomography of Retinal Circulation
10:46

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Published on: September 18, 2012

High-penetration swept source Doppler optical coherence angiography by fully numerical phase stabilization.

Young-Joo Hong1, Shuichi Makita, Franck Jaillon

  • 1Computational Optics Group, University of Tsukuba, Tsukuba, Ibaraki, Japan.

Optics Express
|February 15, 2012
PubMed
Summary

A novel high-penetration swept-source optical coherence tomography system visualizes deep choroidal vasculature using a simple phase stabilization method. This technique enables detailed imaging of bidirectional blood flow without extra hardware, verified against indocyanine green angiography.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Deep choroidal vasculature imaging is crucial for diagnosing various eye diseases.
  • Current imaging techniques may lack penetration depth or require complex hardware.
  • Optical Coherence Tomography (OCT) offers high-resolution cross-sectional imaging.

Purpose of the Study:

  • To develop and validate a high-penetration swept-source OCT (HP-SS-OCT) system for deep choroidal imaging.
  • To implement a novel, hardware-independent numerical phase stabilization algorithm for Doppler OCT.
  • To demonstrate the capability of imaging bidirectional blood flow in the deep choroid.

Main Methods:

  • Development of an HP-SS-OCT system utilizing a 1-μm short cavity laser.
  • Application of Doppler OCT processing with a custom numerical phase stabilization algorithm.
  • Utilizing two distinct Doppler modes with varying time intervals for bidirectional flow analysis.
  • Comparison of en face projection images with Indocyanine Green Angiography (ICGA).

Main Results:

  • Successful imaging of bidirectional blood flow and vasculature in the deep choroid.
  • The numerical phase stabilization method proved simple and effective, requiring no additional calibration hardware.
  • The HP-SS-OCT system demonstrated utility comparable to ICGA for visualizing choroidal vasculature.
  • The developed system is adaptable for various SS-OCT applications.

Conclusions:

  • The novel HP-SS-OCT system with numerical phase stabilization provides effective deep choroidal vasculature imaging.
  • The hardware-independent stabilization method simplifies Doppler OCT implementation across different systems.
  • This technology holds promise for enhanced diagnosis and monitoring of ocular pathologies affecting the choroid.