WO2017095124A1

WO2017095124A1 - Method and device for generating cross section image of tooth pair, and recording medium in which same is recorded

Info

Publication number: WO2017095124A1
Application number: PCT/KR2016/013931
Authority: WO
Inventors: 정정운
Original assignee: 오스템임플란트 주식회사
Priority date: 2015-11-30
Filing date: 2016-11-30
Publication date: 2017-06-08
Also published as: KR101692250B1

Abstract

The present invention relates to a method and a device for generating a cross section image of a tooth pair, and a recording medium in which the same is recorded. The method for generating a cross section image of a tooth pair, according to the present invention, generates the cross section image of a tooth pair by using a transverse section line, which is frequently used in dental diagnosis as a standard for the generation of a transverse section image of a maxillary bone. Therefore, a user's input is minimized such that convenience is improved and the image can be quickly generated.

Description

[Correction 03.02.2017] according to Rule 26. Method, apparatus, and recording medium recording the tooth-pair cross-sectional image

The present invention relates to a method, apparatus, and a recording medium for generating a tooth-pair cross-sectional image, and more particularly, to a method, apparatus, and a recording medium for generating a tooth-pair cross-sectional image by reconstructing a CT image.

Recently, in the dental field, lesions that are difficult to diagnose through two-dimensional images such as X-rays and panoramic images can be treated more precisely and satisfactorily by using three-dimensional images reconstructed by CT (computed tomography). have.

CT images are reconstructed and utilized as appropriate by using appropriate techniques. For example, the tooth pair cross-sectional image shown in FIG. 1 may be used. The cross-sectional image of the tooth pair is used to establish the treatment plan for orthodontics because it can grasp the occlusal state and the asymmetry of the tooth along with the position of the net / span cortical plate of the alveolar bone.

Multi planar reformation (MPR) is one of the CT reconstruction techniques, which generates a cross-sectional image along one plane. As shown in FIG. 1, a pair of teeth cannot be represented on a single image. A pair of curved planar reformation (CPR) techniques are used to visualize a pair of teeth within an image.

Looking at the generation of a single tooth pair cross-sectional image in the conventional 3D viewer (viewer), in the axial cross section (axial) image in the right and left of the curve (curve) start point and end point 4 points received from the user, respectively Tooth-section cross-sectional images are generated by curve reconstruction using the curves generated based on four points.

According to this, since four points must be input when one image is generated, more inputs are required to generate an image of the entire tooth. For example, suppose that tooth pair cross-sectional images are generated for central incisor, lateral incisor, canine, first and second premolar, and first and second molar, respectively. At that time, the user must enter a total of 28 points.

According to the prior art as described above, there is a problem that is very cumbersome and time-consuming because the user has to enter a number of points to generate the tooth pair cross-sectional image.

Therefore, there is a need for an effective image generation method that can minimize the user's work and shorten the time when generating the tooth pair cross-sectional image.

The present invention has been proposed to solve the problem of the prior art that requires a lot of input to the user when generating the tooth pair cross-sectional image, and takes a long time to generate an image, an image that can conveniently generate a tooth pair cross-sectional image It is an object to provide a production method, an apparatus, and a recording medium.

The above object is a method for generating a tooth pair cross-sectional image by reconstructing a tomography image in accordance with an aspect of the present invention, comprising: generating a panoramic curve for generating a tooth panoramic image on the arch; Creating a plurality of cross-sectional lines perpendicular to the panoramic curve; Receiving a tooth pair to generate a tooth pair cross-sectional image through a user input unit; And a first cross section line, a second cross section line, and a lingual straight line connecting the first cross section line and the second cross section line, respectively, passing through two teeth constituting the tooth pair among the plurality of cross section lines. It can be achieved by a tooth pair cross-sectional image generation method comprising the step of generating a tooth pair cross-sectional image based on the cross section.

The generating of the tooth pair cross-sectional image may include: generating a curved surface based on the first cross section line, the second cross section line, and the lingual straight line; And generating a curved multiplanar reformation image based on the curved surface.

Alternatively, the generating of the tooth pair cross-sectional image may be generated by combining the cross-sectional image along the first cross section line, the second cross section line, and the lingual line.

On the other hand, the above object can also be attained by a computer-readable recording medium having recorded thereon a program for executing the above-described tooth pair cross-sectional image generating method.

