OCT basics
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This document discusses optical coherence tomography (OCT), a technique that uses infrared light to generate high-resolution cross-sectional images of the retina. It describes the evolution of OCT technology from early time-domain OCT to current spectral-domain and swept-source OCT. Key differences are that spectral-domain OCT uses a spectrometer to measure light wavelengths, while swept-source OCT provides higher resolution due to longer wavelengths that penetrate tissue better. The document also outlines how OCT is used to image the macula, optic nerve, and retinal layers, and can evaluate conditions like macular thickness and ganglion cell loss.
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Optical coherence tomography (OCT) provides high-resolution cross-sectional images of the retina and anterior segment. It uses infrared light to create images with resolutions of 1-15 micrometers. Newer spectral domain OCTs image faster and with higher resolution compared to earlier time domain OCTs. OCT is used clinically to evaluate and monitor many ocular conditions like glaucoma and macular diseases. It allows detailed visualization of retinal layers and structures not possible through other imaging methods.
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OCT For Everyone..
OCT is a great technology,Many ophthalmologist find very difficult to understand it ,SO I have tired to simplify it as much as possible .Hope everyone can understand now onwards the basic about OCT .
Every feedback s most welcomed sothat i can improve further in coming days
Please email your feedback to me in the following address
yourgyanu@gmail.com
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Optical coherence tomography (OCT) provides high-resolution cross-sectional imaging of coronary arteries and atherosclerotic plaque. It uses near-infrared light instead of sound and has 10 times the resolution of intravascular ultrasound. OCT can image the vessel wall and identify clinically relevant features like fibrous caps, calcium, necrotic cores, inflammation, and thrombus. It allows assessment of atherosclerosis and plaque vulnerability in vivo with measurements like fibrous cap thickness. Clinical applications include evaluation of atherosclerosis, characterization of thin-capped fibroatheromas, and assessment of inflammation.
OCT
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses light to obtain high-resolution cross-sectional images of the retina and anterior segment. OCT of the retina provides images similar to a vertical biopsy under a microscope, with micron-level resolution. Applications of OCT include ophthalmology, dermatology, cardiology, endoscopy, and guided surgery. OCT measures reflected light using interferometry, similar to ultrasound but using light instead of sound. It has much higher resolution than ultrasound. OCT is useful for detailed imaging of the retina and anterior segment, while ultrasound can image deeper structures due to its ability to penetrate tissue.
Oct in post seg disorders
OCT allows for high-resolution cross-sectional imaging of the retina. It provides micron-level resolution, enabling visualization of the retinal layers. OCT is a non-contact, non-invasive technique useful for qualitative and quantitative analysis of the retina and monitoring of morphological changes. It can detect and measure retinal thickness, volume, and parameters like RNFL thickness. While it provides advantages over other modalities, OCT also has limitations like difficulty imaging through opaque media. It operates using low-coherence interferometry and is useful for evaluating a variety of posterior segment diseases.
oct-ujjval solanki
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses infrared light to generate high-resolution cross-sectional images of the retina and anterior segment of the eye. OCT works by measuring the echo time and intensity of reflected light to create digital representations of tissue structures. There are two main types - time domain OCT and spectral domain OCT. OCT is useful for diagnosing and monitoring many eye conditions, such as glaucoma, age-related macular degeneration, and diabetic retinopathy. It allows detailed visualization of the retina, optic nerve, macula, and anterior segment structures.
Optical coherence tomography
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses infrared light to generate high-resolution cross-sectional images of the retina and anterior segment of the eye. OCT operates similarly to ultrasound imaging except that it uses light instead of sound waves. The OCT scan provides qualitative and quantitative analysis of the retina by identifying layers and measuring thickness. It can detect various pathological structures and abnormalities and is useful for diagnosing and monitoring diseases like glaucoma. Anterior segment OCT also allows high-resolution imaging of the cornea and anterior chamber.
