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Integrated Photoacoustic Ophthalmoscopy and Spectral-domain Optical Coherence Tomography
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Split-spectrum phase-gradient optical coherence tomography angiography.

Gangjun Liu1, Yali Jia1, Alex D Pechauer1

  • 1Casey Eye Institute, Oregon Health & Science University, 3375 SW Terwilliger Blvd., Portland, OR 97239, USA.

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|August 30, 2016
PubMed
Summary
This summary is machine-generated.

A novel phase gradient angiography (PGA) method for optical coherence tomography (OCT) maps microvasculature without motion correction. Combining PGA with split-spectrum techniques significantly enhances imaging performance for retinal circulation.

Keywords:
(110.4500) Optical coherence tomography(170.2655) Functional monitoring and imaging(170.3340) Laser Doppler velocimetry(170.3880) Medical and biological imaging

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Area of Science:

  • Ophthalmology
  • Biomedical Optics
  • Medical Imaging

Background:

  • Optical coherence tomography (OCT) is crucial for visualizing tissue microvasculature.
  • Existing OCT angiography methods can be affected by motion artifacts and noise.
  • Accurate mapping of retinal circulation is vital for diagnosing eye diseases.

Purpose of the Study:

  • To introduce a phase gradient angiography (PGA) method for OCT.
  • To improve microvasculature imaging by utilizing phase information and reducing artifacts.
  • To evaluate the performance of PGA in combination with other techniques for in-vivo retinal imaging.

Main Methods:

  • Developed a phase gradient angiography (PGA) technique for OCT.
  • Integrated PGA with amplitude/intensity information for enhanced performance.
  • Applied split-spectrum processing to further increase signal-to-noise ratio.
  • Conducted in-vivo imaging of human retinal circulation using spectral domain and swept source OCT systems.

Main Results:

  • PGA effectively maps microvasculature without needing bulk motion or jitter correction.
  • Combining PGA with amplitude/intensity improved imaging performance.
  • Split-spectrum technique increased the signal-to-noise ratio by over two times.
  • The best performance was achieved using split-spectrum amplitude and phase-gradient angiography.

Conclusions:

  • Phase gradient angiography (PGA) offers a robust method for OCT angiography.
  • The combined split-spectrum amplitude and PGA technique provides superior performance for retinal imaging.
  • This advanced OCT angiography method holds promise for improved diagnosis and monitoring of retinal vascular conditions.