CN212394875U

CN212394875U - Oral cavity imaging detection system

Info

Publication number: CN212394875U
Application number: CN202020484772.8U
Authority: CN
Inventors: 叶崇; 秦嘉; 安林
Original assignee: Foshan University
Current assignee: GUANGDONG WEIREN MEDICAL TECHNOLOGY Co.,Ltd.
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2021-01-26
Anticipated expiration: 2030-04-03

Abstract

The utility model discloses an oral cavity formation of image detecting system, including optical coherence tomography device and camera imaging device, optical coherence tomography device is including the frequency sweep light source, first fiber coupler, the sample arm, refer to the arm, photoelectric detector, data acquisition card and host computer, the light beam of frequency sweep light source output carries out the beam splitting through first fiber coupler and forms sample arm light beam and reference arm light beam, the sample arm light beam and the reference arm light beam that return close through first fiber coupler and restraint formation coherent light beam, coherent light beam transmission to photoelectric detector. This technical scheme carries out OCT formation of image through optics coherent tomography device in order to realize carrying out the oral cavity inside, acquires the inside three-dimensional structure information of oral cavity when carrying out nondestructive test, is convenient for medical personnel through camera imaging device and carries out direct observation to the oral cavity is inside, and this technical scheme combines two kinds of imaging methods to combine together can acquire the inside information of sickening the oral cavity to the at utmost.

Description

Oral cavity imaging detection system

Technical Field

The utility model relates to an OCT imaging technology field, more specifically say and relate to an oral cavity formation of image detecting system.

Background

Most people in China have slight protection consciousness on teeth, and do not have the habit of regularly seeing dentists. The young people have no protection consciousness on tooth health and are often very contradictory even to the dentist, so that the decayed teeth are frequently generated. The middle-aged and the elderly people have more serious dental diseases due to the fact that teeth are naturally worn and lack of calcium and the like and no timely nursing and protecting measures are taken due to thin concept. For example, if the caries is not treated early, the caries can cause more serious dental diseases after being allowed to develop, which not only causes great pain to patients, but also needs more time and money to treat and repair the diseased teeth.

At present, oral cavity detection is mainly performed through the following steps: first visual inspection, by visual observation of the oral surface, but in practice visual observation of the oral cavity does not determine the oral lesion factors; second, artificial exploration, which damages tooth structure and easily penetrates bacteria into pits and crevices of teeth; a third fluorescence technique, which can detect bacteria on the tooth surface, but does not provide any information about the crystal structure of the tooth; fourth, X-ray radiation, which does not detect lesions on smooth or occlusal surfaces, provides only two-dimensional images.

As described above, the conventional oral cavity detection means has a major drawback in that three-dimensional structural information in the oral cavity cannot be obtained and the amount of information that can be obtained is too small. In addition, although three-dimensional structural information in the oral cavity is obtained, intuitive high-definition oral cavity surface information is also required to maximize the accuracy of oral cavity detection.

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to provide an oral imaging detection system to solve one or more technical problems existing in the prior art, and to provide at least one useful choice or creation condition.

The technical scheme adopted for solving the technical problems is as follows:

an oral cavity imaging detection system comprises an optical coherence tomography device and a camera imaging device, wherein the optical coherence tomography device comprises a sweep light source, a first optical fiber coupler, a sample arm, a reference arm, a photoelectric detector, a data acquisition card and an upper computer, the camera imaging device is arranged in the sample arm, a light beam output by the sweep light source is split by the first optical fiber coupler to form a sample arm light beam and a reference arm light beam, the sample arm light beam is transmitted to the sample arm, the reference arm light beam is transmitted to the reference arm, the returned sample arm light beam and the reference arm light beam are combined by the first optical fiber coupler to form a coherent light beam, the coherent light beam is transmitted to the photoelectric detector, and the photoelectric detector and the camera imaging device are respectively connected with the data acquisition card, the data acquisition card is connected with the upper computer.

As a further improvement of the above technical solution, the optical coherence tomography apparatus further includes a second fiber coupler and a third fiber coupler, the photodetector is a balanced detector, the light beam output by the swept-frequency light source sequentially passes through the second fiber coupler and the first fiber coupler, and is split by the first fiber coupler to form a reference arm light beam and a sample arm light beam, the returned sample arm light beam and the returned reference arm light beam are first combined by the first fiber coupler to form a coherent light beam, and are then split to form a first coherent light beam and a second coherent light beam, the first coherent light beam is transmitted to one input end of the balanced detector through the second fiber coupler, and the second coherent light beam is transmitted to the other input end of the balanced detector through the third fiber coupler, and the output end of the balance detector is connected with the data acquisition card.

