Figure 1.

Ocular magnification affects transverse but not axial scaling. Arc length (s) of the imaged region is proportional to axial length (2r) for a given scan angle (θ). Dividing by J samples yields the transverse spatial scale (x). The maximum depth imaged (z_max) depends on the refractive index of the sample (n), center wavelength (λ₀), bandwidth (Δλ), and spectrometer sampling (N_S). Dividing z_max by the spectrometer sampling (N_F) yields the axial spatial scale, which transforms a distance measurement (z) from pixels to linear space (d). Note that only transverse scale depends on axial length.