A Dynamic Target Control Method and System Based on Dual-Band OCT Collaborative Imaging

Abstract

This invention belongs to the field of medical device technology. It provides a dynamic target control method and system based on dual-band OCT collaborative imaging. Employing a dual-band OCT collaborative scanning strategy, during near-infrared preview, a built-in fixation target assists the patient's gaze, recording fixation target parameters. During visible light preview adjustment, a scanning target point is generated, and its position is adjusted using fixation target parameters, reducing the patient's exposure time in visible light, minimizing glare, and improving patient comfort. During the actual scanning phase, the scanning beam generates a dynamic scanning target point, periodically stopping at a fixed position to guide the patient's gaze, solving the problem of visible light obscuring the built-in target and effectively reducing eye movement artifacts.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a dynamic target control method and system based on dual-band OCT collaborative imaging. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Optical coherence tomography (OCT) is a high-sensitivity, high-resolution, non-invasive, and non-destructive real-time imaging technique based on the principle of low-coherence optical interference. This technique uses a near-infrared light source to illuminate biological tissue and detects the interference signal between the backscattered light and the reference light to achieve tomographic imaging of the optical properties of the tissue at different depths. Currently, OCT technology is widely used in clinical diagnostic fields such as ophthalmology, cardiovascular medicine, and dermatology. Visible light optical coherence tomography is the latest development branch of OCT technology, which can provide higher spatial resolution (down to the micrometer level), suitable for imaging fine surface structures, thereby obtaining more detailed tissue structure information.

[0004] The existing visible light OCT scheme has the following problems: (1) Visible light OCT uses the visible light band, and its beam is relatively bright. During the adjustment preview before formal image acquisition, the patient has to keep looking at it for a long time, which is not comfortable and can easily cause the patient to feel dizzy. This leads to an increase in the frequency of blinking or eye movement during the imaging process, which affects the stability and repeatability of data acquisition; (2) During the OCT imaging process, the high brightness of the visible light in visible light OCT may obscure the original fixation target of the device, making it difficult for the patient to accurately look at the target and unable to ensure the eye posture. At the same time, the unconscious movement of the eye with the scanning beam will introduce motion artifacts, causing image misalignment or local information loss, which in turn affects the accuracy of clinical diagnosis. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a dynamic target control method and system based on dual-band OCT collaborative imaging. It employs a dual-band OCT collaborative scanning strategy based on near-infrared and visible light. During near-infrared preview, a built-in fixation target assists the patient's gaze, and fixation target parameters are recorded. During visible light preview adjustment, a scanning target point is generated, and its position is adjusted using fixation target parameters, reducing the patient's exposure time under visible light, minimizing glare, and improving patient comfort. In the formal scanning phase, the scanning beam generates a dynamic scanning target point. After acquiring a segment, the beam jumps back to the dynamic scanning target point and periodically pauses at a fixed position to guide the patient's gaze. This solves the problem of visible light obscuring the built-in target and reduces eye movement artifacts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a dynamic target control method based on dual-band OCT collaborative imaging.

[0008] A dynamic target control method based on dual-band OCT collaborative imaging includes the following steps:

[0009] Turn on the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, and observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position.

[0010] Enable visible light preview mode. Generate an overlapping visible light scanning target point at the recorded fixed target position. Use multi-line scanning mode. The camera scans the preview at a set frequency. After completing one multi-line scan, jump to the position of the visible light scanning target point. The jump distance is a fixed value. After scanning the fixed trajectory for a set time, jump back to perform multi-line scanning. Repeat this process until the visible light preview adjustment is completed.

[0011] After completing the visible light preview adjustment, enter the formal acquisition mode and perform formal acquisition control.

[0012] In one implementation of the first aspect of the present invention, adjusting the sample arm to optimize the contrast of the interference signal and focusing includes:

[0013] The sample arm is equipped with a polarization controller and The system utilizes a polarization controller to optimize the contrast of the interference signal and adjust... The system's spacing is used for focusing.

[0014] In one implementation of the first aspect of the invention, the camera uses a set frequency. Scan preview, jump distance is Perform fixed trajectory scanning for a set time. The number of scan lines is When the constraint is satisfied: , For the sample arm The focal length of the focusing lens in the system, The maximum angular velocity of the galvanometer. This represents the number of sampling points in each consecutive scan.

