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Quantitative OCT angiography measures retinal and choroidal blood flow by analyzing motion contrast in sequential OCT scans. Algorithms calculate vessel density, perfusion, and flow index values for each retinal layer. These numerical outputs help detect microvascular changes earlier than visible structural loss. Clinicians use it to monitor diabetic retinopathy, glaucoma, and macular disease.
read more about quantitative oct angiography ...Standard OCT captures cross‐sectional images, while OCTA detects variations caused by moving red blood cells. Multiple scans at the same location build a motion map representing flow. Quantitative metrics are computed automatically and displayed as en face images or charts. The method is noninvasive and dye‐free, unlike fluorescein angiography.
The technique highlights vessels without injections. Repeated scans detect subtle circulation changes. Layer‐by‐layer images expose hidden abnormalities. It is especially helpful for macular and diabetic conditions.
It detects reduced perfusion, capillary dropout, or abnormal vessel formation even before structural changes appear. Numeric trends show disease progression or treatment response. It helps separate ischemic from non-ischemic forms of retinal conditions.
Motion artifacts, poor fixation, media opacity, and segmentation errors can distort maps. Calibration and signal strength are critical for repeatability. High-quality scans improve diagnostic confidence and reduce false interpretations.
Yes, it uses near-infrared light without dyes or injections. The test is quick and comfortable, making it suitable for regular follow-up. Results appear instantly for analysis and comparison.
How long does the test take? Usually under 10 minutes.
Can children undergo OCTA? Yes, if they can fixate steadily.
Does it replace fluorescein angiography? It complements it for flow evaluation without dye risks.
Optical Coherence Tomography Angiography. StatPearls Publishing. https://www.ncbi.nlm.nih.gov/books/NBK563235/. Updated 2024.
Optical Coherence Tomography Angiography: A 2023 Focused Update on Age-Related Macular Degeneration. Tombolini B, et al. PubMed Central (PMC). https://pmc.ncbi.nlm.nih.gov/articles/PMC10787708/. Published 2024.
Quantitative Biomarkers in Optical Coherence Tomography Angiography: A Review. Sun S, et al. Survey of Ophthalmology. https://www.sciencedirect.com/science/article/pii/S0039625722000371. July 2022.
Advances in OCT Angiography. Hormel TT, et al. PubMed Central (PMC). https://pmc.ncbi.nlm.nih.gov/articles/PMC11905608/. Published 2025.
Evaluation of OCT Angiography Parameters as Biomarkers of Primary Open-Angle Glaucoma. Kancheva K, et al. PubMed Central (PMC). https://pmc.ncbi.nlm.nih.gov/articles/PMC12785382/. Published 2025.