As a further improvement of the above technical solution, the sample arm includes a housing, a two-dimensional vibrating mirror, a first reflecting mirror and a convex lens are provided in the housing, the camera imaging device is installed on the housing, an optical fiber input port and a light beam output port are provided on the housing, a sample arm light beam passes through the optical fiber input port and is transmitted to the inside of the housing, the sample arm light beam passes through the two-dimensional vibrating mirror and is transmitted to the first reflecting mirror, the sample arm light beam passes through the first reflecting mirror and is transmitted to the convex lens, the sample arm light beam passes through the convex lens and is transmitted to the light beam output port and is output to the outside of the housing, and the returned sample arm light beam returns to the optical fiber input port through an original transmission light path.

As a further improvement of the above technical solution, the camera imaging device includes a camera and an illumination light source, the first reflecting mirror is a dichroic mirror, the camera is disposed in the housing, the illumination light source outputs an illumination light beam, the returned illumination light beam enters the housing through the light beam output port, the illumination light beam is transmitted to the dichroic mirror and reaches the camera through the dichroic mirror, and the camera is connected to the data acquisition card.

As a further improvement of the above technical solution, the housing includes a handheld portion and a scanning portion, the handheld portion and the scanning portion are integrally formed, and the illumination light source and the light beam output port are both disposed in the scanning portion.

As a further improvement of the above technical solution, the reference arm includes a collimating mirror and an optical delay line module for adjusting an optical path of a reference arm beam, and the reference arm beam is transmitted to the optical delay line module through the collimating mirror.

As a further improvement of the above technical solution, the optical delay line module includes a glass block, a second reflecting mirror and a servo motor, the servo motor drives the glass block to rotate, the reference arm beam passing through the collimating mirror is transmitted to the glass block, the reference arm beam passes through the glass block and then is transmitted to the second reflecting mirror to be reflected, and the returned reference arm beam is transmitted to the first optical fiber coupler through an original optical path.

The utility model has the advantages that: this technical scheme carries out OCT formation of image through optics coherent tomography device in order to realize carrying out the oral cavity inside, acquires the inside three-dimensional structure information of oral cavity when carrying out nondestructive test, is convenient for medical personnel through camera imaging device and carries out direct observation to the oral cavity is inside, and this technical scheme combines two kinds of imaging methods to combine together can acquire the inside information of sickening the oral cavity to the at utmost.

Drawings

The present invention will be further explained with reference to the drawings and examples;

fig. 1 is a schematic diagram of the system structure of the present invention;

fig. 2 is a schematic diagram of a sample arm structure of the present invention;

fig. 3 is a schematic view of the reference arm structure of the present invention.

100. The optical fiber scanning device comprises a shell, a 110, a handheld part, a 120, a scanning part, a 130, an optical fiber input port, a 210, a two-dimensional galvanometer, a 220, a first reflector, a 230, a convex lens, a 310, a camera, a 320, an illumination light source, a 410, a glass block, a 420, a servo motor, a 430 and a support frame.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, if words such as "a plurality" are used, the meaning is one or more, the meaning of a plurality of words is two or more, and the meaning of more than, less than, more than, etc. is understood as not including the number, and the meaning of more than, less than, more than, etc. is understood as including the number.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

Referring to fig. 1 to 3, the application discloses an oral imaging detection system, a first embodiment of which includes an optical coherence tomography device and a camera imaging device, the optical coherence tomography device includes a swept-frequency light source, a first fiber coupler, a sample arm, a reference arm, a photodetector, a data acquisition card and an upper computer, the camera imaging device is installed in the sample arm, a light beam output by the swept-frequency light source is split by the first fiber coupler to form a sample arm light beam and a reference arm light beam, the sample arm light beam is transmitted to the sample arm, the reference arm light beam is transmitted to the reference arm, the returned sample arm light beam and the reference arm light beam are combined by the first fiber coupler to form a coherent light beam, the coherent light beam is transmitted to the photodetector, the photodetector and the camera imaging device are respectively connected with the data acquisition card, the data acquisition card is connected with the upper computer.

Specifically, this embodiment carries out OCT formation of image in order to realize carrying out the oral cavity inside through optical coherence tomography device, acquires the inside three-dimensional structure information of oral cavity when carrying out nondestructive test, is convenient for medical personnel through camera imaging device and carries out direct observation to the oral cavity is inside, and the present embodiment combines two kinds of imaging methods to combine together can acquire the inside information of sickening the oral cavity to the at utmost.

It should be noted that, in this embodiment, the frequency of the light beam output by the camera imaging device is different from the frequency of the light beam output by the optical coherence tomography device, so that the two light beams can be effectively prevented from interfering with each other.

