Method and system of time-domain optical coherence tomography without depth scan

Abstract

The invention provides a method and a system of time-domain optical coherence tomography without depth scan. On the basis of a time-domain optical coherence tomography method, the method of the invention comprises substituting convex lens with cylindrical surface for focusing lens interfering with a reference arm to form linear reference light, introducing continuous light path difference in a linear length direction of the reference light through tilting a reference planar mirror of the reference arm, substituting a one-dimensional detector array for a point photoelectric detector, acquiring interference signals of a sample to be measured at continuous different depth of a same detecting point, carrying out a Hilbert transformation analysis on the interference signals in the linear length direction of the reference light after removing direct current background, and finally obtaining a tomographic profile of the sample to be measured. The method and the system of the invention can realize one-dimensional optical coherence tomography with single exposure, and have the advantages of a simple structure, a high imaging speed, no parasitic image, and insensitivity to motion blur. In a situation of not sacrificing a system signal-to-noise ratio, time-domain optical coherence tomography without depth scan can be realized.

Description

technical field [0001] The present invention relates to optical coherence tomography (Optical Coherence Tomography, OCT for short), in particular to a method and system for Time-domain Optical Coherence Tomography (TD-OCT for short) without depth scanning. Background technique [0002] Optical coherence tomography (OCT) is an optical tomography technology developed in recent years. It can perform high-resolution non-invasive imaging of microstructures within a few millimeters in highly scattering media such as biological tissues. It has broad application prospects in the fields of living tissue imaging and medical imaging diagnosis. [0003] The earliest OCT system was time-domain optical coherence tomography (TD-OCT) (see prior art [1], D. Huang, E.A. Swanson, C.P. Lin, J.S. Schuman, W.G. Stinson, W. Chang, M.R. Hee , T. Flotte, K. Gregory, C.A. Puliafito and J.G. Fujimoto, "Optical coherence tomography", Science, Vol.254, pp.1178-1181, 1991). It scans the axial depth of ...

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Problems solved by technology

However, like traditional FD-OCT, parallel FD-OCT still has problems such as complex conjugate mirror parasitic images

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