Optical coherence tomography
A technique known as optical coherence pictorial representation (OCT) has been developed for noninvasive cross-sectional imaging in biological systems. October uses low-coherence interferometry to supply a two-dimensional image of optical scattering from internal tissue microstructures in an exceedingly approach that’s analogous to unhearable pulse-echo imaging. October has longitudinal and lateral spatial resolutions of some micrometers and might sight mirrored signals as little as roughly 10(-10) of the incident optical power. Tomographic imaging is incontestable in vitro within the peripapillary space of the tissue layer and within the arterial blood vessel, 2 clinically relevant examples that area unit representative of clear and muddy media, severally. [1]
Imaging of Macular Diseases with Optical Coherence Tomography
Background/Purpose: To assess the potential of a replacement diagnostic procedure known as optical coherence pictorial representation for imaging macular malady. Optical coherence pictorial representation could be a novel noninvasive, noncontact imaging modality that produces high depth resolution (10 μm cross-sectional tomographs of ocular tissue. it’s analogous to ultrasound, except that optical instead of acoustic reflectivity is measured. [2]
Optical coherence-domain reflectometry: a new optical evaluation technique
An optical analysis technique is delineated that’s appropriate for decisive the positions and magnitudes of reflection sites at intervals miniature optical assemblies. This technique utilizes the coherence effects exhibited by a broadband optical supply and is named as optical coherence-domain reflectometry. Background theory is given, associated experimental results have incontestible a resolution of ten μm with an optical dynamic vary of over a hundred dB. [3]
Comparison of ocular biometric measurements between a new swept-source optical coherence tomography and a common optical low coherence reflectometry
The purpose of this study was to match the measurements between a brand new optical biometer supported swept-source optical coherence imaging (SS-OCT), the OA-2000 (Tomey, Japan), associated an optical biometer supported optical low coherence reflectometry (OLCR), the Lenstar (Haag-Streit, Switzerland). 99 eyes of ninety nine healthy subjects were enclosed. The axial length (AL), central tissue layer thickness (CCT), anterior chamber depth (ACD), liquid depth (AD), lens thickness (LT), keratometry (K) readings, as well as flat K (Kf), steep K (Ks), mean K (Km), astigmatism vectors J0, J45 at diameters of two.5 and 3.0 mm, and white-to-white diameter (WTW) were measured thrice every victimisation each biometer in traditional eyes by random sequence. [4]
Optical Coherence Tomography Findings of Diabetic Maculopathy in Egypt
Aim of the Work: to guage the diagnostic perform of Optical Coherence imaging (OCT) in diabetic maculopathy and therefore the most important and customary October findings.
Patients and Methods: This study was a prospective, non-comparative, non-interventional, case series, administered between Gregorian calendar month 2015 to March 2017 and enclosed five hundred eyes of 287 diabetic patients with diabetic maculopathy. Their retinas were assessed and classified in step with October findings of retinal thickness, retinal morphology, retinal topography, macular traction, and foveal photoreceptor standing. [5]
Reference
[1] Huang, D., Swanson, E.A., Lin, C.P., Schuman, J.S., Stinson, W.G., Chang, W., Hee, M.R., Flotte, T., Gregory, K. and Puliafito, C.A., 1991. Optical coherence tomography. science, 254(5035), (Web Link)
[2] Puliafito, C.A., Hee, M.R., Lin, C.P., Reichel, E., Schuman, J.S., Duker, J.S., Izatt, J.A., Swanson, E.A. and Fujimoto, J.G., 1995. Imaging of macular diseases with optical coherence tomography. Ophthalmology, 102(2), (Web Link)
[3] Youngquist, R.C., Carr, S. and Davies, D.E., 1987. Optical coherence-domain reflectometry: a new optical evaluation technique. Optics letters, 12(3), (Web Link)
[4] Comparison of ocular biometric measurements between a new swept-source optical coherence tomography and a common optical low coherence reflectometry
Rongrong Gao, Hao Chen, Giacomo Savini, Yaxin Miao, Xiaorui Wang, Jing Yang, Weiqi Zhao, Qinmei Wang & Jinhai Huang
Scientific Reports volume 7, (Web Link)
[5] Abdeen, G., Radwan, G., Elagouz, M. and Farouk, M. (2019) “Optical Coherence Tomography Findings of Diabetic Maculopathy in Egypt”, Ophthalmology Research: An International Journal, 9(4), (Web Link)
