In SD-OCT, what does SD stand for?

In SD-OCT, what does SD stand for?

• A. Spectral Domain
• B. Standard Diode
• C. Spatial Delay
• D. Scanned Depth

Answer: (A)

In SD-OCT, SD stands for Spectral Domain. The idea is that the depth information is encoded in the spectrum of the interference pattern between the sample and reference arms. A spectrometer captures this spectrum across wavelengths at once, and a Fourier transform with respect to wavenumber converts that spectral data into a depth-reflectivity profile (an A-scan). This lets you get depth information without moving the reference mirror, enabling faster imaging and better sensitivity roll-off than time-domain OCT. The other terms don’t represent how this modality is named in OCT. “Standard Diode,” “Spatial Delay,” or “Scanned Depth” aren’t the established descriptors for SD-OCT, and they don’t capture the spectral-detection principle that defines this approach.

In SD-OCT, SD stands for Spectral Domain. The idea is that the depth information is encoded in the spectrum of the interference pattern between the sample and reference arms. A spectrometer captures this spectrum across wavelengths at once, and a Fourier transform with respect to wavenumber converts that spectral data into a depth-reflectivity profile (an A-scan). This lets you get depth information without moving the reference mirror, enabling faster imaging and better sensitivity roll-off than time-domain OCT.

The other terms don’t represent how this modality is named in OCT. “Standard Diode,” “Spatial Delay,” or “Scanned Depth” aren’t the established descriptors for SD-OCT, and they don’t capture the spectral-detection principle that defines this approach.