1. Articles in category: Patents

    1-24 of 2686 1 2 3 4 ... 110 111 112 »
    1. Phase-sensitive optical coherence tomography to measure optical aberrations in anterior segment

      Phase-sensitive optical coherence tomography to measure optical aberrations in anterior segment

      Techniques for measuring optical aberrations of the eye are disclosed. An example method comprises positioning the eye in a measurement location adjacent to a measurement arm of an optical coherence tomography (OCT) interferometer apparatus, so that source light from the measurement arm passes into the anterior segment of the eye and detecting an interference pattern, the interference pattern resulting from a combination of light reflected from the eye and light reflected from a reference arm of the OCT interferometer apparatus. Based on the interference pattern, an optical delay between a reference surface in the anterior segment of the eye and ...

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      Mentions: Alcon
    2. Few-mode fiber endoscope

      Few-mode fiber endoscope

      Disclosed herein are configurations for few-mode fiber optical endoscope systems employing distal optics and few-mode, double-clad or other optical fiber wherein the systems directing an optical beam to a sample via the optical fiber; collecting light backscattered from the sample; direct the backscattered light to a detector via the optical fiber; and detect the backscattered light; wherein the directed optical beam is single mode and the collected light is one or more higher order modes.

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    3. Scan pattern and signal processing for optical coherence tomography

      Scan pattern and signal processing for optical coherence tomography

      An OCT system for measuring a retina as part of an eye health monitoring and diagnosis system. The OCT system includes an OCT interferometer, where the interferometer comprises a light source or measurement beam and a scanner for moving the beam on the retina of a patient's eye, and a processor configured to execute instructions to cause the scanner to move the measurement beam on the retina in a scan pattern. The scan pattern is a continuous pattern that includes a plurality of lobes. The measurement beam may be caused to move on the retina by the motion of ...

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    4. Drift corrected eye tracking

      Drift corrected eye tracking

      A system tracks eye position using a first Optical Coherence Tomography (OCT) eye tracking unit to determine a first position of an eye of a user. The OCT eye tracking unit projects low coherence interference light onto a portion of the user's eye, and uses captured light reflected from the illuminated portion of the user's eye to generate a dataset describing the portion of the user's eye. The first position of the user's eye is determined based upon the generated dataset and a previously generated dataset. In order to minimize error and reduce the effects of ...

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    5. Systems and methods for improved anterior segment OCT imaging

      Systems and methods for improved anterior segment OCT imaging

      Various methods and systems for improved anterior segment optical coherence tomography (OCT) imaging are described. One example method includes collecting a set of OCT data of the cornea of the eye; segmenting the set of OCT data to identify one or more corneal layers; fitting a two-dimensional model of corneal surfaces to the one or more corneal layers; determining motion-correction parameters by minimizing error between the one or more corneal layers and the two-dimensional model of the corneal surfaces; and creating a motion-corrected corneal image dataset from the set of OCT data using the motion-correction parameters. The motion-corrected corneal image ...

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    6. Occlusion-crossing devices

      Occlusion-crossing devices

      A catheter device for crossing occlusions includes an elongate catheter shaft, a rotatable tip configured to rotate relative to the elongate catheter shaft, a drive shaft, and an OCT imaging sensor. The rotatable tip includes a housing coupled with the elongate catheter shaft and cutting wedges extendable from the housing. The drive shaft has a central lumen extending therethrough and extends within the elongate catheter shaft. The drive shaft is coupled with the wedges and is configured to rotate the rotatable tip. The OCT sensor includes an optical fiber coupled with the rotatable tip and configured to rotate therewith. The ...

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      Mentions: Avinger
    7. Spectroscope, optical inspection device and OCT device

      Spectroscope, optical inspection device and OCT device

      This invention is to provide a spectroscope that can improve resolution and reduce loss of light intensity and/or distortion of a wave front while enabling detection of the optical spectrum for each of a plurality of polarization components in incident light. The spectroscope is a spectroscope that comprises a first diffraction grating 51 to which at least a transmitted light or a reflected light from an object to be measured enters, which diffracts a first polarization component of the incident light and which transmits a second polarization component that is different from the first polarization component of the incident ...

