allowing the light to penetrate into the sample. The OCT system collects and measures the light backscattered by the surface and sub-surface features located along the path of the probe. The backscattered [...] profile. 2D and 3D images are obtained by scanning the OCT light probe across the surface of the sample while collecting the measured A-Scans into datasets. The 2D scan that produces a cross-sectional image [...] features in the sample. To collect a 1D depth scan, often called an A-Scan, the light emitted by the OCT light source is focused to a small diameter spot, positioned on the specimen, and held stationary
https://www.lfm.uni-rostock.de/en/equipment/analyse/ganymedetm-series-oct/