Full-range frequency domain optical coherence tomography method and system thereof

Abstract

Disclosed are a method and a system for in frequency domain optical coherent tomography imaging. The method employs sine phase modulation to recreate complex amplitude of the coherent frequency interference signal; and then performs inverse Fourier transform to the complex amplitude to get the tomographic images of the tested objects and eliminate the complex conjugate image, direct current background and self-coherent noise three spurious images, which enlarges the imaging depth of frequency domain optical coherent tomography imaging is two times larger than the original depth and realizes full depth finding of frequency domain optical coherent tomography imaging.

Description

technical field [0001] The present invention relates to optical coherence tomography (Optical Coherence Tomography, hereinafter referred to as OCT), in particular to a full-range detection method for reconstructing a low-coherence optical frequency-domain interference complex signal (complex interferometric signal) using sinusoidal phase modulation technology A frequency domain optical coherence tomography (Fourier Domain Optical Coherence Tomography, FD-OCT for short) method and system thereof. Background technique [0002] Optical coherence tomography (OCT) is based on the principle of low coherence interferometry (LCI), which can perform non-invasive real-time and in vivo tomography on the tiny structures within a few millimeters deep in scattering media such as biological tissues. imaging with a depth resolution of several microns. Since Huang et al first proposed the concept of OCT in 1991 and applied it to the tomographic imaging of the human eye retina and coronary a...

AI Technical Summary

Problems solved by technology

Although instantaneous or simultaneous phase shift can be achieved, it is not sensitive to environmental vibrations, but because the splitting ratio of the fiber coupler is sensitive to changes in ambient temperature, the amount of phase shift will drift with temperature changes, and the system requires more than two probes detector, it is necessary to ensure the synchronization of all detectors to collect signals, the system is complex

[0006] From the above analysis, it can be seen that there is no frequency-domain optical coherence tomography technology that has strong anti-interference ability, has nothing to do with the wavelength of the light source, has a simple system structure, and can realize full-depth detection.

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