1. Articles from patentscope.wipo.int

  2. 25-48 of 285 « 1 2 3 4 5 ... 10 11 12 »
    1. Extended Duration Optical Coherence Tomography (OCT) System

      Extended Duration Optical Coherence Tomography (OCT) System

      This disclosure relates to the field of Optical Coherence Tomography (OCT). This disclosure particularly relates to methods and systems for providing larger field of view OCT images. This disclosure also particularly relates to methods and systems for OCT angiography. These systems may allow OCT scanning for an extended duration and generation of large field OCT images suitable for the OCT angiography.

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    2. 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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    3. 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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    4. Systems And Methods For Eye Tracking For Motion Corrected Ophthalmic Optical Coherenece Tomography

      Systems And Methods For Eye Tracking For Motion Corrected Ophthalmic Optical Coherenece Tomography

      Systems and methods for eye tracking for motion corrected ophthalmic optical coherence tomography (OCT) are disclosed. According to an aspect, an imaging system includes an eye tracking device configured to determine movement of an eye. The imaging system also includes an OCT apparatus configured to generate OCT images of a retina of the eye. The OCT apparatus includes a scanner operable to be moved for relocating an OCT scan pivot at a pupil plane for image capture and during capture of the OCT images. The imaging system also includes a controller configured to control the scanner to relocate the OCT ...

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    5. Atherectomy Catheters And Occlusion Crossing Devices

      Atherectomy Catheters And Occlusion Crossing Devices

      Atherectomy catheters and methods of using them are described herein. In particular, described herein are optical coherence tomography (OCT) catheters that may include a distal tip that can be deflected away from the long axis of the device at a hinge point that is offset (e.g., located on a side of the elongate body near the distal end of the elongate body) and a rotatable cutter near an imaging assembly that can be driven against the wall with a high mechanical advantage.

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    6. 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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    7. 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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    8. 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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    9. Optical Coherence Tomography System With Multiple Sample Paths

      Optical Coherence Tomography System With Multiple Sample Paths

      Improved optical coherence tomography (OCT) imaging systems are generally described. In an example, an OCT imaging system includes a tunable laser source, an interferometer, a splitter, and a detector. The tunable laser source is configured to provide a wavelength-scanned beam. The interferometer is configured to split the wavelength-scanned beam into a reference beam and an object beam. The splitter is configured to split the object beam into a first path corresponding to an anterior chamber imaging component and a second path corresponding to a retinal imaging component. The detector is configured to detect a signal caused by interference between the ...

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    10. Apparatus And Methods For NON-INVASIVE Assessment Of Transplant Kidney Viability

      Apparatus And Methods For NON-INVASIVE Assessment Of Transplant Kidney Viability

      A kidney viability assessment system (KVAS) is disclosed which provides objective and reliable tests to assess the viability of transplant or donor kidneys in vivo and predict their post-transplant outcomes. KVAS includes an optical device augmented by an intelligent algorithm that can evaluate the viability or quality of the donor kidney in a real-time, non-invasive way. In particular, it includes a handheld optical coherence tomography (OCT) imaging device and at least one processor configured for executing a set of instructions corresponding to an automatic image processing algorithm for quantification of kidney microstructures and functions. Handheld OCT can survey the entire ...

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    11. Geographic Atrophy Identification And Measurement

      Geographic Atrophy Identification And Measurement

      Geographic atrophy of the eye can be detected and measured by imaging the eye at a depth greater than the retinal pigment epithelium (RPE) at a plurality of locations of the eye, for example, using optical coherence tomography (OCT); determining a ratio of the intensities of imaging signals of a retinal layer(s) with respect to the intensity of imaging signals of a sub-RPE layer(s) at each location; determining representative values based at least in part on the determined ratios; generating a map of the representative values; and identifying diseased areas from the map. Contours and binary maps may ...

