Data generation program, data generation method, data generation device, and x-ray imaging device

Abstract

To provide a technology to measure a tooth crown tooth root ratio easily and accurately.SOLUTION: A data generation program 100 causes an arithmetic device 11 to execute: a display step for displaying an oral cavity image showing the oral cavity including a biological tissue three-dimensionally in a display 20; a point setting step for setting a first point indicating an apex of a tooth crown part, a second point indicating an apex of an alveolar bone or a border of a tooth and a gum, and a third point indicating a root apex part in the oral cavity image on the basis of user input or machine learning; and a calculation step for calculating the ratio of a first distance between the first point and the second point, and a second distance between the second point and the third point.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to a data generating program, a data generating method, a data generating device, and an X-ray imaging device that generate image data for checking the state of biological tissue including teeth and gums. [Background technology]

[0002] Periodontal disease is an infectious inflammatory disease caused by periodontal pathogens. Periodontal disease includes diseases occurring in the periodontal tissues, which are composed of the gingiva, cementum, periodontal ligament, and alveolar bone, necrotizing periodontal disease, abscesses of periodontal tissues, periodontal-endodontic lesions, gingival recession (e.g., gingival recession), alveolar bone recession (e.g., alveolar bone recession), and occlusal trauma caused by strong or abnormal occlusal force. As periodontal disease progresses, gingival inflammation, tooth mobility, alveolar bone recession, and the like occur. As alveolar bone recession progresses, tooth placement becomes unstable, and there is a risk of the tooth falling out.

[0003] A method for measuring the crown-root ratio is used to evaluate the stability of teeth affected by periodontal disease. This method uses the ratio between the length of the root part of the tooth embedded in the alveolar bone and the length of the crown part of the tooth exposed from the alveolar bone as an index for evaluating the stability of the tooth. Conventionally, such measurement of the crown-root ratio is usually performed by combining an X-ray image test with a measurement of a periodontal pocket, etc. For example, Patent Document 1 discloses that an operator such as a dentist checks the condition of the teeth and gums by inserting a probe of a handpiece into a periodontal pocket and measuring the depth of the periodontal pocket. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-174693 Summary of the Invention [Problem to be solved by the invention]

[0005] In the method of testing for periodontal disease disclosed in Patent Document 1, since it is necessary to insert a probe into a periodontal pocket, the burden on the patient is large, and the result of the test for periodontal disease may vary depending on the skill of the operator who measures the depth of the periodontal pocket. Since the probe is inserted and removed from the periodontal pocket where pathogenic bacteria are present, if pathogenic bacteria enter a tooth with mild or no symptoms through the probe, there is a risk that the tooth will be infected with periodontal disease. In addition, the patient may experience pain or bleeding when measuring the depth of the periodontal pocket, and if bleeding occurs, pathogenic bacteria may enter the bloodstream. Furthermore, when measuring the depth of the periodontal pocket at multiple points for each tooth, the measurement time may be long. In addition, in measuring the crown-root ratio by X-ray imaging, it is only possible to observe the state of the tooth when viewed from the direction of incidence of the X-rays, and only an image superimposed on the direction of incidence of the X-rays can be obtained, so it is difficult to accurately measure the crown-root ratio.

[0006] The present disclosure has been made to solve such problems, and has an object to provide a technique that can measure the crown-root ratio easily and accurately. [Means for solving the problem]

[0007] According to an example of the present disclosure, a data generation program is provided for generating image data for checking the state of biological tissues including teeth and gums. The data generation program causes a computer to execute a display step of displaying an oral cavity image showing an oral cavity including biological tissues in three dimensions on a display, a point setting step of setting a first point indicating the crest of a tooth crown, a second point indicating the crest of an alveolar bone or a boundary between a tooth and gums, and a third point indicating an apex on the oral cavity image based on a user input or machine learning, and a calculation step of calculating a ratio between a first distance between the first point and the second point and a second distance between the second point and the third point.

[0008] According to an example of the present disclosure, there is provided a data generation method for generating image data for checking the state of biological tissues including teeth and gums. The data generation method includes, as a process executed by a computer, a display step of displaying an oral cavity image showing the oral cavity including biological tissues in three dimensions on a display, a point setting step of setting a first point indicating the crest of a crown of a tooth, a second point indicating the crest of an alveolar bone or a boundary between a tooth and gums, and a third point indicating an apex of a root on the oral cavity image based on a user input or machine learning, and a calculation step of calculating a ratio between a first distance between the first point and the second point and a second distance between the second point and the third point.

[0009] According to one example of the present disclosure, there is provided a data generating device for generating image data for checking the state of biological tissues including teeth and gums. The data generating device includes a display for displaying an image, an input device for receiving a user input, and a control device for controlling the display based on the user input. The control device displays an oral cavity image showing the oral cavity including the biological tissues in three dimensions on the display, and sets a first point indicating the top of the crown of the tooth, a second point indicating the top of the alveolar bone or the boundary between the tooth and gums, and a third point indicating the apex of the root on the oral cavity image based on the user input or machine learning, and calculates a ratio between a first distance between the first point and the second point and a second distance between the second point and the third point.

[0010] According to an example of the present disclosure, there is provided an X-ray imaging device that generates image data for checking the state of biological tissues including teeth and gums. The X-ray imaging device includes an imaging unit that images an oral cavity including teeth, a display that displays an image, an input device that accepts user input, and a control device that controls the display based on the user input. The control device displays an oral cavity image showing the oral cavity in three dimensions captured by the imaging unit on the display, and sets a first point indicating the top of the crown of the tooth, a second point indicating the top of the alveolar bone or the boundary between the tooth and gums, and a third point indicating the apex of the root on the oral cavity image based on the user input or machine learning, and calculates a ratio between a first distance between the first point and the second point and a second distance between the second point and the third point. Effect of the Invention

[0011] According to the present disclosure, a user can set a first point indicating the top of the crown, a second point indicating the top of the alveolar bone or the boundary between the tooth and gums, and a third point indicating the root apex on an image of the oral cavity displayed on a display, and obtain a ratio between a first distance between the first point and the second point and a second distance between the second point and the third point, thereby enabling the user to easily and accurately measure the crown-root ratio. [Brief description of the drawings]

[0012] [Figure 1] 1A and 1B are diagrams illustrating application examples of a data generating device according to an embodiment. [Diagram 2] 1 is a block diagram showing a configuration of a data generating device according to an embodiment; [Diagram 3] FIG. 13 is a diagram for explaining the measurement direction and setting of each plane for measuring the crown-root ratio. [Figure 4] FIG. 13 is a diagram for explaining an example of setting a crown-root ratio. [Diagram 5] FIG. 13 is a diagram for explaining an example of setting a crown-root ratio. [Figure 6] FIG. 13 is a diagram for explaining an example of setting a crown-root ratio. [Figure 7]11 is a diagram for explaining an example of a reference plane set in an oral cavity image. FIG. [Figure 8] 10 is a flowchart illustrating an example of a data generation process executed by a data generation device according to an embodiment. [Figure 9] FIG. 13 is a diagram illustrating an example of the use of a bounding box. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and the description thereof will not be repeated.

