KR102439870B1 - Method, device and computer program stored in recording medium for displaying teeth - Google Patents

Abstract

According to an embodiment, in a method for displaying a plurality of teeth, the method comprising: displaying a panoramic image including the plurality of teeth, a plurality of reference points for the plurality of teeth, and an arch line; determining an abnormal reference point requiring position adjustment among the plurality of reference points; receiving a user input requesting to update the position of the abnormal reference point; and updating and displaying the panoramic image based on the anomaly reference point updated according to the user input.

Description

A method for displaying a plurality of teeth, a device and a computer program stored in a recording medium {Method, device and computer program stored in recording medium for displaying teeth}

The present disclosure relates to a method for displaying a plurality of teeth, a device, and a computer program stored in a recording medium.

Conventionally, when generating a panoramic image, an arch line is manually positioned in a three-dimensional medical image according to a user input, and data corresponding to the position of the arch line is extracted from the three-dimensional medical image to generate a two-dimensional panoramic image.

In this conventional technique, it is difficult for the user to manually manipulate the arch line and the crown corresponding to the fixture to be implanted every time, so it is difficult to obtain an accurate arch line corresponding to the patient's tooth arrangement structure, and the result depends on each user. There is a big difference in the quality of , so there is a disadvantage in that the accuracy of the surgical guide manufactured using the obtained arch line is lowered. In addition, the prior art does not include information about the patient's tooth arrangement, and there is a problem in that a panoramic image including a skeletal image of a position deviating from the tooth arrangement is generated.

Accordingly, there is a need for a technique for improving user convenience while solving the above-described problems and obtaining an arch line more accurately.

Korean Patent Application Laid-Open No. 10-2016-0083788, method for generating a dental panoramic image, an apparatus therefor, and a recording medium recording the same

The present disclosure may provide a method and a device for displaying a plurality of teeth, and a computer program stored in a recording medium. Specifically, a method, device, and recording medium capable of increasing the accuracy of an arch line and improving user convenience by determining an abnormal reference point that requires position adjustment among a plurality of reference points used to determine the arch line and supporting the position correction thereof A computer program stored in the . The technical problem to be solved is not limited to the technical problems as described above, and various technical problems may be further included within the scope obvious to those skilled in the art.

A method of displaying a plurality of teeth according to a first aspect of the present disclosure includes: displaying a panoramic image including the plurality of teeth, a plurality of reference points for the plurality of teeth, and an arch line; determining an abnormal reference point requiring position adjustment among the plurality of reference points; receiving a user input requesting to update the position of the abnormal reference point; and updating and displaying the panoramic image based on an abnormal reference point updated according to the user input.

Also, the receiving of the user input may include providing the abnormal reference point to be distinguished from a normal reference point that does not require position adjustment.

In addition, the receiving of the user input may include providing a numerical value indicating a degree to which the height of the abnormal reference point differs from the height of the normal reference point adjacent to the abnormal reference point.

In addition, the receiving of the user input may include providing a numerical value indicating a degree to which an interval of the abnormal reference point differs from an interval of the normal reference point adjacent to the abnormal reference point.

In addition, the determining of the abnormal reference point may include: obtaining a first comparison result by comparing the height of the plurality of teeth with the height of the reference point; obtaining a second comparison result by comparing the distance between the plurality of teeth and the distance between the reference points; and determining the abnormal reference point based on the first comparison result and the second comparison result.

In addition, the updating and displaying of the panoramic image includes: when the abnormal reference points are adjacent to each other, updating all positions of the adjacent abnormal reference points based on the user input received with respect to any one of the adjacent abnormal reference points; can do.

In addition, the updating and displaying the panoramic image may include: acquiring an updated arch line based on the updated abnormal reference point; and displaying an updated panoramic image including the updated abnormal reference point and the updated arch line.

Also, the arch line may be determined to correspond to the plurality of reference points.

