1. Articles in category: Patents

    1-24 of 1916 1 2 3 4 ... 78 79 80 »
    1. Optical Coherence Tomography Glaucoma Detection Based On Retinal Vessel Relief Height

      Optical Coherence Tomography Glaucoma Detection Based On Retinal Vessel Relief Height

      Systems and techniques for detecting glaucoma in a subject based on retinal vessel relief height obtained from optical coherence tomography (OCT) image data are disclosed. In one example approach, a retinal vessel relief height relative to a retinal plane may be calculated from OCT image data and the presence or absence of a glaucoma condition may be determined based on the retinal vessel relief height.

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    2. Optical systems for whole eye imaging and biometry

      Optical systems for whole eye imaging and biometry

      Scanning optical beam imaging systems for imaging extended structures of an eye and providing biometry of an eye are provided. The systems include a focal system for shifting the focus of the scanning system from the front to the back of the eye. The systems provide for converging rays that can scan through the pupil of the eye, enabling scanning of the anterior and posterior segments of the eye using a common objective and a fixed working distance.

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    3. Superluminescent diode and optical coherence tomography apparatus including the superluminescent diode

      Superluminescent diode and optical coherence tomography apparatus including the superluminescent diode

      A superluminescent diode which amplifies light through stimulated amplification and outputs emitted beams from one of edges at two ends includes a cladding layer of a first conductivity type formed on a semiconductor substrate, an active layer formed on the cladding layer of the first conductivity type, a cladding layer of a second conductivity type formed on the active layer, and a multilayer film formed at the other edge opposite to the one edge that emits the beams, reflectance of which has wavelength dependence, and a spectral shape of the emitted beams output from the one edge is controllable by ...

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    4. System and method for generating and utilizing a valid sweep vector to obviate spurious data and increase sweep rate in an akinetic path-based swept laser

      System and method for generating and utilizing a valid sweep vector to obviate spurious data and increase sweep rate in an akinetic path-based swept laser

      A system and method for triggering data acquisition in a semiconductor laser system including outputting electromagnetic energy from the semiconductor laser over a range of wavelengths according to a signaling path. The signaling path includes a plurality of discrete data inputs to the semiconductor laser for outputting electromagnetic energy over a range of wavelengths and the signaling path includes one or more perturbances in transitioning from one wavelength to another wavelength along the signaling path. A series of triggering signals are generated for input to a measurement system by the semiconductor laser. The electromagnetic energy output from the semiconductor laser ...

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    5. First Annual OCT Angiography Summit Signals a New Era in Imaging Technology

      First Annual OCT Angiography Summit Signals a New Era in Imaging Technology

      OCT Angiography: The Next Game Changer in OCT Scientists, clinicians and engineers from throughout the world gathered in Portland, Oregon, USA for the first annual OCT Angiography Summit meeting. Participants spent the day sharing their knowledge and discussing applications of a breakthrough imaging technology that may someday transform the way we diagnose and care for patients with the most common causes of blindness, namely macular degeneration, glaucoma and diabetes. Currently, these innovations are being applied in ophthalmology and are proving to be a superior alternative to dye-based methods for visualizing and measuring blood flow in the back of the eye ...

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    6. Optical tomographic imaging apparatus and imaging method therefor to acquire images indicating polarization information

      Optical tomographic imaging apparatus and imaging method therefor to acquire images indicating polarization information

      An imaging apparatus adjusts the polarization directions of irradiation beams (to a diffraction grating) corresponding to first and second beams respectively which have different polarization directions (for example, by adjusting a relative angle formed between light-emitting ends of respective polarization maintaining fibers) so that the spectral characteristics of the irradiation beams at the diffraction grating coincide with each other. Then, the imaging apparatus acquires a tomographic image indicating polarization information for a object based on beams (that come from the diffraction grating for splitting and diffracting a beam from the adjustment unit) corresponding to the first and second beams respectively ...

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    7. Motion-compensated optical coherence tomography system

      Motion-compensated optical coherence tomography system

      A motion-compensated optical coherence tomography system includes an optical coherence tomography sensor that includes a common-path optical fiber having an end for emitting light, reflecting reference light and receiving returned light for detection; a motion-compensation system attached to the common-path optical fiber and operable to move at least a portion of the optical fiber so as to compensate for motion between the end of the common-path optical fiber and an object being imaged; and a feedback control system configured to communicate with the optical coherence tomography sensor and the motion-compensation system. The feedback control system is configured to receive information ...

