• The objective of this study is to present the reliability and validity of scanning laser Doppler flowmetry (SLDF) performing a high-definition topography of perfused vessels of the retina and the optic nerve head with simultaneous evaluation of blood flow. (nih.gov)
  • SLDF enables the visualization of perfused vessels of the juxtapapillary retina and the optic nerve head in high resolution by two-dimensional mapping of the optical Doppler shift and a reproducible evaluation of capillary blood flow. (nih.gov)
  • Optic nerve head and/or retinal nerve fiber analysis may be helpful in diagnosing and monitoring progression of glaucomatous optic neuropathy. (medscape.com)
  • Analyze optic nerve head with confocal scanning laser ophthalmoscopy (SLO), eg, Heidelberg Retinal Tomograph, or optical coherence topography (OCT). (medscape.com)
  • Recently, ophthalmologists are able to qualify and quantify the retinal capillary network and choriocapillaries, optic nerve head, and corneal peripheral nerves. (arvojournals.org)
  • OCT for optic nerve head analysis. (riokolkata.in)
  • However, macroaneurysms also have been reported in cilioretinal arteries, on the optic nerve head, and associated with congenital retinal macrovessels. (medscape.com)
  • The Glaucoma Module Premium Edition provides a comprehensive and personalized analysis of the optic nerve head, retinal nerve fiber layer, and macular ganglion cell layer by precisely matching unique scan patterns to the fine anatomic structures relevant in glaucoma diagnostics. (heidelbergengineering.com)
  • Gibson stressed the importance of optic flow for affordance perception, the ability to discern possibilities for action within the environment. (wikipedia.org)
  • This set-up opens up new opportunities for investigations of information processing in navigation (e.g. the importance of optic flow or vestibular input). (biologists.com)
  • While all proposed mechanisms attempt to reconcile the classical constellation of SANS-defining signs, including hyperopic shift, choroidal & retinal folds, cotton-wool spots, optic disc edema, optic nerve sheath distension, and globe flattening) [3] , only few can harmonize a sound solution without intruding on closely-related disease processes. (aao.org)
  • He told delegates that optic disc oedema, globe flattening, choroidal folds, cotton wool spots and RNFL thickening had all been detected and are being carefully monitored. (visionplusmag.com)
  • The study selection process yielded the inclusion of 18 studies with a total of 1552 evaluated eyes in 673 MS-associated optic neuritis (MSON) eyes, 741 MS without optic neuritis (MSNON eyes), and 138 eyes without specification for the presence of optic neuritis (ON) in addition to 1107 healthy control (HC) eyes. (biomedcentral.com)
  • Allowing to monitor changes in the retina of patients with optic neuropathies and neurodegenerative process including, but not limited to Multiple Sclerosis, Parkinson's Disease and Alzheimer's Disease. (heidelbergengineering.com)
  • Second, comparative measurements were performed of retinal blood flow in normal eyes and in 33 glaucomatous eyes with SLDF and a commercially available single-point laser Doppler flowmeter (Oculix). (nih.gov)
  • Multifocal electroretinograms (mfERGs) provides an index of identification for a glaucomatous optic neuropathy in normal-tension glaucoma. (medscape.com)
  • The optical flow methods try to calculate the motion between two image frames which are taken at times t {\displaystyle t} and t + Δ t {\displaystyle t+\Delta t} at every voxel position. (wikipedia.org)
  • All optical flow methods introduce additional conditions for estimating the actual flow. (wikipedia.org)
  • The optimal solution is often recovered through Max-flow min-cut theorem algorithms, linear programming or belief propagation methods. (wikipedia.org)
  • Cerebral blood flow (CBF) is reduced and autoregulation impaired in sepsis, but current methods to image CBF do not reproducibly assess the microcirculation. (springeropen.com)
  • The study includes all the major developments in the past years describing the key attributes of unidirectional flow networks, including their applications, scope, and routing methods. (jips-k.org)
  • This eventually help researchers to develop new algorithms related to unidirectional transmission, flow, traffic, and routing methods. (jips-k.org)
  • This systematic review and meta-analysis of the studies reporting OCT-A measurements of people with MS confirmed the tendency of MS eyes to exhibit reduced vessel density in the macular and optic disc areas, mainly in SCP, DCP, and RPC vessel densities. (biomedcentral.com)
  • Monitoring microcirculatory flow offers the potential to enhance monitoring in the care of critically ill patients, and imaging retinal blood flow during critical illness offers a potential biomarker for cerebral microcirculatory perfusion. (springeropen.com)
  • This review discusses the relationship between cerebral and retinal blood flow, and the relevance of that relationship to systemic pathology and monitoring microcirculatory perfusion in critical illness, focussing more on sepsis. (springeropen.com)
  • To find the optical flow another set of equations is needed, given by some additional constraint. (wikipedia.org)
  • Hands-on flow cytometry: learning by doing! (embl.org)
  • Flow cytometry is a highly effective method for analysing individual cells that has become widely used in the fields of life sciences and medicine. (embl.org)
