Patents Assigned to OTI Ophthalmic Technologies Inc.
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Method for correcting patient motion when obtaining retina volume using optical coherence tomography
Patent number: 7997729Abstract: A computer-implemented method of correcting for motion of a sample during OCT imaging obtains a series of cross-sectional volume scans through the sample at different positions on a first coordinate axis, obtains at least two cross-sectional alignment scans in planes intersecting said volume scans at an angle, and stores the alignment scans and the volume scans in memory. The alignment scans are matched to the volume scans at lines of intersection thereof to determine the relative displacement of the volume scans to the sample due to sample motion. The relative displacement is used to correct for motion of the sample between successive volume scans.Type: GrantFiled: October 8, 2008Date of Patent: August 16, 2011Assignee: OTI Ophthalmic Technologies Inc.Inventors: Duncan McLean, Justin Pedro, Clive Hayward -
Patent number: 7841719Abstract: A method of determining the external three dimensional external contour of a curved object in one step, which produces and processes a single composite en-face OCT image (a C-scan), which involves generating and processing a set of two dimensional image contours of the object in different image planes using a plurality of optical path lengths in an OCT system with all such contours present in the composite en-face OCT image. The multiple path lengths are generated using a multiple delay element in bulk or in fiber inserted in the path from the source to the OCT system or in one of the OCT arms. The image planes have a known spatial relationship with each other. The three dimensional external contour of the curved object is computed from the two dimensional contours in the composite en-face OCT image and the known spatial relationship between the image planes.Type: GrantFiled: January 24, 2008Date of Patent: November 30, 2010Assignee: OTI Ophthalmic Technologies IncInventor: Adrian G. H. Podoleanu
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Patent number: 7690791Abstract: A visual acuity examination is performed on a patient by bringing a confocal imaging apparatus up to a patient's eye. Stimuli at various points in the patient's field of view are generated while the patient fixates on a point. The patient's responses to the stimuli are recorded with the movement of the eye with is tracked with the aid of the confocal imaging apparatus. The position of said stimuli on the retina is corrected to take into account any movement of the eye between stimuli.Type: GrantFiled: November 5, 2008Date of Patent: April 6, 2010Assignee: OTI Ophthalmic Technologies Inc.Inventors: Rishard Weitz, Duncan McLean, John Rogers, Justin Pedro
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Publication number: 20100067020Abstract: An optical coherence tomography (OCT) apparatus includes an optical source, an interferometer generating an object beam and a reference beam, a transverse scanner for scanning an object with said object beam, and a processor for generating an OCT image from an OCT signal returned by said interferometer. At least the optical source, the interferometer, and the scanner are mounted on a common translation stage displaceable towards and away from said object. A dynamic focus solution is provided when the scanner and a folded object path are placed on the translation stage.Type: ApplicationFiled: June 28, 2007Publication date: March 18, 2010Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventor: Adrian G.H. Podoleanu
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Patent number: 7649629Abstract: Apparatus for obtaining depth profile information from a transparent object, includes a confocal scanner for producing an en-face image of the object in an x-y plane, a spectral optical coherence tomography (OCT) apparatus for producing an OCT scan along at least one line in the z direction passing through a point in the x-y plane, and a display device. A processing unit displays on the display device the en-face image and an indication of the position of the point so as to permit the location of the OCT scan to be determined on the en-face image. The position point can be adjusted by the user when viewing the image. In other embodiments, SLO and OCT images are produced from a common aperture, and spectral OCT images are produced simultaneously with fluorescence images.Type: GrantFiled: October 5, 2007Date of Patent: January 19, 2010Assignee: OTI Ophthalmic Technologies, Inc.Inventors: John Rogers, Mark Hathaway
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Patent number: 7594730Abstract: OCT cross section images of a part of a curved object are displayed by creating a series of image points and placing each image point into a corrected image in such a way that the positions of scattering points within the image coincide with or are at least closer to their real spatial distribution within the curved object.Type: GrantFiled: March 11, 2005Date of Patent: September 29, 2009Assignee: OTI Ophthalmic Technologies Inc.Inventor: Adrian Podoleanu
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Publication number: 20090153874Abstract: In an OCT apparatus, an object light beam is returned from a target and interferes with a reference light beam. Image information is obtained from a depth Z in the target that depends on the optical path difference between the object and reference beams with a resolution that depends on the coherence length of the light. A scanner transversely scans the target with the object beam over a plurality of image points defined by the resolution of the apparatus. Interface optics directs the reference and object beams onto an array of detector elements such that the optical path difference between the reference beam and the object beam varies across the array. The reference beam and the object beam interfere with each other over the array of detector elements for individual image points on the target during each transverse scan. A memory stores a subset of data points corresponding to each individual image point obtained from each detector elements of the array.Type: ApplicationFiled: October 31, 2006Publication date: June 18, 2009Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventors: John A. Rogers, Mark Hathaway