In addition, the above object is a device for generating a tooth pair cross-sectional image by reconstructing a tomography image, comprising: a panorama curve generating unit for generating a panoramic curve (panorama line) for generating a tooth panorama image on the arch; A cross-sectional line generator for generating a plurality of cross-sectional lines perpendicular to the panoramic curve; A user input unit for selecting a tooth pair to generate a tooth pair image; And a first cross section line, a second cross section line, and a lingual straight line connecting the first cross section line and the second cross section line, respectively, passing through two teeth constituting the tooth pair among the plurality of cross section lines. It may also be achieved by a tooth pair cross-sectional image generating device including an image generator for generating a tooth pair cross-sectional image based on the cross section.

The image generator may determine the first cross-sectional line and the second cross-sectional line, respectively, when the tooth pair is selected, the cross-sectional line nearest to the position and distance input through the user input unit.

The tooth pair cross-sectional image generating apparatus may further include an image corrector configured to correct an inclination of the tomography image, and the panorama curve generator may generate the panorama curve based on the corrected image.

In this case, the image corrector corrects the median sagittal line vertically in the axial image of the tomography image, and corrects the maxillary and mandible in the sagittal image of the tomography image. The occlusal surface may be corrected to be horizontal, and the intramarbital line (IOML) may be corrected to be horizontal in a coronal image of the tomography image.

As described above, according to the present invention, convenience is increased by minimizing a user's input, and there is an effect of quickly generating a tooth pair cross-sectional image.

1 is an example of a tooth pair cross-sectional image;

2 is a block diagram of a tooth pair cross-sectional image generating device according to an embodiment of the present invention;

3 is a reference diagram for explaining a panoramic curve and a cross-sectional line;

4 is an example of a tooth pair section image according to whether the image is tilted;

5 is a reference diagram for explaining an example of correcting an inclination of an image;

6 is a flowchart of a method for generating a tooth-pair cross-sectional image according to an embodiment of the present invention;

7 is a reference diagram for explaining an example of defining a cross section for generating a tooth pair cross-sectional image;

8 is an example in which a cross section for generating a tooth pair cross section image is defined for a plurality of tooth pairs;

9 is a reference diagram for explaining an example of a method of generating a tooth pair section image based on a defined section; And

10 is a reference diagram for explaining another example of a method of generating a tooth pair cross-sectional image based on a defined cross section.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in the following description and the accompanying drawings, detailed descriptions of well-known functions or configurations that may obscure the subject matter of the present invention will be omitted. In addition, it should be noted that like elements are denoted by the same reference numerals as much as possible throughout the drawings.

The terms or words used in the specification and claims described below should not be construed as being limited to ordinary or dictionary meanings, and the inventors are appropriate as concepts of terms for explaining their own invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical ideas of the present invention, and various alternatives may be substituted at the time of the present application. It should be understood that there may be equivalents and variations.

2 is a block diagram of a tooth pair cross-sectional image generating apparatus according to an embodiment of the present invention. Referring to FIG. 2, the tooth-pair cross-sectional image generating apparatus 100 according to an exemplary embodiment of the present invention includes a panoramic curve generator 10, a cross-sectional line generator 30, a user input unit 50, and an image generator 70. ) And an image correction unit 90.

The panoramic curve generator 10 generates a panoramic curve for generating a tooth panoramic image on the arch. For reference, the tooth panoramic image is an image widely used in dental diagnosis to observe the state of the entire tooth, and various techniques for generating the tooth panoramic image from the CT image have been introduced.

When generating the tooth panoramic image as described above, the process of generating a panoramic curve along the arch in the axial image by the multi-plane reformation (MPR) is involved. In this case, the panorama curve may be manually generated through a user input or automatically generated through image recognition.

The cross-sectional line generator 30 generates a plurality of cross-sectional lines perpendicular to the panoramic curve. The cross-sectional lines are used in conjunction with tooth panoramic images to produce jaw cross-section images that are widely used for dental diagnosis.

3 is a reference diagram for explaining a panoramic curve and a cross-sectional line.

The axial image A of the lower right of FIG. 3 shows a panorama curve and a cross-sectional line. The curve located along the arch is the panoramic curve 301, and the lines perpendicular to the panoramic curve 301 are the cross-sectional lines 305.

A panoramic image B as shown in the upper right corner is generated based on the panoramic curve 301 as described above, and a jawbone cross section image C as shown in the left screen is generated based on the cross section line 305.