  • By utilising flow cytometry, researchers can accurately identify and measure specific cell populations within complex mixtures, as well as assess cell cycle progression, proliferation status, and expression of fluorescent markers. (embl.org)
  • Our course aims to provide a comprehensive understanding of the underlying principles of flow cytometry, while also emphasising practical considerations related to the most frequently used assays. (embl.org)
  • Through a combination of theoretical instruction and hands-on training, students will gain the knowledge and skills necessary to effectively design, execute, and interpret flow cytometry experiments. (embl.org)
  • Prior basic working knowledge of flow cytometry, data acquisition or analysis software (DIVA + FlowJo) is of advantage, but not strictly a must. (embl.org)
  • It is a must for everyone interested in basic and more specific aspects of flow cytometry techniques. (embl.org)
  • njoyed the course a lot and learned what I was looking for: an opportunity to learn the principles of flow cytometry that are important for planning and performing experiments. (embl.org)
  • Given that the eye possesses clear optics and shares many neural and vascular similarities to the brain, it offers a direct window to cerebral pathology. (frontiersin.org)
  • Neural signals from the rods and cones undergo processing by other neurons, whose output takes the form of action potentials in retinal ganglion cells whose axons form the optic nerve. (wikipedia.org)
  • Although the overlying neural tissue is partly transparent, and the accompanying glial cells have been shown to act as fibre-optic channels to transport photons directly to the photoreceptors, [7] [8] light scattering does occur. (wikipedia.org)
  • This can be attached to the ultra-high magnification capillary scope GOKO Bscan-Z, which non-invasively observes the shape and flow of skin capillaries in the whole body. (thebusinessresearchcompany.com)
  • Apart from having best storage facilities for donated corneas, it is having keratoanalyser for specular count of the donated corneal buttons, Slit lamp microscope, laminar air flow, Refrigerators for storing blood samples, tissues and storage media, serology equipment and Autoclave or gas sterilizer. (riokolkata.in)
  • The evening commenced with Dr Stephan Schultz, Head of the Heidelberg Engineering Academy, outlining the NASA ocular health study and use of the Spectralis OCT to monitor the retina of astronauts taking part in missions to the international space station (ISS). (visionplusmag.com)
  • Peripheral microcirculatory blood flow may be imaged in sublingual and conjunctival mucosa and is impaired in sepsis. (springeropen.com)
  • 3D Spectralis OCT (Heidelberg) Scanning laser spectral domain optical coherence tomography, the latest state of the art imaging technology is now available at RIO Kolkata. (riokolkata.in)
  • Erythrocyte sedimentation rate (ESR) rarely is elevated in low-tension glaucoma and typically is obtained in cases of decreased central acuity with a pale nerve to rule out anterior ischemic optic neuropathy (AION). (medscape.com)
  • 4. F. Fagnola , R. Rebolledo , An ergodic theorem in quantum optics , 1995, à paraître dans les actes du colloque en honneur de A. Frigerio , publiées par l'Université d'Udine. (numdam.org)
  • 00:01:48.10 which runs with a laminar flow, 00:01:50.02 transporting forward a certain volume in a certain time. (ibiology.org)
  • 00:02:27.19 So, if we have an efflux from the system, 00:02:29.23 like a tube, or basically a flow cuvette, 00:02:32.04 we're generating in this small canal, 00:02:36.00 down here, a so-called laminar flow. (ibiology.org)
  • 00:02:39.06 Now, in the case of a flow cytometer, 00:02:41.15 this laminar flow is. (ibiology.org)
  • 00:02:53.24 Now, we're creating the laminar flow up in front here. (ibiology.org)
  • With a speed-quality ratio optimized for OCTA, 125 kHz helps you visualize blood flow in fine capillaries while avoiding artefacts due to natural eye motion. (heidelbergengineering.com)
  • However, the flow of electricity, data, signal, and the information is hard to visualize and need specialized skills to implement algorithms related to them. (jips-k.org)
  • To visualize a flow network mathematically, we represent a sample flow network as G(V,E), which represent a directed graph. (jips-k.org)
  • Recent literature on multiple sclerosis (MS) demonstrates the growing implementation of optical coherence tomography-angiography (OCT-A) to discover potential qualitative and quantitative changes in the retina and optic nerve. (biomedcentral.com)
  • Motion estimation and video compression have developed as a major aspect of optical flow research. (wikipedia.org)
  • Flow can be viewed as a concept, where the material, fluid, people, air, and electricity are moving from one node to another over a transportation network, water network, or through electricity distribution systems. (jips-k.org)
  • Generally, in a flow network, every node in the network participates and contributes to the efficiency of the network. (jips-k.org)
  • As flow is a dynamic mechanism, where some physical entities or electricity move from one node to another, two special vertices are identified. (jips-k.org)
  • Considering a single node in a flow network other than the source node, the net flow is equal to zero. (jips-k.org)
