Spectral reflectance test methods, OCT systems, media, products and equipment

Abstract

The present invention belongs to the technical field of spectral reflectance testing. A spectral reflectance testing method, OCT system, medium, product and equipment are proposed. For any wavelength, multiple spectral acquisitions of the target area are performed to obtain multiple cross-correlated interference signals corresponding to the wavelength, and each of the cross-correlated interference signals is processed to form a combined signal; the constant coefficients and trigonometric function coefficients of the combined signal are obtained, and the reflectance corresponding to the wavelength is obtained according to the ratio of the combined signal to . The present invention only uses the signal of the target area, and the image used when segmenting the target area is the image with the highest resolution collected, so the segmentation accuracy can reach the highest, and the spectral resolution obtained by inverse Fourier transform is consistent with the spectral resolution of the original acquisition, which will not lead to a decrease in spectral resolution, and a more accurate spectral reflectance can be obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of spectral reflectance testing, and in particular to a spectral reflectance testing method, an OCT system, a medium, a product and a device. Background Art

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

[0003] Spectral reflectivity refers to the ratio of the intensity of reflected light to the intensity of incident light after light hits an object. It is usually used to describe the reflective properties of an object and is a function that varies with wavelength. When a light source hits an object, the object will selectively reflect electromagnetic waves of different wavelengths. This reflective ability is closely related to the material, color and other properties of the object. In OCT, spectral reflectivity mainly refers to the reflective ability of different layers or types of tissues in the tissue to light, which is closely related to the optical properties of the tissue. As the most important photosensitive tissue in the eye, the health of the retina directly affects the visual function. The blood oxygen saturation of the retina is an important indicator for evaluating the metabolism and blood supply of the retina, and is usually calculated with the help of the spectral reflectivity of the blood. In the existing OCT method for measuring blood oxygen saturation, the spectral reflectivity of the lower wall of the retinal blood vessels is usually measured first, and then the blood oxygen saturation is calculated by the least squares method. In addition, different layers of the retina have different sensitivities to different wavelengths of light, which usually also implies some disease information. For example, the spectral reflectivity of the optic nerve fiber layer changes with the development of glaucoma.

[0004] The traditional spectral reflectance test method is usually called the windowing method or short-time Fourier transform method. This method applies a Gaussian window to different bands of the original data to obtain spectral data containing only part of the band. Subsequently, the spectral data of each group of partial bands are used to reconstruct the image, calculate the signal intensity of the target area, and obtain the spectral reflectance in each band through normalization and other processing. Finally, a continuous spectral reflectance is obtained through interpolation or fitting. However, the traditional method has the following problems: (1) Introduction of irrelevant signals: Windowing will reduce the band range, resulting in a decrease in the axial resolution of the image data obtained by image reconstruction. Therefore, the signal in the target area may be mixed with the signal in the surrounding area, and irrelevant signals will be introduced in the segmentation process of the target area; (2) Poor spectral resolution: The spectral information of an entire band is used in the image reconstruction process, and the obtained spectral reflectance is the weighted result within the entire band range, which is difficult to accurately reflect the true reflectance at a single wavelength; (3) High computational complexity: After each windowing, the operation from spectral signal to image needs to be performed again, which increases the computational complexity and time cost. Summary of the invention

[0005] In order to address the deficiencies of the prior art, the present invention provides a spectral reflectance test method, system, medium, software product and device. When segmenting the target area, the resolution of the segmented data of the present invention is consistent with the highest resolution that the collected original data can achieve. In addition, the spectral resolution obtained by the inverse Fourier transform is consistent with the spectral resolution of the original collection, and will not lead to a decrease in the spectral resolution; in addition, the number of Fourier transforms and inverse Fourier transforms required by the present invention depends on the number of times required to eliminate the phase of the trigonometric function, which is usually only a dozen times, while the windowing rule usually requires hundreds of Fourier transform operations to ensure the number of effective spectral reflectances.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a spectral reflectance testing method.

[0008] A spectral reflectance testing method includes the following steps:

[0009] For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal formed by processing each of the cross-correlated interference signals;

[0010] Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of is the reflectivity corresponding to the wavelength.

[0011] As a further limitation of the first aspect of the present invention, the maximum number of times the spectrum is collected is The optical path difference changes with each spectrum acquisition The ratio is rounded off.

[0012] As a further limitation of the first aspect of the present invention, the constant coefficient of the combined signal It is the product of: the conversion coefficient of light intensity to electrical signal in the spectrometer, the transmittance of the entire optical path from the light source to the sample arm reflector, the transmittance of the light reflected from the reference arm to the spectrometer, the transmittance of the entire optical path from the light source to the reference arm sample, the transmittance of the light reflected from the sample arm to the spectrometer, and the reflectance of the reference arm reflector.

