EP4185182A1 - Procédé et dispositif pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques - Google Patents

Procédé et dispositif pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques

Info

Publication number
EP4185182A1
EP4185182A1 EP21754929.4A EP21754929A EP4185182A1 EP 4185182 A1 EP4185182 A1 EP 4185182A1 EP 21754929 A EP21754929 A EP 21754929A EP 4185182 A1 EP4185182 A1 EP 4185182A1
Authority
EP
European Patent Office
Prior art keywords
parameters
illumination
image sensor
image
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21754929.4A
Other languages
German (de)
English (en)
Inventor
Dietrich Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Zeiss Meditec AG
Original Assignee
Carl Zeiss Meditec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Zeiss Meditec AG filed Critical Carl Zeiss Meditec AG
Publication of EP4185182A1 publication Critical patent/EP4185182A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0655—Control therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0008—Apparatus for testing the eyes; Instruments for examining the eyes provided with illuminating means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0016—Operational features thereof
    • A61B3/0033—Operational features thereof characterised by user input arrangements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/1015—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for wavefront analysis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/13—Ophthalmic microscopes
    • A61B3/135—Slit-lamp microscopes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
    • A61B3/14—Arrangements specially adapted for eye photography

Definitions

  • the present invention relates to a method and a device for setting and controlling parameters of the illumination field of ophthalmological devices. For example, brightness, color/color temperature, field shape, state of polarization or the like can be considered as parameters.
  • the parameters of the illumination field in laser-based applications are usually checked by analyzing a decoupled, defined part of the radiation.
  • the prior art similarly monitors the shape of the wavefront in optical systems.
  • a defined, small part of the radiation to be monitored is decoupled, recorded by a dedicated sensor (e.g. Shack-Hartmann sensor) and evaluated.
  • a dedicated sensor e.g. Shack-Hartmann sensor
  • the information obtained is used to specifically influence the wavefront.
  • parameters of the illumination field of ophthalmological devices such as slit lamps, fundus cameras or the like have hitherto not been set at all, not completely or only indirectly via scales to be calibrated on the operating elements.
  • the position of the control elements is usually determined from an ergonomic point of view, they are often not in the immediate vicinity of the assemblies to be influenced.
  • the routes for transferring the operating settings can be error-prone, so that in particular after a long period of use of the device, it cannot be ruled out that there will be deviations between the scale setting and the resulting light distribution properties.
  • the existence of the actually used parameters of the illumination field in electronic form is of particular importance, particularly with regard to the remotely controlled use of ophthalmological diagnostic devices (also known under the term telemedicine).
  • the external operator is dependent on reliable feedback on the current device configuration and in particular the real parameters of the illumination field are mandatory.
  • WO 2013/081619 A1 describes a system for ophthalmological imaging.
  • the present solution is based on an ophthalmological device that is controlled via a network and takes stereoscopic or three-dimensional images.
  • the system can be used remotely by one or more physicians to dynamically control every aspect of an ophthalmic device in real time over the network and verbally interact with the patient.
  • the recorded three-dimensional images of the patient's eyes are transmitted in real time to the doctor, who can thus perform an eye examination on at least part of an eye. Since the ophthalmological device is controlled in real time via a network, the doctor can vary and refine the images in order to optimize the examination.
  • comprehensive eye exams can be performed remotely with as much detail and clarity as if the doctor were at the same location as the patient.
  • the eye is illuminated with a slit diaphragm to enable magnification observation of the entire front of the segments of the eye, the cornea, sclera, iris, lens, conjunctiva, ventricle, corner angle, vitreous body and peritoneum perform retina.
  • various observation techniques that use slit lamp microscopes. These include both different lighting and image recording methods.
  • the lighting can, for example, be diffuse, direct and tangential or also as background lighting.
  • fluorescent staining photography or photography using a gonioscope or a fixing lens is widely used. It should be noted that in examinations using a slit lamp microscope, observation targets and observation techniques are arbitrarily combined and applied.
  • the settings of the optical system for example: irradiation angle, amount of illumination light, observation magnification, slit width, filter, but also of the image recording system, such as light sensitivity adjust sensitivity, shutter speed, aperture value, etc. accordingly. Only then are optimal images and examinations possible with little stress on the doctor and patient.