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    8. Optical coherence tomographic detection of organisms

      Optical coherence tomographic detection of organisms

      A method is disclosed of detecting the presence of an organism in a medium. In some embodiments, the method includes: obtaining a series of optical coherence tomography measurements of a region of the medium; processing the series of optical coherence tomography measurements to determine information indicative of translational and rotational motion of an object in the region of the medium; identifying the object as organism based on the information indicative of translational and rotational motion of the object; and outputting information indication of the presence of the organism.

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    9. Multiple reference OCT system

      Multiple reference OCT system

      The invention provides for generating a set of signature signals that correspond to a range of depths within a target. These signature signals can include multiple individual reference signals and be can modified to compensate for specific characteristics of the target. In the preferred embodiment the members of the set of signature signals are correlated with data sets by phase rotating individual reference signals to determine maximum and minimum correlation and thereby enabling determination of the scattering characteristic of the target at each depth. Also a pilot signal is monitored to dynamically determine the phase relationship between individual reference signals ...

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    10. Optic neuropathy detection with three-dimensional optical coherence tomography

      Optic neuropathy detection with three-dimensional optical coherence tomography

      Based on optical coherence tomography (OCT) imaging of a portion of an eye, a mask of an anatomical feature is derived. Using the mask as a reference, a scan path is determined that is at least partially fitted to and/or partially enclosing the mask. OCT scan data corresponding to the scan path is acquired and analyzed to detect optic neuropathies.

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    11. Imaging accessory frame for integration with an operating microscope

      Imaging accessory frame for integration with an operating microscope

      Some embodiments of the present inventive concept provide an accessory frame including an optical coherence tomography (OCT) imaging head. The accessory frame includes a mounting plate including a microscope field lens attachment port and a microscope field plate anchor pin. The mounting plate is configured to receive an intermediate field lens in the microscope field lens attachment port such that the accessory frame shares the mounting plate in common with an intermediate field lens.

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    12. Optical coherence tomography device capable of controlling measuring position

      Optical coherence tomography device capable of controlling measuring position

      Method of determining a property of a sample from a correlogram obtainable by scanning of a surface of the sample through a focal plane of an objective using broad-band interferometry is provided. The correlogram may be displaying interference radiation intensity as a function of the scanning distance from the surface. The correlogram may be correlated with a secondary correlogram to obtain a cross correlogram or with the same correlogram to obtain an autocorrelogram. A property of the sample may be determined from the auto or cross correlogram.

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    13. Optical-image pickup apparatus and method for controlling the same

      Optical-image pickup apparatus and method for controlling the same

      An optical coherence tomography device (OCT) is capable of controlling a distance between an eye to be examined (object) and the OCT and accurately center-aligning the eye. A mire ring optical system emits a measuring mire ring light to an object to be examined. A dichroic mirror separates an optical path of illumination light reflected from the object from the optical path of the signal light originating from the tomographic image formation section and delivers a reflected image to an image formation section and a tomographic image formation section. An objective lens condenses light reflected from the object, and a ...

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    14. Method and apparatus for determining a property of a surface

      Method and apparatus for determining a property of a surface

      Method of determining a property of a sample from a correlogram obtainable by scanning of a surface of the sample through a focal plane of an objective using broad-band interferometry is provided. The correlogram may be displaying interference radiation intensity as a function of the scanning distance from the surface. The correlogram may be correlated with a secondary correlogram to obtain a cross correlogram or with the same correlogram to obtain an autocorrelogram. A property of the sample may be determined from the auto or cross correlogram

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    15. Automated analysis of the optic nerve head: measurements, methods and representations

      Automated analysis of the optic nerve head: measurements, methods and representations

      The present invention relates to structural analysis of the optic nerve head (ONH). In one approach, a 3D volume of intensity data which includes the optic nerve head is acquired using an optical coherence tomography (OCT) system. The vitreoretinal interface (VRI) and the optic disc margin are identified from the 3D data. The minimum area of a surface from the optic disc margin to the VRI is determined. This minimum area can be displayed as an image or in the alternative, a value corresponding to this minimum area can be displayed. The minimum area measurement provides relevant clinical information to ...

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    16. Systems and methods for enhanced accuracy in OCT imaging of the cornea

      Systems and methods for enhanced accuracy in OCT imaging of the cornea

      Systems and methods for enhanced accuracy in optical coherence tomography imaging of the cornea are presented, including approaches for more accurate corneal surface modeling, pachymetry maps, keratometric values, and corneal power. These methods involve new scan patterns, an eye tracking mechanism for transverse motion feedback, and advanced motion correction algorithms. In one embodiment the methods comprise acquiring a first sparse set of data, using that data to create a corneal surface model, and then using the model to register a second set of denser data acquisition. This second set of data is used to create a more accurate, motion-corrected model ...