[0015] In one implementation of the first aspect of the present invention, formal data acquisition control includes:

[0016] Continuous scanning One point;

[0017] Jump to the location of the visible light scanning target;

[0018] A fixed trajectory is scanned at the position of the target point using visible light.

[0019] Jump back to the previous page One point completes one cycle of scanning;

[0020] Then from the first The scan continues from one point to the next, repeating multiple cycles of scanning until the scan is complete.

[0021] As a further limitation of the first aspect of the invention, the camera uses a set frequency. Acquire signal images and scan to the 1st After the initial point, move to the position of the visible light scanning target point; at this point, the distance between the two points is... Duration of stay Then return to the first At each point, no trigger signal is sent to the camera during the process, and no image is captured;

[0022] From the Points with frequency Continue scanning, acquiring signal images, scanning to the... At point , at the , The point moves to the position of the scanning target point, at which point the distance between the two points is... Duration of stay Then return to the first At each point, no trigger signal is sent to the camera during the process, and no image is captured;

[0023] Repeat the above process until the scan is complete. There are several points where the maximum jump distance exists in this process. The corresponding maximum jump time Satisfying the constraints: .

[0024] As a further limitation of the first aspect of the present invention, the completion of the first... After acquiring data at each point, the sample arm is moved to the position of the visible light scanning target point. At this time, the sample arm... Scanning galvanometer and The scanning galvanometer control voltage is: ; ,in, Represents scan time. Representing the The redirect time required for each redirect. and Representative at the At the end of the scan segment, Scanning galvanometer and The termination voltage value of the scanning galvanometer. and represent exist and directional components, Represents from the scan point Distance to the visible light scanning target point , This represents the optical path length from the galvanometer to the scanning target. and Represent Scanning galvanometer and Sensitivity of the scanning galvanometer;

[0025] Return to the At each point, the voltage changes in the opposite direction.

[0026] In one implementation of the first aspect of the present invention, the optical path system for dual-band OCT collaborative imaging includes: a light source, a first dichroic mirror, a first filter, a second dichroic mirror, a second filter, a first wavelength division multiplexer, a second wavelength division multiplexer, an optical fiber coupler, a spectrometer, a reference arm, and a sample arm.

[0027] The first dichroic mirror is used to receive light emitted by the light source and reflect visible light. The first filter is used to receive visible light and transmit it to the first wavelength division multiplexer. A first shutter is arranged in the optical path between the first dichroic mirror and the first filter.

[0028] The second dichroic mirror is used to receive the light transmitted from the first dichroic mirror and reflect infrared light. The second filter is used to receive visible light and transmit it to the first wavelength division multiplexer. A second shutter is arranged in the optical path between the second dichroic mirror and the second filter.

[0029] The fiber optic coupler is connected to the first wavelength division multiplexer, the second wavelength division multiplexer, the reference arm, and the sample arm via optical fibers, respectively. The second wavelength division multiplexer is connected to the spectrometer.

[0030] When the second shutter opens and the first shutter closes, the near-infrared preview mode is activated; when the first shutter opens and the second shutter closes, the visible light preview mode is activated.

[0031] Secondly, the present invention provides a dynamic target control system based on dual-band OCT collaborative imaging.

[0032] A dynamic target control system based on dual-band OCT collaborative imaging includes:

[0033] The near-infrared preview control unit is configured to: enable the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position.

[0034] The visible light preview control unit is configured to: enable the visible light preview mode, generate an overlapping visible light scanning target point at the recorded fixed target position, use multi-line scanning mode, scan the preview at a set frequency, after completing one multi-line scan, jump to the position of the visible light scanning target point, the jump distance is a fixed value, perform fixed trajectory scanning for a set time, and then jump back to perform multi-line scanning, repeating this process until the visible light preview adjustment is completed;

[0035] The formal acquisition control unit is configured to enter the formal acquisition mode and perform formal acquisition control after completing the visible light preview adjustment.

[0036] Thirdly, the present invention provides a computer device, comprising: a processor and a computer-readable storage medium;

[0037] A processor, adapted to execute computer programs;

[0038] A computer-readable storage medium storing a computer program, which, when executed by the processor, implements the dynamic target control method based on dual-band OCT collaborative imaging as described in the first aspect of the present invention.

