Method for judging face asymmetry, storage medium, equipment and system

Abstract

The invention provides a method, a storage medium, equipment and a system for judging facial asymmetry. The method comprises the following steps: acquiring a panoramic film of a maxillofacial region of a judged person; determining a plurality of mark points and reference lines on the panorama; measuring the distance between the specified mark points and the distance between the specified mark points and the specified reference line; and judging the asymmetry degree of the face according to the distance. The system comprises all the elements adopting the method. The device and the readable storage medium store a program product for executing the method. According to the method, the facial asymmetry condition of the patient can be simply and quickly judged at low cost.

Description

Technical Field

[0001] The present application belongs to the field of image analysis technology, and specifically relates to a method, storage medium, device and system for judging facial asymmetry. Background Art

[0002] Facial asymmetry is common in the population, and the assessment of facial asymmetry is a key task in orthodontics. Different research results have revealed that facial asymmetry may be caused by many factors, including the influence of facial soft tissue, maxillary and maxillary bones, alveolar bones, and the three-dimensional dimensions of teeth. The incidence of facial asymmetry in the population can be as high as 85%, and approximately 74% of the orthodontic population have various mandibular asymmetry factors. Clinically, asymmetry is usually defined as a chin asymmetry of more than 2mm. Usually, when the chin asymmetry is more than 4mm, facial asymmetry is more obvious.

[0003] There are various methods for evaluating patients with facial asymmetry. 1. Facial interpretation method: Zhu Yujia et al. used a three-dimensional facial symmetry reference plane construction method based on weighted morphological analysis. 2. Research on face combined with dental arch model: Guo Congcong et al. believed that the midline of the dentition and the midline of the face are a clinical diagnostic indicator and correction target that orthodontists need to consider when formulating treatment plans. 3. MRI shooting method: It has good imaging of soft tissues, but poor imaging effect on bone tissues, and high cost. It is generally not used as a routine method for judging facial asymmetry. 4. X-ray measurement method: X-ray measurement method or various methods derived from X-ray measurement method provide a more accurate basis for qualitative and quantitative measurement of facial asymmetry, but each has its own advantages and disadvantages. 5. Various three-dimensional measurement methods based on CBCT. 6. Radioactive bone nuclide imaging method: By reflecting the blood flow and metabolism of local bone joints, lesions can be detected early; but it has strong specificity, cannot display tissues outside the target organ, and the surrounding structure of the lesion is not clear and cannot be accurately located. It has not been widely used in clinical practice in China.

[0004] References: "Zhu Yujia, et al. Method for constructing three-dimensional facial symmetry reference plane based on weighted morphological analysis [J]. Journal of Peking University (Medical Edition) 2021, 1(53): 220-226.", "Guo Congcong, et al. Aesthetic research progress on midline deviation of dentition [J]. International Journal of Stomatology, 2012, 39(3): 412-415.", "Cavalcanti MG, Haller JW, Vannier MW. Three-dimensional computed tomography landmark measurement incraniofacial surgical planning: experimental validation in vitro [J]. Journal of Oral and Maxillofacial Surgery, 1999, 57(6): 690-694.", "Shi Congchong, et al. SPECT-CT study on bilateral temporomandibular joint metabolism and morphological symmetry in adult patients with mandibular deviation [J]. Journal of Stomatology, 2015, 31(11): 1151-1153.", "Wen Bing, et al. 99 Tc m -MDP SPECT temporomandibular joint imaging for the diagnosis of condylar hypertrophy[J]. Chinese Journal of Nuclear Medicine and Molecular Imaging, 2012, 32(6):438-441. Summary of the invention

[0005] The main purpose of this application is to provide a method, storage medium, device and system for judging facial asymmetry, which can simply, quickly and at low cost judge the facial asymmetry of patients. To this end, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a method for determining facial asymmetry, comprising:

[0007] Obtain panoramic radiographs of the patient's maxillofacial region;

[0008] Determining a plurality of landmark points and reference lines on the panoramic image;

[0009] Measuring the distance between the designated marker points and the distance from the designated marker point to the designated reference line;

[0010] Determine the degree of facial asymmetry based on the above distance.

[0011] In at least one embodiment, the landmarks include: condylar apex Co, mandibular angle Go, sigmoid notch Sig, virtual midline Y of nasal septum and intersection Me' of mandibular edge. The reference line includes: horizontal lines X drawn from sigmoid notch Sig to both sides of the same side.