[0014] [Example of application] An application example of the data generating device 1 according to the embodiment will be described with reference to FIG. 1. FIG. 1 is a diagram showing an application example of the data generating device 1 according to the embodiment. In a preparation stage, a user of the data generating device 1 acquires three-dimensional data (optical scanner data) including position information of each point of a point cloud (multiple points) indicating the surface of the biological tissue including the teeth and gums in the oral cavity by scanning the oral cavity of a subject using a three-dimensional scanner (optical scanner) not shown. The three-dimensional data includes, as position information, coordinates (X, Y, Z) of each point indicating the surface of the biological tissue in predetermined X-axis, Y-axis, and Z-axis directions. Note that the directions in the above-mentioned position information may be, for example, the X-axis direction is the horizontal direction, the Y-axis direction is the vertical direction, and the Z-axis direction is the height direction. Furthermore, the three-dimensional data may include color information indicating the actual color of a portion (surface portion of the biological tissue) corresponding to each point of the point cloud (multiple points) indicating the surface of the biological tissue including the teeth and gums in the oral cavity.

[0015] "User" includes practitioners (such as doctors) or assistants (such as dental assistants, dental technicians, nurses, etc.) in various fields such as dentistry, oral surgery, orthopedics, plastic surgery, and cosmetic surgery. "Subject" includes patients of dentistry, oral surgery, orthopedics, plastic surgery, and cosmetic surgery. In the following, the expression "a user does ..." includes a user issuing an execution command and a device or program executing or operating a process.

[0016] The three-dimensional scanner is a so-called intraoral scanner capable of optically imaging the oral cavity of a subject by a confocal method, a triangulation method, or the like, and is capable of acquiring position information of each point of a cloud of points constituting the surface of a biological tissue (for example, teeth and gums in the oral cavity) that is a scan target placed in a certain coordinate space. Optically photographing and scanning the oral cavity is also called IOS (intraoral scan). A user can generate a rendering image (appearance image) showing the three-dimensional shape of the biological tissue by using three-dimensional data acquired by a three-dimensional scanner. A "rendering image" is an image generated by processing or editing certain data. For example, a user can generate a rendering image showing the biological tissue (a part of the biological tissue that can be shown by IOS data) seen from a specific viewpoint by processing or editing the three-dimensional data of the biological tissue acquired by a three-dimensional scanner. Furthermore, a user can generate multiple rendering images showing the biological tissue seen from multiple directions by changing the specific viewpoint in multiple directions. The rendering image may be a two-dimensional image. For example, the two-dimensional image may be an image in which image data is projected onto a projection plane on a coordinate calculation that intersects with the line of sight. For example, the rendering image may be generated as a three-dimensional image that can be viewed stereoscopically using a viewer such as general-purpose VR goggles.

[0017] In addition, the user can also obtain three-dimensional volume (voxel) data of hard tissue parts (bones, teeth, etc.) around the upper and lower jaws of the subject by photographing the upper and lower jaws of the subject using a CT (Computed Tomography) imaging device (not shown). The CT imaging device is an "X-ray imaging device" that performs CT imaging of the upper and lower jaws of the subject by rotating a transmitter and a receiver of X-rays, which is a type of radiation, around the face of the subject. The user can generate a rendering image (a tomographic image or an external image) showing the three-dimensional shape of the biological tissue by using the volume data of the biological tissue to be photographed obtained by the CT imaging device. For example, the user can generate a rendering image showing the biological tissue (a part of the biological tissue that can be shown by CT data) seen from a specified viewpoint by processing or editing the volume data of the biological tissue obtained by the CT imaging device. Furthermore, the user can generate multiple rendering images showing the biological tissue seen from multiple directions by changing the specified viewpoint in multiple directions. As in the case of IOS data, the rendering image may be a two-dimensional or three-dimensional image.

[0018] Hereinafter, the three-dimensional data including the position information of each point of the point cloud showing the surface of the biological tissue acquired by the three-dimensional scanner is also referred to as "IOS data", and the rendered image generated based on the IOS data is also referred to as "IOS image". In addition, the three-dimensional volume data acquired by the CT imaging device is also referred to as "CT data", and the rendered image generated based on the CT data is also referred to as "CT image". The IOS image can show the surface shape of the biological tissue to be scanned in great detail, but cannot show the internal structure (such as the alveolar bone and the root apex) that does not appear on the surface of the biological tissue. The CT image can show the hard tissue parts (such as bones and teeth) of the imaging subject in relatively high detail, but cannot show the soft tissue parts (such as skin and gums) in as much detail as the hard tissue parts.

[0019] A user can generate oral cavity image data by combining IOS data and CT data acquired for the same subject. Here, the IOS data and the CT data have different data formats. For this reason, for example, the user converts the data format of the IOS data into the data format of CT data, and uses both converted data to pattern match the three-dimensional shape of the surface of the biological tissue, thereby generating oral cavity image data by combining the IOS data and the CT data. The user may convert the data format of the CT data into the data format of the IOS data, and uses both converted data to pattern match the three-dimensional shape of the surface of the biological tissue, thereby generating oral cavity image data. Alternatively, the user may convert the data formats of the CT data and the IOS data into a common data format, and uses both converted data to pattern match the three-dimensional shape of the surface of the biological tissue, thereby generating oral cavity image data. How to process the data format may be determined on the program side.

[0020] A user can generate a rendering image (e.g., an oral cavity image shown in FIG. 1) showing two-dimensional biological tissue (a portion of biological tissue that can be shown by both IOS data and CT data) seen from a predetermined viewpoint by processing or editing the oral cavity image data. As shown in FIG. 1, the oral cavity image can show in three dimensions the surface shape of the biological tissue shown by the IOS data and the cross-sectional structure or appearance of the hard tissue portion (bones, teeth, etc.) shown by the CT data. When generating the oral cavity image, the user may adjust the brightness, contrast, transparency, etc. of each of the IOS data and the CT data as necessary.

