CN111436895A - Oral cavity imaging detection system - Google Patents
Oral cavity imaging detection system Download PDFInfo
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- CN111436895A CN111436895A CN202010258683.6A CN202010258683A CN111436895A CN 111436895 A CN111436895 A CN 111436895A CN 202010258683 A CN202010258683 A CN 202010258683A CN 111436895 A CN111436895 A CN 111436895A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/24—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor for the mouth, i.e. stomatoscopes, e.g. with tongue depressors; Instruments for opening or keeping open the mouth
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0066—Optical coherence imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0088—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for oral or dental tissue
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- Optics & Photonics (AREA)
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- Oral & Maxillofacial Surgery (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses an oral cavity imaging detection system which 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, light beams output by the sweep frequency light source are split by the first optical fiber coupler to form sample arm light beams and reference arm light beams, returned sample arm light beams and reference arm light beams are combined by the first optical fiber coupler to form coherent light beams, and the coherent light beams are transmitted to the 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
Technical Field
The invention relates to the technical field of OCT imaging, in particular to an oral imaging detection 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.
Disclosure of Invention
The present invention is directed to an oral imaging detection system that solves one or more of the problems set forth in the prior art and provides at least one useful alternative or creation.
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 invention has the beneficial effects 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 invention is further described with reference to the accompanying drawings and examples;
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a schematic diagram of a sample arm configuration 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
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, 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 described, the meaning is one or more, the meaning of a plurality is two or more, more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
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.
In addition, the optical path difference between the reference arm beam and the sample arm beam is generated by the change of the optical path of the reference arm beam in the optical delay line module, and after simulation calculation, the relation 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: DEG) of the motor is as follows, wherein L is 0.75 theta, and theta ∈ [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 illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (7)
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.
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| CN202010258683.6A CN111436895A (en) | 2020-04-03 | 2020-04-03 | Oral cavity imaging detection system |
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| CN202010258683.6A CN111436895A (en) | 2020-04-03 | 2020-04-03 | Oral cavity imaging detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115989990A (en) * | 2023-03-24 | 2023-04-21 | 之江实验室 | Optical coherence tomography endoscopic imaging system based on planar optical waveguide technology |
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2020
- 2020-04-03 CN CN202010258683.6A patent/CN111436895A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115989990A (en) * | 2023-03-24 | 2023-04-21 | 之江实验室 | Optical coherence tomography endoscopic imaging system based on planar optical waveguide technology |
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