[0013] As a further limitation of the first aspect of the present invention, processing each of the cross-correlated interference signals comprises:

[0014] Will domain signal After linearization, it is converted to domain signal, ,exist After Fourier transform in the domain, segmentation of the target layer, inverse Fourier transform and λ domain linearization, the processed cross-correlation interference signal is obtained. .

[0015] As a further limitation of the first aspect of the present invention, the combined signal is:

[0016] ;

[0017] Reflectivity of different layers of sample tissue when the interlayer material is the same tissue Equal to the same reflectivity , according to the trigonometric function addition formula, and Equivalently, taking the absolute value we get:

[0018] ;

[0019] in, is the phase obtained by summing the trigonometric functions, is the number of spectrum acquisitions, is the number of discrete frequencies contained in the target layer, is the starting position of the target layer, is the reflectivity of different layers of the sample tissue, The distance difference between the light separated by the coupler and the object measured by the reference arm reflector and the sample arm is called the optical path difference. The optical path difference is changed for each spectral acquisition.

[0020] As a further limitation of the first aspect of the present invention, the interlayer reflectivity of the target area is for:

[0021] ;

[0022] in, represent The value after rounding.

[0023] In a second aspect, the present invention provides an OCT system for spectral reflectance testing.

[0024] An OCT system for spectral reflectance testing includes: a light source, a coupler, a first collimator, a reflector, a piezoelectric displacement platform, a second collimator, a scanning galvanometer, system, human eye, spectrometer and processing terminal, the first collimator and reflector constitute the reference arm, the second collimator, scanning galvanometer and The system constitutes a sample arm;

[0025] The light source is connected to the coupler via an optical fiber, the coupler is respectively connected to the first collimator and the second collimator via an optical fiber, the first collimator is opposite to the reflector, and the reflector is arranged on the piezoelectric displacement platform, and the reflector can be driven by the piezoelectric displacement platform to approach or move away from the first collimator;

[0026] The second collimator, the scanning galvanometer, the The system is arranged in sequence along the optical path, and the human eye is The second focusing lens of the system is positioned oppositely, the coupler is connected to the spectrometer, the spectrometer is connected to the processing terminal, and the processing terminal is configured to execute the spectral reflectance testing method described in the first aspect of the present invention.

[0027] In a third aspect, the present invention provides a computer device, comprising: a processor and a computer-readable storage medium;

[0028] a processor adapted to execute a computer program;

[0029] A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the spectral reflectance testing method as described in the first aspect of the present invention is implemented.

[0030] In a fourth aspect, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program is suitable for being loaded by a processor and executing the spectral reflectance testing method as described in the first aspect of the present invention.

[0031] In a fifth aspect, the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the spectral reflectance testing method as described in the first aspect of the present invention.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention innovatively proposes a spectral reflectance test strategy, which collects the spectrum of the target area multiple times to obtain multiple cross-correlated interference signals corresponding to the wavelength. , processing each of the cross-correlated interference signals to form a combined signal, and obtaining the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The reflectivity corresponding to the wavelength is obtained by the ratio of the values ​​of the wavelengths, and only the signal of the target area is used. The image used to segment the target area is the image with the highest resolution collected. Therefore, the accuracy of segmentation can be maximized, thereby ensuring the accuracy of reflectivity calculation.

[0034] 2. The present invention innovatively proposes a spectral reflectance test strategy. domain signal After linearization, it is converted to domain signal, ,exist After Fourier transform in the domain, segmentation of the target layer, inverse Fourier transform and λ domain linearization, the processed cross-correlation interference signal is obtained. The spectral resolution obtained by inverse Fourier transform is consistent with the spectral resolution of the original acquisition, which will not lead to a decrease in spectral resolution and can obtain a more accurate spectral reflectance.

[0035] 3. Windowing rule In order to ensure the number of effective spectral reflectances, it is usually necessary to perform hundreds of Fourier transform operations. The number of Fourier transforms and inverse Fourier transforms required by the present invention depends on the number of times required to eliminate the phase of the trigonometric function, which is usually only a dozen times, effectively reducing the complexity of the operation.