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    8. Optically pumped tunable VCSEL employing geometric isolation

      Optically pumped tunable VCSEL employing geometric isolation

      An optically pumped tunable VCSEL swept source module has a VCSEL and a pump, which produces light to pump the VSCEL, wherein the pump is geometrically isolated from the VCSEL. In different embodiments, the pump is geometrically isolated by defocusing light from the pump in front of the VCSEL, behind the VCSEL, and/or by coupling the light from the pump at an angle with respect to the VCSEL. In the last case, angle is usually less than 88 degrees. There are further strategies for attacking pump noise problems. Pump feedback can be reduced through (1) Faraday isolation and (2 ...

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    9. Tunable VCSEL polarization control through dissimilar die bonding

      Tunable VCSEL polarization control through dissimilar die bonding

      A design and method for introducing asymmetric crystal strain to control polarization in a tunable VCSEL, either optically or electrically pumped. The invention is especially relevant to wafer- or die-bonded tunable VCSELs. Then, mechanical stress is applied to the half VCSEL device by asymmetric arrangement of metal bond pads.

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    10. Microscope

      Microscope

      A microscope, comprising an observation beam path that renders an eye to be examined observable, a wavefront measuring device for measuring the refraction of the eye to be examined, an OCT device comprising an OCT illumination beam path, by means of which OCT illumination radiation can be focused as an OCT spot into the eye to be examined, and a control unit that is supplied with at least one measurement value of the wave front measuring device, is provided, wherein the control unit sets the beam diameter and/or the beam shape of the OCT spot on the basis of ...

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    11. Spatially offset optical coherence tomography

      Spatially offset optical coherence tomography

      An optical coherence tomography system for imaging a sample is configured so as to illuminate a region of interest of the sample with incident light from an optical source. The optical coherence tomography system is further configured so as to interfere, on an optical detector, reference light from the optical source with offset returning light emerging from the sample along an offset collection path which is spatially offset from the region of interest of the sample, thereby creating interference on the optical detector.

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    12. OCT image processing

      OCT image processing

      An apparatus for rendering optical coherence tomography, OCT, retinal image data, acquired by an OCT scanner scanning a retina of an eye over a range of scan locations, wherein each scan location is associated with a respective coordinate in a first coordinate system, and each pixel of the rendered OCT retinal image data is associated with a respective coordinate in a second coordinate system different from the first coordinate system. The apparatus comprises a communication module arranged to receive the OCT retinal image data, and a coordinate-determining module arranged to determine values of coordinates in the second coordinate system of ...

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      Mentions: Optos
    13. Optical coherence tomographic device

      Optical coherence tomographic device

      An optical coherence tomographic device configured to acquire a tomographic image of a subject by using an optical interferometry is provided. The optical coherence tomographic device include: a detector configured to detect interference light acquired by the optical interferometry, and to output an interference signal of the interference light; and a processor configured to calculate von Neumann entropy of noise components by using the noise components and signal intensities of the interference signals corresponding to at least one interference light detected by the detector.

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    14. Apparatus, devices and methods for in vivo imaging and diagnosis

      Apparatus, devices and methods for in vivo imaging and diagnosis

      Exemplary method and apparatus for diagnosing or characterizing an inflammation within an anatomical structure can be provided. For example, using at least one source arrangement, it is possible to provide at least one first electro-magnetic radiation to the anatomical structure at least one first wavelength in vivo. With at least one detector arrangement, it is possible to detect at least one second electro-magnetic radiation at least one second wavelength provided from the anatomical structure. The second radiation can be associated with the first radiation, and the first wavelength can be shorter than the second wavelength. The second radiation can be ...

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    15. High-resolution integrated-optics-based spectrometer

      High-resolution integrated-optics-based spectrometer

      A high-resolution single-chip spectrometer is disclosed. Embodiments of the present invention are analogous to Fourier-transform spectrometers; however, embodiments of the present invention have no moving parts. An illustrative embodiment is a spectrometer having a nested plurality of Mach-Zehnder interferometers (MZIs), where all MZIs share at least one surface-waveguide section in each of its sample and reference arms. The light signals in the sample and reference arms are tapped at a series of discrete locations along their length via electro-optically-controlled directional couplers, which are separated by uniform-length waveguide portions in each arm, but where the uniform lengths are different in the ...

