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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, which provide higher resolution and allow visualization of additional retinal layers and features. The document also outlines how to describe OCT images and analyze features such as retinal thickness, optic nerve structure, and blood vessel networks visible on OCT angiography scans.
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OCT MACULA INTERPRETATION.
This presentation is mainly focused on the clinical diagnosis and interpretation of oct macula.This is presented on 4th year optometry as topic presentation.
Oct
OCT provides high-resolution, cross-sectional images of the retina and anterior eye using low-coherence interferometry. It allows detection of morphological changes and measurement of retinal thickness, volume, and nerve fiber layer thickness. Newer variants such as ultra-high resolution OCT, Doppler OCT, and anterior segment OCT provide additional structural and functional information. OCT is a non-invasive imaging technique that has become an essential tool for diagnosing and managing retinal diseases.
Final oct
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.
Oct introduction
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses light to capture high-resolution cross-sectional images of the retina. OCT was introduced in 1991 and has since become a widely used tool for ophthalmic diagnosis. It provides 10 micrometer resolution images, allowing visualization of individual retinal layers. Several technological advancements, including Fourier-domain OCT and swept-source OCT, have improved imaging speeds and depths. OCT angiography allows visualization of the retinal and choroidal vasculature without dyes. Precise quantitative and qualitative analysis of OCT images provides crucial information for diagnosing and monitoring many retinal conditions.
OPTICAL COHERENCE DEMYSTIFIED
OCT provides high-resolution, cross-sectional imaging of the retina and anterior segment of the eye in a non-invasive manner. It works on the principles of interferometry and low coherence reflectometry to obtain micrometer-level resolution images. Time domain OCT uses a moving reference mirror while Fourier domain OCT obtains entire scans simultaneously using a spectrometer. OCT is useful for diagnosing and monitoring various retinal diseases like macular edema, glaucoma, age-related macular degeneration and corneal pathologies by visualizing intraretinal layers and thickness maps. It has become the gold standard for evaluation and management of diseases affecting the retina.
OCT Machines
Optical coherence tomography (OCT) uses interferometry to produce high-resolution, cross-sectional images of internal structures in biological tissues. There are two main types of OCT machines: time-domain OCT, which was initially developed and has slower scanning; and spectral-domain OCT, which has faster scanning speeds, better resolution, and allows motion artifact reduction. A commonly used spectral-domain OCT machine is the Heidelberg Engineering Spectralis, which can perform up to 40,000 scans per second and incorporates eye-tracking, simultaneous multimodal imaging, and enhanced depth imaging of choroidal structures.
Oct demystified
Optical coherence tomography (OCT) is a noninvasive imaging technique that uses light waves to examine ocular structures with micrometer resolution. OCT works similarly to ultrasound but uses light instead of sound. By analyzing reflected light waves, an OCT can construct a depth profile of tissue structures. OCT provides high-resolution evaluation of retinal layers and pathology. It is useful for diagnosing and monitoring diseases like diabetic retinopathy. OCT imaging involves A-scans that are combined to form B-scans and 3D volumes. Spectral domain OCT has replaced time domain OCT due to improved sensitivity and speed. OCT is useful for classifying and monitoring diabetic macular edema and other retinal diseases.
Optical coherence tomography(OCT) --macula
Optical coherence tomography (OCT) provides high-resolution cross-sectional images of the retina using infrared light. It has advanced from time domain OCT to spectral domain OCT, improving resolution and scan speed. OCT is used to qualitatively and quantitatively analyze retinal thickness, layers, and structures. It is useful for diagnosing and monitoring many retinal conditions like macular holes, edema, age-related macular degeneration, and more. Artifacts can occur but OCT provides crucial information with advantages of being non-invasive and having micron-level resolution.
Recommended
OCT MACULA INTERPRETATION.
This presentation is mainly focused on the clinical diagnosis and interpretation of oct macula.This is presented on 4th year optometry as topic presentation.
