Image correction method for optical coherence tomography system

Abstract

The present invention proposes an image correction method for an optical coherence tomography system. The steps are as follows: collect the original three-dimensional interference signal containing sample depth information in the OCT system; calculate the emergent light vector of the scanning mechanism, and measure and calculate the scanning mechanism at different scanning angles. The existing optical path difference; the sample depth information in the original three-dimensional interference signal is compensated for the phase difference caused by the optical path difference, and the compensated sample depth information is obtained; the compensated sample depth information is fast Fourier transformed to reconstruct the sample The XYZ three-dimensional image; remove the mirror information of the XYZ three-dimensional image in the Z direction to obtain the restored XYZ three-dimensional image of the sample. The present invention performs phase difference compensation on the sample depth information data in the original three-dimensional interference signal, and performs fast Fourier transform on the compensated sample depth information to eliminate image distortion caused by the sample depth direction, and is not limited to the OCT system. The structure does not affect the accurate measurement of the physical structure of the sample.

Description

technical field [0001] The present invention relates to the technical field of optical coherence tomography (OCT for short), in particular to an image correction method for an optical coherence tomography system. Background technique [0002] Optical coherence tomography (OCT) is an emerging technology that has emerged in the past decade. It is based on the principle of light interference and uses a broadband light source to achieve high-resolution depth tomography with a resolution of several microns. OCT can be divided into time domain and frequency domain according to the principle of image processing. Time domain OCT (TDOCT) performs tomographic scanning in the depth direction of the sample by moving the reference arm, while frequency domain OCT (FDOCT) divides the broadband light source into many independent The spectrum is obtained by performing Fourier transform on the finally obtained interference data to complete the depth tomography, so there is no need to move the...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that the scanning distortion of the existing technology causes the inconsistency between the imaging of the OCT system and the image of the sample itself, which affects the measurement of the physical structure of the sample, the present invention proposes an image correction method for an optical coherence tomography system

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