  • US 2014/0139807 A1 describes a slit lamp microscope with which the setting of the optical system can be easily adapted to the different conditions.
  • the slit lamp microscope has a memory unit configured to store correspondence information associated with each of Link standard setting conditions of lighting and/or observation system to several points of an eye.
  • Standard setting conditions are, for example: the value of the observation magnification, the slit width, the amount of light, the irradiation angle, the presence or absence of irradiation of the backlight light, and the presence or absence of a diffusing element, an aperture or a filter in the light path.
  • the standard setting conditions for this location are searched for from the correspondence information, compared with the previously recorded current setting states, and the setting states that differ from the standard setting conditions sought are identified.
  • the differing setting states are then output on a display unit in order to be able to correct them accordingly.
  • the solution described seems to be more about the use of the data in the form of the standard setting conditions, because the extraction of the data is only very vaguely indicated.
  • axially coupled potentiometers are used particularly often to record rotary or translatory movements.
  • Other possible sensors are based on detecting changes in the properties of resonant circuits, capacitances, the Hall effect or the like.
  • the necessary dynamic and value ranges for such sensors represent a particular challenge.
  • the slit width must be determined with an accuracy of less than 25 pm if slit widths are to be set between 100 pm and 20 mm.
  • their mechanical change in position must be determined, which is often very difficult given the cramped installation space.
  • sensors can sometimes also be necessary for sensors not to be arranged directly on the component influencing the light field parameters, but rather along the control chain somewhere between the actuator (e.g. rotary knob, sliding element, ...) and the component. This leads to systematic and random deviations, hysteresis and other errors, which can only be partially compensated for by calibration processes.
  • a disadvantage of the known systems is that different sensors, including signal and supply lines and evaluation electronics, are required to determine the very different parameters of the illumination field.
  • the present invention is based on the object of eliminating the disadvantages of the solutions known from the prior art and of developing a solution for setting and controlling a large number of parameters of the illumination and/or observation field of ophthalmological devices, which manages with as few sensors as possible and their Susceptibility to failure and mutual interference minimized.
  • This task is performed with the method for setting and checking parameters of the illumination field of ophthalmological devices, in which the desired illumination parameters are set, illumination radiation with the desired illumination parameters is generated, converted into a light distribution in the focal plane, part of the illumination radiation is decoupled, for analysis directed to a sensor element and the real illumination parameters of the illumination radiation are determined from the sensor data, solved in that a spatially resolving image sensor is used as the sensor element for analyzing the decoupled part of the illumination radiation.
  • Possible spatially resolving image sensors can be based on CMOS or CCD technology, for example, but other technologies are also conceivable in the future.
  • the part of the radiation that is coupled out reflects the real light distribution and does not change it as far as possible.
  • the digital camera's image sensor records image data continuously or sequentially, utilizing the dynamics of the image sensor.
  • the validity of the image data recorded by the image sensor is checked in a first step.
  • Calibration values are used to determine the parameters from the recorded image data. Furthermore, the ascertained, real lighting parameters are made available to the user or to software available to him as a numerical and/or visual representation and shown on a display or in an observation beam path.
  • the proposed solution is in particular for setting and checking parameters of the illumination field of ophthalmological devices intended, but can also be used in other technical fields, such as microscopy, for example.
  • Figure 1 a schematic representation of the sequence of the method according to the invention in the form of a program flow chart
  • Figure 2 a schematic representation of the inventive
  • the desired illumination parameters are set, illumination radiation is generated with the desired illumination parameters, converted into a light distribution in the focal plane, part of the illumination radiation is decoupled, for analysis on a Sensor element passed and determined from the sensor data, the real lighting parameters of the illumination radiation.
  • a spatially resolving image sensor is used as the sensor element for analyzing the decoupled part of the lighting radiation.