Oct
OCT provides high-resolution, cross-sectional images of the retina and anterior eye using low-coherence interferometry. It allows detection of morphological changes and measurement of retinal thickness, volume, and nerve fiber layer thickness. Newer variants such as ultra-high resolution OCT, Doppler OCT, and anterior segment OCT provide additional structural and functional information. OCT is a non-invasive imaging technique that has become an essential tool for diagnosing and managing retinal diseases.
Final oct
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.
Oct introduction
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses light to capture high-resolution cross-sectional images of the retina. OCT was introduced in 1991 and has since become a widely used tool for ophthalmic diagnosis. It provides 10 micrometer resolution images, allowing visualization of individual retinal layers. Several technological advancements, including Fourier-domain OCT and swept-source OCT, have improved imaging speeds and depths. OCT angiography allows visualization of the retinal and choroidal vasculature without dyes. Precise quantitative and qualitative analysis of OCT images provides crucial information for diagnosing and monitoring many retinal conditions.
OPTICAL COHERENCE DEMYSTIFIED
OCT provides high-resolution, cross-sectional imaging of the retina and anterior segment of the eye in a non-invasive manner. It works on the principles of interferometry and low coherence reflectometry to obtain micrometer-level resolution images. Time domain OCT uses a moving reference mirror while Fourier domain OCT obtains entire scans simultaneously using a spectrometer. OCT is useful for diagnosing and monitoring various retinal diseases like macular edema, glaucoma, age-related macular degeneration and corneal pathologies by visualizing intraretinal layers and thickness maps. It has become the gold standard for evaluation and management of diseases affecting the retina.
OCT Machines
Optical coherence tomography (OCT) uses interferometry to produce high-resolution, cross-sectional images of internal structures in biological tissues. There are two main types of OCT machines: time-domain OCT, which was initially developed and has slower scanning; and spectral-domain OCT, which has faster scanning speeds, better resolution, and allows motion artifact reduction. A commonly used spectral-domain OCT machine is the Heidelberg Engineering Spectralis, which can perform up to 40,000 scans per second and incorporates eye-tracking, simultaneous multimodal imaging, and enhanced depth imaging of choroidal structures.
Oct demystified
Optical coherence tomography (OCT) is a noninvasive imaging technique that uses light waves to examine ocular structures with micrometer resolution. OCT works similarly to ultrasound but uses light instead of sound. By analyzing reflected light waves, an OCT can construct a depth profile of tissue structures. OCT provides high-resolution evaluation of retinal layers and pathology. It is useful for diagnosing and monitoring diseases like diabetic retinopathy. OCT imaging involves A-scans that are combined to form B-scans and 3D volumes. Spectral domain OCT has replaced time domain OCT due to improved sensitivity and speed. OCT is useful for classifying and monitoring diabetic macular edema and other retinal diseases.
Optical coherence tomography(OCT) --macula
Optical coherence tomography (OCT) provides high-resolution cross-sectional images of the retina using infrared light. It has advanced from time domain OCT to spectral domain OCT, improving resolution and scan speed. OCT is used to qualitatively and quantitatively analyze retinal thickness, layers, and structures. It is useful for diagnosing and monitoring many retinal conditions like macular holes, edema, age-related macular degeneration, and more. Artifacts can occur but OCT provides crucial information with advantages of being non-invasive and having micron-level resolution.
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
Recent advances in ophthalmology - Dr. Parag Apte
This document summarizes recent advances in ophthalmology, focusing on the use of lasers. It describes different types of lasers used in ophthalmology like excimer, Nd:YAG, and diode lasers. Applications discussed include refractive surgery procedures like LASIK, treatment of retinal diseases using photocoagulation, capsulotomy for posterior capsule opacification, and trans-scleral cyclophotocoagulation for glaucoma. Diagnostic tools using lasers that are summarized are scanning laser ophthalmoscopy, optical coherence tomography, and wavefront analysis.
Principles of optical coherence tomography
OCT uses interferometry to perform non-invasive imaging of biological tissues. The first OCT images of the retina were obtained in 1990. Time domain OCT works by scanning a reference mirror to measure echo time delays, while Fourier domain OCT measures spectral interference patterns without scanning. Fourier domain OCT allows for much faster acquisition speeds compared to time domain OCT. Integrating OCT with scanning laser ophthalmoscopy enables localization of OCT scans on fundus images.