Further, as a preferred implementation manner, in this embodiment, the optical coherence tomography apparatus further includes a second fiber coupler and a third fiber coupler, the photodetector is a balanced detector, the light beam output by the swept-frequency light source sequentially passes through the second fiber coupler and the first fiber coupler, and is split at the first fiber coupler to form a reference arm light beam and a sample arm light beam, the returned sample arm light beam and the returned reference arm light beam are first combined to form a coherent light beam through the first fiber coupler, and then are split to form a first coherent light beam and a second coherent light beam, the first coherent light beam is transmitted to one input end of the balanced detector through the second fiber coupler, and the second coherent light beam is transmitted to the other input end of the balanced detector through the third fiber coupler, and the output end of the balance detector is connected with the data acquisition card. In this embodiment, the photodetector is specifically a balanced detector, and by setting the balanced detector, noise interference is effectively reduced, and sensitivity of receiving optical signals of the system is improved.

Further as a preferred implementation manner, in this embodiment, the sample arm includes a housing 100, a two-dimensional galvanometer 210, a first reflector 220 and a convex lens 230 are disposed in the housing 100, the camera imaging device is mounted on the housing 100, an optical fiber input port 130 and a light beam output port are disposed on the housing 100, the sample arm light beam is transmitted to the inside of the housing 100 through the optical fiber input port 130, the sample arm light beam is transmitted to the first reflector 220 through the two-dimensional galvanometer 210, the sample arm light beam is transmitted to the convex lens 230 through the first reflector 220 by reflection, the sample arm light beam is transmitted to the light beam output port and output to the outside of the housing 100 through the convex lens 230, and the returned sample arm light beam returns to the optical fiber input port 130 through an original transmission light path. Wherein the two-dimensional galvanometer 210 is used to control the scanning process of the sample arm beam.

Further, in a preferred embodiment, the camera imaging device includes a camera 310 and an illumination light source 320, the first reflecting mirror 220 is a dichroic mirror, the camera 310 is disposed in the housing 100, the illumination light source 320 outputs an illumination light beam, the returned illumination light beam enters the housing 100 through the light beam output port, the illumination light beam is transmitted to the dichroic mirror and reaches the camera 310 through the dichroic mirror, and the camera 310 is connected to the data acquisition card. In this embodiment, the first reflecting mirror 220 is specifically a dichroic mirror, and is configured to almost completely transmit light with a certain wavelength and almost completely reflect light with other wavelengths. In addition, in this embodiment, the illumination light beam enters and exits the housing 100 through the light beam output port, so that the illumination light beam and the sample arm light beam share a common light path, which can save the installation space of related components to a certain extent, and reduce the design difficulty of the housing 100.

Further as a preferred embodiment, in this embodiment, the housing 100 is substantially in a gun-type structure, the housing 100 includes a handheld portion 110 and a scanning portion 120, the handheld portion 110 and the scanning portion 120 are integrally formed, and the illumination source 320 and the light beam output port are both disposed on the scanning portion 120, so that the housing 100 is relatively effectively fixed by a medical staff during oral cavity examination, so as to complete optical imaging examination of the interior of the oral cavity.

Further, in a preferred embodiment, in this embodiment, the reference arm includes a collimating mirror and an optical delay line module for adjusting an optical path of a reference arm beam, and the reference arm beam is transmitted to the optical delay line module through the collimating mirror. Specifically, in this embodiment, the optical delay line module includes a glass block 410, a support frame 430, a second reflecting mirror and a servo motor 420, the glass block 410 is in a cubic structure, a reflective film is disposed on one side surface of the glass block 410, the glass block 410 is fixed on the support frame 430, the servo motor 420 drives the glass block 410 to rotate through the support frame 430, the reference arm beam passing through the collimating mirror is transmitted to the glass block 410, the reference arm beam is transmitted to the second reflecting mirror to be reflected after passing through the glass block 410, and the returned reference arm beam is transmitted to the first optical fiber coupler through an original optical path. Since the refractive index of air is smaller than that of the glass block 410, the reference arm beam transmitted by the collimating mirror enters the glass block 410 at a certain incident angle, is refracted at the interface, enters the glass block 410, is reflected at the reflective film, is totally reflected at the other side of the glass block 410, is emitted outside the glass block 410, is reflected by the second reflecting mirror, is transmitted to the collimating mirror by the same optical path, and is further output from the reference arm. In addition, in this embodiment, the servo motor 420 is used to drive the glass block 410 to rotate around its central axis, so as to rapidly and smoothly change the optical path of the reference arm in the glass block 410.