[0036] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0038] Figure 1 A schematic diagram of a process for measuring spectral reflectance provided in Example 1 of the present invention;

[0039] Figure 2 A schematic diagram of an OCT system for spectral reflectance testing provided in Example 2 of the present invention;

[0040] Figure 3 A schematic diagram of a computer device provided in Embodiment 3 of the present invention;

[0041] Among them, 1. light source; 2. coupler; 3. first collimator; 4. reflector; 5. piezoelectric displacement platform; 6. second collimator; 7. scanning galvanometer; 8. system; 9. human eye; 10. spectrometer; 11. processing terminal. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0044] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0045] Embodiment 1:

[0046] This implementation proposes a spectral reflectance test method using Figure 2 The OCT system for spectral reflectance testing is implemented, comprising: a light source 1, a coupler 2, a first collimator 3, a reflector 4, a piezoelectric displacement platform 5, a second collimator 6, a scanning galvanometer 7, system 8, human eye 9, spectrometer 10 and processing terminal 11, wherein the first collimator 3 and the reflector 4 constitute a reference arm, the second collimator 6, the scanning galvanometer 7 and The system 8 constitutes a sample arm, the light source 1 is connected to the coupler 2 through an optical fiber, the coupler 2 is respectively connected to the first collimator 3 and the second collimator 6 through an optical fiber, the first collimator 3 and the reflector 4 are opposite to each other, and the reflector 4 is arranged on the piezoelectric displacement platform 5, and the reflector 4 can approach or move away from the first collimator 3 under the drive of the piezoelectric displacement platform 5, the second collimator 6, the scanning galvanometer 7, and the 4f system 8 (including the first focusing lens and the second focusing lens) are arranged in sequence along the optical path, the human eye is opposite to the second focusing lens, the coupler 2 is connected to the spectrometer 10, and the spectrometer 10 is connected to the processing terminal 11.

[0047] The spectral reflectance testing method includes the following steps:

[0048] For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal formed by processing each of the cross-correlated interference signals;

[0049] Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of is the reflectivity corresponding to the wavelength.

[0050] More specifically, the following are included:

[0051] Get the spectral signal:

[0052] (1);

[0053] Where λ is the wavelength, is the signal collected by the spectrometer camera, is the DC component, is the cross-correlation component, is the autocorrelation component of the sample arm, where the DC component The autocorrelation component can be removed by subtracting the original signal of the reference arm. Since its signal strength is too small, it can be ignored.

[0054] One expression for the cross-correlation components is as follows:

[0055] (2);

[0056] in, is the conversion coefficient from light intensity to electrical signal in the spectrometer, is the transmittance of the entire optical path from the light source 1 to the sample arm reflector 4, is the transmittance of the light reflected from the reference arm to the entire optical path of the spectrometer, is the transmittance of the entire optical path from the light source 1 to the reference arm sample, is the transmittance of the entire optical path of the light reflected by the sample arm to the spectrometer, is the reflectivity of the reference arm reflector 4, is the reflectivity of different layers of the sample tissue, The distance difference between the light separated by the coupler and the object measured by the reference arm reflector and the sample arm is called the optical path difference. is the number of effective frequencies of the Fourier transform.

[0057] Formula (2) expresses the cross-correlation interference signal collected by the spectrometer. The only unknown part of this signal is the reflectivity of different layers of the sample tissue. Formula (2) can be simplified as:

[0058] (3);

[0059] Will Signal conversion to domain signal, ,exist The target layer is segmented, inverse Fourier transformed, Domain linearization, to regain the specific layer The final signal can be expressed as:

[0060] (4);

[0061] in, is the starting position of the target layer, The number of discrete frequencies contained in the target layer.

[0062] The reference arm position is quantitatively changed (by the piezoelectric displacement platform 5 driving the reflector 4 to move) and multiple acquisitions and data processing are performed. The multiple sets of data obtained can be expressed as:

[0063] (5);

[0064] in, is the number of spectrum acquisitions, The optical path difference that is changed for each spectrum acquisition is known to have an accuracy of up to 0.2 nm for the piezoelectric displacement platform.

[0065] The interlayer materials are usually of the same tissue and have similar optical properties. In It can be considered that in different Same below.

[0066] According to the trigonometric function addition formula, Equivalent to , take the absolute value, and we get:

[0067] (6);

[0068] Among them, A(λ) is the coefficient obtained by adding the trigonometric functions, and φλ is the phase obtained by adding the trigonometric functions.

[0069] In formula (6), for the trigonometric function ,when , the function has just changed a complete cycle, and its integral over one cycle is equal to 2, including discrete data, so for each Just use indivual( Representatives Take the rounded result) data and process it to get:

[0070] (7);

[0071] The interlayer reflectivity of the target area can be obtained:

[0072] (8).