Optical Coherence Tomography(OCT) in posterior segment diseases
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses light to generate high-resolution cross-sectional images of the retina and optic nerve. It provides detailed visualization of retinal structures on a microscopic scale. OCT is useful for diagnosing and monitoring various posterior segment diseases. It allows differentiation between stages of macular hole, detection of epiretinal membranes, and identification of fluid associated with neovascular age-related macular degeneration. Advances in spectral domain OCT technology have improved imaging speed and resolution, enabling clearer visualization of small retinal structures and layers.
Optical coherence tomography
Optical Coherence Tomography (OCT) is a non-invasive imaging technique that examines living tissue using low coherence radiation. It provides high resolution cross-sectional images of the retina in real time. OCT allows for both qualitative and quantitative analysis of retinal thickness, volume, and nerve fiber layer thickness. Scans can be customized using different protocols like line, circle, or radial line scans to examine specific areas of interest like the macula or optic nerve.
Optical Coherence Tomography
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses light to generate high-resolution cross-sectional images of the retina and anterior segment of the eye. OCT was invented in 1991 and has since advanced from time domain to spectral domain and swept-source versions with higher speed and resolution. It works by measuring the echo time delay and intensity of backscattered light to create images, and can qualitatively and quantitatively assess retinal thickness, layers, and pathology. OCT has numerous clinical applications in ophthalmology for diseases of the retina, choroid and anterior segment.
20120927 台科大 oct原理及在眼科的應用 (1)
1) The document discusses OCT technology, including its principles and history of development. OCT uses low coherence interferometry to perform high-resolution cross-sectional imaging of biological tissues.
2) Time-domain OCT was initially developed but newer Fourier-domain OCT provides faster acquisition speed and higher resolution.
3) The document reviews various clinical applications of OCT in ophthalmology, including imaging of the retina, glaucoma, cornea, and cataracts. Common scanning patterns and what can be observed are described for retinal and glaucoma examination.
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Optical Coherence Tomography(OCT) in posterior segment diseases
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OCT basics
- 1. By Ahmed Elsheemy, M.Sc. Ophthalmology Retinal OCT
- 2. Learning objectives • To know what is OCT • To know types of OCT imaging • To know how to describe OCT image • To recognize the anatomy of OCT out print
- 3. Optical Coherence Tomography (OCT) It’s an optical analog of ultrasound imaging that uses infrared light from a super-luminescent diode
- 4. The stages of evolution of various types of OCT : • The original time-domain (TD-OCT) • Spectral domain (SD-OCT) • Swept-source OCT (SS-OCT)
- 5. Time domain OCT • Compares a reflected beam of light to a beam of light from a reference mirror. • Time delays between the two beams can then be measured.
- 6. Spectral domain OCT This technique uses a spectrometer to measure the difference in wavelength between the light from the fixed reference arm and that returning from the tissue. The instrument analyze the image according to the light wavelength recorded.
- 7. Swept source OCT The Swept Source OCT is a huge improvement compared to Spectral Domain OCT. In Swept Source, considerable additional details can be seen due to higher wavelength. Besides that, this wavelength penetrates more easily through cataracts and hemorrhages.
- 14. • Cellular layers The ganglion cell layer, inner nuclear layer and outer nuclear layer that are mainly comprised of neuronal cell bodies are weakly reflective. • The RPE highly reflective even though it is made up of cells due to its content of melanin pigments.
- 16. How to describe OCT image ? • Reflectivity • Location
- 17. Reflectivity of different media
- 19. OCT imaging • Macula • Optic nerve • OCT angiography
- 21. OCT macula
- 22. Common modes of OCT imaging Macula Macular cube radial line scans raster line scans
- 26. OCT Optic disc
- 29. OCT GCL analysis
- 30. OCT angiography
- 31. Test your knowledge Describe these OCT.. Name Here Programmer Name Here Programmer
- 32. Test your knowledge Describe these OCT.. Name Here Programmer Name Here Programmer
- 33. Test your knowledge Describe these OCT.. Name Here Programmer Name Here Programmer
- 34. Test your knowledge Describe these OCT.. Name Here Programmer Name Here Programmer
- 35. Test your knowledge Describe these OCT.. Name Here Programmer Name Here Programmer
- 36. Test your knowledge Describe these OCT.. Name Here Programmer Name Here Programmer
- 37. Thanks for your attention