Method and system for detecting ultra-broadband optical spectrum of ultrahigh-resolution spectrum field OCT

Abstract

The invention discloses an ultra-wideband spectrum detection method of an ultrahigh resolution spectral-domain OCT and a system. Low-coherence light emitted from a broadband light source enters a broadband optical fibre coupler through a photoisolator, and respectively enters a scanning probe and a reference arm after light splitting; returned light is processed through interference in the broadband optical fibre coupler; and interference signals are transformed into different spectrums in a detection arm, the spectrums are processed after being transmitted into a computer, and an image is reconstructed through inverse Fourier transform. A double grating is introduced into the detection arm to generate orthogonal chromatic dispersion, and a DMD and an area array CCD are utilized to realize the fast parallel detection of the ultra-wideband spectrum at the same time. A double grating system can reduce the field coverage of a spectral imaging system, and solve the problems such as field curvature, spectrum interference and the like during imaging of large field coverage spectrum; and the DMD increases the range of the CCD spectrum measurement with finite scales and finite pixel numbers and the resolution response of the spectrum measurement, and realizes the super resolution detection of the ultra-wideband spectrum at the same time, thereby realizing high Signal-to-Noise and ultrahigh resolution spectral-domain OCT imaging.

Description

technical field [0001] The invention relates to optical coherence tomography technology, in particular to an ultra-broadband spectral detection method and system of ultra-high resolution spectral domain OCT. Background technique [0002] Optical coherence tomography (OCT) is an emerging optical imaging technology that can realize non-contact, non-invasive, high-resolution imaging of the tissue structure and physiological functions inside the living body, and can be used for early detection of diseases. And in the field of body biopsy has a wide range of applications. [0003] The current spectral domain OCT system uses a high-speed linear array CCD to collect the spectral components of the interference signal in parallel, and can obtain the depth information of the sample without axial scanning. It has the characteristics of fast and high sensitivity. The core of the system is the fast grating spectrometer of the detection arm. . In the OCT system, the axial resolution of ...

AI Technical Summary

Problems solved by technology

Since the increase in the number of linear CCD pixels means an increase in the field of view, unless a more complex optical imaging system is designed, serious field curvature will inevitably appear on the image surface (CCD photosensitive surface), and due to the spectral range If it is too wide, the dispersion phenomenon is serious, resulting in different focusing positions of different colors of light, which makes the spectrometer unable to completely separate the various colors of light and introduces cross-talk (cross-talk), the detection signal-to-noise ratio decreases and the axial resolution of the system decreases, ultimately reducing the imaging quality

Reducing the spectral resolution of the spectrometer means reducing the imaging depth of spectral domain OCT

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