KR20140112615A - Optical coherence tomography device having mire ring light source - Google Patents

Abstract

An optical coherence tomography (OCT) device having a Mire ring light source enables a Mire ring light source for irradiating measuring light of a ring shape on a cornea of an eye to be installed around an objective lens in a ring shape. Furthermore, the OCT device is capable of: adjusting an operation distance between an OCT unit and the eye to display a ring by a limited light source and a point by a unlimited light source at the same position in a surface image of the eye photographed by a camera; adjusting a focus between the OCT unit and the eye to minimize the thickness of the ring by the limited light source; and adjusting the center between the OCT unit and the eye to match the center of the ring by the limited light source with the center of a pupil of the eye. Therefore, the OCT device can automatically adjust the operation distance, the focus, and the center ring between the OCT unit and the eye of a patient, thereby improving reliability when the cornea or the retina is photographed, as well as improving user convenience.

Description

[0001] The present invention relates to an optical coherence tomography device having a mire ring light source,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ocular device equipped with a miating light source for adjusting a working distance between a patient's eye and an OCT (Optical Coherence Tomography) unit, for example.

1 is a sectional view of a general human eye. The human eye 1 includes a cornea 2, an iris 3, a pupil 4, (Lens) 5, vitreous humor 6, retina 7, and optic nerve 8.

On the other hand, an OCT apparatus for accurately photographing a patient's eyeball as a two-dimensional tomographic image is widely used for ophthalmic surgery such as corneal surgery or cataract surgery.

For example, as shown in FIG. 2, a Time Domain (TD) optical disc apparatus includes a light source, a beam splitter, a reference mirror, and a photo detector ).

In addition, a high-resolution tomographic image of a living body tissue is non-invasively photographed by a sub-micrometer unit using the interference phenomenon of a broadband light source having a short interference distance. For example, as shown in FIG. 3, The wider the bandwidth, the greater the resolution in the depth direction.

However, as shown in FIG. 2, the above-mentioned TD-OCT apparatus must precisely move the reference mirror in the forward and backward directions according to the depth of the single layer of the sample to be photographed, There is a disadvantage in that a moving mechanism capable of being necessary is necessary.

Meanwhile, in recent years, a Spectral Domain (SD) ostition device or a Swept Source (SS) ostition device which does not need to move a reference mirror has been developed and commercialized.

Meanwhile, in recent years, a Spectral Domain (SD) ostition device or a Swept Source (SS) ostition device which does not need to move a reference mirror has been developed and commercialized.

For example, as shown in FIG. 4, the SS-OCT apparatus includes a light source, a coupler, a beam splitter, a reference mirror, A galvanometer mirror, a lens, and a photo detector.

A swept light source is used as the light source, a single photodetector is used as the photodetector, a non-polarized beam splitter is used as the beam splitter, A fixed reference mirror is used instead of moving to a specific position.

That is, the SS-OCT apparatus uses a frequency-variable light source and a fixed reference mirror to take a high-resolution tomographic image of a living tissue.

On the other hand, the ocular device is widely used in a variety of biomedical applications. For example, in ophthalmology, an ocular tomographic image is acquired, and in dermatology, an endothelial tomographic image and a blood flow tomographic image are acquired do.

In addition, in the dentistry, a tooth tomography image is acquired, and in the digestive internal medicine, it is used to acquire a gastrointestinal tomographic image and the like. For example, , Working distance, focus, and centering between the patient's eye and the ocular unit must be precisely adjusted.

The present invention relates to a method and apparatus for accurately and automatically adjusting the working distance, focus, centering, and the like between a patient's eye and an objective lens of an ocular unit, before a cornea or retina of a patient is photographed, Ring light source) is provided.