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    16. Segmentation in optical coherence tomography imaging

      Segmentation in optical coherence tomography imaging

      A method for improving segmentation in optical coherence tomography imaging. The method comprises obtaining an OCT image of imaged tissue, generating a first feature image for at least a portion of the OCT image, and generating a second feature image for at least the portion of the OCT image, based on either the OCT image or the first feature image, by integrating image data in a first direction across the OCT image or first feature image. A third feature image is generated as a mathematical function of the first and second feature images, and layer segmentation for the OCT image ...

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      Mentions: Alcon
    17. Single-chip optical coherence tomography device

      Single-chip optical coherence tomography device

      A high-performance single-chip, integrated-optics-based OCT system is disclosed, where the length of the reference arm is digitally variable. The reference arm includes a plurality of switch stages comprising a 2.times.2 tunable wavelength-independent waveguide switch that can direct an input light signal onto either of two different-length output waveguides. In some embodiments, the directional couplers are thermo-optic based. Some embodiments include a solid-state scanning system for scanning a sample signal along a line of object points on the sample under test.

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    18. Method for preserving the synchronism of a Fourier Domain Mode Locked (FDML) laser

      Method for preserving the synchronism of a Fourier Domain Mode Locked (FDML) laser

      The invention relates to a method for maintaining the synchronism of a Fourier Domain Mode Locked (FDML) laser, the FDML laser comprising at least one dispersion-compensated resonator with at least one variably wavelength-selective optical filter, the laser light circulating in the resonator at a circulation frequency, and the wavelength selectivity of the filter being repeatedly modified at a syntonising rate, the FDML laser being synchronous when the syntonising rate is an integral multiple of the circulation frequency. Said method is characterised by the following steps: a) at least a portion of the laser light is coupled out of the resonator ...

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      Mentions: Optores
    19. Intravascular plaque detection in OCT images

      Intravascular plaque detection in OCT images

      Detection of intravascular plaque in OCT images is carried out by obtaining images of vascular tissue from a vascular component by OCT either in a static mode of a single image or in a dynamic mode where the images are obtained by scanning. The method acts by dividing the OCT image into different regular regions, calculating different texture features for each of the above regions with a reduced set of less than a full set of the 26 Haralick textural features, using a clustering algorithm to segment the image defined by its texture features calculated above into different regions and ...

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    20. Stent detection methods and imaging system interfaces

      Stent detection methods and imaging system interfaces

      The disclosure relates, in part, to computer-based visualization of stent position within a blood vessel. A stent can be visualized using intravascular data and subsequently displayed as stent struts or portions of a stent as a part of a one or more graphic user interface(s) (GUI). In one embodiment, the method includes steps to distinguish stented region(s) from background noise using an amalgamation of angular stent strut information for a given neighborhood of frames. The GUI can include views of a blood vessel generated using distance measurements and demarcating the actual stented region(s), which provides visualization of ...

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      Mentions: Abbot
    21. Systems and methods for reflectance-based projection-resolved optical coherence tomography angiography

      Systems and methods for reflectance-based projection-resolved optical coherence tomography angiography

      Embodiments provide systems and methods associated with a reflectance-based projection-resolved (rbPR) optical coherence tomography angiography (OCTA) algorithm which uses optical coherence tomography (OCT) reflectance to enhance the flow signal and suppress the projection artifacts in 3-dimensional OCTA. rbPR improves the vascular connectivity and improved the discrimination of the deeper plexus angiograms in healthy eyes, compared to prior PR-OCTA method. Additionally, rbPR removes flow projection artifacts more completely from the outer retinal slab in the eyes with age-related macular degeneration, and preserves vascular integrity of the intermediate and deep capillary plexuses in the eyes with diabetic retinopathy. Additionally, the rbPR method ...

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    22. Method for determining the topography of the cornea of an eye

      Method for determining the topography of the cornea of an eye

      A method for determining the topography of the cornea of an eye on the basis of an optical, contactless data capture. In the method for determining the topography of the cornea of an eye, which is based on a deflectometric method, the deflectometric measurements are carried out with the aid of a keratometric method by virtue of additional OCT-based scans being made at the keratometric measurement points, wherein the two measurement systems are registered to one another and both the keratometric and the OCT-based measurement values are recorded and used for mutual calibration to determine and output the topographic data ...

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    1-24 of 2686 1 2 3 4 ... 110 111 112 »
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