[0039] Fourthly, the present invention provides a computer-readable storage medium storing a computer program adapted to be loaded by a processor and executed as described in the first aspect of the present invention for dynamic target control based on dual-band OCT collaborative imaging.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] 1. This invention employs a dual-band collaborative scanning strategy. During near-infrared OCT preview, a fixation target assists the patient in completing initial positioning and recording the optimal position parameters of the fixation target. During visible light preview adjustment, a dynamic visible light scanning target is designed, and the scanning beam generates the scanning target. By rapidly positioning the target using the pre-recorded position parameters, the visible light scanning target and the fixation target are aligned, shortening the visible light preview adjustment time, reducing the patient's exposure time under visible light, reducing glare, and improving patient comfort.

[0042] 2. This invention uses a visible light beam to generate a visible light scanning target point instead of a fixed target, thus solving the problem of target occlusion. During the actual acquisition process, the visible light beam scans... After the initial scan, the system jumps to the target point generated by the visible light beam. The target point is temporarily paused to guide the patient's gaze, and then the system jumps back to the original position to continue the formal scanning and acquisition. This process is repeated until the image acquisition is completed, which solves the problem of visible light obscuring the built-in target and reduces eye movement artifacts.

[0043] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0044] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0045] Figure 1 A schematic diagram of a dual-band OCT collaborative imaging system provided as an exemplary embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a dynamic target control method provided as an exemplary embodiment of the present invention;

[0047] Figure 3 A schematic diagram of an image acquisition process provided as an exemplary embodiment of the present invention;

[0048] Figure 4 A schematic diagram of a dynamic target control system provided as an exemplary embodiment of the present invention;

[0049] Figure 5 A schematic diagram of a computer device provided as an exemplary embodiment of the present invention;

[0050] The components include: 1. Supercontinuum light source; 2. First dichroic mirror; 3. Second dichroic mirror; 4. First shutter; 5. Second shutter; 6. First reflecting mirror; 7. Third reflecting mirror; 8. Second reflecting mirror; 9. First filter; 10. Fourth reflecting mirror; 11. Second filter; 12. Laser collecting tube; 13. First wavelength division multiplexer; 14. Fiber optic coupler; 15. First collimator; 16. Dispersion compensation lens; 17. Attenuator; 18. Reflector; 19. Second collimator; 20. Scanning galvanometer; 21. Scanning galvanometer; 22. System; 23. Second Wavelength Division Multiplexer; 24. NIR Spectrometer; 25. VIS Spectrometer; 26. Processor. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0052] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0053] As described in the background section, visible light OCT uses the visible light band, and the bright beam can easily obscure the fixation target. Unconscious eye movements following the scanning beam introduce motion artifacts. Furthermore, prolonged viewing of strong visible light during preview adjustments to the fixation target position and the patient's eye posture can easily cause glare, leading to increased blinking and eye movement, thus affecting the stability and repeatability of data acquisition. Therefore, this implementation proposes a dual-band OCT collaborative imaging system, such as... Figure 1 As shown, it includes: a supercontinuum light source 1, a first dichroic mirror 2, a first filter 9, a second dichroic mirror 3, a second filter 11, a first wavelength division multiplexer 13, a second wavelength division multiplexer 23, an optical fiber coupler 14, a spectrometer (including an NIR spectrometer 24 and a VIS spectrometer 25), a reference arm, and a sample arm.

[0054] The first dichroic mirror 2 is used to receive light emitted by the supercontinuum light source 1 and reflect visible light. The first filter 9 is used to receive visible light and transmit it to the first wavelength division multiplexer 13. A first shutter 4 is arranged in the optical path between the first dichroic mirror 2 and the first filter 9.

[0055] The second dichroic mirror 3 is used to receive the light transmitted from the first dichroic mirror 2 and reflect infrared light. The second filter 11 is used to receive visible light and transmit it to the first wavelength division multiplexer 13. A second shutter 5 is arranged in the optical path between the second dichroic mirror 3 and the second filter 11. The light transmitted by the second dichroic mirror 3 is collected by the laser collecting tube 12.

[0056] In this implementation, optionally, the fiber optic coupler 14 is connected to the first wavelength division multiplexer 13, the second wavelength division multiplexer 23, the reference arm, and the sample arm via optical fibers, and the second wavelength division multiplexer 23 is connected to the spectrometer via optical fibers.