As described above, the panoramic curve and the cross-sectional line is a line required to generate a panoramic image and jawbone cross-sectional image that is widely used for dental diagnosis, the panorama curve generator 10 automatically panoramas using various known panorama curve generation algorithms. A curve is generated or a panoramic curve is generated through a user input, and the cross-sectional line generator 30 derives cross-sectional lines perpendicular to the generated panoramic curve.

The user input unit 50 receives a tooth pair to generate a tooth pair cross-sectional image from the user. The user input may be performed by selecting a dot on a tooth to generate a tooth pair cross-sectional image from an image including a shaft cross-sectional image. In this case, when the user wants to generate a plurality of tooth pair cross-sectional images, the user may be configured to receive a plurality of tooth pairs at a time.

The image generator 70 defines a cross section for generating a tooth pair cross section image, and generates an image based on the cross section. The image generating unit 70 includes two cross-sectional lines passing through two teeth constituting the pair of teeth input through the user input unit 50 among a plurality of cross-sectional lines, and a lingual straight line which is a horizontal line connecting the two cross-sectional lines to each other at the lingual side. A tooth pair section image is generated based on the section defined as the basis.

In this case, the image generator 70 may select a cross-sectional line of a distance closest to a point on two teeth constituting the pair of teeth input through the user input unit 50, respectively.

On the other hand, the tooth pair section generating apparatus 100 according to an embodiment of the present invention may further include an image correction unit 90 for correcting the inclination of the image.

Figure 4 shows an example of the tooth pair cross-sectional image according to whether the image is tilted. Referring to FIG. 4, (a) is a tooth pair cross-sectional image generated by applying an inclined image in which the patient's posture is misaligned, and (b) is a tooth pair cross-sectional image generated by applying an image in which the inclination is corrected.

According to (a), it is difficult to accurately evaluate the orthodontic state because the tooth pair cross-sectional image is inclined, (b) it can be seen that the cross-section of the tooth pair is located horizontally to easily determine the occlusal state or symmetry.

The image corrector 90 corrects the tilt of the image in the axial, sagittal, and coronal images, respectively.

5 is a reference diagram for describing an example of correcting an inclination of an image.

Referring to FIG. 5, the image corrector 90 corrects an IOML (Infraorbitomeatal line) I to be horizontal in the coronal plane image 501 of the tomography image, and adjusts a posture tilted left / right with respect to the front of the patient. In the axial cross-sectional image 503, the median sagittal line M may be corrected so that the median sagittal line M is vertical to correct the rotated state to the left and right with respect to the front of the patient. In addition, in the sagittal image 505, the upper and lower occlusal occlusal surfaces o may be corrected to be horizontal, thereby correcting a posture tilted up or bowed down based on the front of the patient.

Since the reference line of FIG. 5 is an example, the present invention is not limited thereto, and the inclination may be automatically corrected based on the reference line provided according to each cross-sectional image, or the inclination is corrected in response to the input through the user input unit 50. You could do it.

6 is a flowchart illustrating a method of generating a tooth pair cross-sectional image according to an exemplary embodiment of the present invention, and FIGS. 7 to 10 are views for explaining an example according to each process of the method for generating a tooth pair cross-sectional image. Hereinafter, the operation of the above-described tooth-pair cross-sectional image generating apparatus 100 will be described with reference to FIGS. 6 and 7 to 10.

First, referring to FIG. 6, it is assumed that a panorama curve drawn along a arch line for generating a panorama image and a cross section line perpendicular to the panorama curve are generated (S10 and S20). Since the panorama curve and the cross-sectional line generation are functions provided by the conventional 3D viewer that processes the tooth image, the panorama curve generator 10 and the cross-sectional line generator 30 use the known curves and cross-sections, respectively. The ability to generate lines is as described above.

Thereafter, a tooth pair for generating a tooth pair cross-sectional image is received through the user input unit 50 (S30). The user can select a dot on the tooth in the image where the tooth appears.

When the tooth pair selection is completed, the image generating unit 70 is a cross-sectional line passing through each of the two selected teeth, based on two lateral lines that are closest in distance to the input point and a lingual straight line connecting the two cross-sectional lines to each other in the lingual side. A cross section is defined (S40). Here, the lingual means the inward direction of the teeth to which the tongue touches.

7 is a reference diagram for describing an example of defining a cross section for generating a tooth pair cross-sectional image. Referring to FIG. 7, as an example, when the user selects the molar teeth m1 and m2 as tooth pairs for generating tooth pair cross-sectional images, three straight lines for defining a cross section are shown.

