Frequency domain optical coherence tomography continuous dispersion compensation imaging method and system

Abstract

The invention provides a frequency domain optical coherence tomography continuous dispersion compensation imaging method and system. A broadband superradiant laser device (SLD) is adopted as a recording light source, three-step phase shift is adopted to obtain a complex interference intensity spectrum, a phase value of an interference spectrum intensity complex function is obtained, two-order dispersion coefficient values in several positions of depth layers are obtained through an iterative method, and a change curve of two-order dispersion coefficients with the positions of the depth layersis obtained through fitting. On this basis, the two-order dispersion coefficient values in all the depth layers are directly obtained, continuous dispersion compensation in the depth direction of a chromatogram is achieved, and the method and system have the advantages that phase distribution is extracted through the three-step phase shift, and continuous layered dispersion correction is achievedby directly obtaining the two-order dispersion coefficient values in all the layers through the fitting curve. Optical fiber and an optical fiber coupler are adopted by the optical system to split beams and combine the beams, the optical structure is simple and easy to apply, and a high-quality frequency domain OCT imaging result can be obtained in combination with a continuous dispersion compensation method.

Description

technical field [0001] The invention belongs to an optical coherence tomography dispersion correction method, in particular to a frequency-domain optical coherence tomography dispersion continuous compensation method and system. Background technique [0002] Optical Coherence Tomography (OCT for short) uses the principle of interference to achieve tomographic acquisition of sample depth information. It is a non-contact, non-destructive optical imaging technology that is widely used in the field of biomedical imaging. OCT technology can be divided into time-domain OCT and frequency-domain OCT according to whether it scans in the depth direction. The time-domain OCT system is based on a point-by-point scanning detection method. By changing the optical path difference between the reference arm and the object arm, the detection obtains information at different depths of the sample. Since time-domain OCT needs to move the reference arm to change the optical path difference betwe...

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Problems solved by technology

When the subtracted second-order dispersion phase is greater than the second-order dispersion phase of the depth, it will lead to overcompensation, and when the subtracted second-order dispersion phase is smaller than the second-order dispersion phase of the depth, it will lead to undercompensation phenomenon

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