OCT Angiography

What is OCT Angiography?

Optical Coherence Tomography Angiography (OCTA) is a non-invasive imaging technique used to visualize blood flow in the retina and other tissues, particularly in the eye. It utilizes the principles of Optical Coherence Tomography (OCT) and analyzes the movement of red blood cells to create high-resolution, three-dimensional images of the vasculature.

What is the procedure for OCTA?

Repeated scans: OCTA repeatedly scans the same area of tissue to detect changes in the OCT signal caused by moving blood cells.
Decorrelation signals: The difference in the OCT signal between scans (either amplitude or phase) is used to identify blood flow, a process called decorrelation.
3D image construction: By analyzing these decorrelation signals, OCTA algorithms create a three-dimensional map of blood flow within the tissue.

How it works:

OCTA works by repeatedly scanning the same location in the eye and analyzing changes in the OCT signal between scans. Moving red blood cells cause a change in the OCT signal (either amplitude or phase) that is detected as blood flow. By analyzing these changes, OCTA can generate detailed images of the blood vessels and their flow patterns.

Key advantages:

Non-invasive: Unlike fluorescein angiography, OCTA does not require dye injections, reducing risks and making it suitable for a wider range of patients.
3D imaging: OCTA provides three-dimensional images of the retinal vasculature, allowing for a more comprehensive view of the blood flow patterns.
High resolution: OCTA can visualize small blood vessels, including capillaries, with high resolution.
Time-efficient: OCTA scans are relatively quick, making it a practical tool for clinical use.

Clinical applications:

Diagnosis and monitoring of retinal diseases: OCTA is used to diagnose and monitor various retinal conditions, such as diabetic retinopathy, age-related macular degeneration, and glaucoma.
Assessment of choroidal neovascularization: OCTA can help identify and characterize choroidal neovascularization, a condition where new blood vessels grow abnormally in the choroid.
Evaluation of other vascular diseases: OCTA can be used to assess blood flow in other parts of the eye, such as the iris and conjunctiva.
Research applications: OCTA is a valuable tool for research in ophthalmology, allowing scientists to study the microvasculature of the eye in detail.

Duration

The duration of the OCT Angiography test will be 5 – 10 mins.

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