The image generating unit 70 uses the first cross section line s1 as the first cross section line s1, and the cross section line closest in distance to the input point on the molar m2 among the plurality of cross sections. Is selected as the second cross section line s2.

At this time, the length of the first cross-sectional line (s1) and the second cross-sectional line (s2) is determined to extend a predetermined length from the buccal border (a1, a2) and lingual border (b1, b2) of the selected tooth. At this time, the extended length grasps the buccal border (a1, a2) and lingual border (b1, b2) of the teeth through the image recognition and give a predetermined length from the identified boundary line or collectively set a predetermined length for each tooth It may be applicable. For reference, the buccal refers to the direction opposite to the above-described lingual means the direction of contact with the face, not the tongue side.

Next, the horizontal line in the lingual direction connecting the first cross-sectional line s1 and the second cross-sectional line s2 to each other is set as the lingual straight line l. The lingual straight line l may be determined as a line connecting the end points p1 and p2 of the lingual direction of the first cross-sectional line s1 and the second cross-sectional line s2 with each other.

8 illustrates an example in which a cross section for generating a tooth pair cross-sectional image is defined for a plurality of tooth pairs by the above-described method.

Referring to FIG. 8, two transverse lines and a lingual straight line are formed for four tooth pairs, respectively, in the

middle incisors

701 and 703, the

incisors

705 and 707, the

canines

709 and 711, and the

first molar

713 and 715. It can be seen that the

cross sections

1, 2, 3 and 4 are defined.

When a plurality of pairs of teeth are input from the user input unit 50, cross sections defined for the plurality of pairs of teeth input as shown in FIG. 8 may be collectively shown.

When the cross section is defined as above, the image generator 70 generates a tooth pair cross section image based on the defined cross section (S50).

9 and 10 are reference diagrams for explaining an example of a method of generating a tooth pair cross-sectional image based on a defined cross section.

Referring to FIG. 9, a cross section defined primarily based on the first cross-sectional line s1, the second cross-sectional line s2, and the lingual straight line l derived in the above-described steps as illustrated in FIG. 9A. A surface C may be generated based on the C, and a tooth pair cross-sectional image as shown in FIG. 9B may be generated using a curved multiplanar reformation technique based on the surface C. FIG.

As another example of generating a tooth pair cross-sectional image, referring to FIG. 10, a first cross-sectional line s1, a second cross-sectional line s2, and a lingual straight line constituting a cross section defined as shown in FIG. 10 (a). A cross-sectional image along three straight lines of (l) may be combined with each other to generate a tooth pair cross-sectional image. FIG. 10 (b) is a tooth pair cross-sectional image generated by combining a cross-sectional image, in which a region is a first cross section line s1, a c region is a second cross section line s2, and b is a lingual straight line l ) Corresponds to the cross-sectional image.

9 (b) and 10 (b) have been generated in different ways as described above, but since the tooth symmetry and occlusal state are not different, both images are useful for diagnosis. Can be.

The above-described steps may be applied as appropriately added or modified as necessary. As an example, the tilt of the image may be corrected first in the axial, sagittal, and coronal cross-sectional images, and a series of steps such as generating a panoramic curve and a cross-sectional line may be performed.

Meanwhile, the tooth pair cross-sectional image generating method according to the present invention may be implemented as a program that can be executed in a computer, and may be implemented as various recording media such as a magnetic storage medium, an optical reading medium, and a digital storage medium.

As can be seen from the above description, according to the tooth pair cross-sectional image generating apparatus 100, the method, and the recording medium according to the embodiment of the present invention, the tooth pair cross-sectional image is conventionally utilized by utilizing a panoramic curve and a cross-sectional line perpendicular thereto. Convenience can be effectively increased by reducing the user input required during creation.

Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or in combinations of them. Implementations may be implemented for processing by, or to control the operation of, a data processing device, eg, a programmable processor, a computer, or multiple computers, a computer program product, ie an information carrier, for example a machine readable storage. It can be implemented as a device (computer readable medium) or as a computer program tangibly embodied in a radio signal. Computer programs, such as the computer program (s) described above, may be written in any form of programming language, including compiled or interpreted languages, and may be written as standalone programs or in modules, components, subroutines, or computing environments. It can be deployed in any form, including as other units suitable for use. The computer program can be deployed to be processed on one computer or multiple computers at one site or distributed across multiple sites and interconnected by a communication network.