OCT
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.
Role of oct in glaucoma
Optical coherence tomography (OCT) is useful for imaging both the anterior and posterior segments in glaucoma. Posterior segment OCT allows quantification of retinal nerve fiber layer thickness, optic nerve head parameters, and ganglion cell layer thickness. Changes in these measurements over time can help detect glaucomatous progression. Anterior segment OCT visualizes angle anatomy and structures after glaucoma surgery. OCT provides objective data but results must be interpreted carefully while considering limitations such as variability between devices and lack of representation in normative databases.
Optical/ocular coherence tomography OCT All in one Presentation
age-related macular degeneration (amd), anterior segment, diabetic eye disease., exudative macular degeneration, glaucoma, imaging technique, indications, introduction of oct, macular degeneration (amd) and, michelson interferometry, normal retinal scan, ocular coherence tomography, principle of oct, reflectivity of images, reflectivity patterns of the retinal structures a, report analysis, retina, spectral-domain oct (sdoct)., subretinal neovascular membranes, time-domain oct (tdoct)
Optical coherence tomography
optical coherence tomography is a new tool that makes retinal diagnosis easier. the above ppt includes a detailed and precise notes on OCT and its interpretation.
Oct(optical cohorence tomography)
1. Optical coherence tomography (OCT) is a non-invasive imaging technique that uses near-infrared light to capture back-scattered light from biological tissues and create cross-sectional images.
2. There are two main types of OCT - time domain OCT which uses a moving reference mirror, and Fourier domain OCT which uses a spectrometer to measure spectral modulations and generate images faster without moving parts.
3. Spectral OCT combines OCT with scanning laser ophthalmoscopy to simultaneously produce high-resolution cross-sectional and en face fundus images, allowing clinicians to better localize pathological features.
Oct
Optical coherence tomography (OCT) provides high resolution, cross-sectional images of the retina. OCT uses light waves to generate tomographic scans. Early OCT systems had axial resolutions of 10 μm and scan speeds of 400 scans/second. Newer spectral domain OCT systems have higher resolutions of 1-15 μm and faster scan speeds of up to 52,000 scans/second, allowing better visualization of retinal layers and pathology. OCT is used to qualitatively and quantitatively evaluate retinal morphology and thickness.
OCT slides
An introduction to the basics of OCT technology and basic interpretation of OCT. Ideal for Cardiology fellows and cardiovascular technologists.
OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY
OCT angiography allows visualization of the retinal and choroidal vasculature without dye injection. It uses amplitude decorrelation and phase variance techniques to detect blood flow. The retina and choroid can be segmented into different en face slabs. The superficial, deep, and outer retinal plexuses as well as the choriocapillaris can be visualized. OCTA is useful for diagnosing wet AMD by detecting type 1 CNV beneath the RPE that may not be clearly seen on FA. It can help classify CNV shape and branching patterns. Motion artifacts and projection artifacts can occur but many devices have correction software.
Optical coherence tomography in Ophthalmology.pptx
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses interferometry to produce high-resolution cross-sectional images of the retina and other ocular structures. There are several types of OCT including time domain OCT, spectral domain OCT, and swept source OCT, with spectral domain OCT providing the best resolution. OCT allows visualization and measurement of retinal layers and structures, and can identify pathologies by their characteristic findings, aiding in diagnosis of conditions like macular holes, drusen, geographic atrophy, and diabetic retinopathy.
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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
Recent advances in ophthalmology - Dr. Parag Apte
This document summarizes recent advances in ophthalmology, focusing on the use of lasers. It describes different types of lasers used in ophthalmology like excimer, Nd:YAG, and diode lasers. Applications discussed include refractive surgery procedures like LASIK, treatment of retinal diseases using photocoagulation, capsulotomy for posterior capsule opacification, and trans-scleral cyclophotocoagulation for glaucoma. Diagnostic tools using lasers that are summarized are scanning laser ophthalmoscopy, optical coherence tomography, and wavefront analysis.