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    17. Optical tomographic image generation method and optical tomographic image generation apparatus

      Optical tomographic image generation method and optical tomographic image generation apparatus

      Provided is a method for easily improving image quality in an optical tomographic imaging apparatus. An optical tomographic image generation method of generating a tomographic image of an object includes: acquiring a signal; performing Fourier transform; and obtaining the tomographic image. The optical tomographic image generation method further includes one of the steps of combining a plurality of the signals acquired within a predetermined time and combining a plurality of the signals acquired within a predetermined time after performed the Fourier transform thereon

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    18. Measurement Of The Lipid And Aqueous Layers Of A Tear Film

      Measurement Of The Lipid And Aqueous Layers Of A Tear Film

      Systems and methods for determining thickness of lipid and aqueous layers of a tear film in which a spectrum array is generated from optical coherence tomography and input into a statistical estimator, which determines the thickness of the lipid and/or aqueous layers at a nanometer resolution based on the inputted spectrum and other information, such as information about a laser intensity noise, Poisson noise, and dark noise associated with the OCT

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    19. Scanning Laser Ophthalmoscopes

      Scanning Laser Ophthalmoscopes

      A scanning laser ophthalmoscope (SLO) for imaging the retina of an eye comprises a source ( 12 ) of collimated light, a scanning device ( 14, 16, 1328, 1319 ), a scan transfer device ( 20 ) and a detector ( 1310 ). The scan transfer device has a first focus ( 16 ) at which an apparent point source is provided and a second focus ( 24 ) at which an eye ( 524, 1324 ) may be accommodated. The scan transfer device transfers a two-dimensional collimated light scan from the apparent point source into the eye. An optical coherence tomography (OCT) system ( 900 ) is combined with the SLO, the OCT system providing ...

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    20. Segmentation and enhanced visualization techniques for full-range fourier domain optical coherence tomography

      Segmentation and enhanced visualization techniques for full-range fourier domain optical coherence tomography

      Presented here are new processing techniques for optical coherence tomography (OCT) data that allow for improved visualization and use of full-range OCT images. These techniques minimize the central line artifact and the complex conjugate artifact without requiring additional system hardware or significantly increasing post-processing time. The central line artifact is minimized by normalizing each A-scan to account for ripples at the zero-delay position. The complex conjugate artifact is minimized by segmentation of a layer or layers that cross the zero-delay position, and in some embodiments by further segmentation of other surfaces based on the segmentation of the initial layer or ...

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    21. Systems For Optical Imaging Of Biological Tissues

      Systems For Optical Imaging Of Biological Tissues

      A fiber-based polarization sensitive optical coherence tomography (PS-OCT) system uses a new polarization diversity detection (PDD) scheme and requires no active polarization modulating components. Retardation of the sample can be determined from amplitudes of arbitrarily-oriented x- and y-components of the reflected light. A hybrid custom 50/50 coupler with single-mode fiber inputs and polarization maintaining (PM) fiber outputs combines light from sample and reference arms of an interferometer. Another embodiment provides a system adapted to provide co-registered autofluorescence-optical coherence tomography (AF-OCT) imaging. AF excitation light is introduced and collected AF light is extracted at a fiber optic rotary joint (FORJ ...

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    22. Optical Coherence Tomography (OCT) System With Improved Motion Contrast

      Optical Coherence Tomography (OCT) System With Improved Motion Contrast

      This disclosure relates to the field of Optical Coherence Tomography (OCT). This disclosure particularly relates to an OCT system with improved motion contrast. This disclosure particularly relates to motion contrast methods for such OCT systems.

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    23. Optical Coherence Tomography (OCT) System With PHASE-SENSITIVE B-SCAN Registration

      Optical Coherence Tomography (OCT) System With PHASE-SENSITIVE B-SCAN Registration

      This disclosure relates to the field of Optical Coherence Tomography (OCT). This disclosure particularly relates to an OCT system having a configuration that uses a phase sensitive B-scan registration method. In this disclosure, an OCT system may have a configuration that scans a physical object, acquires OCT signals to form B-scans, uses these B-scans to determine an optimal shift in an axial direction by using total phase error between B-scans, and align B-scans, thereby minimizing effects of motion that may occur during scanning of the physical object. La présente invention concerne le domaine de la tomographie par cohérence ...

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    1-24 of 1916 1 2 3 4 ... 78 79 80 »
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