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Ocular OCT retinal thickness map, right eye Time-domain OCT of the macular area of a retina at 800 nm, axial resolution 3 μm Spectral-domain OCT macula cross-section scan. Optical coherence tomography (OCT) is a technique for obtaining sub-surface images of translucent or opaque materials at a resolution equivalent to a low-power microscope.
SV-OCT can be done with spectral domain OCT (SD-OCT) and swept source OCT (SS-OCT). [5] SD-OCT and SS-OCT are both methods of Fourier domain OCT (FD-OCT), which has significantly faster image acquisition speed compared to time domain OCT. In general, OCT measures the echo time delay and intensity of reflected and backscattered light.
Both the spatial domain and spectral domain descriptions of the collected OCT signal, can be related by Fourier transformation: = | {()} | where is the Fourier transform. However, due to the wavelength dependence with depth for both scattering and absorption in tissue, direct Fourier transform cannot be applied to obtain localized spectroscopic ...
Spectral-Domain OCT macula cross-section scan. macula histology (OCT) A fundus photograph showing the macula as a spot to the left. The optic disc is the area on the ...
With the development of Fourier-domain OCT, spectral-domain OCT, and swept source signal acquisition time was greatly improved making OCTA possible. [40] OCTA scan time is now around three seconds, however, saccadic eye movement still causes a low signal-to-noise ratio.
Using optical coherence tomography (OCT), at least 13 layers can be identified in the retina. The layers and anatomical correlation are: [24] [25] [26] Time-Domain OCT of the macular area of a retina at 800 nm, axial resolution 3 μm Spectral-Domain OCT macula cross-section scan Macula histology (OCT)
DA-OCT applies a dual-axis architecture to a spectral-domain OCT system. The objective is to improve the depth of view within biological tissue. Dual-axis architecture with coherence imaging was introduced in the early 2010s.
The same disadvantages occur when using the spectrogram method to do in vivo tissue structure and flow velocity imaging, as spectral-domain OCT is limited to fast imaging. Phase-resolved Doppler OCT, based around the invention of Fourier-Domain OCT, was invented to overcome these limitations. [1]