[0073] like Figure 1 As shown in the figure, a specific calculation process is given. First, set , and collect the first data, so that ;judge Is not equal to If so, proceed Domain linearization, Fourier transform, segmentation of target area, inverse Fourier transform, The domain is linearized, and then the summed trigonometric function coefficients are calculated based on the segmentation position. Multiple groups of signals are superimposed to calculate the interlayer reflectivity. If not, the reference arm is moved to continue the next acquisition.

[0074] Embodiment 2:

[0075] like Figure 2 As shown, this implementation provides an OCT system for the spectral reflectance test described in Example 1, including: a light source 1, a coupler 2, a first collimator 3, a reflector 4, a piezoelectric displacement platform 5, a second collimator 6, a scanning galvanometer 7, system 8, human eye 9, spectrometer 10 and processing terminal 11, wherein the first collimator 3 and the reflector 4 constitute a reference arm, the second collimator 6, the scanning galvanometer 7 and System 8 constitutes the sample arm.

[0076] The light source 1 is connected to the coupler 2 through an optical fiber, and the coupler 2 is connected to the first collimator 3 and the second collimator 6 through optical fibers respectively. The first collimator 3 is opposite to the reflector 4, and the reflector 4 is arranged on the piezoelectric displacement platform 5. The reflector 4 can be driven by the piezoelectric displacement platform 5 to move closer to or away from the first collimator 3.

[0077] The second collimator 6, the scanning galvanometer 7, System 8 (including a first focusing lens and a second focusing lens) is arranged in sequence along the optical path, the human eye is opposite to the second focusing lens, the coupler 2 is connected to the spectrometer 10, the spectrometer 10 is connected to the processing terminal 11, and the processing terminal 11 is configured to execute the spectral reflectance test method described in Example 1.

[0078] Embodiment 3:

[0079] like Figure 3 As shown, this implementation provides an electronic device, which includes a processor 1001, a communication interface 1002, and a computer-readable storage medium 1003. The processor 1001, the communication interface 1002, and the computer-readable storage medium 1003 may be connected via a bus or other means.

[0080] Among them, the communication interface 1002 is used to receive and send data, the computer-readable storage medium 1003 can be stored in the memory of the electronic device, the computer-readable storage medium 1003 is used to store a computer program, the computer program includes program instructions, and the processor 1001 is used to execute the program instructions stored in the computer-readable storage medium 1003.

[0081] The processor 1001 (or CPU (Central Processing Unit)) is the computing core and control core of the electronic device, which is suitable for implementing one or more instructions, and specifically suitable for loading and executing one or more instructions to implement corresponding method processes or corresponding functions.

[0082] The processor 1001 is configured to execute the following process:

[0083] For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal formed by processing each of the cross-correlated interference signals;

[0084] Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of is the reflectivity corresponding to the wavelength.

[0085] The specific method is described in Example 1 and will not be repeated here.

[0086] Embodiment 4:

[0087] This implementation provides a computer-readable storage medium (Memory), which is a memory device in an electronic device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the electronic device and, of course, extended storage media supported by the electronic device. The computer-readable storage medium provides a storage space that stores the processing system of the electronic device.

[0088] In addition, the storage space also stores one or more instructions suitable for being loaded and executed by the processor, and these instructions may be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here may be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory; optionally, it may also be at least one computer-readable storage medium located away from the aforementioned processor.

[0089] 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 implement the following process:

[0090] For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal formed by processing each of the cross-correlated interference signals;

[0091] Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of is the reflectivity corresponding to the wavelength.

[0092] The specific method is described in Example 1 and will not be repeated here.

[0093] Embodiment 5:

[0094] The present implementation provides a computer program product or a computer program, which includes 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 the processor executes the computer instructions, so that the electronic device performs the following process:

[0095] For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal formed by processing each of the cross-correlated interference signals;

[0096] Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of is the reflectivity corresponding to the wavelength.

[0097] The specific method is described in Example 1 and will not be repeated here.