[0021] The data generating device 1 may obtain IOS data from the three-dimensional scanner and CT data from the CT imaging device, and generate an oral cavity image using the obtained IOS data and CT data based on a user input. Alternatively, the data generating device 1 may obtain oral cavity image data generated by a user using another device from another device without obtaining the IOS data and the CT data.

[0022] In oral cavity images, the CT data shows the three-dimensional shapes of hard tissue parts such as the alveolar bone and root apex, while the IOS data can show the three-dimensional shapes of soft tissue parts such as the gums that cannot be shown by CT data. As a result, oral cavity images can show details of hard tissue parts such as the alveolar bone and root apex, along with soft tissue parts such as the gums that cannot be shown by CT data alone, by supplementing them with IOS data.

[0023] As shown in FIG. 1, the data generating device 1 displays an image of an oral cavity showing the inside of the oral cavity including biological tissues such as teeth and gums on a display 20. The data generating device 1 can display images of the oral cavity showing the oral cavity from various viewpoints on the display 20 by processing the image of the oral cavity displayed on the display 20 based on a user input. Furthermore, the data generating device 1 can calculate the crown-root ratio of a tooth specified by a user in the image of the oral cavity displayed on the display 20 and display the calculated crown-root ratio. This allows the user to easily and accurately measure the crown-root ratio of a desired tooth without the need to measure the depth of a periodontal pocket or measure the crown-root ratio by an X-ray image test.

[0024] When generating an oral cavity image using IOS data and CT data, the data generating device 1 may perform segmentation for each anatomical element shown in the oral cavity image. For example, the segmentation may be various, such as segmentation of each hard tissue and soft tissue, each maxillary hard tissue and mandibular hard tissue, each dentition and alveolar bone, each maxillary dentition and mandibular dentition, each multiple teeth, etc. For example, the data generating device 1 may recognize the areas of the maxillary dentition, the mandibular dentition, each tooth included in the maxillary dentition, and each tooth included in the mandibular dentition, which are divided by the user, based on a user input, and segment these parts to display them in the oral cavity image.

[0025] Alternatively, the data generating device 1 may automatically segment each part using AI (Artificial Intelligence) technology or the like without following user input. For example, the data generating device 1 may have an estimation model including a neural network for identifying the upper jaw dentition, the lower jaw dentition, and each of the multiple teeth shown in the oral cavity image based on the oral cavity image data. The estimation model is trained by machine learning to segment the upper jaw dentition, the lower jaw dentition, and each of the multiple teeth shown in the oral cavity image based on the input oral cavity image data using learning data that is a set of multiple oral cavity images and correct answer data indicating the area of ​​each segmented part shown in each of the multiple oral cavity images. By using such an estimation model, a user can input oral cavity image data to the data generating device 1 to obtain an oral cavity image showing each of the upper jaw dentition, the lower jaw dentition, and each of the multiple teeth segmented by the estimation model of the control device 10.

[0026] [Data generation device configuration] The configuration of the data generating device 1 according to the embodiment will be described with reference to Fig. 2. Fig. 2 is a block diagram showing the configuration of the data generating device 1 according to the embodiment. The data generating device 1 may be realized, for example, by a general-purpose computer or a dedicated computer.

[0027] As shown in FIG. 2, the data generating device 1 includes a control device 10, a display 20, and an input device 30.

[0028] The control device 10 comprises a computing device 11 , a memory 12 , a storage device 13 , a display interface 14 , an input device interface 15 , a storage medium interface 16 , and a communication device 17 .

[0029] The arithmetic device 11 is a computing entity (computer) that executes various processes by executing various programs. The arithmetic device 11 is composed of a processor such as a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a TPU (Tensor Processing Unit), or a GPU (Graphics Processing Unit). Note that a processor, which is an example of the arithmetic device 11, has a function of executing various processes by executing a program, but some or all of these functions may be implemented using a dedicated hardware circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The term "processor" is not limited to a processor in the narrow sense that executes processing in a stored program manner such as a CPU, an MPU, a TPU, or a GPU, but may include a hardwired circuit such as an ASIC or an FPGA. The arithmetic device 11 is not limited to a von Neumann type computer such as a CPU or a GPU, and may be composed of a non-von Neumann type computer such as a quantum computer or an optical computer. The arithmetic device 11 as described above can also be read as a processing circuitry that executes a predetermined process. The arithmetic device 11 may be configured as one chip or as multiple chips. Furthermore, the processor and related processing circuits may be configured as multiple computers interconnected by wire or wirelessly via a local area network or a wireless network. The processor and related processing circuits may be configured as a cloud computer that performs calculations remotely based on input data and outputs the results of the calculations to other devices at remote locations. The execution of various programs by the arithmetic device 11 is equivalent to the various programs causing the arithmetic device 11 to execute various processes.

[0030] The memory 12 includes a volatile storage area (for example, a working area) that temporarily stores program codes or work memory when the arithmetic unit 11 executes various programs. An example of the memory 12 is a volatile memory such as a dynamic random access memory (DRAM) or a static random access memory (SRAM), or a non-volatile memory such as a read only memory (ROM) or a flash memory.

[0031] The storage device 13 stores various programs or various data executed by the arithmetic device 11. The storage device 13 may be one or more non-transitory computer readable media, or may be one or more computer readable storage media. Examples of the storage device 13 include a hard disk drive (HDD) and a solid state drive (SSD).

[0032] The storage device 13 stores a data generation program 100. The data generation program 100 describes the contents of a data generation process for the arithmetic device 11 to calculate a crown-root ratio of a tooth and generate oral cavity image data indicating the calculated crown-root ratio.

[0033] The display interface 14 is an interface for connecting the display 20. The display interface 14 realizes input and output of data between the control device 10 and the display 20. For example, the control device 10 causes the display 20 to display an oral cavity image based on oral cavity image data via the display interface 14.

[0034] The input device interface 15 is an interface for connecting an input device 30 such as a keyboard 31 and a mouse 32. The input device interface 15 realizes input and output of data between the control device 10 and the input device 30. For example, a user can input a desired command via the input device interface 15 by using the input device 30 such as the keyboard 31 and the mouse 32, and can cause the control device 10 to generate and edit oral cavity image data based on the command. Note that the input by the user to the control device 10 using the input device 30, or the data (command) input by the user to the control device 10, is also referred to as a "user input."

