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Chromatic dispersion compensation method of FD-OCT (Fourier-Domain Optical Coherence Tomography) system

A technology of optical coherence tomography and dispersion compensation, applied in medical science, measurement of scattering characteristics, diagnosis, etc., can solve problems such as incomplete interferogram, weakened depth-resolution dispersion compensation, and suboptimal window size, etc., to achieve compensation of high-order dispersion , the effect of the best dispersion compensation effect

Active Publication Date: 2015-07-15
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

The determination of the window size in this method is very critical. If the window is too wide, the effect of depth-resolution dispersion compensation will be weakened. If the window is too narrow, the filtered interferogram of a certain layer will be incomplete, resulting in distortion of the reconstructed signal of this layer.
This method uses a threshold to determine the size of the window, and the determined window size is often not optimal, especially when adjacent layers alias each other due to dispersion broadening, the aliased layers will be divided into the same window Use the same amount of dispersion compensation, which limits the effect of this deep dispersion compensation method

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  • Chromatic dispersion compensation method of FD-OCT (Fourier-Domain Optical Coherence Tomography) system
  • Chromatic dispersion compensation method of FD-OCT (Fourier-Domain Optical Coherence Tomography) system
  • Chromatic dispersion compensation method of FD-OCT (Fourier-Domain Optical Coherence Tomography) system

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[0049] The present invention will be further described below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0050] see figure 1 , figure 1 It is a schematic diagram of the structure of the fiber-optic frequency-domain optical coherence tomography system. It includes a low-coherence light source 1, an isolator 2 is placed in the direction of the output beam of the low-coherence light source, the output end of the isolator is connected to a port 31 of a coupler 3, and the coupler 3 divides the light into a reference arm optical path 4 and a sample arm Optical path 5, the output light from port 33 of the coupler 3 passes through the collimating lens 41 of the reference arm and then irradiates on the reference plane mirror 42, and the output light from port 34 of the coupler 3 passes through the collimating lens 51 of the sample arm and then passes through the two-dimensional scanni...

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Abstract

The invention discloses a chromatic dispersion compensation method of an FD-OCT (Fourier-Domain Optical Coherence Tomography) system. According to the chromatic dispersion compensation method disclosed by the invention, the chromatic dispersion mismatch induced by an optical path and a sample in the system can be automatically compensated from thick to thin by adopting a window iteration method, thus a broadening effect of chromatic dispersion in the system can be removed, and the resolution of the system can be increased. The chromatic dispersion compensation method has the advantages that different depths of the inner part of the sample can be compensated by adopting corresponding chromatic dispersion coefficients, the influence on a depth resolution chromatic dispersion compensation effect when the window width which is determined by adopting a single threshold value is unsuitable can be avoided, and thus an optimal compensation effect on the chromatic dispersion in different depths induced by the sample can be achieved.

Description

technical field [0001] The present invention relates to frequency-domain optical coherence tomography (Fourier-Domain Optical Coherence Tomography, referred to as FD-OCT), in particular to a dispersion compensation method for a frequency-domain optical coherence tomography system. Background technique [0002] Optical coherence tomography (OCT for short) is a non-invasive high-resolution biomedical optical imaging technology that can detect microstructures inside biological tissues in vivo, and has been widely used in biological research and clinical practice. medical field. Frequency-domain optical coherence tomography (FD-OCT) obtains the tomogram of the measured sample by detecting the interference spectrum and inverse Fourier transforming it. Compared with time-domain optical coherence tomography (Time-Domain Optical Coherence Tomography , referred to as TD-OCT) has the advantages of fast imaging speed and high detection sensitivity, and has become the mainstream resear...

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Application Information

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IPC IPC(8): A61B5/00G01N21/47
Inventor 张行王向朝李中梁南楠王瑄陈艳郭昕
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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