[0057] In this implementation, optionally, the first filter 9 is connected to the first port of the first wavelength division multiplexer 13 via an optical fiber, the second filter 11 is connected to the second port of the first wavelength division multiplexer 13 via an optical fiber, the third port of the first wavelength division multiplexer 13 is connected to the first port of the fiber optic coupler 14 via an optical fiber, the second port of the fiber optic coupler 14 is connected to the first port of the second wavelength division multiplexer 23 via an optical fiber, the second port of the second wavelength division multiplexer 23 is connected to the NIR spectrometer 24 via an optical fiber, the third port of the second wavelength division multiplexer 23 is connected to the VIS spectrometer 25 via an optical fiber, and the NIR spectrometer 24 and the VIS spectrometer 25 are electrically connected to the processor 26.

[0058] In this implementation, preferably, a first reflector 6 and a second reflector 8 are arranged in the optical path between the first shutter 4 and the first filter 9. Visible light passing through the first shutter 4 reaches the first filter 9 after being reflected twice by the first reflector 6 and the second reflector 8.

[0059] In this implementation, preferably, a third reflector 7 and a fourth reflector 10 are arranged in the optical path between the second shutter 5 and the second filter 11. Visible light passing through the first shutter 4 reaches the second filter 11 after being reflected twice by the third reflector 7 and the fourth reflector 10.

[0060] In this preferred embodiment, the reference arm includes a first collimator 15, a dispersion compensation lens 16, an attenuator 17, and a fifth reflecting mirror 18 arranged sequentially along the optical path, while the sample arm includes a polarization controller and a second collimator 19 arranged sequentially along the optical path. Scanning galvanometer 20 Scanning galvanometer 21 and System 22.

[0061] The working principle of the above dual-band OCT collaborative imaging system is as follows:

[0062] Visible light is separated from the supercontinuum light source 1 by the first dichroic mirror 2. The light transmitted from the first dichroic mirror 2 to the second dichroic mirror 3 is then separated into infrared light by the second dichroic mirror 3. The switching between visible light and infrared light is controlled by the first shutter 4 and the second shutter 5.

[0063] Visible light and infrared light are filtered by the first filter 9 and the second filter 11 respectively and then coupled into the optical fiber. The first wavelength division multiplexer 13 then introduces the visible light and infrared light into the optical fiber coupler 14. The light is split into two parts by the optical fiber coupler 14 according to a certain splitting ratio, one part goes to the reference arm and the other part goes to the sample arm.

[0064] In the reference arm, the parallel light is first output through the first collimator 15, then passes through the dispersion compensation lens 16 and the attenuator 17, and is incident on the fifth reflector 18, and is reflected back into the fiber coupler 14 by the reflector.

[0065] In the sample arm, parallel light is output after passing through the second collimator 19, and then... Scanning galvanometer 20 and The scanning galvanometer 21 controls the scanning trajectory of the beam, after... The system 22 focuses the light onto the human eye's retina and then returns it to the fiber coupler 14. The light signals returned by the reference arm and the sample arm generate interference signals in the fiber coupler 14. The interference signals are transmitted to the NIR spectrometer 24 and the VIS spectrometer 25 via the second wavelength division multiplexer 23. The NIR spectrometer 24 and the VIS spectrometer 25 convert the light signals into electrical signals and then transmit the data to the processor 26 for processing.

[0066] Figure 2 A dynamic target control method is shown, comprising the following steps:

[0067] Infrared OCT and fixation target-assisted retinal pre-positioning were performed. The near-infrared OCT imaging system was activated for real-time preview scanning in high-speed single-line scanning mode. The fixation target was activated, and its position was adjusted by observing characteristic fundus structures in the real-time OCT images through target guidance and real-time preview image feedback. The contrast of the interference signal was optimized using a polarization controller, and adjustments were made accordingly. The system focuses at 22 intervals, during which the patient maintains fixation on the moving target pattern, and the fixation target position parameters are recorded.