[0035] The storage medium interface 16 reads various data stored in a storage medium 40 such as a removable disk, and writes various data to the storage medium 40. For example, the data generating device 1 may obtain the data generating program 100 from the storage medium 40 via the storage medium interface 16, or may write oral cavity image data indicating the crown-root ratio of the tooth to the storage medium 40 via the storage medium interface 16. The storage medium 40 may be one or more non-transitory computer readable media, or one or more computer readable storage media. The control device 10 may obtain IOS data, CT data, or data obtained by combining IOS data and CT data from the storage medium 40 via the storage medium interface 16.

[0036] The communication device 17 transmits and receives data to and from an external device via wired or wireless communication. For example, the control device 10 may receive the data generation program 100 from the external device via the communication device 17, or may transmit oral cavity image data indicating the crown-root ratio of the tooth to the external device via the communication device 17. The control device 10 may obtain IOS data, CT data, or data obtained by combining IOS data and CT data from the external device via the communication device 17.

[0037] [An example of measuring the crown-root ratio] An example of measurement of the crown-root ratio by the data generating device 1 will be described with reference to Fig. 3 to Fig. 7. Fig. 3 is a diagram for explaining the measurement direction and the setting of each plane for measuring the crown-root ratio. Note that the processing of the data generating device 1 described below is realized by the control device 10 (arithmetic device 11) of the data generating device 1 executing a data generating program 100.

[0038] FIG. 3 shows a longitudinal section of biological tissue including teeth and gums. As shown in FIG. 3, the data generating device 1 sets a measurement direction for each tooth in an oral cavity image showing biological tissue including teeth and gums according to a predetermined criterion. For example, while viewing the oral cavity image, the user uses the input device 30 to specify a tooth axis indicating the inclination of the tooth as a predetermined criterion for each tooth to the data generating device 1. The data generating device 1 sets a measurement direction along the direction of the tooth axis specified by the user based on the user input. Note that the user may specify a direction other than the tooth axis direction as a predetermined criterion to the data generating device 1. In this case, the data generating device 1 sets a measurement direction along a direction other than the tooth axis direction specified by the user.

[0039] After setting the measurement direction, the data generating device 1 sets a plurality of planes at different heights along the measurement direction based on a user input. For example, while viewing the intraoral image, the user uses the input device 30 to specify a plurality of planes along the measurement direction for each tooth to the data generating device 1. The data generating device 1 sets a plurality of planes specified by the user based on the user input. The above-mentioned plurality of planes include a crown top surface, an alveolar bone top surface, a gingival boundary surface, and an apical surface, which are perpendicular to the tooth axis. Images obtained by segmenting individual teeth may be used as images of teeth shown in the intraoral image.

[0040] The crown top surface is an example of a "first plane" that passes through the position (e.g., height) of the apex of the crown in the measurement direction. The data generating device 1 can set a point indicating the apex of the crown on the first plane (an example of a "first point") based on a user input. For example, while viewing an intraoral image, the user uses the input device 30 to specify the crown top surface to the data generating device 1 so that the crown top surface passes through the apex of the crown of each tooth. The data generating device 1 can set a point indicating the apex of the crown by setting the crown top surface specified by the user for each tooth based on the user input. Note that the data generating device 1 may directly set a point indicating the apex of the crown based on the user input, rather than setting a crown top surface that passes through the apex of the crown. That is, the user may directly specify a point indicating the apex of the crown to the data generating device 1, rather than specifying a crown top surface to the data generating device 1.

[0041] The alveolar bone crest surface is an example of a "second plane" that passes through the position (for example, height) of the crest of the alveolar bone in the measurement direction. The data generating device 1 can set a point (an example of a "second point") indicating the crest of the alveolar bone on the second plane based on a user input. For example, while viewing an oral cavity image, the user uses the input device 30 to specify the alveolar bone crest surface to the data generating device 1 so that the alveolar bone crest surface passes through the crest of the alveolar bone of each tooth. The data generating device 1 can set a point indicating the crest of the alveolar bone by setting the alveolar bone crest surface specified by the user for each tooth based on the user input. Note that the data generating device 1 may directly set a point indicating the crest of the alveolar bone based on a user input, instead of setting an alveolar bone crest surface that passes through the crest of the alveolar bone. That is, the user may directly specify a point indicating the crest of the alveolar bone to the data generating device 1, instead of specifying the alveolar bone crest surface to the data generating device 1.

[0042] The gingival boundary surface is an example of a "second plane" and passes through the position (for example, height) of the boundary between the tooth and the gums (bottom of the periodontal pocket) in the measurement direction. The data generating device 1 can set a point (an example of a "second point") indicating the boundary between the tooth and the gums on the second plane based on a user input. For example, the user uses the input device 30 while looking at the oral cavity image to specify the gingival boundary surface to the data generating device 1 so that the gingival boundary surface passes through the boundary between the tooth and the gums for each tooth. The data generating device 1 can set a point indicating the boundary between the tooth and the gums by setting the gingival boundary surface specified by the user for each tooth based on the user input. Note that the data generating device 1 may directly set a point indicating the boundary between the tooth and the gums based on the user input, instead of setting a gingival boundary surface passing through the boundary between the tooth and the gums. That is, the user may directly specify a point indicating the boundary between the tooth and the gums to the data generating device 1, instead of specifying a gingival boundary surface to the data generating device 1.

[0043] The apical surface is an example of a "third plane" that passes through the position (for example, height) of the apex in the measurement direction. The data generating device 1 can set a point indicating the apex on the third plane (an example of a "third point") based on a user input. For example, while viewing an oral cavity image, the user uses the input device 30 to specify to the data generating device 1 an apical surface that passes through the apex of each tooth. The data generating device 1 can set a point indicating the apex by setting the apical surface specified by the user for each tooth based on the user input. Note that the data generating device 1 may directly set a point indicating the apex based on the user input, instead of setting an apical surface that passes through the apex. That is, the user may directly specify a point indicating the apex to the data generating device 1, instead of specifying an apical surface to the data generating device 1.

[0044] When there is no periodontal pocket or when the depth of the periodontal pocket is extremely small, the alveolar bone crest and the gingival boundary surface are identical or nearly identical, and the difference between the position of the alveolar bone crest and the position of the gingival boundary surface is less than a predetermined threshold value.