[0012] In at least one embodiment, the distance includes: the distance Co-Go from the condylar apex Co on the same side to the mandibular angle Go, the perpendicular distance Co-X from the condylar apex Co on the same side to the horizontal line X, and the distance Co-Me' from the two condylar apexes Co to the intersection point Me' of the mandibular edge.

[0013] In at least one embodiment, the virtual midline Y is a straight line connecting the center point of the comb CG and the midpoint of the bony anterior nasal spine ANS, or is a relative midline of the face.

[0014] In at least one embodiment, the distance is marked on the panoramic film with a connecting line, and the measurement result of the distance is also marked on the panoramic film.

[0015] In at least one embodiment, the method for determining the degree of asymmetry is to compare the difference of the same distance on both sides. The greater the sum of the differences of all distances, the greater the degree of asymmetry.

[0016] In a second aspect, the present application provides a system for judging facial asymmetry, which includes an imaging unit and a processing unit. The imaging unit is used to take a panoramic film of the maxillofacial region of the person being judged, and transmit the image data of the panoramic film to the processing unit. The processing unit is used to process the panoramic film as follows: determine multiple marker points and reference lines on the panoramic film; measure the distance between the designated marker points, and the distance from the designated marker point to the designated reference line; and judge the degree of facial asymmetry based on the above distances.

[0017] In a third aspect, the present application provides a computer device, including a memory and a processor, wherein the memory stores computer program instructions, and the computer program instructions are read by the processor and execute the above method when executed.

[0018] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program executes the above method when executed by a computer.

[0019] In a fifth aspect, the present application provides a computer program product, which executes the above method when run by a computer.

[0020] The present application provides at least the following beneficial effects: compared with the posterior-anterior head positioning radiograph and CBCT, the present application is more economical, convenient, simple and easy to use, easy to learn and master, easy to promote widely, and more convenient for doctors to judge. It can reduce the radiation side effects of patients needing to take posterior-anterior head positioning radiographs or CBCT when they visit the doctor, thereby reducing the need for medical institutions, especially grassroots oral medical institutions specializing in orthodontic treatment, to be equipped with complex and expensive equipment such as dental CT. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] One or more embodiments of the present application will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0022] Figure 1 A flowchart of a method for determining facial asymmetry provided in an embodiment of the present application;

[0023] Figure 2 for Figure 1 Schematic diagram of the method for marking in the panoramic film;

[0024] Figure 3 A structural block diagram of a system for determining facial asymmetry provided in an embodiment of the present application;

[0025] Figure 4 This is a structural block diagram of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] The present application will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0027] refer to Figure 1 and Figure 2 The method for determining facial asymmetry provided in the embodiment of the present application comprises the following steps:

[0028] S1. Obtain a panoramic radiograph of the maxillofacial region of the person being judged;

[0029] S2, determining a plurality of landmark points and reference lines on the panoramic image;

[0030] S3, measuring the distance between the designated marker points and the distance from the designated marker point to the designated reference line;

[0031] S4. Determine the degree of facial asymmetry based on the above distance.

[0032] In step S1, the panoramic film (PANORAMA), also known as a curved tomographic film, is a method of obtaining an image projection of the maxillofacial region by projecting rays perpendicular to the maxillofacial region. In addition to teeth, other maxillofacial structures can also be seen on the panoramic film, such as the maxillary sinus, piriform foramen, mandibular nerve canal, mental foramen, temporomandibular joint, etc., which are conducive to the calibration of landmarks and the drawing of reference lines. By taking panoramic films, the economic burden of patients can be reduced, radiation can be reduced, and relatively accurate qualitative judgments can be obtained without the need for high-end equipment and software such as CBCT, posterior-anterior head positioning instrument, and apical head positioning instrument, which has clinical significance for judging facial asymmetry and has good social and economic benefits.

[0033] In step S2, the landmarks include: condylar vertex Co, mandibular angle Go, sigmoid notch Sig, virtual midline Y of nasal septum and intersection Me' of mandibular edge. The reference lines include: horizontal lines X from sigmoid notch Sig to both sides of the same side (see Figure 2 The virtual midline Y is the straight line connecting the center point of the comb CG and the midpoint of the bony anterior nasal spine ANS (see Figure 2 ), or the relative midline of the face.

