Long-focus deep-dark-field retina OCT system adopting Bessel band lighting mode

Abstract

The invention discloses a long-focus deep-dark-field retina OCT system adopting a Bessel band lighting mode. The long-focus deep-dark-field retina OCT system comprises a light source, an optical fiber coupler, an iris diaphragm, an axicon, a spectroscope, a horizontal and vertical scanner, a detection end, a data acquisition card, a computer and the like. According to the system, the axicon is adopted to from Bessel band dark field lighting; lateral resolution about 37% higher than that of a normal retina OCT system without the cost of a retina AO-OCT system and the like, and the long-focus deep-dark-field retina OCT system is a simple system for filling up gaps between the normal retina OCT system and the retina AO-OCT system; the focal depth range is remarkably expanded, and the lateral resolution maintains unchanged in the long focal depth range, so that high lateral resolution observation can be conducted on all tissues in the depth range of the retina, and the long focal depth is further beneficial to imaging of ametropic eyes; retina images with a high signal to noise ratio, a high contrast ratio and high three-dimensional feeling can be obtained.

Description

technical field [0001] The invention relates to an optical high-resolution imaging device for living human retina, in particular to a telephoto deep dark-field retinal OCT imaging device which adopts an axicon to realize Bessel annular zone illumination. Background technique [0002] Retinal imaging methods mainly include fundus camera, fluorescein angiography, confocal scanning laser ophthalmoscope, and optical coherence tomography (Optical coherencetomography, OCT) imager, etc. Among them, only the horizontal and vertical resolutions of OCT technology are independent of each other, which are respectively determined by the focusing conditions of the beam and the bandwidth of the light source, so it is possible to obtain high horizontal and high vertical resolutions at the same time. Using a broadband or even ultra-broadband spectral light source, it is easy to obtain a longitudinal resolution below 10 μm, or even reach the cell level (depending on the cell size of about 2-4...

AI Technical Summary

Problems solved by technology

[0007] In conclusion, there is no report on a retinal OCT imaging technique that simultaneously has the following three characteristics: 1) significantly increase δr to fill the δr gap between conventional retinal OCT and retinal AO-OCT techniques; 2) maintain high δr while maintaining high δr , still have a long enough l, so that high-resolution imaging of all tissues in the depth range of the retina; 3) dark field imaging to improve the signal-to-noise ratio, contrast, and stereoscopic effect of the image

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