[0045] The data generating device 1 calculates the distance a along the measurement direction between the crown top surface and the gingival boundary or the alveolar bone crest as the crown length, and calculates the distance b along the measurement direction between the gingival boundary or the alveolar bone crest and the root apex as the root length. The crown length (distance a) is an example of a "first distance." The root length (distance b) is an example of a "second distance." Furthermore, the data generating device 1 calculates the ratio (a:b) of the crown length (distance a) to the root length (distance b) as the crown-root ratio.

[0046] Calculating the ratio (a:b) of the crown length (distance a) to the root length (distance b) is suitable when the alveolar bone crest and the gingival boundary are expected to be the same or approximately the same, but when the alveolar bone crest and the gingival boundary are expected to be different, the data generating device 1 calculates the distance a' between the crown crest and the alveolar bone crest along the measurement direction as the crown length, and calculates the distance b' between the alveolar bone crest and the root apex along the measurement direction as the root length. Furthermore, the data generating device 1 calculates the ratio (a':b') of the crown length (distance a') to the root length (distance b') as the crown-root ratio. For example, the data generating device 1 may determine whether the alveolar bone crest and the gingival boundary are the same or approximately the same by performing pocket measurements.

[0047] 4 to 7 are diagrams for explaining an example of setting the crown-root ratio. As shown in Fig. 4 to 7, the data generating device 1 can display oral cavity images of the subject to be photographed from various viewpoints on the display 20, and can display oral cavity images of the subject to be photographed enlarged or reduced on the display 20, based on a user input.

[0048] For example, as shown in FIG. 4, the data generating device 1 can display an image of an oral cavity in which a living tissue including teeth and gums is viewed from the front side of the mandible on the display 20. While viewing the oral cavity image shown in FIG. 4, the user uses the input device 30 to specify the tooth axis of the tooth to be measured for the crown-root ratio, and also to specify the crown apex, alveolar bone crest, and apical surface of the tooth to be measured. At this time, the user can adjust the position of the tooth axis by dragging the tooth axis to an arbitrary position using the input device 30, or adjust the positions (e.g., heights) of the crown apex, alveolar bone crest, and apical surface by dragging each of the crown apex, alveolar bone crest, and apical surface to the measurement direction (tooth axis direction). In this way, the user can adjust the point indicating the apex of the crown, the point indicating the apex of the alveolar bone, and the point indicating the apical portion by adjusting the positions (e.g., heights) of the crown apex, alveolar bone crest, and apical surface. Based on a user input, the data generating device 1 sets the tooth axis designated by the user for the tooth to be measured, and also sets the crown apical surface, alveolar bone crest surface, and apical surface.

[0049] When the data generating device 1 sets the tooth axis, the crown apex, the alveolar bone crest, and the apical surface based on the user input, it calculates the distance along the tooth axis between the crown apex and the alveolar bone crest as the crown length, and calculates the distance along the tooth axis between the alveolar bone crest and the apical surface as the root length. In the example of FIG. 4, the data generating device 1 calculates 8.7 mm as the crown length, and 13.4 mm as the root length. Furthermore, the data generating device 1 calculates the ratio between the crown length and the root length as the crown-root ratio, and displays it as a numerical value in a pop-up on the display 20. In the example of FIG. 4, the data generating device 1 calculates 0.65 as the crown-root ratio (crown length / root length), and displays it as a numerical value in a pop-up on the display 20. Furthermore, when the tooth to be measured is specified by the user input, the data generating device 1 adds a color to the tooth to be measured according to the crown-root ratio.

[0050] As shown in FIG. 5, the data generating device 1 can display an oral cavity image in which the living tissue including the teeth and gums is enlarged on the display 20. For example, the user can use the input device 30 to change the positions of the first point, the second point, and the third point for the tooth to be measured while viewing the oral cavity image shown in FIG. 5. For example, the data generating device 1 can adjust the dental crown apical surface, the alveolar bone apical surface, and the apical surface to more appropriate positions by dragging and moving each of the dental crown apical surface, the alveolar bone apical surface, and the apical surface. The data generating device 1 may perform the above-mentioned movement in the measurement direction. In particular, since the oral cavity image shown in FIG. 5 has enlarged living tissue compared to the oral cavity image shown in FIG. 4, the user can set the alveolar bone apical surface to an appropriate position even in a part that is difficult to detect such as the crest of the alveolar bone. In a calculation step described later, the data generating device 1 (the calculation device 11) calculates the ratio between the first distance and the second distance that changes depending on the positions of the first point, the second point, and the third point. In a calculation step described later, the data generating device 1 (the calculation device 11) calculates the ratio between the first distance and the second distance which changes depending on the positions of the first plane, the second plane, and the third plane.

[0051] 5, the data generating device 1 calculates a crown length of 8.9 mm and a root length of 13.2 mm as a result of the user fine-tuning the alveolar bone crest surface. As a result, the data generating device 1 calculates a crown-root ratio of 0.67 and displays it as a numerical pop-up on the display 20.

[0052] In this way, the data generating device 1 can enlarge the biological tissue shown in the intraoral image and display it on the display 20, so that the user can set the crown apex, alveolar bone crest, and apical surface to more appropriate positions while looking at the enlarged biological tissue shown in the intraoral image. This allows the user to measure the crown-root ratio more accurately.

[0053] As shown in FIG. 6, the user can also use the input device 30 to specify the gingival boundary surface instead of the alveolar bone crest surface to the data generating device 1. In this case, the user can adjust the position (e.g., height) of the gingival boundary surface by dragging it and moving it in the measurement direction (tooth axis direction) using the input device 30. In this way, the user can adjust the point indicating the boundary between the tooth and the gums by adjusting the position (e.g., height) of the gingival boundary surface. Based on the user input, the data generating device 1 sets the tooth axis specified by the user for the tooth to be measured, and also sets the crown apex, gingival boundary, and apical surface.

[0054] When the data generating device 1 sets the tooth axis, the crown apex, the gingival boundary, and the apical surface based on the user input, it calculates the distance along the tooth axis between the crown apex and the gingival boundary as the crown length, and calculates the distance along the tooth axis between the gingival boundary and the apical surface as the root length. In the example of FIG. 6, the data generating device 1 calculates 8.2 mm as the crown length, and 13.9 mm as the root length. Furthermore, the data generating device 1 calculates the ratio between the crown length and the root length as the crown-root ratio, and displays it as a pop-up on the display 20 as a numerical value. In the example of FIG. 6, the data generating device 1 calculates 0.59 as the crown-root ratio (crown length / root length), and displays it as a pop-up on the display 20 as a numerical value.

