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

A technology of optical coherence tomography and dispersion compensation, which is applied in medical science, sensors, diagnostic recording/measurement, etc., and can solve problems such as overcompensation and undercompensation

Inactive Publication Date: 2018-02-06
BEIJING UNIV OF TECH
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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 whe

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

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[0043] Typical embodiments and features of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] The composition of the frequency-domain OCT dispersion continuous compensation imaging system of the present invention is as follows: figure 1 As shown, it is composed of a 2×2 fiber coupler with a splitting ratio of 75:25 to connect the transmitting optical path, the reference arm optical path, the signal arm optical path and the interference optical path. Emitting optical path; a reference arm optical path consisting of the second optical fiber 3, the first beam expanding collimator 7, the reflector 8, and the piezoelectric translation stage 9; the third optical fiber 4, the second beam expanding collimator 10, the vibrating mirror 11. The optical path of the sample arm composed...

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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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Application Information

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IPC IPC(8): A61B5/00
CPCA61B5/0066
Inventor 江竹青王博晨胡宇捷韩凤林
Owner BEIJING UNIV OF TECH
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