1. Articles from uspto.gov

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    1. Generation of dewarped OCT B-scan images

      Generation of dewarped OCT B-scan images

      A method of generating a look-up table, LUT, for constructing a dewarped B-scan image from A-scans of a cropped part of a sequence of acquired OCT A-scans, the LUT associating each of a plurality of pixel arrays that are to form the dewarped B-scan image with a respective A-scan in the cropped part. The method comprises: using an indication of a spatial distribution of scan locations of A-scans to determine a dewarp function for selecting, from among acquired A-scans, A-scans having uniformly spaced scan locations; using the function and cropping information, in accordance with which the cropped part is cropped ...

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      Mentions: Optos
    2. Systems and methods for generating and displaying OCT angiography data using variable interscan time analysis

      Systems and methods for generating and displaying OCT angiography data using variable interscan time analysis

      An imaging (e.g., with an optical coherence tomography system) method that includes 1) acquiring repeated B-scans in a manner consistent with forming images, 2) processing the acquired images according to a variable interscan time analysis (VISTA) method, and 3) generating and displaying a color-mapped image pixel color of the color-mapped image fluid flow speed, or a related quantity.

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    3. Polarization sensitive optical coherence tomography apparatus and control method therefor

      Polarization sensitive optical coherence tomography apparatus and control method therefor

      Disclosed is a polarization sensitive optical coherence tomography apparatus and control method thereof. According to the polarization sensitive optical coherence tomography apparatus and control method thereof of the present invention, the local phase delay value of each layer of a multiple of layers using Jones matrix for a birefringent material having the multiple of layers where each layers optical axis is random based on a polarized signal detected in an optical detector may be calculated. According to the present invention, a skin aging level can be accurately examined by obtaining an accurate accumulated phase delay value for a multiple of ...

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    4. Eye tracking using optical coherence methods

      Eye tracking using optical coherence methods

      A system tracks eye movement using optical coherence in a head mounted display. The system includes an illumination source configured to project low coherence interference light onto a portion of a user's eye. The system includes a scanning system to select an axial position within the illuminated portion of the user's eye. The system includes a detector configured to collect light reflected from the illuminated portion of the user's eye at the selected axial position, and the reflected light includes measurement data characterizing the illuminated portion of the user's eye. The system includes a controller configured ...

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    5. Iris edge detection in Optical Coherence Tomography

      Iris edge detection in Optical Coherence Tomography

      A-lines are obtained from an OCT scan of the eye, some of which pass through the iris and the lens and some of which pass through the lens but not the iris. An interface is detected from the A-lines; at least some of this interface is assumed to correspond to either the anterior or posterior of the iris. For each A-line, a first metric is derived from pixels near the detected first interface, such that the first metric reflects an OCT signal intensity associated with the interface, and a second metric is derived from pixels further from the interface, such ...

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    6. Reconfigurable optical coherence tomography (OCT) system

      Reconfigurable optical coherence tomography (OCT) system

      An optical coherence tomography (OCT) apparatus includes an optical source module comprising two or more selectable optical sources or an optical source configured to selectively operate in two or more source operating modes, or a combination of both, and further comprises an OCT engine coupled to the optical source module, the OCT engine comprising an OCT interferometer. The OCT apparatus still further includes a mode-switching optics module coupled to the OCT engine and comprising one or more swappable, selectable, or adjustable optical components, such that the mode-switching optics module is configured to selectively provide two or more optical configurations for ...

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      Mentions: Alcon
    7. Optical coherence tomography (OCT) imaging surgical target tissue by nonlinear scanning of an eye

      Optical coherence tomography (OCT) imaging surgical target tissue by nonlinear scanning of an eye

      Systems and techniques for laser surgery are described. Scan data may be created by determining a coordinate of the object at a set of points along an arc by the imaging system, wherein the coordinate of the object is a Z coordinate of an object layer. An object shape parameter and position parameter may be determined based on the scan data by a system control module by extracting an amplitude and a phase of the scan data determining a center of the object layer based on the extracted amplitude and phase.

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      Mentions: Alcon
    8. Optical coherence tomography for identity verification

      Optical coherence tomography for identity verification

      A system and method for using optical coherence tomography for identity authentication. Embodiments include fingerprint validation, iris scan validation and facial scan validation. A preferred embodiment uses an optical coherence tomography system in conjunction with at least one additional two or three dimensional imaging of fingerprint, iris or facial biological indicators. Various embodiments provide additional combinations of two and three dimensional identification features so as to increase likelihood of accurate authentication of a subject under test.