[0055] In this way, the data generating device 1 can set both the alveolar bone crest and the gingival line, allowing the user to measure the crown-root ratio based on the alveolar bone crest or the crown-root ratio based on the gingival line depending on the condition of the teeth and gums.

[0056] As shown in Fig. 7, the data generating device 1 can display an image of an oral cavity in which biological tissues including teeth and gums are viewed from the back side of the mandible on the display 20. That is, the user is not limited to viewing the biological tissues from the front side, but can view the biological tissues from any direction, such as the back side, to calculate the crown-root ratio. For example, while viewing the oral cavity image shown in Fig. 7, the user can drag and move each of the crown apex surface, alveolar bone crest surface, and apical surface of the tooth to be measured using the input device 30, thereby adjusting the crown apex surface, alveolar bone crest surface, and apical surface to appropriate positions.

[0057] When the data generating device 1 sets the tooth axis, the crown apex, the alveolar bone crest, and the apical surface based on the user input, it calculates the distance along the tooth axis between the crown apex and the alveolar bone crest as the crown length, and calculates the distance along the tooth axis between the alveolar bone crest and the apical surface as the root length. In the example of FIG. 7, the data generating device 1 calculates 9.8 mm as the crown length, and 12.3 mm as the root length. Furthermore, the data generating device 1 calculates the ratio between the crown length and the root length as the crown-root ratio, and displays it as a pop-up on the display 20 as a numerical value. In the example of FIG. 7, the data generating device 1 calculates 0.80 as the crown-root ratio, and displays it as a pop-up on the display 20 as a numerical value.

[0058] In this way, the data generating device 1 can display oral cavity images viewed from multiple viewpoints on the display 20 based on user input, and can set the crown top surface, alveolar bone top surface, gingival boundary surface, and apical surface in the oral cavity image viewed from a specific viewpoint selected from the multiple viewpoints based on user input, and can display oral cavity images viewed from multiple viewpoints on the display 20, and can set a first point, a second point, and a third point in the oral cavity image viewed from a specific viewpoint selected from the multiple viewpoints, allowing the user to measure the crown-root ratio when viewing the tooth from any direction.

[0059] [Data Generation Device Processing] The process executed by the data generating device 1 according to the embodiment will be described with reference to Fig. 8. Fig. 8 is a flowchart for explaining an example of the data generation process executed by the data generating device 1 according to the embodiment. Each step (hereinafter, indicated by "S") shown in Fig. 8 is realized by the control device 10 (arithmetic device 11) of the data generating device 1 executing the data generation program 100.

[0060] As shown in Fig. 8, the data generating device 1 displays an oral cavity image showing biological tissues including teeth and gums in three dimensions on the display 20 (S1). For example, as illustrated in Figs. 4 to 7, the data generating device 1 displays an oral cavity image showing biological tissues including teeth and gums in two dimensions as viewed from a predetermined viewpoint on the display 20. The process of S1 is an example of a "display step".

[0061] The data generating device 1 sets the tooth axis of the tooth to be measured for the crown-root ratio in the intraoral image displayed on the display 20 based on the user input input using the input device 30 (S2). The data generating device 1 sets the crown top surface, the gingival boundary surface or the alveolar bone top surface, and the apical surface that are perpendicular to the tooth axis in the intraoral image based on the user input input using the input device 30 (S3). The process of S3 is an example of a "point setting step". The data generating device 1 executes a process of adding a color according to the ratio between the first distance and the second distance to the tooth to be measured shown in the intraoral image. The data generating device 1 also executes a process of adding a numerical value according to the ratio between the first distance and the second distance to the tooth to be measured shown in the intraoral image.

[0062] The data generating device 1 calculates the crown-root ratio based on the crown top surface, the gingival boundary surface or the alveolar bone crest surface, and the apical surface (S4). The process of S4 is an example of a "calculation step". The data generating device 1 determines whether the crown-root ratio is smaller than 1 / 2 (S5). If the crown-root ratio is smaller than 1 / 2 (YES in S5), the data generating device 1 adds a first color (e.g., green) according to the crown-root ratio to the measurement target tooth shown in the intraoral image (S6). That is, the data generating device 1 displays the measurement target tooth in a first color (e.g., green) to indicate that the crown-root ratio is a normal value.

[0063] If the crown-root ratio is 1 / 2 or more (NO in S5), the data generating device 1 determines whether the crown-root ratio is 1 / 2 or more and less than 1 (S7). If the crown-root ratio is 1 / 2 or more and less than 1 (YES in S7), the data generating device 1 adds a second color (e.g., orange) corresponding to the crown-root ratio to the measurement target tooth shown in the intraoral image (S8). That is, the data generating device 1 displays the measurement target tooth in a second color (e.g., orange) to call attention to the fact that the crown-root ratio is approaching an abnormal value.

[0064] When the crown-root ratio is equal to or greater than 1 (NO in S7), the data generating device 1 adds a third color (e.g., red) according to the crown-root ratio to the measurement target tooth shown in the intraoral image (S9). That is, the data generating device 1 displays the measurement target tooth in a third color (e.g., red) to indicate that the crown-root ratio is an abnormal value.

[0065] After the process of S6, S8, or S9, the data generating device 1 adds a value corresponding to the crown-root ratio to the tooth to be measured and displays it on the display 20 as shown in Figs. 4 to 7 (S10). The data generating device 1 may output the value corresponding to the crown-root ratio in a CSV (Comma Separated Values) file or a text file. After that, the data generating device 1 ends this process. The apical side of the tooth axis is considered to be the low side of the tooth axis, and the crown side is considered to be the high side of the tooth axis. The first plane, the second plane, and the third plane are set at different heights that intersect with the tooth axis, are parallel to each other, and do not contact each other. It is preferable that the first point, the second point, and the third point are on a straight line. The straight line on which these points are lined up is called a point line. The point line that intersects with the first plane, the second plane, and the third plane may be parallel to the tooth axis, or may be non-parallel to the tooth axis. The point line may be perpendicular to the first plane, the second plane, and the third plane, or may intersect non-orthogonally. The positions of the first point, the second point, and the third point may be calculated to be the intersections of the first plane, the second plane, and the third plane, respectively (see FIG. 9 described later). Since the ratio between the points is calculated under the above-mentioned geometric conditions, it is possible to calculate the ratio of the same rate. Even if the points are not the object, the distance between the first plane, the second plane, and the third plane may be measured to calculate the ratio. Such first point, second point, and third point, or the first plane, the second plane, and the third plane, may be regarded as an index for calculating the ratio, and may be called a "ratio conservation index."

