Until recently, capturing the far periphery of the retina with OCT was nearly impossible. A depiction of these definitions appears in Figure 1. 1 This represents a 110 to 220-degree field of view. 1 It defined ultra-widefield imaging as an image of the far periphery of the retina, including the anterior edge of the vortex vein ampulla and beyond. In 2019, the International Widefield Imaging Study Group defined widefield imaging as a field of view of approximately 60 to 100 degrees, capturing the mid-periphery of the retina up to the posterior edge of the vortex vein ampulla. Demonstrated here are the demarcation boundaries described for the posterior pole, the mid-periphery and the far periphery. A single image from the International Widefield Imaging Study Group demonstrating the definition of widefield and ultra-widefield with reference to the vortex vein ampullae. In this literature review, we’ll outline four disease entities in which UWF-OCT has shown promise: retinal detachments pathological myopia peripheral retinal degenerations and choroidal pathologies, as well as highlight the uses of this modality in pediatrics and UWF-OCT angiography.įigure 1. With the advent of these UWF imaging modalities, many researchers have initiated studies investigating the utility of UWF-OCT imaging. In the course of its use and development, OCT technology has spawned widefield and ultra-widefield imaging methods that allow fields of view of up to 220 degrees. The ability of this technology to capture the peripheral retina has allowed for new and expanded clinical applications. Send us feedback about these examples.Since its inception in the 1990s, optical coherence tomography has become a crucial tool in the practice of ophthalmology by informing diagnosis, disease monitoring and long-term prognosis. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'tomography.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors.

James Riordon, Scientific American, 29 July 2022 Whether battery powered or plugged in, the most likely applications for this on-chip spectrometer will be in spectroscopic sensing, radio frequency spectrum analysis, and optical coherence tomography, which ophthalmologists use to image the different layers of a patient’s retina. Elise Cutts, Discover Magazine, 29 June 2023 These techniques have been known as muon tomography for three-dimensional imaging and muon radiography for two-dimensional imaging, but the term muography is more widely used for both techniques these days. Stuart Hershman, Verywell Health, 26 June 2023 With this beefed-up Irish seismic network and data from seismometers in Britain, Lebedev and his colleagues previously used surface wave tomography to map the thickness of the lithosphere in Britain and Ireland.

Pearse Keane, WIRED, 26 June 2023 This may involve an X-ray of the spine or computed tomography (CT) scan, in which multiple X-ray images are combined into a 3-D image. Sam Walters, Discover Magazine, 13 July 2023 New eye scanners called optical coherence tomography (OCT) devices are being deployed in every optometry practice, such as your local Specsavers or Vision Express. Kimberley Mok, Treehugger, 13 July 2023 And while brain scans such as computed tomography (CT) and magnetic resonance imaging (MRI) can indicate damage and deterioration in a person's brain, cerebrospinal fluid collections can indicate build-up of proteins associated with Alzheimer’s. Kaitlin Sullivan, Health, 26 July 2023 Interestingly, prior to construction, the company consulted with an arborist who used sonic tomography to test out which trees were the strongest and healthiest candidates for building a treehouse around. Recent Examples on the Web As of now, insurance typically does not cover the tests, nor another auxiliary test called a positron emission tomography (PET) scan, which can detect plaques in the brain that could signal dementia or Alzheimer’s disease.

Optical coherence tomography definition