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    9. Multiple optical fusion-image based method and apparatus for diagnosing brain tumor in real-time

      Multiple optical fusion-image based method and apparatus for diagnosing brain tumor in real-time

      A method and an apparatus for diagnosing a brain tumor in real-time are disclosed. A method for detecting a brain tumor in real-time can comprise the steps of: generating, by a probe, a plurality of input signals and transferring the same to a target detection region which is estimated to be the location of a brain tumor; receiving, by the probe, a plurality of reflection signals on the basis of a plurality of input signals; and detecting, by the probe, a plurality of the received reflection signals, wherein a plurality of the input signals comprise a terahertz signal, an optical ...

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    10. Scan error correction in low coherence scanning interferometry

      Scan error correction in low coherence scanning interferometry

      In general, in one aspect, the invention features apparatus that includes a broadband scanning interferometry system including interferometer optics for combining test light from a test object with reference light from a reference object to form an interference pattern on a detector, wherein the test and reference light are derived from a common light source. The interferometry system further includes a scanning stage configured to scan an optical path difference (OPD) between the test and reference light from the common source to the detector and a detector system including the detector for recording the interference pattern for each of a ...

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      Mentions: Zygo
    11. Devices and arrangements for performing coherence range imaging using a common path interferometer

      Devices and arrangements for performing coherence range imaging using a common path interferometer

      Devices, arrangements and apparatus adapted to propagate at least one electro-magnetic radiation are provided. In particular, a probe housing, a sample arm section and a reference arm section can be included. For example, the sample arm section can be at least partially situated within the probe housing, and configured to propagate a first portion of the electro-magnetic radiation that is intended to be forwarded to a sample. The reference arm section can be at least partially situated within the probe housing, and configured to propagate a second portion of the electro-magnetic radiation that is intended to be forwarded to a ...

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    12. Optical probe

      Optical probe

      An optical probe includes an optical source that generates an optical beam that propagates from a proximal end to a distal end of an optical fiber that imparts a transformation of a spatial profile of the optical beam. An optical control device imparts a compensating spatial profile on the optical beam that at least partially compensates for the transformation of the spatial profile of the optical beam imparted by the optical fiber in response to a control signal from a signal processor. A distal optical source generates a calibration light that propagates through the one or more optical waveguides from ...

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      Mentions: Eric A. Swanson
    13. Optical interference tomographic image generating apparatus and method for using same

      Optical interference tomographic image generating apparatus and method for using same

      Provided are an optical interference tomographic image generating apparatus and a method for using the same, whereby an image can be acquired in which the effect of unnecessary matter near a sample is reduced. An optical interference tomographic image generating apparatus is provided with an OCT control device for performing image processing for vertically inverting an image generated from a detection signal in the case of a setting whereby a reference mirror is disposed so that the optical path length of a reference optical path matches the optical path length of a sample optical path having as a reference position ...

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    14. Methods and apparatus for phase stabilized swept-source optical coherence tomography (SS-OCT) including rescaling and dynamic range enhancement

      Methods and apparatus for phase stabilized swept-source optical coherence tomography (SS-OCT) including rescaling and dynamic range enhancement

      An optical coherence tomography (OCT) system electrically mixes a signature signal with an OCT signal (e.g., an interferogram) output by a photodetector of the OCT system. The signature signal may be a signal output by a photodetector that detects an optical signal from a fiber Bragg grating. The signature signal may then be time delayed before combination with the OCT signal. A series of interferograms are then aligned according to the signature signal. A rescaling signal may be similarly electrically mixed with the signature and OCT signals.

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    15. Frequency-domain optical interferometry imaging apparatus and method for astigmatistic bi-focal illumination imaging of an eye

      Frequency-domain optical interferometry imaging apparatus and method for astigmatistic bi-focal illumination imaging of an eye

      Embodiments of the present invention provide a method and apparatus for frequency-domain optical interferometry imaging. Embodiments of the invention include an apparatus comprising a line-shaping optical element for directing optical radiation into a line illumination, an imaging optical element for receiving optical radiation comprising radiation reflected from a target sample and a reference point associated with the target sample, and a detection unit for measuring common path interferences between a plurality of reflections from the target sample and the reference point. Embodiments of the invention include a method comprising directing radiation into a line illumination, directing the line illumination towards ...

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    16. Optical delay line for coherence imaging

      Optical delay line for coherence imaging

      An optical coherence tomography (OCT) system comprises an interferometer configured to generate interference light based on interference between a reference beam and a sample beam with which a sample has been irradiated. A detector operates to detect intensities of the interference light and/or one or more interference patterns; a processor is configured measure a signal falloff of the intensity of the interference light and/or the one or more interference patterns; and an optical delay line configured to adjust an optical path difference according to the signal falloff so as not substantially introduce artifacts to an image of the ...