Processors suitable for the processing of a computer program include, by way of example, both general purpose and special purpose microprocessors, and any one or more processors of any kind of digital computer. In general, a processor will receive instructions and data from a read only memory or a random access memory or both. Elements of a computer may include at least one processor that executes instructions and one or more memory devices that store instructions and data. In general, a computer may include one or more mass storage devices that store data, such as magnetic, magneto-optical disks, or optical disks, or receive data from, transmit data to, or both. It may be combined to be. Information carriers suitable for embodying computer program instructions and data include, for example, semiconductor memory devices, for example, magnetic media such as hard disks, floppy disks, and magnetic tape, compact disk read only memory. ), Optical media such as DVD (Digital Video Disk), magneto-optical media such as floppy disk, ROM (Read Only Memory), RAM , Random Access Memory, Flash Memory, Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), and the like. The processor and memory may be supplemented by or included by special purpose logic circuitry.

Although the specification includes numerous specific implementation details, these should not be construed as limiting to any invention or the scope of the claims, but rather as a description of features that may be specific to a particular embodiment of a particular invention. It must be understood. Certain features that are described in this specification in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable subcombination. Furthermore, while the features may operate in a particular combination and may be initially depicted as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, the claimed combination being a subcombination Or a combination of subcombinations.

Likewise, although the operations are depicted in the drawings in a specific order, it should not be understood that such operations must be performed in the specific order or sequential order shown in order to obtain desirable results or that all illustrated operations must be performed. In certain cases, multitasking and parallel processing may be advantageous. Moreover, the separation of the various device components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and devices will generally be integrated together into a single software product or packaged into multiple software products. It should be understood that it can.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples for clarity and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

Claims

In the method for generating a tooth pair cross-sectional image by reconstructing a tomography image,

Generating a panorama line for generating a tooth panoramic image on the arch;

Creating a plurality of cross-sectional lines perpendicular to the panoramic curve;

Receiving a tooth pair to generate a tooth pair cross-sectional image through a user input unit; And

A cross section defined by a first cross section line, a second cross section line, and a lingual straight line connecting the first cross section line and the second cross section line, respectively, passing through two teeth constituting the pair of teeth among the plurality of cross section lines; Tooth pair cross-sectional image generation method comprising the step of generating a tooth pair cross-sectional image on the basis.
The method of claim 1,

Generating the tooth pair cross-sectional image,

Generating a curved surface based on the first cross section line, the second cross section line and the lingual straight line; And

Generating a curved multiplanar reformation image based on the curved surface.
The method of claim 1,

Generating the tooth pair cross-sectional image,

Tooth pair cross-sectional image generation method for combining the cross-sectional image along the first cross-sectional line, the second cross-sectional line and the lingual line is generated.
A computer-readable recording medium having recorded thereon a program for executing the method for generating a tooth-pair cross-sectional image according to any one of claims 1 to 3.
An apparatus for generating a tooth pair cross-sectional image by reconstructing a tomography image,

A panoramic curve generating unit generating a panoramic curve for generating a tooth panoramic image on the arch;

A cross-sectional line generator for generating a plurality of cross-sectional lines perpendicular to the panoramic curve;

A user input unit for selecting a tooth pair to generate a tooth pair image; And

A cross section defined by a first cross section line, a second cross section line, and a lingual straight line connecting the first cross section line and the second cross section line, respectively, passing through two teeth constituting the pair of teeth among the plurality of cross section lines; Tooth pair cross-sectional image generating device comprising an image generating unit for generating a tooth pair cross-sectional image based on the.
The method of claim 5,

The image generator,

And a tooth cross section image generating device for determining the first and second cross-sectional lines that are closest in distance to the position input through the user input unit when selecting the pair of teeth.
The method of claim 5,

Further comprising an image correction unit for correcting the tilt of the tomography image,

And the panoramic curve generator generates the panoramic curve based on the corrected image.
The method of claim 7, wherein

The image correction unit,

Tooth pair cross-sectional image generating device for correcting the median sagittal line vertical in the axial image of the tomography image.
The method of claim 7, wherein

The image correction unit,

Tooth pair cross-sectional image generating device for correcting the upper and lower occlusal occlusal surface in the sagittal image of the tomography image.
The method of claim 7, wherein

The image correction unit,

And a tooth pair cross-sectional image generating device for correcting an IOML (infraorbitomeatal line) to be horizontal in a coronal image of the tomography image.