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OCT vs. OCTA: What the Blood-Flow Layer Reveals That Structure Alone Cannot
Oct 15 , 2026
OCT shows you structure. OCTA shows you perfusion. A standard optical coherence tomography (OCT) scan answers the question "what does this tissue look like?" — it renders the retinal layers as a cross-section, micrometer by micrometer. OCT angiography (OCTA) answers a different question: "is blood actually reaching this tissue, and in which layer?" It builds that map from repeated OCT scans of the...
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