OCT angiography (OCTA) is an advanced imaging technology that creates detailed maps of blood vessels in the retina and optic nerve head without needing injected dye. It combines OCT technology with motion detection to visualize blood flow.

Key takeaways

  • Visualizes retinal blood vessels non-invasively
  • No dye injection needed
  • Shows blood flow at different depths
  • Quick, comfortable scan
  • Useful for vascular and optic nerve conditions

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Visual guide: OCT angiography: map blood flow without dye
Educational schematic showing motion-based vessel mapping at different retinal depths and key OCT angiography limitations.
Read this visual as text
Detect moving blood cells: Repeated OCT measurements detect motion to map vessel networks. Separate retinal depths: Different layers can be examined without an injected dye. Know the limits: Movement can distort the scan; OCTA does not show dye leakage.
Educational schematic: oct angiography: map blood flow without dye. Symbols summarize the article; they are not clinical images.

How It Works

  • Uses OCT technology
  • Detects motion of blood cells
  • Creates maps of blood vessel networks
  • Different depths can be analyzed separately

Why It's Done

  • Evaluate optic nerve blood flow
  • Detect vascular abnormalities
  • Assess macular conditions
  • Monitor glaucoma
  • Research applications in neuro-ophthalmology

Advantages Over Fluorescein Angiography

OCTA Fluorescein Angiography
No dye injection Requires IV dye
Can be repeated easily Side effects from dye
Depth-resolved images Surface view mainly
Quick scan Longer procedure
No injected-dye reaction risk Possible reaction to injected dye

What to Expect

  • Same setup as regular OCT
  • Chin on rest, focus on target
  • Multiple scans acquired
  • Computer processes images
  • Takes 5-10 minutes

Limitations

  • Limited field of view
  • Motion artifacts can affect quality
  • Cannot show leakage (unlike FA)
  • Technology still evolving
  • Interpretation requires expertise

In Neuro-Ophthalmology

  • Research tool for optic nerve conditions
  • Assess papilledema
  • Evaluate ischemic conditions
  • Growing applications

References

  1. American Academy of Ophthalmology. Beginners Guide to OCT-A.