A device for displaying a plurality of teeth according to a second aspect of the present disclosure obtains a panoramic image including the plurality of teeth, a plurality of reference points for the plurality of teeth, and an arch line, and position adjustment among the plurality of reference points is performed. a processor for determining a necessary abnormal reference point and acquiring an updated panoramic image based on the updated abnormal reference point according to a user input requesting to update the position of the abnormal reference point; and a display configured to display the panoramic image and the updated panoramic image.

Also, the processor may provide the abnormal reference point to be distinguished from a normal reference point that does not require position adjustment.

Also, the processor may provide a numerical value indicating a degree to which the height of the abnormal reference point differs from the height of the normal reference point adjacent to the abnormal reference point.

In addition, the processor may provide a numerical value indicating a degree to which the interval of the abnormal reference point differs from the interval of the normal reference point adjacent to the abnormal reference point.

Also, when the abnormal reference points are adjacent to each other, the processor may update all positions of the adjacent abnormal reference points based on the user input received for any one of the adjacent abnormal reference points.

A third aspect of the present disclosure may provide a computer program stored in a recording medium to implement the method according to the first aspect. Alternatively, the fourth aspect of the present disclosure may provide a computer-readable recording medium recording a program for executing the method according to the first aspect on a computer.

According to an embodiment of the present invention, after providing a panoramic image by creating an arch line, the panoramic image is updated by correcting the reference point and the arch line according to whether the reference point is abnormal, so that the patient's tooth arrangement structure can be changed in a user-friendly environment. can be obtained more accurately.

In addition, by analyzing the gum line for the tooth image and determining the arch line based thereon, the arch line can be determined similarly to the trajectory of the actual patient's tooth arrangement, thereby greatly improving accuracy.

The effects of the present invention are not limited to the above effects, and it should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic diagram illustrating an example of a configuration of a device according to an embodiment.
2 is a flowchart illustrating an example of a method for a device to display a plurality of teeth, according to an exemplary embodiment.
FIG. 3 is a diagram for explaining an operation of displaying, by a device, a panoramic image including a plurality of teeth, a plurality of reference points for the plurality of teeth, and an arch line, according to an exemplary embodiment;
FIG. 4 is a diagram for explaining an operation in which a device distinguishes and displays an abnormal reference point and a normal reference point, according to an exemplary embodiment.
5 is a diagram for explaining an operation of providing, by a device, a numerical value indicating a difference between an abnormal reference point and a normal reference point, according to an exemplary embodiment.
6 is a diagram for explaining an operation of updating and displaying a panoramic image based on an abnormal reference point updated according to a user input by a device according to an exemplary embodiment.
7 is a diagram for describing an operation in which a device updates all positions of a plurality of abnormal reference points based on a user input, according to an exemplary embodiment.
8 is a diagram for describing an operation in which a device updates all intervals between a plurality of abnormal reference points based on a user input, according to an exemplary embodiment.
9 is a view for explaining an operation in which a device acquires a first panoramic image based on a first HU threshold for a plurality of teeth, according to an embodiment.
FIG. 10 is a diagram for explaining an operation in which a device acquires a second panoramic image based on a second HU threshold for a plurality of teeth, according to an embodiment.
11 is a view for explaining an operation in which a device determines a gum line using a first panoramic image and a second panoramic image, according to an exemplary embodiment.
12 is a diagram for describing an operation in which a device determines an arch line for a plurality of teeth, according to an exemplary embodiment.
13 is a diagram for describing an operation in which a device acquires tooth division for a plurality of teeth based on an arch line, according to an exemplary embodiment.
14 is a view for explaining an operation in which a device determines an implantation direction and height of a plurality of teeth, respectively, according to an exemplary embodiment.
15 is a view for explaining an operation in which a device determines an implantation direction and height of a plurality of teeth, respectively, according to an exemplary embodiment.
16 is a flowchart illustrating another embodiment of a method for a device to display a plurality of teeth according to an embodiment.
17 is a diagram for describing an operation in which a device acquires information on a HU distribution area according to an embodiment.
18 is a diagram for describing an operation in which a device determines a chin area, according to an exemplary embodiment.
19 is a diagram for describing an operation in which a device determines a jaw line, according to an exemplary embodiment.
20 is a diagram for describing an operation of a device for removing noise on a jaw line, according to an exemplary embodiment.
21 is a diagram for describing an operation of a device acquiring a jaw line and a center point, according to an exemplary embodiment.
22 is a diagram for explaining an operation of displaying, by the device, a plurality of teeth together with tooth division and an arch line, according to an embodiment.