[0066] As described above, the data generating device 1 can display an image of an oral cavity viewed from a specific viewpoint selected from among a plurality of viewpoints on the display 20 based on a user input, and can set the crown apex, the alveolar bone crest or gingival boundary, and the apical surface in the oral cavity image. Furthermore, the data generating device 1 can calculate a crown-root ratio for a tooth to be measured based on the set crown apex, the alveolar bone crest or gingival boundary, and the apical surface, and can add a color corresponding to the calculated crown-root ratio to the tooth to be measured, and can display a numerical value indicating the crown-root ratio on the display 20. This eliminates the need for a user to measure the depth of a periodontal pocket, or to manually specify a point on an object shown in an X-ray image and manually measure the crown-root ratio by calculating a value obtained by the measurement, and can easily and accurately measure the crown-root ratio of a desired tooth.

[0067] <Modification> The present disclosure is not limited to the above-described embodiment, and various modifications and applications are possible. Modifications that can be applied to the present disclosure will be described below.

[0068] The data generating device 1 is configured to set the tooth axis manually specified by the user, but may automatically set the tooth axis using AI technology or the like without following the user input. For example, the data generating device 1 (control device 10) may include an estimation model (not shown) for estimating the tooth axis of the tooth shown in an oral cavity image based on the oral cavity image. The estimation model is trained by machine learning to estimate the tooth axis of the tooth shown in the oral cavity image based on the input oral cavity image data, using learning data that is a set of multiple oral cavity images and correct answer data indicating the tooth axis of the tooth shown in each of the multiple oral cavity images. By using such an estimation model, a user can automatically set the tooth axis estimated by the estimation model of the control device 10 to the oral cavity image by inputting the oral cavity image data to the data generating device 1.

[0069] The data generating device 1 is configured to set a first point (crown apex) indicating the top of the crown, a second point (alveolar bone apex, gingival boundary) indicating the top of the alveolar bone or the boundary between the tooth and the gums, and a third point (apical surface) indicating the root apex, which are manually specified by the user, but the above-mentioned points (planes) may be set automatically using AI technology or the like without following the user's input. For example, the data generating device 1 (control device 10) may include an estimation model (not shown) for estimating the first point (crown apex), the second point (alveolar bone apex, gingival boundary), and the third point (apical surface) for the tooth shown in the oral cavity image based on the oral cavity image. The estimation model is trained by machine learning to estimate the first point (crown apex), the second point (alveolar bone crest, gingival boundary), and the third point (apical surface) of the tooth shown in each of the multiple oral cavity images based on the input oral cavity image data, using learning data that is a set of multiple oral cavity images and correct answer data indicating the first point (crown apex), the second point (alveolar bone crest, gingival boundary), and the third point (apical surface) of the tooth shown in each of the multiple oral cavity images. By using such an estimation model, a user can automatically set the first point (crown apex), the second point (alveolar bone crest, gingival boundary), and the third point (apical surface) estimated by the estimation model of the control device 10 in the oral cavity image by inputting the oral cavity image data to the data generating device 1.

[0070] The estimation model may estimate the first point (crown apex) and the second point (gingival boundary surface) based on the measurement results using the bounding box. For example, during training, the estimation model encloses the teeth shown in each of the multiple oral cavity images with a three-dimensional bounding box for computation. The estimation model is machine-learned to estimate the tooth axis, the first point, and the third point based on the shape of the bounding box. For example, the estimation model divides the area occupied by the bounding box into two areas in a predetermined direction, calculates the three-dimensional center of gravity of the teeth in each area, and estimates that the straight line passing through the centers of gravity is the tooth axis. The estimation model may set two areas at a predetermined position without necessarily dividing the area into two. The estimation model may set more than two areas and determine an overall center of gravity. The estimation model is machine-learned to estimate, after setting the tooth axis, the surface located at a certain distance from the end face on the crown side of the bounding box to be the apical surface of the crown, and the surface located at a certain distance from the end face on the root side to be the apical surface of the crown. As for the second point, image data of the crestal surface of the alveolar bone and the gingival interface are available, so the estimation model can estimate the position using that data.

[0071] FIG. 9 is a diagram showing an example of using a bounding box. As shown in FIG. 9(a), the estimated model encloses the image data of the tooth T in a bounding box BB. The estimated model encloses the tooth T so that the tooth T is in contact with every surface of the bounding box BB and the tooth T is as even as possible. As shown in FIG. 9(b), the estimated model divides the bounding box BB into two regions, region B1 and region B2. The estimated model determines the three-dimensional center of gravity B1C of the tooth T in region B1 and the three-dimensional center of gravity B2C of the tooth T in region B2, and sets the straight line LN passing through both as the tooth axis TA. As shown in FIG. 9(c), the estimated model determines a first plane P1 that is a specific distance from the illustrated upper surface of the bounding box BB and perpendicular to the tooth axis TA, and a third plane P3 that is a specific distance from the illustrated lower surface and perpendicular to the tooth axis TA. The second plane P2 has image data of the alveolar bone crest and the gingival boundary surface, and the position of the second plane P2 is determined using the data. The first plane P1 is a plane corresponding to the crown top surface. The second plane P2 is a plane corresponding to the alveolar bone crest surface or the gingival boundary surface. The third plane P3 is a plane corresponding to the apical surface. That is, the first point is a point on the first plane P1 (crown top surface) passing through the crest of the crown. The second point is a point on the second plane P2 (alveolar bone crest surface) passing through the crest of the alveolar bone. Alternatively, the second point is a point on the second plane P2 (gingival boundary surface) passing through the boundary between the tooth and the gingiva. The third point is a point on the third plane P3 (apical surface) passing through the apex. The positions of the first point, the second point, and the third point may be calculated to be, for example, on the straight line LN, and to be the points where the first plane P1, the second plane P2, and the third plane P3 intersect with the straight line LN. The estimation model is thus machine-trained to estimate the first point, second point, and third point, respectively, using the first plane P1 (crown apex surface), the second plane P2 (alveolar bone crest surface or gingival boundary surface), and the third plane P3 (apical surface), which are identified based on the shape of the bounding box.

