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OCT image reconstruction method based on non-uniform discrete Fourier transform

A discrete Fourier and Fourier transform technology, applied in image enhancement, image analysis, image data processing, etc., can solve problems such as complex conjugate image interference, achieve interference elimination, achieve frequency domain expansion, and improve sensitivity reduction The effect of the phenomenon

Pending Publication Date: 2022-02-08
佛山市灵觉科技有限公司
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Problems solved by technology

In addition, the existing non-uniform Fourier transform algorithm reconstructs all k-space data, which will interfere with the complex conjugate image

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  • OCT image reconstruction method based on non-uniform discrete Fourier transform
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  • OCT image reconstruction method based on non-uniform discrete Fourier transform

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Embodiment Construction

[0038] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0039] Such as figure 1 As shown, a kind of OCT image reconstruction method based on non-uniform discrete Fourier transform that the present invention proposes comprises the following steps:

[0040] Step 1. Place mirrors on the reference arm and the sample arm to adjust the interference signal in the OCT system. The light source is a broadband light source, using a fiber-optic OCT optical system. The broadband light source reaches the reference arm and the sample arm after being split by the coupler, and the return light of the reference arm is A R exp(ik·2r), where k is the wave number, 2r is the optical path of the reference arm, A R is the reflection coeffici...

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Abstract

According to the OCT image reconstruction method based on the non-uniform discrete Fourier transform, the discrete Fourier transform method of non-uniform time sampling points and non-uniform frequency sampling points is used, so that the loss of high-frequency signals in the discrete Fourier transform process is reduced, and the phenomenon of sensitivity decline at a relatively large depth is improved; conversion and interpolation of a lambda space and a k space in a traditional reconstruction method are not needed, and the operation process and the calculation amount of reconstruction depth information are simplified; frequency domain expansion can be realized by resampling the frequency domain, so that huge calculation amount caused by zero padding of previous and later data is avoided; a non-uniform time sampling point method is selected to eliminate the influence of the linear array CCD on the quality of a reconstructed image when the linear array CCD carries out nonlinear sampling on an original signal; and half of the frequency domain space is selected, and the interference of the complex conjugate image on the imaging quality is eliminated similar to Hilbert transform.

Description

technical field [0001] The invention belongs to the technical field of optical coherence tomography, in particular to an OCT image reconstruction method based on non-uniform discrete Fourier transform. Background technique [0002] Optical coherence tomography (Optical coherence tomography, OCT) is a non-invasive, non-contact imaging method that uses a Michelson interferometer optical path to obtain high-resolution tissue microstructure cross-sectional images. OCT has revolutionized ophthalmic diagnostics due to its non-invasive and ability to produce micrometer-resolution cross-sectional and volumetric imaging. OCT is a shallow imaging method, which is suitable for optical diagnostic technology of 2-3mm shallow biological tissue imaging. Compared with traditional time-domain OCT based on scanning optical delay lines, Fourier-domain OCT can reconstruct the depth profile of biological tissues by performing Fourier transform on the collected raw spectral data. There are two ...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005G06T11/006G06T2207/10101G06T2207/20056
Inventor 吴南寿黄丽媛李泽张章杨旭伦何镇楠刘永安黄鸿衡黄铭斌张浩胡积烨
Owner 佛山市灵觉科技有限公司
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