[0034] Specifically, among the landmarks involved, 1) Condylar apex (Co): the uppermost point of the condylar head. 2) Sigmoid notch (Sig): the lowest point of the sigmoid notch. 3) Mandibular angle (Go): the lowest intersection of the mandibular ramus and the mandibular angle. 4) Submental point (Me): the midpoint of the lower edge of the median joint. 5) The intersection of the midline of the nasal area and the mandibular chin (Me'). Since Me' is more centered than Me, the virtual midline Y uses Me' to mark it. 6) CG is the center point of the cockscomb. 7) Nasion (Na): the most anterior point of the nasofrontal suture. 8) ANS is the midpoint of the bony anterior nasal spine.

[0035] In step S3, the distance includes: the distance Co-Go from the condylar vertex Co on the same side to the mandibular angle Go, the distance Co-X from the condylar vertex Co on the same side to the vertical line of the horizontal line X, and the distance Co-Me' from the two condylar vertices Co to the intersection point Me' of the mandibular edge. The distance is marked on the panoramic film with a connecting line, and the measurement result of the distance is also marked on the panoramic film, so as to facilitate and intuitively view and quickly judge the degree of asymmetry manually.

[0036] By drawing line segments such as Co-Go, Co-X and Co-Me', that is, drawing vertical lines from the condylar apex on both sides to the mandibular angle point on the same side, the intersection of the virtual midline of the nasal septum area and the mandibular edge, and from the condylar apex on the same side to the horizontal line of the sigmoid notch of the condyle on the same side, three lines are formed on each side, and their lengths are measured, thus forming an "M"-shaped measurement method.

[0037] In step S4, the method for determining the degree of asymmetry is to compare the difference of the same distance on both sides. The greater the sum of the differences of all distances is, the greater the degree of asymmetry is.

[0038] In general, this method also has the following advantages:

[0039] 1. On panoramic films, the intersection of the virtual midline and the edge of the mandible, as well as the condylar apex, mandibular angle notch, nasal septum area, and condylar sigmoid notch are relatively more objective and clear, and the positioning is more accurate.

[0040] 2. By drawing a line similar to an "M" shape, the amount of data calculation and comparison is reduced, and the detection is simpler and more intuitive.

[0041] 3. It can better avoid or overcome the problem that when the vertical line between the coronal center and the upper edge of the orbit is used to measure and judge facial asymmetry in the posteroanterior position of the skull, the apex of the condyles on both sides easily overlaps with the zygomatic bones, and the fixed point is not easy to be clear and accurate, which leads to the inaccuracy of the entire related measurement data.

[0042] 4. The "M"-shaped measurement method is a method for judging facial asymmetry based on the mandibular resting jaw position. It comprehensively considers the influence of different factors such as the maxillofacial bones, soft tissues, and tooth positions on facial asymmetry. It also includes the relevant data of the intersection of the virtual midline of the condylar length (height), mandibular ramus, and mandibular body length relative to the nasal septum area and the mandibular edge. It is more in line with clinical practice and can better avoid or overcome the shortcomings of simply relying on the distance from the condylar apex to the center of the mandibular chin (the actual mandibular body length) and the condylar apex to the mandibular notch (mandibular ramus length) to judge the influence of the symmetry of the two sides of the mandible on facial asymmetry.

[0043] 5. Although there will be a certain degree of deformation when taking panoramic X-ray films, the vertical measurement is relatively accurate. After standardized shooting training, it can be as consistent as possible. Generally speaking, it does not affect the qualitative judgment of the accuracy of the measurement results of facial asymmetry in the mandibular resting jaw position.

[0044] Secondly, refer to Figure 3The present application provides a system 200 for judging facial asymmetry, which includes an imaging unit 210 and a processing unit 220. The imaging unit 210 is used to take a panoramic film of the maxillofacial region of the person being judged, and transmit the image data of the panoramic film to the processing unit 220. The processing unit 220 is used to process the panoramic film as follows: determine a plurality of marker points and reference lines on the panoramic film; measure the distances between the designated marker points, and the distances from the designated marker points to the designated reference lines; and judge the degree of facial asymmetry based on the above distances. Specifically, the imaging unit 210 can be a device or part with a shooting function, used for taking panoramic films. The processing unit 220 is a device or part with computing capabilities, used for processing graphic data to obtain a judgment result of the degree of asymmetry.

