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A retinal full-field oct imager with coherence gate and focal plane overlapping and dynamic focusing

A technology of dynamic focusing and coherence gate, which is applied in the fields of eye testing equipment, medical science, diagnosis, etc., can solve the problem of not being able to obtain high Δx images of the retina, and achieve the effect of simplifying control and adjustment.

Active Publication Date: 2021-09-07
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

However, its combination with dynamic focusing technology has not been seen, let alone the characteristic that the coherence gate and the focal plane always coincide during the dynamic focusing process, so the existing retinal full-field OCT system cannot obtain high Δx images of all layers of the retina

Method used

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  • A retinal full-field oct imager with coherence gate and focal plane overlapping and dynamic focusing
  • A retinal full-field oct imager with coherence gate and focal plane overlapping and dynamic focusing
  • A retinal full-field oct imager with coherence gate and focal plane overlapping and dynamic focusing

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Such as figure 1 As shown, the present invention proposes a retinal full-field OCT imager with coherence gate and focal plane overlapping and dynamic focusing, including: a broadband light source 1, a collimating mirror 2, a first lens 3, a beam splitter 4, and a dichroic Mirror 5, second lens 6, Badal mechanism 7, third lens 10, water column 11, reference mirror 12, driver 13, translation stage 14, dispersion compensator 15, fourth lens 16, fifth lens 17, detector 18, Bottom plate 19 , electric translation stage 20 , visual mark 21 , sixth lens 22 and seventh lens 23 .

[0031] After the light beam emitted by the broadband light source 1 is collimated by the collimator 2, it enters the beam splitter 4 through the first lens 3, the part reflected by the beam splitter 4 is the sample beam, and the transmitted part is the reference beam....

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Abstract

The invention discloses a retinal full-field OCT imager with coherence gate and focal plane coincident and dynamic focus adjustment, comprising a broadband light source, a collimator mirror, a first lens, a beam splitter, a dichroic mirror, a second lens, and a Badal mechanism , third lens, water column, reference mirror, driver, dispersion compensator, fourth lens, fifth lens, detector, electric translation stage and visual mark, etc. Through the Badal mechanism composed of the first lens, the beam splitter, the dichroic mirror and the second lens, specifically, the motorized translation stage moves the beam splitter and the dichroic mirror axially to perform dynamic focus on the retina. Front focal length of the second lens f 2 , the distance d from the second lens to the refractive system of the human eye, and the back focus f of the refractive system of the human eye e , when the conditions are met, the coherence gate and the focal plane can always be kept coincident during the dynamic focusing process. The system structure, control and adjustment of the present invention are greatly simplified, and OCT images with high horizontal and vertical resolutions of all layers of the retina can be obtained.

Description

technical field [0001] The invention relates to the technical field of OCT imagers, in particular to a retinal full-field OCT imager in which a coherence gate overlaps a focal plane and dynamically adjusts focus. Background technique [0002] The retina is not only related to visual acquisition and brain cognition (the optic nerve is connected to the brain), but also a window for the performance of eye diseases and some systemic diseases. It is possible to realize early detection of lesions through its monitoring. The longitudinal structure of the retina is extremely complex, and within a thickness of less than 400 μm (different regions have different thicknesses), it contains about 8 layers of tissue from the nerve fiber layer to the pigment epithelial cell layer, as well as the internal limiting membrane, external limiting membrane and Bruch's membrane etc. They have different tissue components, structural forms and functions, and their observation requires that the imagin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B3/10A61B3/14
CPCA61B3/0016A61B3/102A61B3/14
Inventor 杨亚良邱悦
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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