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公开(公告)号：US20200237217A1
公开(公告)日：2020-07-30
申请号：US16637075
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Alan Anderson , Ian Gourlay , Praveen Ashok
Abstract: An ophthalmic device including an illumination module which scans light across a region of the retina of an a eye when the pupil is disposed at a focal point of the illumination module. The ophthalmic device further comprises components (2, 3-1, 4-1) for: aligning the pupil with the focal point; monitoring a position of the pupil relative to the focal point and maintaining the alignment based on the monitored position; aligning a scan location of the illumination module on the retina to a target scan location while the alignment of the pupil with the focal point is being maintained, wherein the illumination module performs scan at the target scan location The ophthalmic device further maintains the scan location at the target scan location while the alignment of the pupil with the focal point is being maintained, using scan location correction information based on retinal feature information.
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公开(公告)号：US20200166676A1
公开(公告)日：2020-05-28
申请号：US16636999
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Alan Anderson , Praveen Ashok , Hiroshi Kasai , Alistair Gorman
Abstract: An optical system comprising: an optical element having an optical property responsive to an applied signal, a variation of the optical property with the signal exhibiting hysteresis in a first range of values and no hysteresis in a second range of values of the signal; a memory storing data representing a hysteresis curve which indicates the variation of the optical property with increasing and decreasing values of the signal; and a controller which continuously controls the optical property by: generating, based on the stored data, a cyclic signal having a discontinuity in each cycle of the cyclic signal, and setting the discontinuity size in each cycle based on the stored data such that a part of the variation of the optical property with the cyclic signal coincides with a part of the variation represented by the stored data; and applying the cyclic signal to the optical element.
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公开(公告)号：US11617509B2
公开(公告)日：2023-04-04
申请号：US16637075
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Alan Anderson , Iain Gourlay , Praveen Ashok
Abstract: An ophthalmic device including an illumination module which scans light across a region of the retina of an eye when the pupil is disposed at a focal point of the illumination module. The ophthalmic device further comprises components (2, 3-1, 4-1) for: aligning the pupil with the focal point; monitoring a position of the pupil relative to the focal point and maintaining the alignment based on the monitored position; aligning a scan location of the illumination module on the retina to a target scan location while the alignment of the pupil with the focal point is being maintained, wherein the illumination module performs a scan at the target scan location. The ophthalmic device further maintains the scan location at the target scan location while the alignment of the pupil with the focal point is being maintained, using scan location correction information based on retinal feature information.
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公开(公告)号：US20220296094A1
公开(公告)日：2022-09-22
申请号：US17205501
申请日：2021-03-18
Applicant: OPTOS PLC
Inventor： Praveen Ashok , Alan Anderson
Abstract: A multimode optical coherence tomography (OCT) imaging system comprises a light source arranged to emit coherent light in a path to scan a sample. An optical parameter unit is arranged in the path and is operable in at least one selected mode from among a plurality of available operating modes, including at least a first mode, a second mode and a third mode. A detector is arranged to detect reflected light, the reflected light being light reflected in the path as a result of the coherence light scanning the sample. A controller is arranged to control at least one of the light source or the optical parameter unit. The first, second and third modes include a retina mode, anterior segment mode, and biometry mode, respectively. Also provided are a method for operating a multimode OCT imaging system, and a computer-readable storage medium storing a program for performing the method.
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公开(公告)号：US12274499B2
公开(公告)日：2025-04-15
申请号：US17205501
申请日：2021-03-18
Applicant: OPTOS PLC
Inventor： Praveen Ashok , Alan Anderson
Abstract: A multimode optical coherence tomography (OCT) imaging system comprises a light source arranged to emit coherent light in a path to scan a sample. An optical parameter unit is arranged in the path and is operable in at least one selected mode from among a plurality of available operating modes, including at least a first mode, a second mode and a third mode. A detector is arranged to detect reflected light, the reflected light being light reflected in the path as a result of the coherence light scanning the sample. A controller is arranged to control at least one of the light source or the optical parameter unit. The first, second and third modes include a retina mode, anterior segment mode, and biometry mode, respectively. Also provided are a method for operating a multimode OCT imaging system, and a computer-readable storage medium storing a program for performing the method.
