Two-dimensional scan fiber optic probe for endoscopic optical coherence tomography

Abstract

The invention discloses a two-dimensional scan fiber optic probe for endoscopic optical coherence tomography. The fiber optic probe is based on an asymmetric fiber cantilever structure which can form two independent orthogonal resonant modes which are mutually unaffected; and by using a single driving signal which comprises two resonant signal components, the two orthogonal resonant modes of the asymmetric fiber cantilever can be simultaneously excited to form a two-dimensional Lissajous scan pattern. The provided two-dimensional scan fiber optic probe based on the asymmetric fiber cantilever structure forms lens fibers by using single mode fibers and gradient index fibers, and then combines with a gradient index lens to realize the illumination of samples and the collection of backward scattered light. The two-dimensional scan fiber optic probe uses a position-sensitive detector integrated in the probe, can record the two-dimensional paths of the emergent light of the fiber optic probe in real time in an imaging cross section, and can realize accurate reconstruction of scan position information.

Description

technical field [0001] The invention relates to optical coherence tomography (OCT) technology, in particular to a two-dimensional scanning optical fiber probe for endoscopic optical coherence tomography. Background technique [0002] Optical coherence tomography (OCT) is an emerging biomedical optical imaging technology, which can realize non-contact, non-damaging, high-resolution imaging of the structure and physiological functions of biological tissues, and can be used in the early stages of diseases. It has broad application prospects in the field of detection and in vivo biopsy. [0003] Optical coherence tomography technology has been developed so far, and has formed three types: time-domain OCT system, spectral domain OCT system and frequency-swept OCT system. The early time-domain OCT system achieved tomography of biological samples through axial mechanical scanning, and the spectral domain OCT system and swept-frequency OCT system could image without axial scanning,...

AI Technical Summary

Problems solved by technology

The above-mentioned methods all have their inherent advantages and disadvantages. For example, the scanning probe based on rotating optical components and optical couplers has low coupling efficiency of light energy, requires precise optical alignment, and the probe size is relatively large; based on MEMS technology The micro-probe needs complex manufacturing process, and its manufacturing cost and manufacturing difficulty are relatively high; while the scanning probe based on the piezoelectric ceramic tube needs a high voltage to drive, requires high energy consumption, and the application in the human body has certain security risks

Images