Terms used in the embodiments are selected as currently widely used general terms as possible while considering functions in the present invention, but may vary according to intentions or precedents of those of ordinary skill in the art, emergence of new technologies, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

In the entire specification, when a part “includes” a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, the “… wealth", "… The term “module” means a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a schematic diagram illustrating an example of a configuration of a device 100 according to an embodiment, and FIG. 2 describes an embodiment of a method of displaying a plurality of teeth by the device 100 according to an embodiment This is a flow chart for

1 to 2 , a device 100 according to an embodiment may include a processor 110 and a display 120 .

In operation S210, the processor 110 according to an embodiment may determine the arch line 10 for a plurality of teeth. Here, the arch line 10 is an arch line indicating a line drawn by the teeth, and in an embodiment, may be determined to correspond to a plurality of reference points.

In an embodiment, the processor 110 obtains a gum line 30 corresponding to the gum plane based on the tooth image, and determines a plurality of reference points 20 for a plurality of teeth based on the gum line 30 . and the arch line 10 may be determined based on the plurality of reference points 20 . For example, the processor 110 obtains a three-dimensional tooth image (eg, CT data) of the patient's teeth, obtains a plurality of two-dimensional longitudinal slices for the maxilla and the mandible from the tooth image, and then stacks them. Detecting a jaw line based on the longitudinal cross-sectional image, obtaining a panoramic image along the jaw line from the longitudinal cross-sectional image to determine the gum line 30, and coronal planes for a plurality of teeth based on the gum line 30 ), a sagittal plane, and a reference point in each of the plurality of teeth based on the height of the plurality of teeth detected through the gum line 30 by acquiring images of the sagittal plane and the axial plane (eg, the central point) can be set, and the arch line 10 can be created by connecting each reference point.

In one embodiment, the tooth image may be a computed tomography (CT) image taken to analyze the shape of the tooth, but is not limited thereto. In another embodiment, the tooth image may be a digital imaging and communications in medicine (DICOM) digital image. may be As such, since the dental image may include various types of medical images, the technical scope of the present invention is not limited to a specific type of medical image. In addition, in an embodiment, the tooth image is 3D image data including voxels for the head, a 3D stereoscopic image in which only the tooth area is photographed, or a 3D image in which the entire body is photographed for diagnosis of teeth. It may include a stereoscopic image.

Various embodiments in which the processor 110 determines the arch line 10 according to an embodiment will be described below in more detail with reference to FIGS. 9 to 15 .

In operation S220 , the processor 110 according to an embodiment may display a panoramic image including a plurality of teeth, a plurality of reference points 20 for the plurality of teeth, and an arch line 10 . Details on this will be further described with reference to FIG. 3 .

FIG. 3 is a diagram for explaining an operation of displaying, by the device 100 , a panoramic image including a plurality of teeth, a plurality of reference points 20 for the plurality of teeth, and an arch line 10 , according to an exemplary embodiment.

Referring to FIG. 3A , the processor 110 provides a panorama including a plurality of teeth, a plurality of reference points 20 for the plurality of teeth, and an arch line 10 based on a first viewpoint observed from the front. Images can be displayed. For example, the processor 110 obtains a cross-section panoramic image of the tooth using the gum line 30, and the boundary line 320 of the tooth determined through tooth segmentation on the cross-section panoramic image. can be displayed so that the area of each tooth is partitioned as shown in identification number 310, and a plurality of reference points 20 and arch lines 10 can be displayed on the cross-section panoramic image (see identification numbers 20a and 10a) .