[0068] After the infrared OCT preview adjustment is completed, the visible light preview mode is activated for image fine-tuning. Because the high brightness of the visible light scanning beam will obscure the original fixed target, the system generates a new visible light scanning target point at the original fixed target location while maintaining the visible light OCT scan. The visible light OCT preview scan uses a multi-line scanning protocol, with the camera operating at a certain frequency. Scan preview, visible light beam uses Line scan mode (usually) =3 or 4); after completing one multi-line scan, jump to the pre-adjusted position of the visible light scanning target point, the jump distance is... Perform fixed trajectory scanning, target scanning time is Then jump back to perform multi-line scanning, repeating this process until the visible light preview adjustment is complete. The entire process must meet the following constraints:

[0069] (1);

[0070] in, This represents one multi-line scan preview adjustment cycle. For the sample arm The focal length of the focusing lens in system 22, for Scanning galvanometer 20 and The maximum angular velocity of the scanning galvanometer 21, under short-distance jump conditions. Scanning galvanometer 20 and The motion of the scanning galvanometer 21 starts from rest with maximum angular acceleration. accelerate.

[0071] In this implementation, the movie uses a frame rate of 24 frames per second to provide smooth visual effects and appropriate playback speed. Therefore, the standard frame rate here is 24. Of course, the standard frame rate here can also be selected according to different applicable scenarios, which will not be elaborated here.

[0072] In this implementation, visible light scanning of the target point guides the patient's gaze, real-time image analysis calibrates the eye position, a polarization controller optimizes the contrast of the interference signal, and adjusts... The system uses a 22-spacing focus to complete visible light preview adjustment. The visible light scanning target point replaces the original fixation target function, ensuring both image quality and patient comfort.

[0073] During the actual visible light image acquisition, the light beam scans point by point in a segmented scanning manner. After acquiring a fixed number of points, it jumps to the visible light scanning target point (fixed position). Then, based on the visible light scanning target point, it scans along a certain trajectory to keep the patient's gaze stable. Then, it returns to the end point of the previous segment of the actual acquisition and continues scanning a fixed number of points. This process is repeated until the image acquisition is completed. The overall process is as follows:

[0074] (1) Scanning phase (e.g., from 0 to the first) (points): continuous scanning via two galvanometers. One point;

[0075] (2) Visible light scanning target jump stage: jump quickly to the visible light scanning target (fixed position) in a straight line (or a broken line or a curve, which will not be described in detail here);

[0076] (3) Visible light scanning target scanning stage: Scan a fixed trajectory at a fixed position of the visible light scanning target;

[0077] (4) Visible light scanning target return stage: rapid linear jump back to the first... Each point (you can also jump using a polyline or a curve, which will not be detailed here);

[0078] This completes one cycle of scanning. Then, starting from the... Continue scanning from one point to the next, repeating this cycle until the scan is complete.

[0079] More specifically, after optimizing the quality of the visible light OCT preview images, the system switches to the formal acquisition mode. In this mode, the system acquires fine structural images of each layer of the retina according to a preset scanning protocol. During the formal acquisition process, the system generates dynamic visible light scanning targets to ensure that the patient can maintain a stable gaze, such as... Figure 3 As shown, the specific implementation method is as follows: the camera operates at a certain frequency. Acquire signal images, scan The first point. Scan to the first... After the initial point, move to the position of the visible light scanning target (at this point, the distance between the two points is...). ), stay time Then return to the first At point 1, no trigger signal is sent to the camera during this process, and no image is captured. From point 2... The point is scanned at a frequency f, and the signal image is acquired. The scan continues until the point... The point; at the point The point is moved to the position of the visible light scanning target point (at this time, the distance between the two points is...). ), stay time Then return to the first At each point, no trigger signal is sent to the camera, and no image is acquired during this process. This process is repeated until the scan is complete. The distance at which the target point is jumped during the process is [number] points. If not fixed, there is a maximum jump distance. Therefore, the jump time required each time It is not fixed, so the corresponding maximum jump time is... To ensure visual comfort and image quality, the following constraints must be met:

[0080] (2)

[0081] conduct Scanning galvanometer 20 and The scanning galvanometer 21 is voltage controlled to complete the first step. After data collection at each point, the image is moved to the visible light scanning target point (time). ):

[0082] (3);

[0083] (4);

[0084] Return to the At each point, the voltage changes in the opposite direction;