Because the basic condition of the imaging of the optical coherence tomography device is that the optical paths of the reference arm beam and the sample arm beam are consistent and within the coherence length, the embodiment solves the problem of low-resolution imaging caused by optical path mismatch in the imaging environment of uneven oral cavity, and an optical delay line module is arranged; in addition, the optical path difference between the reference arm beam and the sample arm beam can be generated by changing the optical path of the reference arm beam in the optical delay line module, and the relationship between the optical path difference change (L, unit: mm) of the reference arm beam and the sample arm beam and the rotation angle (theta, unit: degree) of the motor is obtained through simulation calculation as follows: l is 0.75 x θ, θ ∈ [0, 40 ].

In this embodiment, the upper computer is connected with the servo motor 420, the servo motor 420 is provided with an angle sensor for detecting a rotation angle of the servo motor 420, and the angle sensor is connected with the upper computer to realize a closed-loop control function of the upper computer and the servo motor 420.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims

1. An oral imaging detection system, characterized by: comprises an optical coherence tomography device and a camera imaging device, wherein the optical coherence tomography device comprises a sweep frequency light source, a first optical fiber coupler, a sample arm, a reference arm, a photoelectric detector, a data acquisition card and an upper computer, the camera imaging device is arranged in the sample arm, the light beam output by the swept-frequency light source is split by the first fiber coupler to form a sample arm light beam and a reference arm light beam, the sample arm beam is transmitted to the sample arm, the reference arm beam is transmitted to the reference arm, the returned sample arm beam and the reference arm beam are combined to form a coherent beam through the first fiber coupler, the coherent light beam is transmitted to the photoelectric detector, the photoelectric detector and the camera imaging device are respectively connected with the data acquisition card, and the data acquisition card is connected with the upper computer.

2. The oral imaging detection system of claim 1, wherein: the optical coherence tomography device also comprises a second optical fiber coupler and a third optical fiber coupler, the photoelectric detector is a balance detector, the light beam output by the sweep frequency light source sequentially passes through the second optical fiber coupler and the first optical fiber coupler, splitting the beam at the first fiber coupler to form a reference arm beam and a sample arm beam, combining the returned sample arm beam and the returned reference arm beam through the first fiber coupler to form a coherent beam, splitting the beam to form a first coherent beam and a second coherent beam, the first coherent light beam is transmitted to an input end of the balanced detector through the second fiber coupler, and the second coherent light beam is transmitted to the other input end of the balance detector through the third optical fiber coupler, and the output end of the balance detector is connected with the data acquisition card.

3. The oral imaging detection system of claim 1 or 2, wherein: the sample arm comprises a shell (100), a two-dimensional galvanometer (210), a first reflector (220) and a convex lens (230) are arranged in the shell (100), the camera imaging device is arranged on the shell (100), an optical fiber input port (130) and a light beam output port are arranged on the shell (100), the sample arm beam is transmitted through the fiber input port (130) to the interior of the housing (100), the sample arm beam is transmitted through the two-dimensional galvanometer (210) to the first mirror (220), the sample arm beam is transmitted to the convex lens (230) through reflection of the first reflector (220), the sample arm light beam is transmitted to the light beam output port through the convex lens (230) and is output to the outside of the shell (100), and the returned sample arm light beam returns to the optical fiber input port (130) through an original transmission optical path.

4. The oral imaging detection system of claim 3, wherein: the camera imaging device comprises a camera (310) and an illumination light source (320), the first reflecting mirror (220) is a dichroic mirror, the camera (310) is arranged in the shell (100), the illumination light source (320) outputs an illumination light beam, the returned illumination light beam enters the shell (100) through the light beam output port, the illumination light beam is transmitted to the dichroic mirror and reaches the camera (310) through the dichroic mirror, and the camera (310) is connected with the data acquisition card.

5. The oral imaging detection system of claim 4, wherein: the shell (100) comprises a handheld portion (110) and a scanning portion (120), the handheld portion (110) and the scanning portion (120) are integrally formed, and the illumination light source (320) and the light beam output port are arranged on the scanning portion (120).

6. The oral imaging detection system of claim 1 or 2, wherein: the reference arm comprises a collimating mirror and an optical delay line module used for adjusting the optical path of the reference arm beam, and the reference arm beam is transmitted to the optical delay line module through the collimating mirror.

7. The oral imaging detection system of claim 6, wherein: the optical delay line module comprises a glass block (410), a second reflecting mirror and a servo motor (420), wherein the servo motor (420) drives the glass block (410) to rotate, the reference arm light beam passing through the collimating mirror is transmitted to the glass block (410), the reference arm light beam is transmitted to the second reflecting mirror to be reflected after passing through the glass block (410), and the returned reference arm light beam is transmitted to the first optical fiber coupler through an original optical path.