Polarization demodulation method for polarization-sensitive optical coherence tomographyimaging of conduit

Abstract

The invention discloses a polarization demodulation method for polarization-sensitive optical coherence tomography (PS-OCT) imaging of a conduit. The polarization demodulation method comprises the following steps: setting a polarization state of an input light of a conduit PS-OCT system; and setting reference light on an H path and a V path in the system to have equal light intensity; performing dispersion compensation and interpolation Fourier transform on an electrical signal measured at a polarization diversity position, and then performing image segmentation; transforming Jones matrixes ata sample depth position and a reference plane position into Mueller matrixes; multiplying the Mueller matrix at the sample depth position by an inverse matrix of the Mueller matrix at the reference plane position to obtain a measured Mueller matrix of a sample; eliminating depolarization and double-attenuation effects; obtaining phase retardation under polar coordinates by the measured Mueller matrix; transforming the phase retardation under polar coordinates from the polar coordinates to Cartesian coordinates, and finally obtaining a birefringent image of the sample of a conduit PS-OCT imaging system. The polarization demodulation method provided by the invention can eliminate a problem that the conduit cannot demodulate birefringence information of the sample in a high-speed rotating state.

Description

technical field [0001] The invention relates to a catheter optical coherence tomography method. In particular, it relates to a polarization demodulation method for catheter polarization-sensitive optical coherence tomography. Background technique [0002] Catheter OCT imaging technology is currently the vascular imaging method with the highest image resolution, especially catheter PS-OCT imaging technology, which can solve the medical problem that the stability of atherosclerotic plaque is difficult to judge in vivo, real-time, and quickly, and can improve arterial Prevention and treatment of atherosclerotic diseases. However, the resolution of the existing OCT system has reached the level where it is possible to judge the nature of tissue plaques, but there are still deficiencies in the tissue penetration ability, image clarity and accuracy of judging the type of tissue plaques. Using PS-OCT technology , Improving the performance of related technologies is the key directi...

AI Technical Summary

Problems solved by technology

However, in catheter PS-OCT, the optical fiber in the catheter needs to be rotated at high speed, which makes the system have strong depolarization and double attenuation effects

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