[0085] in, Represents the number of samples in each consecutive scan. The data collection time for each point; This represents the dwell time at the scanned target. This represents the number of sampling points in each consecutive scan; Represents the sequence number of the scan segment, i.e., the... Segment scan, for example, ; and Representative at the At the end of the scan segment, Scanning galvanometer 20 and The termination voltage value of the scanning galvanometer 21, Represents from the scan point Distance to the visible light scanning target point and yes exist direction and The directional component, i.e. ; represent The maximum jump time corresponding to the time; Represents the completion of the first The time it takes to move from the point of data acquisition to the target point for scanning; This represents the optical path length from the galvanometer to the scanning target point; and Represent Scanning galvanometer 20 and The sensitivity of the scanning galvanometer 21, i.e. , ; This represents the time elapsed in the current scanning phase (e.g., before completion). (The cumulative time of scanning each point), where τ represents the time variable during the jump process. represent The voltage of the scanning galvanometer 20, represent The voltage of the scanning galvanometer 21, represent The deflection angle of the scanning galvanometer 20 represent The deflection angle of the scanning galvanometer 21.

[0086] In summary, this invention achieves both deep infrared detection and micron-level high resolution visible light in a single imaging process through dual-band collaborative scanning. During preview, infrared OCT is activated, and a built-in fixation target assists the patient's gaze, recording the target parameters. During visible light preview adjustment, a visible light scanning target point is generated, and its position is adjusted using the fixation target parameters, reducing the patient's exposure time to visible light, minimizing glare, and improving patient comfort. In the formal scanning phase, the scanning beam generates a dynamic scanning target point that periodically stays at a fixed position to guide the patient's gaze, solving the problem of visible light obscuring the built-in target and reducing eye movement artifacts.

[0087] Figure 4 A dynamic target control system is shown, utilizing the aforementioned dual-band OCT collaborative imaging system, comprising:

[0088] The near-infrared preview control unit 401 is configured to: open the second shutter and close the first shutter, activate the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, observe the fundus characteristic structures in the real-time OCT image to adjust the fixation target position through fixation target guidance and real-time preview image feedback, adjust the sample arm to optimize the contrast of the interference signal and focus, and record the fixation target position.

[0089] The visible light preview control unit 402 is configured to: open the first shutter and close the second shutter, activate the visible light preview mode, generate an overlapping visible light scanning target point at the recorded fixed target position, use a multi-line scanning method, the camera scans the preview at a set frequency, after completing one multi-line scan, jump to the position of the visible light scanning target point, the jump distance is a fixed value, perform a fixed trajectory scan for a set time, and then jump back to perform multi-line scan, repeating this process until the visible light preview adjustment is completed;

[0090] The formal acquisition control unit 403 is configured to enter the formal acquisition mode and perform formal acquisition control after completing the visible light preview adjustment.

[0091] It is understood that the aforementioned units can be individually or entirely merged into one or more other units, or some of the units can be further divided into multiple functionally smaller units. This achieves the same operation without affecting the technical effects of the embodiments of the present invention. The aforementioned units are based on logical functional division. In practical applications, the function of one unit can be implemented by multiple units, or the function of multiple units can be implemented by one unit. In other embodiments of the present invention, the system may also include other units. In practical applications, these functions can also be implemented with the assistance of other units, and can be implemented collaboratively by multiple units.

[0092] According to another embodiment of the present invention, the system described in this embodiment can be constructed by running a computer program (including program code) capable of performing the steps involved in the corresponding method of the present invention on a general-purpose computing device, such as a computer, which includes processing elements and storage elements such as a central processing unit (CPU), random access memory (RAM), and read-only memory (ROM). The computer program can be recorded on, for example, a computer-readable recording medium, loaded into the aforementioned computing device through the computer-readable recording medium, and run therein.

[0093] Figure 5 A computer device is shown, which includes a processor, a communication interface, and a computer-readable storage medium. The processor, communication interface, and computer-readable storage medium are connected via a bus or other means.

[0094] The communication interface is used to receive and send data. The computer-readable storage medium can be stored in the memory of the electronic device. The computer-readable storage medium is used to store computer programs, which include program instructions. The processor is used to execute the program instructions stored in the computer-readable storage medium.

[0095] A processor is the computing and control core of an electronic device. It is suitable for implementing one or more instructions, specifically for loading and executing one or more instructions to achieve the corresponding method flow or function.