  • the geometric resolution of the sensor can be adapted to the accuracy required by the application. This means that very inexpensive sensors can also be used for a lower sensor resolution, e.g. comparable to those of optical mice (computer input devices).
  • the spatially resolving image sensor of a camera is particularly preferably used.
  • the lighting parameters are specified by the system or the user in the form of information and set in such a way that a desired light distribution is generated in one/the focal plane.
  • the following lighting parameters are used to generate a desired light distribution: brightness, color, light field shape, polarization and the like.
  • the brightness of a light distribution can be changed by changing the current or voltage at the light source(s) and the light color or color temperature with the help of filters or by combining different colored light sources and adjusting their targeted amplification or weakening and correcting them if necessary.
  • polarizers are required to change their polarization.
  • image data are recorded continuously or sequentially by the spatially resolving image sensor.
  • the dynamics can be particularly advantageous here of the image sensor is exploited and used as a light output detector.
  • camera parameters e.g. exposure time or amplification
  • algorithm e.g. binary search
  • the image data recorded by the spatially resolving image sensor is analyzed and the parameters are determined from this using adapted and/or optimized algorithms.
  • the recorded image data can be checked for validity.
  • the image data is examined using an algorithm to determine whether there are one or more luminous fields in the camera images. Only a single illuminated field is expected. If several are found, it is possible that the system has not been set up optimally. Then the following algorithm steps are not necessarily valid either. Ideally, the user should be informed of this.
  • the parameters are then determined using adapted and/or optimized algorithms from the image data recorded by the spatially resolving image sensor.
  • Calibration values are used to determine the parameters, which, for example, compare the size, angle and color representation between the image field and the analyzed result of the image sensor.
  • the illuminated field and its edges are detected using an algorithm from the image data recorded by the image sensor.
  • the distance between the two parallel edges corresponds to the width of the gap and the distance perpendicular to it corresponds to the height of the gap.
  • the center line between the two detected edges represents the reference to the rotation angle evaluation of the gap position.
  • the color of the luminous field can be deduced from the intensity of the differently colored partial images of the image data recorded by the image sensor.
  • the determined real lighting parameters of the lighting radiation are stored for documentation and/or reproduction.
  • the parameters determined from the recorded images and their size can be stored as meta-information on the recorded image or used as an input variable for a control circuit of the lighting module.
  • the real lighting parameters are made available to the user as a numerical and/or pictorial representation. This is done, for example, on a display or directly in the observation beam path.
  • FIG. 1 shows a possible course of the method according to the invention in the form of a program flow chart.
  • part of the light distribution generated is decoupled, analyzed and the real lighting parameters of the lighting radiation are determined therefrom.
  • an image is recorded by the spatially resolving image sensor, checked for validity and repeated in the event of a lack of validity, with the image recording parameters being able to be adjusted if necessary.
  • the illuminated field is detected from the valid image data, also checked for validity and repeated if not available, whereby the user can receive feedback about this.
  • the edges of the slit image are detected from the valid light fields, their dimensions are determined and preferably displayed for the user. Additional calibration data can be used for this.
  • the angle of rotation of the slit image is determined and preferably also displayed to the user.
  • the center line between the two detected long edges represents the reference to the rotation angle evaluation. Additional calibration data can also be used for this.
  • the intensity is determined and the color of the illuminated field is deduced from the intensity of different-colored partial images.
  • the proposed arrangement for setting and checking parameters of the illumination field of ophthalmological devices consists of an actuating unit for setting the desired illumination parameters, an illumination unit for generating illumination radiation with the desired illumination parameters, a decoupling element for decoupling part of the illumination radiation, a sensor element for analysis the decoupled part of the illumination radiation and an evaluation unit for evaluating the sensor data and for determining the real lighting parameters of the illumination radiation.
  • the sensor element for analyzing the extracted portion of the illumination radiation is a spatially resolving image sensor that can record both intensities and information in a spatially resolved manner.
  • the sensor element is the spatially resolving image sensor of a camera.
  • the image sensor In order to be able to evaluate color information, the image sensor must have spectrally differently reacting.
