Optical Coherence Tomography (OCT) C Fundamentals Practice Test

What information does an A-scan provide in OCT?

Blood flow in the retina Thickness of the cornea Spatial dimensions and location of items Reflectivity of the optic nerve

Correct Answer:

Spatial dimensions and location of items

Explanation:

An A-scan in OCT is a one-dimensional depth profile along the light beam. It shows how strongly tissue reflects light as a function of depth, revealing the axial positions of internal interfaces and the distances between them. In other words, it provides the location of structures along the depth axis and their spacing for that single line. When many A-scans are collected across a region, you build up cross-sectional (and eventually 3D) images, but the fundamental information an A-scan gives is the depth-based spatial information of reflectors. It does not measure blood flow, and while you can infer thickness from the separation of boundaries seen in an A-scan, the core idea is the depth position of reflectors—i.e., the spatial dimensions along the beam.

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