Method and system for detecting parallel OCT based on spectrum coding and orthogonal light splitting

Abstract

The invention discloses a method and system for detecting parallel OCT based on spectrum coding and orthogonal light splitting. A series of optical frequency combs with frequencies which are not overlapped are formed in different horizontal detecting positions of a sample, and spectrum coding and horizontal lighting of the sample in the horizontal position are achieved. A detecting arm of a parallel OCT detecting system is formed by two levels of space orthogonal light splitting spectrographs, and the detecting arm is composed of a virtual image phase controlling array and a raster. A high-speed area array CCD is used as a detector to interfere with parallel detecting of spectral signals. Spectral information is finally transmitted to a computer, and fast reconstruction of horizontal position information and axial depth information of the sample is achieved in the computer. According to the method and system for detecting the parallel OCT based on the spectrum coding and the orthogonal light splitting, under the premise that the requirement for a high spectral resolution can be met, an all-fiber system replaces a space optical system, in addition, the problem of mutual crosstalk existing in previous parallel detecting can be avoided, and therefore parallel spectral domain OCT imaging with a high signal-to-noise ratio, a high horizontal resolution and a high axial resolution can be achieved.

Description

Technical field [0001] The invention belongs to the optical field, and relates to a parallel OCT detection method and system based on spectral coding and orthogonal light splitting. Background technique [0002] Optical coherence tomography (Optical Coherence Tomography, OCT) can implement non-contact, damage-free, high-resolution in vivo imaging of the internal tissue structure and physiological functions of the living body, and has a wide range of applications in the field of biomedical imaging. [0003] The current spectral domain OCT system collects the spectral components of the interference signal through a high-speed linear CCD (or linear CMOS). The depth information of the sample can be obtained without axial scanning. It has the characteristics of fast and high sensitivity, but due to the need for horizontal scanning Therefore, the imaging speed is still limited, and it is not suitable for measuring moving samples that require a very short imaging time. Therefore, it is n...

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Problems solved by technology

[0006] The Tatsutoshi Shioda group of Nagaoka University in Japan used a virtual image phased array to split the light in the reference arm to avoid coherent crosstalk, but because the probe light was not split, the coherent contrast decreased, and the fiber optic system was also unable to be used

[0007] The D. Yelin group of Harvard Medical School proposed a spectrally coded endoscope to realize the parallel imaging technology of a single optical fiber, but the axial resolution decreased due to the narrowing of the spectral bandwidth after the detection light was split by the grating

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