[0096] The processor is configured to perform the following process:

[0097] Turn on the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, and observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position.

[0098] Enable visible light preview mode. Generate an overlapping visible light scanning target point at the recorded fixed target position. Use multi-line scanning mode. The camera scans the preview at a set frequency. After completing one multi-line scan, jump to the position of the visible light scanning target point. The jump distance is a fixed value. After scanning the fixed trajectory for a set time, jump back to perform multi-line scanning. Repeat this process until the visible light preview adjustment is completed.

[0099] After completing the visible light preview adjustment, enter the formal acquisition mode and perform formal acquisition control.

[0100] This invention also provides a computer-readable storage medium, which is a memory device in an electronic device for storing programs and data. It is understood that the computer-readable storage medium here may include both built-in storage media in the electronic device and extended storage media supported by the electronic device. The computer-readable storage medium provides storage space for storing the processing system of the electronic device.

[0101] Furthermore, this storage space also contains one or more instructions suitable for loading and execution by the processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM memory or unstable memory, such as at least one disk storage device; optionally, it can also be at least one computer-readable storage medium located remotely from the aforementioned processor.

[0102] In one embodiment, the computer-readable storage medium stores one or more instructions; the processor loads and executes the one or more instructions stored in the computer-readable storage medium to perform the following process:

[0103] Turn on the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, and observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position.

[0104] Enable visible light preview mode. Generate an overlapping visible light scanning target point at the recorded fixed target position. Use multi-line scanning mode. The camera scans the preview at a set frequency. After completing one multi-line scan, jump to the position of the visible light scanning target point. The jump distance is a fixed value. After scanning the fixed trajectory for a set time, jump back to perform multi-line scanning. Repeat this process until the visible light preview adjustment is completed.

[0105] After completing the visible light preview adjustment, enter the formal acquisition mode and perform formal acquisition control.

[0106] The present invention also provides a computer program product or computer program comprising computer instructions stored in a computer-readable storage medium. A processor of an electronic device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the electronic device to perform the following process:

[0107] Turn on the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, and observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position.

[0108] Enable visible light preview mode. Generate an overlapping visible light scanning target point at the recorded fixed target position. Use multi-line scanning mode. The camera scans the preview at a set frequency. After completing one multi-line scan, jump to the position of the visible light scanning target point. The jump distance is a fixed value. After scanning the fixed trajectory for a set time, jump back to perform multi-line scanning. Repeat this process until the visible light preview adjustment is completed.

[0109] After completing the visible light preview adjustment, enter the formal acquisition mode and perform formal acquisition control.

[0110] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can implement the described functions using different methods for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0111] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of the present invention is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic cable, digital cable) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that a computer can access or a data processing device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state drive), etc.

[0112] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dynamic target control method based on dual-band OCT collaborative imaging, characterized in that, Includes the following processes: Turn on the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, and observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position. Enable visible light preview mode. Generate an overlapping visible light scanning target point at the recorded fixed target position. Use multi-line scanning mode. The camera scans the preview at a set frequency. After completing one multi-line scan, jump to the position of the visible light scanning target point. The jump distance is a fixed value. After scanning the fixed trajectory for a set time, jump back to perform multi-line scanning. Repeat this process until the visible light preview adjustment is completed. After completing the visible light preview adjustment, enter the formal acquisition mode and perform formal acquisition control.

2. The dynamic target control method based on dual-band OCT collaborative imaging as described in claim 1, characterized in that, The sample arm is adjusted to optimize the contrast of the interference signal and to focus, including: The sample arm is equipped with a polarization controller and The system utilizes a polarization controller to optimize the contrast of the interference signal and adjusts the spacing of the 4F system for focusing.

3. The dynamic target control method based on dual-band OCT collaborative imaging as described in claim 1, characterized in that, Camera set frequency Scan preview, jump distance is Perform fixed trajectory scanning for a set time. The number of scan lines is When the constraint is satisfied: , For the sample arm The focal length of the focusing lens in the system, The maximum angular velocity of the galvanometer. This represents the number of sampling points in each consecutive scan.

4. The dynamic target control method based on dual-band OCT collaborative imaging as described in claim 1, characterized in that, Formal data collection and control will be implemented, including: Continuous scanning One point; Jump to the location of the visible light scanning target; A fixed trajectory is scanned at the position of the target point using visible light. Jump back to the previous page One point completes one cycle of scanning; Then from the first The scan continues from one point to the next, repeating multiple cycles of scanning until the scan is complete.