  • In this survey paper, we would like to evaluate and analyze the depth and application of the acyclic nature of unidirectional flow in several domains such as industry, biology, medicine, and electricity. (jips-k.org)
  • Three different computer vision techniques were applied to these video datasets-frame differencing, optical flow, and kernelized correlation filters (KCF)-with the aim of quantifying and tracking movements of the individual performers. (frontiersin.org)
  • Optical flow or optic flow is the pattern of apparent motion of objects, surfaces, and edges in a visual scene caused by the relative motion between an observer and a scene. (wikipedia.org)
  • Optical flow can also be defined as the distribution of apparent velocities of movement of brightness pattern in an image. (wikipedia.org)
  • The concept of optical flow was introduced by the American psychologist James J. Gibson in the 1940s to describe the visual stimulus provided to animals moving through the world. (wikipedia.org)
  • The term optical flow is also used by roboticists, encompassing related techniques from image processing and control of navigation including motion detection, object segmentation, time-to-contact information, focus of expansion calculations, luminance, motion compensated encoding, and stereo disparity measurement. (wikipedia.org)
  • Fleet and Weiss provide a tutorial introduction to gradient based optical flow. (wikipedia.org)
  • John L. Barron, David J. Fleet, and Steven Beauchemin provide a performance analysis of a number of optical flow techniques. (wikipedia.org)
  • This is known as the aperture problem of the optical flow algorithms. (wikipedia.org)
  • Optical flow was used by robotics researchers in many areas such as: object detection and tracking, image dominant plane extraction, movement detection, robot navigation and visual odometry. (wikipedia.org)
  • Optical flow information has been recognized as being useful for controlling micro air vehicles. (wikipedia.org)
  • The application of optical flow includes the problem of inferring not only the motion of the observer and objects in the scene, but also the structure of objects and the environment. (wikipedia.org)
  • The examination of blood flow by SLDF is based on the optical Doppler effect. (nih.gov)
  • The techniques that track movement in two dimensions (optical flow and KCF) provided more accurate measures of movement than a technique that provides a single estimate of overall movement change by frame for each performer (frame differencing). (frontiersin.org)
  • 7 , 8 Optical coherence tomography angiography (OCTA) provides a direct, noninvasive visualization and quantification of the retinal microvasculature and blood flow. (arvojournals.org)
  • His main publication, entitled Handbuch der Physiologischen Optik (Handbook of Physiological Optics) , provided empirical theories on spatial vision, color vision, and motion perception, and became the fundamental reference work in this field during the second half of the nineteenth century. (newworldencyclopedia.org)
  • In December 2020, ZEISS, a Germany-based firm operating in the fields of optics and optoelectronics, acquired a majority stake in the imaging business of Arivis AG for an undisclosed amount. (thebusinessresearchcompany.com)
  • A comprehensive collection of Heidelberg Engineering product pictures, logos, and diagnostic images. (heidelbergengineering.com)
  • Unlike other networks such as computer networks, most of the flow networks are visible and have strong material existence and are responsible for the flow of materials with definite shape and volume. (jips-k.org)
  • After graduating, Kirchhoff worked in Berlin and Breslau before moving to the University of Heidelberg in the mid-1850s, where he met Robert Bunsen and began a very fruitful collaboration. (spectroscopyonline.com)
  • These cephalad fluid shifts may cause increased hydrostatic pressure in the brain (intracranial pressure) [2] and orbit (optic nerve sheath). (aao.org)
  • LASEROPTIK manufactures high LIDT laser optics and coatingsfrom VUV to IR. (world-of-photonics.com)
  • According to Christopher Mody, Heidelberg Engineering Clinical Programme Manager, "The 3rd Annual Heidelberg Academy Masterclass, demonstrated our high levels of educational support and partnership with the profession, further uniting the medical retinal fraternity. (visionplusmag.com)
  • Studies and applications related to unidirectional flow are gaining attention from researchers across disciplines in the recent years. (jips-k.org)
  • the wavelength of the laser source is 670 mm, with a power of 100 microW (Heidelberg Engineering, HRF). (nih.gov)
  • 20] W. Liu, K. Sun and C. Zhu, A fast image encryption algorithm based on chaotic map, Optics Lasers Engin. (ac.ir)
  • The main factors that induce RGC apoptosis are the deprivation of neurotrophic factors, the toxic effects of excitatory amino acids, and the toxic effects of NO. The current clinically available treatment strategies are only aimed at lowering IOP, usually through eye drops or surgery, and not directly at the degeneration of the retina and optic nerve. (medicilon.com)
  • In this scenario, the term flow network is widely used in applications involving both physical as well as non-physical entities with limitation on flow capacity. (jips-k.org)
  • A flow in a network G is represented as a function: f: V × V → R. There are three criteria to recognize a network as flow network. (jips-k.org)
  • In network these times in the free always free or needed from flows in the telegraph of the former. (kobeltonline.de)