An ocular device having a miating light source according to the present invention includes an ocular unit for photographing an internal tomographic image of the eye; A camera for photographing a surface image of an eye; A miirring light source for irradiating a ring-shaped measurement light to the cornea of the eye; And a controller for adjusting a working distance between the ocular unit and the eye,

Also, the miaring light source may include a plurality of light emitting devices arranged in a ring shape, wherein at least two light emitting devices among the plurality of light emitting devices are infinite light sources, and the remaining light emitting devices are finite light sources ,

The controller may be configured to calculate a distance between the ocular unit and the eye to be displayed on the surface image of the eye photographed by the camera so that the ring by the finite light source and the point by the infinite light source coincide with each other, Is adjusted,

The controller is characterized in that the focus between the ocular unit and the eye is adjusted so that the thickness of the ring by the finite light source becomes minimum in the surface image of the eye photographed by the camera,

The controller is further configured to adjust the centering between the ocular unit and the eye such that the center of the ring of the finite light source coincides with the center of the pupil of the eye in the surface image of the eye photographed by the camera , ≪ / RTI >

The mechanism may further include a mechanism for moving the ocular unit, wherein the mechanism moves the ocular unit in the anteroposterior direction to adjust the working distance or focus with the eyes, or move the ocular unit in the up-and-down direction , And the centering of the eye is adjusted.

The ocular device provided with the mi- ling light source according to the present invention includes, for example, a mi- loring light source for irradiating the cornea of the eye with measurement light in the form of a ring, in the form of a ring around the objective lens The operating distance between the ocular unit and the eye is adjusted so that the ring of the finite light source and the point of the infinite light source coincide with each other on the surface image of the eye photographed by the camera, The focus between the ocular unit and the eye is adjusted so that the thickness of the ring caused by the finite light source is minimized so that the center of the ring by the finite light source coincides with the center of the pupil of the eye. By adjusting the distance, focus, and centering between the patient's eyes and the OCTU unit automatically, it is possible to improve the convenience, as well as the corneal or retinal The reliability can be improved.

1 shows a single layer structure of a human eye,
Figure 2 shows the configuration of an embodiment of a TD-OCT device,
FIG. 3 shows an embodiment in which the resolution in the depth direction increases as the bandwidth of the light source increases,
4 shows a configuration of an embodiment of an SSO-OCT apparatus,
FIG. 5 illustrates an embodiment of an ocular device having a miating light source according to the present invention,
FIG. 6 is a conceptual block diagram of an ocular device equipped with a miaring light source according to the present invention,
FIG. 7 illustrates an embodiment of a miating light source according to the present invention,
8 is a view showing the construction of an embodiment of an ocular device equipped with a miaring light source according to the present invention,
Figure 9 shows an embodiment in which the operating distance is adjusted according to the invention,
Figure 10 shows an embodiment in which the posus is adjusted according to the invention,
Figure 11 illustrates an embodiment in which centering is adjusted in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of an ocular device having a miating light source according to the present invention will be described in detail with reference to the accompanying drawings.

First, an ocular device having a miaring light source according to the present invention may be applied to ophthalmic surgery systems such as corneal surgery or cataract surgery, or may be manufactured as an independent medical device separate from the ophthalmic surgery system have.

FIG. 5 illustrates an embodiment of an ocular device having a miating light source according to the present invention. The ocular device 100 includes a cover, a joystick, a head rest A chin rest, and a base, and may be connected to a personal computer (PC) or the like.

On the other hand, in the case of photographing the cornea or the retina of the patient, the patient closely contacts his or her face to the chin rest and head restraint, and the photographer operates the joystick to move the ocular device The body portion of the camera body 1 is moved forward, backward, up and down, left and right, and the like.

When the preparation for photographing is completed through the above process, the working distance between the eye of the patient and the ocular unit is precisely adjusted before photographing the cornea or the retina of the patient.

For example, as shown in FIG. 6, a body part of the ocular device includes an OCT unit for photographing an internal tomographic image of the eye, A camera is installed.

In addition, a mire ring light source for irradiating the eye cornea with measuring light in the form of a ring is provided in the form of a ring around the objective lens OL, which is arranged in a ring shape And is composed of a plurality of light emitting elements.

For example, as shown in FIG. 7, eight LEDs may be composed of a miating light source 50, and two of the LEDs 50b may include a lens, a pinhole Pin Hole, and Scatter are provided. Thus, an infinite light source that is parallel light is emitted, and the remaining six LEDs 50a emit a finite light source that is diffusion light.

A display and a controller for displaying a tomographic image of a cornea or a retina and a camera image may be installed in a control box such as a personal computer or may be mounted on a body of the ocular device, As shown in FIG.

In the controller, the surface of the eye photographed by the camera is displayed on a base (Base) so that the ring by the finite light source and the point by the infinite light source coincide with each other. And controls the operation distance (WD) between the ocular unit and the eye.