[0098] A person skilled in the art can appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0099] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital line (DSL)) 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, a data center, etc. that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

[0100] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spectral reflectance testing method, characterized in that: The process includes: For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal formed by processing each of the cross-correlated interference signals; The combined signal is: ； Reflectivity of different layers of sample tissue when the interlayer material is the same tissue Equal to the same reflectivity , according to the trigonometric function addition formula, and Equivalently, taking the absolute value we get: ； in, is the phase obtained by summing the trigonometric functions, is the number of spectrum acquisitions, is the number of discrete frequencies contained in the target layer, is the starting position of the target layer, is the reflectivity of different layers of the sample tissue, is the optical path difference between the reference arm and the sample arm, The optical path difference that changes for each spectral acquisition; Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of is the reflectivity corresponding to the wavelength; Constant coefficients of combined signals It is the product of: the conversion coefficient of light intensity to electrical signal in the spectrometer, the transmittance of the entire optical path from the light source to the sample arm reflector, the transmittance of the light reflected from the reference arm to the spectrometer, the transmittance of the entire optical path from the light source to the reference arm sample, the transmittance of the light reflected from the sample arm to the spectrometer, and the reflectance of the reference arm reflector.

2. The spectral reflectance testing method according to claim 1, characterized in that: The maximum number of spectral acquisitions is for the wavelength The optical path difference changes with each spectrum acquisition The ratio is rounded off.

3. The spectral reflectance testing method according to claim 1, characterized in that: Processing each of the cross-correlated interference signals comprises: Will domain signal After linearization, it is converted to domain signal, ,exist After Fourier transform in the domain, segmentation of the target layer, inverse Fourier transform and λ domain linearization, the processed cross-correlation interference signal is obtained. .

4. The spectral reflectance testing method according to claim 1, characterized in that: Interlayer reflectivity of target area for: ； in, represent The value after rounding.

5. An OCT system for spectral reflectance testing, characterized in that: include: Light source, coupler, first collimator, reflector, piezoelectric displacement platform, second collimator, scanning galvanometer, system, human eye, spectrometer and processing terminal, the first collimator and reflector constitute the reference arm, the second collimator, scanning galvanometer and The system comprises a sample arm; The light source is connected to the coupler via an optical fiber, the coupler is respectively connected to the first collimator and the second collimator via an optical fiber, the first collimator is opposite to the reflector, and the reflector is arranged on the piezoelectric displacement platform, and the reflector can be driven by the piezoelectric displacement platform to approach or move away from the first collimator; The second collimator, the scanning galvanometer, the The system is arranged in sequence along the optical path, and the human eye is The second focusing lens of the system is located oppositely, the coupler is connected to the spectrometer, the spectrometer is connected to the processing terminal, and the processing terminal is configured to perform the following method: For any wavelength , perform multiple spectral acquisitions of the target area to obtain multiple cross-correlated interference signals corresponding to the wavelength , a combined signal is formed by processing each of the cross-correlated interference signals; the combined signal is: ； Reflectivity of different layers of sample tissue when the interlayer material is the same tissue Equal to the same reflectivity , according to the trigonometric function addition formula, and Equivalently, taking the absolute value we get: ； in, is the phase obtained by summing the trigonometric functions, is the number of spectrum acquisitions, is the number of discrete frequencies contained in the target layer, is the starting position of the target layer, is the reflectivity of different layers of the sample tissue, is the optical path difference between the reference arm and the sample arm, The optical path difference that changes for each spectral acquisition; Get the constant coefficient of the combined signal And the trigonometric coefficients , according to the combined signal and The ratio of the wavelength is the corresponding reflectivity; the constant coefficient of the combined signal It is the product of: the conversion coefficient of light intensity to electrical signal in the spectrometer, the transmittance of the entire optical path from the light source to the sample arm reflector, the transmittance of the light reflected from the reference arm to the spectrometer, the transmittance of the entire optical path from the light source to the reference arm sample, the transmittance of the light reflected from the sample arm to the spectrometer, and the reflectance of the reference arm reflector.

6. The OCT system for spectral reflectance testing according to claim 5, characterized in that: The maximum number of spectral acquisitions is for the wavelength The optical path difference changes with each spectrum acquisition The ratio is rounded off.

7. The OCT system for spectral reflectance testing according to claim 5, characterized in that: Processing each of the cross-correlated interference signals comprises: Will domain signal After linearization, it is converted to domain signal, ,exist After Fourier transform in the domain, segmentation of the target layer, inverse Fourier transform and λ domain linearization, the processed cross-correlation interference signal is obtained. .

8. The OCT system for spectral reflectance testing according to claim 5, characterized in that: Interlayer reflectivity of target area for: ； in, represent The value after rounding.

9. A computer device, characterized in that: include: A processor and a computer readable storage medium; a processor adapted to execute a computer program; A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the spectral reflectance testing method according to any one of claims 1 to 4 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is suitable for being loaded by a processor and executing the spectral reflectance testing method according to any one of claims 1 to 4.

11. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the spectral reflectance testing method according to any one of claims 1 to 4 is implemented.

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