[0045] Finally, the present application also provides a computer device, a computer-readable storage medium, and a computer program product.

[0046] like Figure 4 As shown, the computer device 300 includes a memory 310 and a processor 320. The memory 310 stores a computer program, and the computer program is read by the processor 320 and executes the above method when it is run.

[0047] The computer-readable storage medium stores a computer program, and the computer program executes the above method when executed by a computer.

[0048] The computer program product executes the above method when it is executed by a computer.

[0049] The computer device described in the embodiment of the present application is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, servers, mainframe computers and other suitable computers. The computer device can also represent various forms of mobile devices, such as personal digital processing equipment, smart phones, wearable devices and other similar computing devices. However, based on the demand for stable and safe processing of large-scale data, the computer device should be suitable for desktop computers, workbenches, servers, mainframe computers and other forms. Further, the components shown in this article, their connections and relationships, and their functions are only examples, and are not intended to limit the implementation of the present application described and / or required herein. In addition to including a memory and a processor, the computer device can also include a display, etc., which are common components or devices in the art, and the types and models contained therein are conventional selections, and the application is not repeated here.

[0050] The computer-readable medium described in the embodiment of the present application may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, (but not limited to) an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by an instruction execution system, device or device or used in combination with it. In the present application, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, wherein a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0051] The computer program product described in the embodiments of the present application is stored in a specific readable storage medium and can be run by a computer device. The computer program product should not be limited to running on a certain operating system, and these operating systems include: Unix-like systems (such as Linux), Microsoft Windows systems, Apple macOS, Chrome OS, Android, etc. In addition, the programming language used by the computer program product should not be limited to a specific programming language, and these programming languages ​​include: C++, Java, Python, JavaScript, Go language, etc.

[0052] It should be understood that all the above embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above based on the concept of the present application should all be within the protection scope of the present application.

Claims

1. A method for determining facial asymmetry, characterized in that: include: Obtain panoramic radiographs of the patient's maxillofacial region; Determining a plurality of landmark points and reference lines on the panoramic image; Measuring the distance between the designated marker points and the distance from the designated marker point to the designated reference line; Determine the degree of facial asymmetry based on the above distance.

2. The method according to claim 1, characterized in that: The landmarks include: condylar vertex Co, mandibular angle point Go, sigmoid notch point Sig, intersection point Me' of virtual midline Y of nasal septum area and mandibular edge; The reference lines include: horizontal lines X drawn from the sigmoid notch point Sig to both sides of the same side.

3. The method according to claim 2, characterized in that The distances include: the distance Co-Go from the condylar apex Co on the same side to the mandibular angle Go, the distance Co-X from the condylar apex Co on the same side to the perpendicular line of the horizontal line X, and the distance Co-Me' from the two condylar apex Co to the intersection point Me' of the mandibular edge.

4. The method according to claim 2, characterized in that: The virtual midline Y is a straight line connecting the center point of the comb CG and the midpoint of the bony anterior nasal spine ANS, or is a relative midline of the face.

5. The method according to claim 3, characterized in that: The distance is marked on the panoramic film with a connecting line, and the measurement result of the distance is also marked on the panoramic film.

6. The method according to claim 1, characterized in that: The method for judging the degree of asymmetry is to compare the difference of the same distance on both sides. The greater the sum of the differences of all distances is, the greater the degree of asymmetry is.

7. A system for determining facial asymmetry, characterized in that: It comprises an imaging unit and a processing unit; the imaging unit is used to take a panoramic picture of the maxillofacial region of the person being judged, and transmit the picture data of the panoramic picture to the processing unit; the processing unit is used to process the panoramic picture as follows: determine a plurality of marking points and reference lines on the panoramic picture; measure the distances between the designated marking points, and the distances from the designated marking points to the designated reference lines; and judge the degree of facial asymmetry according to the above distances.

8. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the computer program is read and executed by the processor, the method according to any one of claims 1 to 6 is executed.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a computer, the method according to any one of claims 1 to 6 is executed.

10. A computer program product, characterized in that: When the computer program product is executed by a computer, the method according to any one of claims 1 to 6 is executed.

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