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    12. Detection Of Missampled Interferograms In Frequency Domain OCT With A K-CLOCK

      Detection Of Missampled Interferograms In Frequency Domain OCT With A K-CLOCK

      Optical coherence tomography light sources can be non-linear and attempts to linearize them can lead to asynchrony between the light source and A-line scans and missampling in the scans causing signal noise. Accordingly, a system and methods are provided herein to detect missampling by obtaining a plurality of interferograms; providing at least two wavenumber reference signals at different wavenumbers, wherein the wavenumber reference signals comprise attenuated or enhanced portions of each of the plurality of interferograms; aligning each of the plurality of interferograms according to one of the at least two wavenumber reference signals; and for each of the plurality ...

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    13. Characterizing Ablation Lesions Using Optical Coherence Tomography (OCT)

      Characterizing Ablation Lesions Using Optical Coherence Tomography (OCT)

      Systems, methods, and other embodiments associated with characterizing Radio Frequency Ablation (RFA) lesions using Optical Coherence Tomography (OCT) are described. One example method includes acquiring an OCT signal from a Region Of Interest (ROI) in an ablated material. The example method may also include determining whether a lesion was formed by the ablation by analyzing optical properties of the ROI as recorded in the OCT signal.

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    14. Methods and apparatus for swept-source optical coherence tomography

      Methods and apparatus for swept-source optical coherence tomography

      A method and apparatus for tunable filter linearization of a Fourier-Domain Mode Locking (FDML) laser for a SS-OCT comprising the steps of: choosing a fundamental frequency that avoids the mechanical resonance frequencies of a tunable filter; summing two or three harmonically related sinusoids of the fundamental frequency; and tuning the amplitudes and phases of the summed sinusoids to compensate for nonuniformities in amplitude and phase responses of the tunable filter.

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    15. Surface Emitting Laser And Optical Coherence Tomography Apparatus Including The Same

      Surface Emitting Laser And Optical Coherence Tomography Apparatus Including The Same

      A surface emitting laser includes a lower reflector, an active layer, a gap portion, and an upper reflector, which are arranged in that order, and a driving unit. The surface emitting laser is capable of varying a wavelength of emitted light by changing a distance between the upper and lower reflectors. The driving unit moves one of the upper and lower reflectors in an optical axis direction of the emitted light. When λ g is a wavelength at which a gain at a time of laser oscillation of the active layer is at a maximum, λ 0 is a center wavelength of ...

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    16. Method And Apparatus For Creating Ocular Surgical And Relaxing Incisions

      Method And Apparatus For Creating Ocular Surgical And Relaxing Incisions

      A scanning system for treating target tissue in a patient's eye includes an ultrafast laser source configured to deliver a laser beam comprising a plurality of laser pulses; an Optical Coherence Tomography (OCT) device configured to generate signals which may be used to create an image of the cornea and limbus of the eye of the patient; a scanner configured to focus and direct the laser beam in a pattern within the cornea or limbus to create incisions therein; and a controller operatively coupled to the laser source and scanner configured to control the scanner to adjust the position ...

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    17. POLARIZATION-SENSITIVE Optical Coherence Tomography System

      POLARIZATION-SENSITIVE Optical Coherence Tomography System

      In a polarization-sensitive optical coherence tomography system, an interferometer includes single mode fibers and a plurality of polarization controllers. At least one of the plurality of polarization controllers is disposed on each of the fibers of the interferometer. The fibers include a fiber for sample light beam, a fiber for reference light beam, and a fiber for detection light beam. An image forming unit determines a pixel value from a data set consists of two orthogonal polarization components simultaneously obtained at substantially identical spatial positions of a test sample, wherein a measurement light beam has static single polarization state.

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    18. Methods, Systems and Computer Program Products for Processing Images Generated Using Fourier Domain Optical Coherence Tomography (FDOCT)

      Methods, Systems and Computer Program Products for Processing Images Generated Using Fourier Domain Optical Coherence Tomography (FDOCT)

      Methods, systems and computer program products for managing frequency domain optical coherence tomography (FDOCT) image resolution. A spectrum used to acquire an image of a subject is calibrated and default dispersion correction parameters are set. Default dispersion management parameters associated with a region of the image of the subject are also set. The image of the subject is acquires after setting the default dispersion correction parameters and the default dispersion management parameters. A quality of the acquired image is compared to a quality metric for the acquired image. The dispersion correction parameters are adjusted if the quality of the acquired ...