Principles of optical coherence tomography
OCT uses interferometry to perform non-invasive imaging of biological tissues. The first OCT images of the retina were obtained in 1990. Time domain OCT works by scanning a reference mirror to measure echo time delays, while Fourier domain OCT measures spectral interference patterns without scanning. Fourier domain OCT allows for much faster acquisition speeds compared to time domain OCT. Integrating OCT with scanning laser ophthalmoscopy enables localization of OCT scans on fundus images.
OCT
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.
Role of oct in glaucoma
Optical coherence tomography (OCT) is useful for imaging both the anterior and posterior segments in glaucoma. Posterior segment OCT allows quantification of retinal nerve fiber layer thickness, optic nerve head parameters, and ganglion cell layer thickness. Changes in these measurements over time can help detect glaucomatous progression. Anterior segment OCT visualizes angle anatomy and structures after glaucoma surgery. OCT provides objective data but results must be interpreted carefully while considering limitations such as variability between devices and lack of representation in normative databases.
Optical/ocular coherence tomography OCT All in one Presentation
age-related macular degeneration (amd), anterior segment, diabetic eye disease., exudative macular degeneration, glaucoma, imaging technique, indications, introduction of oct, macular degeneration (amd) and, michelson interferometry, normal retinal scan, ocular coherence tomography, principle of oct, reflectivity of images, reflectivity patterns of the retinal structures a, report analysis, retina, spectral-domain oct (sdoct)., subretinal neovascular membranes, time-domain oct (tdoct)
Optical coherence tomography
optical coherence tomography is a new tool that makes retinal diagnosis easier. the above ppt includes a detailed and precise notes on OCT and its interpretation.
Oct(optical cohorence tomography)
1. Optical coherence tomography (OCT) is a non-invasive imaging technique that uses near-infrared light to capture back-scattered light from biological tissues and create cross-sectional images.
2. There are two main types of OCT - time domain OCT which uses a moving reference mirror, and Fourier domain OCT which uses a spectrometer to measure spectral modulations and generate images faster without moving parts.
3. Spectral OCT combines OCT with scanning laser ophthalmoscopy to simultaneously produce high-resolution cross-sectional and en face fundus images, allowing clinicians to better localize pathological features.
Oct
Optical coherence tomography (OCT) provides high resolution, cross-sectional images of the retina. OCT uses light waves to generate tomographic scans. Early OCT systems had axial resolutions of 10 μm and scan speeds of 400 scans/second. Newer spectral domain OCT systems have higher resolutions of 1-15 μm and faster scan speeds of up to 52,000 scans/second, allowing better visualization of retinal layers and pathology. OCT is used to qualitatively and quantitatively evaluate retinal morphology and thickness.
OCT slides
An introduction to the basics of OCT technology and basic interpretation of OCT. Ideal for Cardiology fellows and cardiovascular technologists.
OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY
OCT angiography allows visualization of the retinal and choroidal vasculature without dye injection. It uses amplitude decorrelation and phase variance techniques to detect blood flow. The retina and choroid can be segmented into different en face slabs. The superficial, deep, and outer retinal plexuses as well as the choriocapillaris can be visualized. OCTA is useful for diagnosing wet AMD by detecting type 1 CNV beneath the RPE that may not be clearly seen on FA. It can help classify CNV shape and branching patterns. Motion artifacts and projection artifacts can occur but many devices have correction software.
Optical coherence tomography in Ophthalmology.pptx
Optical coherence tomography (OCT) is a non-invasive imaging technique that uses interferometry to produce high-resolution cross-sectional images of the retina and other ocular structures. There are several types of OCT including time domain OCT, spectral domain OCT, and swept source OCT, with spectral domain OCT providing the best resolution. OCT allows visualization and measurement of retinal layers and structures, and can identify pathologies by their characteristic findings, aiding in diagnosis of conditions like macular holes, drusen, geographic atrophy, and diabetic retinopathy.
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oct presentation.pptx
- 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