5. The dynamic target control method based on dual-band OCT collaborative imaging as described in claim 4, characterized in that, Camera set frequency Acquire signal images and scan to the first... After the initial point, move to the position of the visible light scanning target point; at this point, the distance between the two points is... Duration of stay Then return to the first At each point, no trigger signal is sent to the camera during the process, and no image is captured; From the Points with frequency Continue scanning, acquiring signal images, scanning to the... At point , at the , The point moves to the position of the scanning target point, at which point the distance between the two points is... Duration of stay Then return to the first At each point, no trigger signal is sent to the camera during the process, and no image is captured; Repeat the above process until the scan is complete. There are several points where the maximum jump distance exists in this process. The corresponding maximum jump time The constraints are satisfied: .

6. The dynamic target control method based on dual-band OCT collaborative imaging as described in claim 5, characterized in that, Complete the first After acquiring data at each point, the sample arm is moved to the position of the visible light scanning target point. At this time, the sample arm... Scanning galvanometer and The scanning galvanometer control voltage is: ; ,in, Represents scan time. Representing the The redirect time required for each redirect. and Representative at the At the end of the scan segment, Scanning galvanometer and The termination voltage value of the scanning galvanometer. and represent exist and directional components, Represents from the scan point Distance to the visible light scanning target point , This represents the optical path length from the galvanometer to the scanning target. and Represent Scanning galvanometer and Sensitivity of the scanning galvanometer; Return to the At each point, the voltage changes in the opposite direction.

7. The dynamic target control method based on dual-band OCT collaborative imaging as described in any one of claims 1-6, characterized in that, The optical path system for dual-band OCT collaborative imaging includes: a light source, a first dichroic mirror, a first filter, a second dichroic mirror, a second filter, a first wavelength division multiplexer, a second wavelength division multiplexer, an optical fiber coupler, a spectrometer, a reference arm, and a sample arm; The first dichroic mirror is used to receive light emitted by the light source and reflect visible light. The first filter is used to receive visible light and transmit it to the first wavelength division multiplexer. A first shutter is arranged in the optical path between the first dichroic mirror and the first filter. The second dichroic mirror is used to receive the light transmitted from the first dichroic mirror and reflect infrared light. The second filter is used to receive visible light and transmit it to the first wavelength division multiplexer. A second shutter is arranged in the optical path between the second dichroic mirror and the second filter. The fiber optic coupler is connected to the first wavelength division multiplexer, the second wavelength division multiplexer, the reference arm, and the sample arm via optical fibers, respectively. The second wavelength division multiplexer is connected to the spectrometer. When the second shutter opens and the first shutter closes, the near-infrared preview mode is activated; when the first shutter opens and the second shutter closes, the visible light preview mode is activated.

8. A dynamic target control system based on dual-band OCT collaborative imaging, characterized in that, include: The near-infrared preview control unit is configured to: enable the near-infrared preview mode, perform real-time preview scanning, activate the fixation target, observe the fundus characteristic structures in the real-time OCT image through fixation target guidance and real-time preview image feedback to adjust the fixation target position, adjust the sample arm to optimize the interference signal contrast and focus, and record the fixation target position. The visible light preview control unit is configured to: enable the visible light preview mode, generate an overlapping visible light scanning target point at the recorded fixed target position, use multi-line scanning mode, scan the preview at a set frequency, after completing one multi-line scan, jump to the position of the visible light scanning target point, the jump distance is a fixed value, perform fixed trajectory scanning for a set time, and then jump back to perform multi-line scanning, repeating this process until the visible light preview adjustment is completed; The formal acquisition control unit is configured to enter the formal acquisition mode and perform formal acquisition control after completing the visible light preview adjustment.

9. A computer device, characterized in that, include: Processor and computer-readable storage media; A processor, adapted to execute computer programs; A computer-readable storage medium storing a computer program, which, when executed by the processor, implements the dynamic target control method based on dual-band OCT collaborative imaging as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program adapted to be loaded by a processor and executed as described in any one of claims 1 to 7, which is a dynamic target control method based on dual-band OCT collaborative imaging.

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