  • the BAYER matrix filter found in many cameras is also suitable for this purpose.
  • the lighting unit consists of several spectrally different and separately controllable light sources.
  • the lighting unit also has a variable aperture to increase the dynamic range.
  • the following lighting parameters are used to generate a desired light distribution: brightness, color, light field shape, polarization and the like.
  • the brightness of a light distribution can be adjusted by changing the current or voltage at the light source(s) and the light color or color temperature with the help of filters or by combining different colored light sources and their more targeted Set amplification or attenuation and correct if necessary.
  • the field shape of the light distribution can be changed by screens, DMD, ELCoS, or similar.
  • part of the radiation that actually reflects the real light distribution is coupled out.
  • the beam splitter provided for this purpose forwards this part of the radiation to the spatially resolving image sensor serving as the sensor element for analysis.
  • the decoupling element for decoupling part of the illumination radiation can also be an already existing element in the form of a mirror or prism, with an optically active surface being designed as a partially transparent layer instead of as a reflective optical layer.
  • the spatially resolving image sensor is designed to record image data continuously or sequentially and to transmit it to the evaluation unit for its evaluation and for determining the real illumination parameters of the illumination radiation.
  • the evaluation unit has a microprocessor for analyzing the images recorded by the image sensor and for determining the real illumination parameters of the illumination radiation.
  • the microprocessor analyzes the recorded image data by using adapted/optimized algorithms and determines the parameters and their size.
  • calibration values are preferably used which, for example, once compare the size, angle and color representation between the set, desired lighting parameters and the image data recorded by the image sensor and characterizing the real light distribution in the focal plane.
  • the arrangement according to the invention can have a memory unit for documenting and/or reproducing the real illumination parameters of the illumination radiation.
  • the determined real illumination parameters of the illumination radiation can be stored as input variables of a control loop for the illumination unit or as meta-information on the recorded image data.
  • the arrangement can have an element for the numerical and/or pictorial representation of the real lighting parameters.
  • the numerical and/or pictorial representation can take place on a display or also directly in the observation beam path, for which purpose the arrangement has an element for coupling into an observation beam path.
  • FIG. 2 shows a schematic representation of the arrangement according to the invention using the example of a slit lamp.
  • the illumination parameters 2 desired by way of example are set on the actuation unit 1 in order to generate the corresponding illumination radiation distribution in the focal plane 5 with the aid of the illumination unit 3 and the gap generation unit 4 (represented in simplified form).
  • a part of the illumination radiation is decoupled from the beam splitter 6 and imaged on the spatially resolving image sensor 7 for analysis of the illumination radiation.
  • the microprocessor 8 evaluates the sensor data transmitted by the spatially resolving image sensor 7, offsets them against any existing calibration data, thereby determines the real illumination parameters of the illumination radiation and shows them on a display 9.
  • the arrangement has an additional sensor element for polarization-dependent analysis of the decoupled part of the illumination radiation. This is the only way to be able to detect polarization-dependent properties.
  • a Stokes setup could be used for this purpose, for example, in which at least 4 different polarization states (parallel or serial) are generated, measured and the polarization state of the radiation is then back-calculated from them.
  • An advantageous embodiment provides that an existing camera observing the actual image field has special algorithms for analyzing and evaluating the lighting information from the overall image.
  • the solution according to the invention a method and an arrangement for setting and checking parameters of the illumination field of ophthalmological devices are made available, with which the disadvantages of the solutions known from the prior art are eliminated.
  • the proposed solution makes it possible to set and control a large number of parameters of the illumination and/or observation field of ophthalmological devices while minimizing the susceptibility to faults and mutual influence of the sensors.
  • the fact that the solution can record and analyze several parameters at the same time with just one sensor is particularly advantageous.
  • the use of the image sensor of a camera also has the advantage that the entire structure can be miniaturized considerably.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Ophthalmology & Optometry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Eye Examination Apparatus (AREA)
  • Image Analysis (AREA)

