Dispersion compensation method based on Fourier domain optical coherence tomography

A technology of optical coherence tomography and dispersion compensation, which is applied in the measurement of phase influence characteristics, etc., can solve the problem of reducing system resolution, achieve simple data processing, save system cost, and improve axial resolution

Active Publication Date: 2022-07-26
TSINGHUA UNIV
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Problems solved by technology

[0009] To sum up, dispersion mismatch will reduce the resolution of the system. How to accurately and quickly perform dispersion compensation on the OCT system has always been a research hotspot in OCT.

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  • Dispersion compensation method based on Fourier domain optical coherence tomography
  • Dispersion compensation method based on Fourier domain optical coherence tomography
  • Dispersion compensation method based on Fourier domain optical coherence tomography

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[0041] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0042] like figure 1 As shown, the dispersion compensation method based on Fourier domain optical coherence tomography according to the embodiment of the present invention mainly includes the following steps:

[0043] Step 1. Obtain the interference signal of the A-scan imaged by the FD-OCT system on the sample;

[0044] Step 2, preprocessing the interference signal to obtain a preprocessed interference signal, wherein the preprocessed interference signal only contains the sample light reference light coherent signal;

[0045] Step 3, providing a dispersion phase data set containing only the second-order dispersion coefficient term and the third-order dispersion coefficient term;

[0046]Step 4: Multiplying the preprocessed interference signal an...

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Abstract

The invention discloses a dispersion compensation method based on Fourier domain optical coherence tomography, comprising: acquiring an A-scan interference signal of an FD-OCT system imaging a sample; preprocessing the interference signal to obtain the interference signal from the interference signal Obtain the preprocessed interference signal containing only the coherent signal of the sample light and the reference light; provide the dispersion phase data set containing only the second-order dispersion coefficient term and the third-order dispersion coefficient term; According to the preprocessed interference signal and the dispersion phase data set , obtain the depth space data set; obtain the dispersion compensation phase data through the peak-seeking operation of the depth space data set; obtain the depth image data after dispersion compensation according to the preprocessed interference signal and the dispersion compensation phase data. The invention realizes accurate and fast dispersion compensation for the imaging of the FD-OCT system, and ensures the high-resolution imaging of the FD-OCT system while ensuring the real-time performance of data processing and meeting the requirements of real-time imaging.

Description

technical field [0001] The invention relates to the technical field of optical signal processing, in particular to a dispersion compensation method based on Fourier domain optical coherence tomography. Background technique [0002] Optical coherence tomography (OCT) was first proposed by David Huang in 1991 at the end of the last century and published in the journal "Nature". It is a biomedical imaging technology with non-invasive, non-invasive, high-resolution, real-time imaging features. In the thirty years since the technology was proposed, OCT has been successfully applied in medical fields such as oncology, dentistry, cardiology, dermatology, etc. The most successful application is in ophthalmology. Due to the high transmittance of the lens to light, the OCT can perform high-resolution imaging of the fundus, which helps doctors to non-destructively detect the lesions of the fundus and propose a treatment plan. OCT technology has become the "gold standard" for ophthalmo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45
CPCG01N21/45
Inventor 郭翔宇孙利群
Owner TSINGHUA UNIV
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