8, the ocular device includes a photodetector 10, a plurality of lenses 11, 13, 20, 26 and 28, a diffraction grating 12, a light source 14, A coupler 15, and a reference mirror 16 may be included.

The collimator lens 17, the XY scanners 18 and 21, the adjusting lenses 19 and 30, the dichroic spectroscope 22, the cornea photographing lens 23, the objective lens 24, A black spot plate 27, a hole mirror 29, a camera lens 31, a CCD 32, and the like.

The light source 14 may be a frequency swept light source and the light emitted from the light source 14 is incident on the reference mirror 16 through the coupler 15 , And the light reflected by the reference mirror is incident on the photodetector 10 through the coupler 15.

On the other hand, light passing through the coupler 15 and the collimator lens 18 passes through the optical path of the XY scanner 18, 21, the dichroic spectroscope 22, and the objective lens 24, And the reflected light is incident on the photodetector 10 through an optical path opposite to the optical path incident on the eye.

8, the cornea photographing lens 23 is inserted between the dichroic spectroscope 22 and the objective lens 24, and then the retina photographing mode is selected. The illumination 25 is turned off and the miirring light source 50 is turned on.

9, on the surface image of the patient's eye, two infinite light sources 50 of the miaring light source 50 are displayed on the surface image of the patient's eye, Two points (Point) by the light source 50b and the circular ring by the six finite light sources 50a are superimposed and displayed.

In this case, the two points have a fixed distance d1 regardless of the working distance, and the diameter of the circular ring varies depending on the working distance, And the point by the infinite light source are displayed at positions where they coincide with each other.

Accordingly, the mechanism moves the body portion of the ocular device in the anteroposterior direction, thereby automatically adjusting the working distance between the ocular unit and the patient's eye.

The controller adjusts the mechanism so that the thickness d3 of the ring by the finite light source is minimized, for example, on the surface image of the eye photographed by the camera, as shown in Fig. 10 .

Accordingly, the mechanism moves the body part of the ocular device in the anteroposterior direction, and the focus between the ocular unit and the patient's eye can be automatically adjusted.

Further, the controller may be, for example, as shown in Fig. In the surface image of the eye photographed by the camera, the mechanism is adjusted so that the center (p2) of the ring by the finite light source coincides with the center (p1) of the pupil of the eye.

Accordingly, the mechanism can automatically adjust the centering between the ocular unit and the patient's eye by moving the body portion of the ocular device in the up, down, left, and right directions.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. , Alteration, substitution, addition, or the like.

10: Photo detector 11, 13, 20, 26, 28:
12: diffraction grating 14: light source
15: coupler 16: reference mirror
17: Collimate lens 18,21: XY scanner
19,30: Adjustment lens 22: Dichroic spectroscope
23: cornea photographing lens 24: objective lens
25: Retina photographing light 27: Black spot plate
29: Hall mirror 31: Camera lens
32: Ccd 50: Myearing light source
50a: Finite light source 50b: Infinite light source

Claims (6)

An ocular unit for imaging an internal tomographic image of the eye;
A camera for photographing a surface image of an eye;
A miirring light source for irradiating a ring-shaped measurement light to the cornea of the eye; And
And a controller for adjusting a working distance between the ocular unit and the eye. The method according to claim 1,
The Meiering light source includes a plurality of light emitting elements arranged in a ring shape,
Wherein at least two light emitting elements among the plurality of light emitting elements are infinite light sources and the remaining light emitting elements are finite light sources. 3. The method of claim 2,
The controller adjusts a working distance between the ocular unit and the eye so that the ring of the finite light source and the point of the infinite light source coincide with each other on the surface image of the eye photographed by the camera And a light source for emitting light. 3. The method of claim 2,
Wherein the controller adjusts the focus between the ocular unit and the eye such that the thickness of the ring by the finite light source is minimized in the surface image of the eye photographed by the camera Ociti device. 3. The method of claim 2,
The controller controls the centering between the ocular unit and the eye such that the center of the ring of the finite light source coincides with the center of the pupil of the eye on the surface image of the eye photographed by the camera And a miating light source. The method according to claim 1,
And a mechanism for moving the ocular unit,
Wherein the mechanism is configured to move the ocular unit in the forward and backward directions to adjust the working distance or focus with the eyes or move the ocular unit in the up and down and left and right directions to adjust the centering with the eye Ociti device.

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