Abstract

L'invention concerne une solution pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques. Parmi ces paramètres figurent par exemple la luminosité, la couleur/température de couleur, la configuration de champ, l'état de polarisation. Le système selon l'invention comprend une unité d'actionnement conçue pour ajuster les paramètre d'éclairage souhaités, une unité d'éclairage pour générer un rayonnement d'éclairage avec les paramètres d'éclairage souhaités, un élément d'extraction pour extraire une partie du rayonnement d'éclairage, un élément de détection pour analyser la partie extraite du rayonnement d'éclairage et une unité d'évaluation pour évaluer les données détectées et pour déterminer les paramètres d'éclairage réels du rayonnement d'éclairage. Selon l'invention, l'élément de détection est un capteur d'image à résolution spatiale. Bien que la solution selon l'invention soit prévue pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques, elle peut aussi trouver une application dans d'autres domaines techniques, par exemple en microscopie.
EP21754929.4A 2020-07-24 2021-07-21 Procédé et dispositif pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques Pending EP4185182A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020209379.2A DE102020209379A1 (de) 2020-07-24 2020-07-24 Verfahren und Vorrichtung zur Einstellung und Kontrolle von Parametern des Beleuchtungsfeldes ophthalmologischer Geräte
PCT/EP2021/070317 WO2022018108A1 (fr) 2020-07-24 2021-07-21 Procédé et dispositif pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques

Publications (1)

Publication Number Publication Date
EP4185182A1 true EP4185182A1 (fr) 2023-05-31

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21754929.4A Pending EP4185182A1 (fr) 2020-07-24 2021-07-21 Procédé et dispositif pour ajuster et commander des paramètres du champ d'éclairage d'appareils ophtalmologiques

Country Status (6)

Country Link
US (1) US20230284889A1 (fr)
EP (1) EP4185182A1 (fr)
JP (1) JP2023534526A (fr)
CN (1) CN116171126A (fr)
DE (1) DE102020209379A1 (fr)
WO (1) WO2022018108A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11587528B2 (en) * 2021-02-12 2023-02-21 Microsoft Technology Licensing, Llc Optimized facial illumination from adaptive screen content

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6631991B2 (en) * 2001-08-31 2003-10-14 Adaptive Optics Associates, Inc. Ophthalmic instrument having hartmann wavefront sensor deriving location of spots with spot fitting techniques
WO2005006943A2 (fr) * 2003-07-03 2005-01-27 Medibell Medical Vision Technologies, Ltd. Procede et systeme d'eclairage pour obtenir des images couleurs par eclairage ophtalmique transcleral
US8488895B2 (en) * 2006-05-31 2013-07-16 Indiana University Research And Technology Corp. Laser scanning digital camera with pupil periphery illumination and potential for multiply scattered light imaging
US8807751B2 (en) * 2008-04-22 2014-08-19 Annidis Health Systems Corp. Retinal fundus surveillance method and apparatus
WO2010037485A1 (fr) * 2008-09-30 2010-04-08 Carl Zeiss Meditec Ag Agencements et procédés pour la mesure d'un mouvement de l'œil, en particulier d'un mouvement du fond de l'œil
JPWO2012172907A1 (ja) 2011-06-14 2015-02-23 株式会社トプコン 細隙灯顕微鏡
WO2013081619A1 (fr) 2011-12-01 2013-06-06 University Of Miami Système d'imagerie ophtalmique
EP3019070A4 (fr) * 2013-07-12 2017-03-22 Annidis Health Systems Corp. Procédé et appareil de surveillance de fond rétinien

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DE102020209379A1 (de) 2022-01-27
JP2023534526A (ja) 2023-08-09
CN116171126A (zh) 2023-05-26
WO2022018108A1 (fr) 2022-01-27
US20230284889A1 (en) 2023-09-14

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