![]() Table 1 enlists the major differences between each of them. To date we have crossed three milestones in the development of OCT technology. The spectral pattern of the interference between the sample and reference reflections is measured using a spectrometer. In SD-OCT, the reference mirror is kept stationary. Here the position of the reference mirror is kept constantly changing which limits the speed of scanning. ![]() The photodetector receives the interference signal. Here the beam splitter directs the 830 nm beam into the reference mirror and the area to be scanned. Schematic representation of the working principle of TD- OCT. The interference measured by the photodetector is then converted to an A-scan signal.įig 1a. When the distance between the light source and retinal tissue equals the distance between the light source and reference mirror, the reflected light and the reference mirror interacts to produce an interference pattern. TD- OCT employs near-infrared light for better penetration of ocular structures. OCTs operate on the principle of indirect low-coherence interferometry, in which a beam of light is directed into the retina, and the resulting back-scattered light travels an unknown distance to a detector, which is compared to a reference beam of a known length to calculate the echo time delay of light. This chapter describes the basics of OCT technology and its clinical applications in retinal disorders. Thus, OCT has revolutionized the practice of ophthalmology and, in particular the diagnosis and management of patients with retinal disease. With the introduction of Spectral/ Fourier Domain OCT (SD-OCT, FD-OCT) and Swept Source OCT (SS-OCT), there is greater tissue resolving power, significantly higher scan density, and faster data acquisition than original Time Domain OCT. Originally developed in 1991 by Huang et al, OCT technology has continually evolved and expanded within ophthalmologyand has been explored in a wide range of clinical applications. Optical Coherence Tomography is a powerful noninvasive imaging modality that performs high resolution, micron-scale, cross-sectional imaging of the retina.
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