Published on 09/05/2015 by admin
Filed under Opthalmology
Last modified 09/05/2015
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Optical coherence tomography (OCT) is a medical diagnostic imaging technology that captures micron resolution three-dimensional images. It is based on the principle of optical reflectometry, which involves the measurement of light back-scattering through transparent or semi-transparent media such as biological tissues. It achieves this by measuring the intensity and the echo time delay of light that is scattered from the tissues of interest. Light from a broadband light source is broken into two arms, a reference arm and a sample arm that is reflected back from structures at various depths within the posterior pole of the eye.
There are two main ways in which the backscattered light can be detected:
▶ Time domain (TD) detection
▶ Fourier domain (FD) detection – which is further broken down into:
• Spectral domain (SD)
• Swept source (SS)
Handbook of Retinal OCT Optical Coherence Tomography