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Publication number: 20090141240Abstract: A visual acuity examination is performed on a patient by bringing a confocal imaging apparatus up to a patient's eye. Stimuli at various points in the patient's field of view are generated while the patient fixates on a point. The patient's responses to the stimuli are recorded with the movement of the eye with is tracked with the aid of the confocal imaging apparatus. The position of said stimuli on the retina is corrected to take into account any movement of the eye between stimuli.Type: ApplicationFiled: November 5, 2008Publication date: June 4, 2009Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventors: Rishard Weitz, Duncan McLean, John Rogers, Justin Pedro
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Patent number: 7535577Abstract: OCT apparatus includes an interferometer, having an input beam splitter and a 50/50 output splitter. The splitting ratio of the input splitter may be optimized depending on the source power of light source and on the mismatch of the balanced receiver. The input splitter is a plate beam-splitter to minimize the stray reflected light in the interferometer and allow sequential operation of the apparatus in the OCT or in the confocal regime. The switching between the two regimes may be at will, or synchronous with the en-face scanning which results in quasi-simultaneous OCT/confocal imaging or in alternatives frames, confocal and OCT. By using polarization sensitive elements, two channels are provided in each regime, OCT and confocal. The two confocal polarization sensitive channels may allow adjustments of compensators prior to OCT measurements or OCT imaging.Type: GrantFiled: July 26, 2007Date of Patent: May 19, 2009Assignee: OTI Ophthalmic Technologies Inc.Inventors: Adrian Gh. Podoleanu, David A. Jackson, John A. Rogers, George M. Dobre, Radu G. Cucu
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METHOD FOR CORRECTING PATIENT MOTION WHEN OBTAINING RETINA VOLUME USING OPTICAL COHERENCE TOMOGRAPHY
Publication number: 20090103049Abstract: A computer-implemented method of correcting for motion of a sample during OCT imaging obtains a series of cross-sectional volume scans through the sample at different positions on a first coordinate axis, obtains at least two cross-sectional alignment scans in planes intersecting said volume scans at an angle, and stores the alignment scans and the volume scans in memory. The alignment scans are matched to the volume scans at lines of intersection thereof to determine the relative displacement of the volume scans to the sample due to sample motion. The relative displacement is used to correct for motion of the sample between successive volume scans.Type: ApplicationFiled: October 8, 2008Publication date: April 23, 2009Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventors: Duncan McLean, Justin Pedro, Clive Hayward -
Publication number: 20090079994Abstract: A method of building up a three dimensional OCT image of an object having a limited region sensitive to movement of a scanning beam performs an OCT scan in a scanning pattern that results in said limited region, typically the fovea of the eye, being scanned last.Type: ApplicationFiled: September 12, 2008Publication date: March 26, 2009Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventors: Justin Pedro, Clive Hayward, Duncan McLean
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Publication number: 20090080739Abstract: A method of performing spectral OCT imaging on a target involves repeatedly scanning said target along a transverse scanning line with an object beam derived from an OCT interferometer having a narrowband source. The wavelength of the narrowband source is modulated over a range of wavelengths at a rate that is slow relative to the rate of scanning the target. The object beam returned from the target is detected to produce a set of data obtained from multiple scans along said scanning line over the entire range of wavelengths. The data is then processed to extract an OCT image (typically a B-scan) of the target containing depth information.Type: ApplicationFiled: October 31, 2006Publication date: March 26, 2009Applicant: OTI Ophthalmic Technologies Inc..Inventors: John A. Rogers, Mark Hathaway
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Patent number: 7417741Abstract: A scanningdelay line for use in optical coherence tomography apparatus has a tiltable mirror, and optical convergence means for converging light incident, a dispersive element for dispersing light incident, and an optical-redirector for changing the direction of an icident beam light.Type: GrantFiled: August 31, 2005Date of Patent: August 26, 2008Assignee: OTI Ophthalmic Technologies Inc.Inventors: Adrian Gh. Podoleanu, John A. Rogers
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Publication number: 20080170204Abstract: A method of determining the external three dimensional external contour of a curved object in one step, which produces and processes a single composite en-face OCT image (a C-scan), which involves generating and processing a set of two dimensional image contours of the object in different image planes using a plurality of optical path lengths in an OCT system with all such contours present in the composite en-face OCT image. The multiple path lengths are generated using a multiple delay element in bulk or in fiber inserted in the path from the source to the OCT system or in one of the OCT arms. The image planes have a known spatial relationship with each other. The three dimensional external contour of the curved object is computed from the two dimensional contours in the composite en-face OCT image and the known spatial relationship between the image planes.Type: ApplicationFiled: January 24, 2008Publication date: July 17, 2008Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventor: Adrian G.H. Podoleanu
