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Open AccessJournal ArticleDOI

Optical coherence tomography

TLDR
OCT as discussed by the authors uses low-coherence interferometry to produce a two-dimensional image of optical scattering from internal tissue microstructures in a way analogous to ultrasonic pulse-echo imaging.
Abstract
A technique called optical coherence tomography (OCT) has been developed for noninvasive cross-sectional imaging in biological systems. OCT uses low-coherence interferometry to produce a two-dimensional image of optical scattering from internal tissue microstructures in a way that is analogous to ultrasonic pulse-echo imaging. OCT has longitudinal and lateral spatial resolutions of a few micrometers and can detect reflected signals as small as approximately 10(-10) of the incident optical power. Tomographic imaging is demonstrated in vitro in the peripapillary area of the retina and in the coronary artery, two clinically relevant examples that are representative of transparent and turbid media, respectively.

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Journal ArticleDOI

Assessment of coronary plaque collagen with polarization sensitive optical coherence tomography (PS-OCT)

TL;DR: The capability of PS-OCT to assess plaque collagen content, in addition to its ability to generate high resolution structural assessments, make it a potentially powerful technology for identifying high risk plaques.
Journal ArticleDOI

A two-axis electrothermal micromirror for endoscopic optical coherence tomography

TL;DR: In this paper, a 1-mm/sup 2/2/2 2/3/2-axis, single-crystalline-silicon (SCS)-based aluminum-coated scanning micromirror with large rotation angle (up to 40/spl deg/), which can be used in an endoscopic optical coherence tomography imaging system is presented.
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Dynamic light scattering optical coherence tomography

TL;DR: An integration of dynamic light scattering (DLS) and optical coherence tomography (OCT) for high-resolution 3D imaging of heterogeneous diffusion and flow is introduced and a fitting algorithm is developed to estimate dynamic parameters including the axial and transverse velocities and the diffusion coefficient.
Journal ArticleDOI

Investigation of the mesoscale structure and volumetric features of biofilms using optical coherence tomography

TL;DR: It is shown that CLSM images do not necessarily provide an accurate representation of the biofilm structure at the mesoscale, and the typical characteristic parameters obtained from CLSM image stacks differ largely from those calculated from OCT images.
Journal ArticleDOI

Retinal nerve fibre layer thickness measurement reproducibility improved with spectral domain optical coherence tomography

TL;DR: SD-OCT 3D cube data generally showed better RNFL measurement reproducibility than TD-O CT, and two methods defining the optic nerve head (ONH) centring: Centred Each Time (CET) vs Centred Once (CO), in terms of RNFL thickness measurement variability on SD- OCT.
References
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Journal ArticleDOI

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TL;DR: A technique in which X-ray transmission readings are taken through the head at a multitude of angles: from these data, absorption values of the material contained within the head are calculated on a computer and presented as a series of pictures of slices of the cranium.
Journal ArticleDOI

Clinically detectable nerve fiber atrophy precedes the onset of glaucomatous field loss.

TL;DR: Nerve fiber layer defects expanded with time, often by the development and coalescence of adjacent areas of damage, and field defects closely corresponded, but nerve fiber layer loss was generally more widespread.
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Retinal ganglion cell atrophy correlated with automated perimetry in human eyes with glaucoma.

TL;DR: Estimates suggest that visual field sensitivity in automated testing begins to decline soon after the initial loss of ganglion cells in human eyes with glaucoma, and that this decline is most pronounced in areas that had 0-dB sensitivity in the field test.
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