Referring to FIG. 3( b ), the processor 110 provides a panorama including a plurality of teeth, a plurality of reference points 20 for the plurality of teeth, and an arch line 10 based on the second viewpoint observed from above. Images can be displayed. For example, the processor 110 acquires an axial panoramic image of a tooth using the gum line 30 , and forms an arch line 10 and a plurality of reference points 20 on the axial panoramic image. Each can be displayed (see identification numbers 20b and 10b).

In step S230, the processor 110 according to an embodiment may determine an abnormal reference point that requires position adjustment among a plurality of reference points.

In an embodiment, the processor 110 may obtain a first comparison result by comparing the heights of the plurality of teeth with the heights of the reference point 20 , and may determine an abnormal reference point based on the first comparison result. For example, the processor 110 obtains the height of the tooth edge (refer to identification number 310) and the height of the reference point 20 on the arch line 10 appearing in the panoramic image, and the tooth image including the tooth standard data. In the case of comparing the height of each tooth and the position of the reference point with each other and there is a difference of more than a preset level, it can be detected as an abnormal position and determined as an abnormal reference point.

In an embodiment, the processor 110 may obtain a second comparison result by comparing the intervals between the plurality of teeth with the intervals between the reference points 20 , and determine an abnormal reference point based on the second comparison result. For example, the processor 110 determines the distance between the boundary lines 320 of the teeth through tooth division in the panoramic image or the distance between the center points of the tooth apex (refer to identification number 310) and the reference point 20 on the arch line 10. ), and comparing the distance between each tooth and the reference point interval in the tooth image including the tooth standard data, if there is a difference of more than a preset level, it can be detected as an abnormal interval and determined as an abnormal reference point.

In an embodiment, the processor 110 may determine an abnormal reference point based on the first comparison result and the second comparison result. For example, the processor 110 compares the height of the plurality of teeth with the height of the reference point 20, the first comparison value is greater than or equal to a preset first value, the distance between the plurality of teeth and the reference point 20 When the compared second comparison value is equal to or greater than the preset second value, it may be detected as an abnormal position and determined as an abnormal reference point. In an embodiment, the first value may be greater than the second value, and in this case, a higher priority may be given to the height item than the interval item in the process of determining the abnormal reference point.

In an embodiment, the processor 110 may determine an abnormal reference point based on a degree to which the arch line 10 corresponds to a straight line on the panoramic image. For example, the processor 110 may include two or more points (eg: By comparing the straight line connecting the three) and the arch line 10 , one or more reference points 20 having a difference by more than a preset distance may be determined as the abnormal reference point.

Accordingly, the processor 110 generates the arch line 10 to correspond to a straight line on the axial panoramic image as shown in FIG. By detecting an abnormal reference point deviating from an abnormality, the position and spacing of the reference point 20 may be finely corrected so that the arch line 10 corresponds to a straight line through a subsequent step.

In step S240, the processor 110 according to an embodiment may receive a user input requesting to update the location of the abnormal reference point. This will be described with further reference to FIGS. 4 to 5 .

4 is a diagram for explaining an operation in which the device 100 distinguishes and displays an abnormal reference point and a normal reference point according to an embodiment. It is a diagram for explaining an operation of providing a numerical value indicating a difference.

Referring to FIG. 4 , the processor 110 may provide an abnormal reference point to be distinguished from a normal reference point that does not require position adjustment. For example, when an abnormal reference point is determined among the plurality of reference points 20 according to the above-described operation, the processor 110 may determine the remaining reference points that do not correspond to the abnormal reference point as normal reference points that do not require position adjustment, as shown in FIG. As shown, the abnormal reference point (refer to identification number 20c) and the normal reference point may be displayed to be visually distinguished from each other (eg, in different colors) on the panoramic image.

Referring to FIG. 5 , the processor 110 may determine a numerical value indicating a degree to which an abnormal reference point differs from a normal reference point and display it together with the panoramic image. For example, the processor 110 visually displays the presence or absence of an abnormal reference point to be distinguished from a normal reference point as in the identification number 410, and when a user's selection input for an abnormal reference point requiring position adjustment is received through the user interface, the identification Mark the selected anomaly reference point as in number 510, and as in identification number 520, the coordinates of the position of the anomaly reference point on the panoramic image (eg (X ₁ , Y ₁ , Z ₁ )), height (eg H ₁ ) and adjacent reference point spacing ( Example: D ₁ ), a height difference value (eg, ΔH) from a normal reference point, and a difference value (eg, ΔD) between adjacent reference points may be calculated and displayed through the user interface.