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    17. Non-invasive blood sugar measurement method and device using optical reflectometry

      Non-invasive blood sugar measurement method and device using optical reflectometry

      A non-invasive blood sugar measurement device using optical reflectometry is provided. According to an embodiment of the present invention, provided are a specific configuration and method, the configuration comprising: a light generation means for generating light to be emitted at the skin to be measured when OTDR and OFDR are used; an optical measurement means for measuring the intensity of light; an optical system for emitting the generated light at the skin to be measured and transmitting reflected light to the optical measurement means; an analysis means for analyzing collected reflected light on the basis of a change in the ...

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    18. Dual-edge sampling with k-clock to avoid aliasing in optical coherence tomography

      Dual-edge sampling with k-clock to avoid aliasing in optical coherence tomography

      Techniques and apparatus for producing sampled Optical Coherence Tomography (OCT) interference signals without aliasing, based on a swept-source OCT interference signal. An example apparatus comprises a k-clock circuit configured to selectively output a k-clock signal at any of a plurality of k-clock frequencies ranging from a minimum k-clock frequency to a maximum k-clock frequency, and an anti-aliasing filter configured to filter a swept-source OCT interference signal, to produce a filtered OCT interference signal, where the anti-aliasing filter has a cut-off frequency greater than one-half the minimum k-clock frequency but less than the minimum k-clock frequency. The apparatus further comprises an ...

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    19. Fast parallel optical coherence tomographic image generating apparatus and method

      Fast parallel optical coherence tomographic image generating apparatus and method

      Provided is a fast parallel optical coherence tomographic image generating method including dispersing light into N spectral regions .DELTA..lamda..sub.1 through .DELTA..lamda..sub.N sequentially from a low frequency wavelength to a high frequency wavelength, the light being emitted from a broadband light source of a fast parallel optical coherence tomographic image generating apparatus, N being an integer greater than or equal to 2, splitting the light emitted from the broadband light source to be incident on a sample and a reference mirror, partitioning the sample into N image regions P.sub.1 through P.sub.N ...

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    20. Ophthalmological imaging device

      Ophthalmological imaging device

      An ophthalmological imaging device comprising an objective lens, an interference optical system, an image forming unit, an optical member, and an analyzer. The interference optical system divides light from a light source into measurement light and reference light, causes the measurement light to become incident on a subject's eye via the objective lens, and detects interference light between the reference light and return light of the measurement light that has exited from the subject's eye and passed through the objective lens. The image forming unit forms an image of the subject's eye based on a detection result ...

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    21. Apparatus and method for processing the signal in master slave interferometry and apparatus and method for master slave optical coherence tomography with any number of sampled depths

      Apparatus and method for processing the signal in master slave interferometry and apparatus and method for master slave optical coherence tomography with any number of sampled depths

      The present invention related to an apparatus and method for master slave interferometry, referred to as Complex Master Slave (CMS). The method and apparatus can be used to provide complex-valued measurements of a signal reflected from an axial position inside an object or of signals reflected from points at several axial positions inside an object.

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    22. Image processing apparatus, image processing method, computer-readable storage medium, and system using optical coherence tomography

      Provided is an image processing apparatus including: a data acquiring unit configured to acquire a plurality of pieces of tomographic data, which are obtained by performing optical coherence tomographic imaging of an object to be inspected through use of measuring light a plurality of times; a noise acquiring unit configured to acquire a noise characteristic of the tomographic data; a coefficient determining unit configured to determine a weighting coefficient corresponding to each pixel position in a tomographic image generated from the tomographic data based on the plurality of pieces of tomographic data and the noise characteristic; a changing unit configured ...

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    23. Common-path integrated low coherence interferometry system and method therefor

      Common-path integrated low coherence interferometry system and method therefor

      A low coherence interferometry imaging system comprising a common-path interferometer that is at least partially integrated as part of a planar lightwave circuit is disclosed. Imaging systems in accordance with the present invention are implemented in integrated optics without the inclusion of highly wavelength-sensitive components. As a result, they exhibit less wavelength dependence than PLC-based interferometers of the prior art. Further, the common-path interferometer arrangement of the present invention avoids polarization and wavelength dispersion effects that plague prior-art PLC-based interferometers. Still further, an integrated common-path interferometer is smaller and less complex than other integrated interferometers, which makes it possible to ...

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    1-24 of 2165 1 2 3 4 ... 89 90 91 »
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