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Publication number: 20080074617Abstract: OCT cross section images of a part of a curved object are displayed by creating a series of image points and placing each image point into a corrected image in such a way that the positions of scattering points within the image coincide with or are at least closer to their real spatial distribution within the curved object.Type: ApplicationFiled: March 11, 2005Publication date: March 27, 2008Applicant: Oti Ophthalmic Technologies Inc.Inventor: Adrian Podoleanu
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Patent number: 7330273Abstract: An optical coherence tomography (OCT) apparatus includes an optical source, an interferometer generating an object beam and a reference beam, a transverse scanner for scanning an object with said object beam, and a processor for generating an OCT image from an OCT signal returned by said interferometer. At least the optical source, the interferometer, and the scanner are mounted on a common translation stage displaceable towards and away from said object. A dynamic focus solution is provided when the scanner and a folded object path are placed on the translation stage.Type: GrantFiled: February 11, 2005Date of Patent: February 12, 2008Assignee: OTI Ophthalmic Technologies Inc.Inventors: Adrian Gh. Podoleanu, John A. Rogers
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Publication number: 20080013078Abstract: OCT apparatus includes an interferometer, having an input beam splitter and a 50/50 output splitter. The splitting ratio of the input splitter may be optimized depending on the source power of light source and on the mismatch of the balanced receiver. The input splitter is a plate beam-splitter to minimize the stray reflected light in the interferometer and allow sequential operation of the apparatus in the OCT or in the confocal regime. The switching between the two regimes may be at will, or synchronous with the en-face scanning which results in quasi-simultaneous OCT/confocal imaging or in alternatives frames, confocal and OCT. By using polarization sensitive elements, two channels are provided in each regime, OCT and confocal. The two confocal polarization sensitive channels may allow adjustments of compensators prior to OCT measurements or OCT imaging.Type: ApplicationFiled: July 26, 2007Publication date: January 17, 2008Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventors: Adrian Podoleanu, David Jackson, John Rogers, George Dobre, Radu Cucu
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Publication number: 20070076223Abstract: OCT apparatus includes an interferometer, having an input beam splitter and a 50/50 output splitter. The splitting ratio of the input splitter may be optimized depending on the source power of light source and on the mismatch of the balanced receiver. The input splitter is a plate beam-splitter to minimize the stray reflected light in the interferometer and allow sequential operation of the apparatus in the OCT or in the confocal regime. The switching between the two regimes may be at will, or synchronous with the en-face scanning which results in quasi-simultaneous OCT/confocal imaging or in alternatives frames, confocal and OCT. By using polarization sensitive elements, two channels are provided in each regime, OCT and confocal. The two confocal polarization sensitive channels may allow adjustments of compensators prior to OCT measurements or OCT imaging.Type: ApplicationFiled: November 20, 2006Publication date: April 5, 2007Applicant: OTI OPHTHALMIC TECHNOLOGIES INC.Inventors: Adrian Podoleanu, David Jackson, John Rogers, George Dobre, Radu Cucu
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Patent number: 7139077Abstract: OCT apparatus includes an interferometer, having an input beam splitter and a 50/50 output splitter. The splitting ratio of the input splitter may be optimized depending on the source power of light source and on the mismatch of the balanced receiver. The input splitter is a plate beam-splitter to minimize the stray reflected light in the interferometer and allow sequential operation of the apparatus in the OCT or in the confocal regime. The switching between the two regimes may be at will, or synchronous with the en-face scanning which results in quasi-simultaneous OCT/confocal imaging or in alternatives frames, confocal and OCT. By using polarization sensitive elements, two channels are provided in each regime, OCT and confocal. The two confocal polarization sensitive channels may allow adjustments of compensators prior to OCT measurements or OCT imaging.Type: GrantFiled: July 8, 2005Date of Patent: November 21, 2006Assignee: OTI Ophthalmic Technologies Inc.Inventors: Adrian Gh. Podoleanu, David A. Jackson, John A. Rogers, George M. Dobre, Radu G. Cucu
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Patent number: 7113818Abstract: Apparatus for high resolution imaging of a moving object comprises a source of low coherence light, an optical coherence tomography imaging instrument or a dual channel, optical coherence tomography/confocal imaging instrument, a transverse scanner, an interferometer, depth adjustment means, and interface optics. First and an optional second sensing blocks sense the axial and respectively the transverse position of the object. A splitting element is shared so that the interface optics and the sensing blocks have a common axis of light transmitted to and from the object. Timing means establishes a timing, and timing intervals and reference times for images as they are taken. The acceptability of each scanned image is determined according to predetermined criteria. A series of en-face OCT images, or of longitudinal OCT images of the object may be taken at different depths or transverse coordinates, and the stack of collected images is used to build 3D profiles of the object.Type: GrantFiled: April 8, 2002Date of Patent: September 26, 2006Assignee: OTI Ophthalmic Technologies Inc.Inventors: Adrian Podoleanu, John Rogers