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Patent Agency Ranking
公开(公告)号：US20250082199A1
公开(公告)日：2025-03-13
申请号：US18884958
申请日：2024-09-13
Applicant: Optos plc
Inventor： Miguel Preciado , Paul McCool , Margaret Normand , Ewan Rycroft , Alan Anderson
Abstract: A Fourier-domain OCT apparatus for acquiring optoretinography data, comprising: an optical system which applies an optical stimulus to a retina of an eye; an OCT imaging system which acquires OCT data from the retina; and a controller which: controls the OCT imaging system to acquire OCT data of a plurality of portions of the retina such that, for each portion, at least some of the OCT data from the portion is acquired after a respective optical stimulus has been applied to the portion; generates, based on the OCT data, respective ORG data for each portion which indicates the response of the portion to the optical stimulus; and stores respective ORG data generated for each portion in association with a respective position in a visual field of the eye that is optically conjugate with a position of the portion on the retina.
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公开(公告)号：US20220142471A1
公开(公告)日：2022-05-12
申请号：US17492583
申请日：2021-10-02
Applicant: OPTOS PLC
Inventor： Praveen Ashok , Alan Anderson
Abstract: A method of processing C-scan data, which comprises a sequence of B-scans of an imaging target acquired by an OCT imaging system, to generate correction data for compensating for axial displacements between B-scans in the sequence caused by a relative motion of the OCT imaging system and the imaging target that varies a distance therebetween during acquisition of the B-scans, the correction data being generated by determining, for each pair of adjacent B-scans of a plurality of pairs of adjacent B-scans in the sequence, a respective indicator of an axial shift between respective representations of a common ocular feature in the adjacent B-scans; and determining, from a variation of the determined indicators with locations of the corresponding pairs of adjacent B-scans in the sequence, a first frequency component of the variation which is indicative of the relative motion during acquisition of the B-scans.
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公开(公告)号：US20200320754A1
公开(公告)日：2020-10-08
申请号：US16375152
申请日：2019-04-04
Applicant: Optos Plc
Inventor： Praveen Ashock , Daniel Hurst , Alan Anderson
Abstract: 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 from the acquired sequence, to select, for each array, a respective A-scan from the sequence such that A-scans are selected from the cropped part and have uniformly spaced scan locations; and storing, for each array, a respective pixel array identifier in association with a respective identifier of the selected A-scan.
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公开(公告)号：US20250143568A1
公开(公告)日：2025-05-08
申请号：US19014662
申请日：2025-01-09
Applicant: Optos plc
Inventor： Praveen Ashok , Alan Anderson
Abstract: A method of processing B-scans acquired by an OCT imaging system to generate correction data for compensating for axial displacements between B-scans caused by a variation in distance between the OCT imaging system and an imaging target, and to generate a reliability indicator indicative of a reliability of the correction data. The correction data is generated (S10) by determining, for each pair of adjacent B-scans, a respective indicator of an axial shift between respective representations of a common ocular feature in the adjacent B-scans. The reliability indicator is generated by: calculating (S20) values indicative of speeds or accelerations of the imaging target relative to the OCT imaging system when pairs of B-scans were acquired; where at least a predetermined number of calculated values exceed a threshold, setting (S40A) the reliability indictor to indicate that the correction data is unreliable, and otherwise (S40B) to indicate that the correction data is reliable.
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公开(公告)号：US11669968B2
公开(公告)日：2023-06-06
申请号：US16637023
申请日：2017-08-14
Applicant: Optos PLC
Inventor： Praveen Ashok , Alan Anderson , Gonzalo Muyo , Alistair Gorman , Jano Van Hemert
CPC classification number: G06T7/0014 , A61B3/0008 , A61B3/0025 , A61B3/102 , A61B3/1025 , A61B3/12 , G06T2207/30041 , G06T2207/30204
Abstract: A method of controlling an ophthalmic device operable to image an imaging region of a retina and concurrently illuminate an illumination region of the retina, the method including acquiring a reference retinal image by imaging a reference imaging area of the retina; designating a target in the reference retinal image; acquiring a current retinal image of an initial imaging region within the reference imaging area; moving the imaging region from the initial imaging region to a destination imaging region using the target and the reference retinal image, and acquiring a retinal image of the destination imaging region; illuminating the illumination region while the imaging region is the destination imaging region; acquiring one or more retinal images while the illumination module is being illuminated; and comparing a marker retinal image based on the one or more retinal image(s) with a comparison image based on the reference retinal image.
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