Coherence gating and focal plane coincided and dynamic focusing type retina full-field OCT (optical coherence tomography) imager

Abstract

The invention discloses a coherence gating and focal plane coincided and dynamic focusing type retina full-field OCT (optical coherence tomography) imager, which comprises a broadband light source, acollimating lens, a first lens, a spectroscope, a dichroscope, a second lens, a Badal mechanism, a third lens, a water column, a reference lens, a driver, a dispersion compensator, a fourth lens, a fifth lens, a detector, an electric translation platform, a sighting mark and the like. By the Badal mechanism formed by the first lens, the spectroscope, the dichroscope and the second lens, especiallyby the electric translation platform, the spectroscope and the dichroscope are driven to move axially for dynamic focusing of the retina. When a front focal length f2 of the second lens, a distance dbetween the second lens and a human eye dioptric system and a back focal length fe of the human eye dioptric system meet conditions as shown in the specification, a coherence gating and a focal planecan be constantly kept coincided in a dynamic focusing process. The system structure, control, adjustment and the like are all greatly simplified, and high-transverse-resolution and high-longitudinal-resolution OCT images 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...

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

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