[0072] The configuration of the data generating device 1 described above may be included in an X-ray imaging device (CT imaging device). For example, the X-ray imaging device includes an imaging unit that images the upper and lower jaws of a subject. The X-ray imaging device may acquire CT data showing hard tissue parts (bones, teeth, etc.) around the upper and lower jaws of a subject by imaging with the imaging unit, generate an oral cavity image based on the acquired CT data and IOS data acquired by a three-dimensional scanner, and display the image on the display 20. Furthermore, the X-ray imaging device may calculate a crown-root ratio by setting a first point (crown apex), a second point (alveolar bone crest, gingival boundary surface), and a third point (apical surface) on the oral cavity image displayed on the display 20 based on a user input. Also, a first plane, a second plane, and a third plane may be set based on a user input to calculate a crown-root ratio.

[0073] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. Note that the configurations exemplified in the present embodiment and the configurations exemplified in the modified examples can be appropriately combined. [Explanation of symbols]

[0074] 1 data generation device, 10 control device, 11 arithmetic device, 12 memory, 13 storage device, 14 display interface, 15 input device interface, 16 storage medium interface, 17 communication device, 20 display, 30 input device, 31 keyboard, 32 mouse, 40 storage medium, 100 data generation program.

Claims

1. A data generating program for generating image data for confirming a state of a living tissue including teeth and gums, On the computer, A display step of displaying an oral cavity image showing the oral cavity including the biological tissue in three dimensions on a display; a point setting step of setting a first point indicating a crown of a tooth, a second point indicating a crest of an alveolar bone or a boundary between the tooth and the gum, and a third point indicating an apex of a root on the intraoral image based on a user input or machine learning; a calculation step of calculating a ratio of a first distance between the first point and the second point to a second distance between the second point and the third point.

2. 2. The data generation program according to claim 1, wherein the calculation step includes a step of causing the computer to move the first point, the second point, and the third point in a measurement direction based on the user input, and calculate a ratio of the first distance to the second distance that changes depending on the positions of the first point, the second point, and the third point.

3. The data generating program according to claim 2 , wherein the measurement direction is a direction along a tooth axis.

4. 4. The data generation program according to claim 3, further comprising a step of causing the computer to set the tooth axis specified by a user based on the user input, or a step of causing the computer to set the tooth axis using an estimation model for estimating the tooth axis based on the intraoral image.

5. The data generation program according to any one of claims 1 to 4, further comprising: a step of causing the computer to set the first point, the second point, and the third point specified by a user based on the user input; or a step of causing the computer to set the first point, the second point, and the third point using an estimation model for estimating the first point, the second point, and the third point based on the intraoral cavity image.

6. 6. The data generating program according to claim 5, wherein the estimation model encloses the tooth to be measured in a bounding box, and estimates the tooth axis, the first point, and the third point based on a shape of the bounding box.

7. the first point is a point on a first plane passing through the apex of the crown; the second point is a point on a second plane passing through a crest of the alveolar bone or a boundary between the tooth and the gum; the third point is a point on a third plane passing through the apex; The data generation program according to any one of claims 2 to 4, wherein the calculation step includes a step of causing the computer to move the first plane, the second plane, and the third plane in the measurement direction based on the user input, and calculate a ratio between the first distance and the second distance that changes depending on the positions of the first plane, the second plane, and the third plane.

8. The data generation program according to any one of claims 1 to 4, wherein the point setting step includes a step of causing the computer to display the oral cavity image viewed from a plurality of viewpoints on the display based on the user input, and to set the first point, the second point, and the third point in the oral cavity image viewed from a specific viewpoint selected from the plurality of viewpoints.

9. The data generation program according to any one of claims 1 to 4, further comprising a step of causing the computer to add a color to the teeth shown in the intraoral image according to a ratio between the first distance and the second distance.

10. The data generation program according to any one of claims 1 to 4, further comprising a step of causing the computer to add a numerical value corresponding to a ratio between the first distance and the second distance to the tooth shown in the intraoral image.

11. The data generation program according to any one of claims 1 to 4, wherein the oral cavity image is generated based on optical scanner data captured by an optical scanner, the optical scanner data including positional information of each point of a point cloud indicating the surface of the biological tissue, and CT data obtained by performing CT (Computed Tomography) on the biological tissue.

12. The data generation program according to any one of claims 1 to 4, further comprising a step of causing the computer to perform segmentation for each anatomical element shown in the intraoral image.

13. 1. A data generating method for generating image data for confirming a state of a biological tissue including teeth and gums, comprising: The process that the computer executes is as follows: A display step of displaying an oral cavity image showing the oral cavity including the biological tissue in three dimensions on a display; a point setting step of setting a first point indicating a crown of a tooth, a second point indicating a crest of an alveolar bone or a boundary between the tooth and the gum, and a third point indicating an apex of a root on the intraoral image based on a user input or machine learning; and calculating a ratio of a first distance between the first point and the second point to a second distance between the second point and the third point.

14. A data generating device for generating image data for confirming a state of a living tissue including teeth and gums, comprising: A display for displaying an image; an input device for accepting user input; a controller for controlling the display based on the user input; The control device includes: displaying an oral cavity image showing the oral cavity including the biological tissue in three dimensions on the display; Based on the user input or machine learning, a first point indicating a crown of a tooth, a second point indicating a crest of an alveolar bone or a boundary between the tooth and the gums, and a third point indicating a root apex are set on the oral cavity image; A data generating device that calculates a ratio of a first distance between the first point and the second point to a second distance between the second point and the third point.

15. An X-ray imaging device for generating image data for confirming the condition of living tissue including teeth and gums, An imaging unit that images an oral cavity including the teeth; A display for displaying an image; an input device for accepting user input; a controller for controlling the display based on the user input; The control device includes: Displaying an oral cavity image showing the oral cavity in three dimensions photographed by the photographing unit on the display; Based on the user input or machine learning, a first point indicating a crown of a tooth, a second point indicating a crest of an alveolar bone or a boundary between the tooth and the gums, and a third point indicating a root apex are set on the oral cavity image; An X-ray imaging device that calculates a ratio of a first distance between the first point and the second point to a second distance between the second point and the third point.

Images