Optos Plc

Keysight Technologies, Inc.

Alan Anderson

Praveen Cheriyan Ashok

Alistair Gorman

Tomoharu Fujiwara

Mariko Hirokawa

Yasushi Tanabe

Gonzalo Muyo

Jano Van Hemert

Hiroshi Kasai

Daniel Hurst

Michael Dieudonné

Miguel Angel Preciado

Jan Erik Schiefer

Ian Gourlay

Francisco Javier Garcia Garcia

Margaret Catherine Normand

Iain Gourlay

Tadashi Umezaki

Hiroshi Kintou

Ewan Rycroft

Bavishna Balagopal

Paul McCool

Praveen Ashok

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.

Multimode eye analyzing system, method and computer-readable medium

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 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 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 the reliability indictor to indicate that the correction data is unreliable, and otherwise to indicate that the correction data is reliable.

Volumetric OCT image data processing

A system for managing a cellular network implemented based on O-RAN standards includes an O-DU for generating a first control-plane message requesting a first set of radio resources responsive to a scheduled uplink transmission from a user device, where the first set of radio resources includes an assigned portion of a carrier signal allocated for the uplink transmission; an interposer unit for receiving the first control-plane message, and generating a second control-plane message requesting a second set of radio resources including a remaining portion of the carrier signal; and an O-RU for receiving the first and second control-plane messages, receiving the uplink transmission, and generating user-plane message(s) including first and second digitized data correlated with the first and second control-plane messages. The interposer unit sends the first digitized data to the O-DU without sending the second digitized data, and monitors the carrier signal using the first and second digitized data.

System and method for managing a cellular network

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.

Ophthalmic device

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.

Optical element control

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.

There is provided an ocular image capturing device comprising an ocular image generating module operable to generate an image of a subject's eye based on light reflected from the eye, and a determination module arranged to determine whether or not at least a portion of a pupil region of the generated image is within a predetermined permissible region within the generated image, and to generate a signal that is indicative of the determination, the pupil region being an image of at least a portion of the pupil of the eye.

Ocular image capturing device

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.

Generation of dewarped OCT B-scan images

A system and method for detecting passive intermodulation (PIM) interference in cellular networks are provided that do not require the base station or any sectors of it to be taken offline, that eliminate the need for a technician to make a visit to the cellular site to perform PIM testing, that enable multiple uplink connections to be remotely tested simultaneously, that enable cellular networks to be tested that do not have an accessible connection point to the RF chain, and that enable gradually deteriorating performance due to PIM interference and intermittent PIM interference problems to be detected.

Growing community of inventors

Scotland, United Kingdom

Alan Anderson