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    19. Tunable Surface Emitting Laser, Manufacturing Method Thereof, And Optical Coherence Tomography Apparatus Including Tunable Surface Emitting Laser

      Tunable Surface Emitting Laser, Manufacturing Method Thereof, And Optical Coherence Tomography Apparatus Including Tunable Surface Emitting Laser

      (EN) A tunable surface emitting laser includes on a semiconductor substrate (1) a first reflecting mirror (2); an active layer (4) on the first reflecting mirror which may be a DBR; a current confinement layer (6) resulting from partial oxidation of an AlGaAs layer; a conductive layer (7) on the current confinement layer (6) for providing a bias current to the active region; support portions (8) made from electrically insulating material like undoped GaAs; and a conductive film (9) which is provided above the conductive layer via a support portion (8) and which comprises a second reflecting mirror (11) like ...

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    20. Systems & Methods For Ocular Anterior Segment Tracking, Alignment, And Dewarping Using Optical Coherence Tomography

      Systems & Methods For Ocular Anterior Segment Tracking, Alignment, And Dewarping Using Optical Coherence Tomography

      The present application discloses methods and systems to track the anterior segment while establishing a position of the delay which will permit good control of the placement of anterior segment structures. This allows accurate dewarping by maximizing the amount of corneal surface that is imaged as well as reducing or eliminating overlap between real and complex conjugate images present in frequency-domain optical coherence tomography. A method to dewarp surfaces given partial corneal surface information is also disclosed.

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    21. Multi-Channel Optical Coherence Tomography

      Multi-Channel Optical Coherence Tomography

      An optical coherence tomography apparatus includes a multi-beam configuration unit comprising at least a first optical path having a first numerical aperture and a second optical path having a second numerical aperture. The multi-beam configuration unit orients the second optical path in a selected orientation in space relative to the first optical path. A scan system illuminates a sample with non-polarized light received from the multi-beam configuration unit and directs light returning from the sample to the first optical path and the second optical path. The multi-beam configuration unit directs light returning from the sample, along the first optical path ...

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    22. Fundus Analysis Device And Fundus Analysis Program

      Fundus Analysis Device And Fundus Analysis Program

      Provided is information useful for a diagnostic aid. A fundus analysis device for processing tomographic images acquired by an optical coherence tomography device for obtaining tomographic images of the fundus of an eye that is being tested and acquiring layer thickness information for the fundus of the eye being tested, the fundus analysis device being provided with: a first database for storing fundus layer thickness information relating to multiple eyes that have long ocular axis lengths; an acquiring means for acquiring tomographic images of the fundus of the eye being tested using an optical coherence tomography device; and an analysis ...

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      Mentions: Nidek
    23. Diagnostic Device For Dermatology With Merged Oct And Epiluminescence Dermoscopy

      Diagnostic Device For Dermatology With Merged Oct And Epiluminescence Dermoscopy

      Systems and methods for use of the imaging system are presented. In an embodiment, the imaging system includes a first optical path, a second optical path, a plurality of optical elements, a detector, and a processor. The first optical path guides a first beam of radiation associated with epiluminescence while the second optical path guides a second beam of radiation associated with optical coherence tomography.

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    24. Optical Probe For Optical Coherence Tomography And Manufacturing Method Therefor

      Optical Probe For Optical Coherence Tomography And Manufacturing Method Therefor

      Provided are: an OCT optical probe that is capable of reducing the reflected light that occurs at the interface region between the optical fiber and the lensed fiber; and a manufacturing method therefor. The OCT optical probe (10A) is provided with an optical fiber (22) for transmitting irradiated light and reflected and scattered light, and a lensed fiber (11), which is fused to the end face (22d) of the optical fiber (22) and is for collimating and emitting irradiated light into a living body and for collecting reflected and scattered light and guiding same to the end face (22d) of ...

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    25-48 of 285 « 1 2 3 4 5 ... 10 11 12 »
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