In an embodiment, the processor 110 may provide a numerical value indicating a degree to which the height of the abnormal reference point differs from the height of the normal reference point adjacent to the abnormal reference point. For example, the processor 110 determines the height (eg, H ₁ ) of the abnormal reference point appearing in the panoramic image and the normal reference point closest to the abnormal reference point in the first direction (eg, left) and in the second direction (eg, right). It is possible to calculate a height difference (eg, ΔH) with respect to and display a numerical value indicating the largest difference as shown in identification number 520 .

In an embodiment, the processor 110 may provide a numerical value indicating a degree to which an interval of an abnormal reference point differs from an interval of a normal reference point adjacent to the abnormal reference point. In an embodiment, the interval may indicate a shortest distance between two points or a distance based on a horizontal plane. For example, the processor 110 calculates an interval (eg, D ₁ ) between an abnormal reference point and another reference point adjacent to the abnormal reference point in the panoramic image, and the average value ( Example: D _AV ) may be calculated, and a difference between the calculated interval and the average value (eg, ΔD = D _AV - D ₁ ) may be calculated and displayed as shown in identification number 520 .

In an embodiment, the processor 110 may receive a user input requesting to update the position of the abnormal reference point in a plurality of different ways, for example, a specific direction through the first user input as shown in identification number 530 . to receive an input requesting position adjustment by a preset reference unit, or directly receive from the user a correction value of one or more of the position, height, and interval of the abnormal reference point to be changed through a second user input as shown in identification number 540 You may.

In step S250 , the processor 110 according to an embodiment may update and display the panoramic image based on an abnormal reference point updated according to a user input. This will be described with further reference to FIGS. 6 to 8 .

6 is a diagram for explaining an operation of updating and displaying a panoramic image based on an abnormal reference point updated according to a user input by the device 100 according to an embodiment, and FIG. 7 is a view for explaining an operation of the device 100 according to an embodiment. ) is a diagram for explaining an operation of updating all positions of a plurality of abnormal reference points based on a user input, and FIG. 8 is a diagram illustrating the device 100 according to an embodiment of the present invention measuring the intervals between the plurality of abnormal reference points based on the user input. It is a figure for explaining the operation|movement of updating all.

Referring to FIG. 6 , the processor 110 updates an abnormal reference point according to a user input, acquires an updated arch line based on the updated abnormal reference point, and updates the updated abnormal reference point and the updated arch line including the updated abnormal reference point. Panoramic images can be displayed. In an embodiment, the processor 110 updates at least one of the position, height, and interval of the abnormal reference point according to the user input, and updates the arch line 10 so that the normal reference points and the updated abnormal reference point are connected to the panoramic image. can be updated.

In an embodiment, the processor 110 may provide a comparison result between the abnormal reference point before the update and the abnormal reference point after the update. For example, as shown in FIGS. 6(a) to 6(b), the processor 110 may display different colors on the panoramic image so that the abnormal reference point and the arch line 10 before and after the update are distinguished from each other. As shown in FIG. 6(c), the difference between the position, height and spacing between the abnormal reference point before the update (refer to identification number 20c) and the abnormal reference point after the update (refer to identification number 20d) is calculated. Alternatively, the difference between the numerical values indicating the degree to which the arch line 10 before the update and the arch line 10 after the update correspond to straight lines may be calculated and displayed together through the user interface.

Referring to FIG. 7 , when the abnormal reference points are adjacent to each other, the processor 110 may update all positions of the adjacent abnormal reference points based on a user input received with respect to any one of the adjacent abnormal reference points. For example, as shown in identification numbers 710 to 720 in the process of analyzing the abnormal reference point, the processor 110 determines the position of the first or more reference point when the first or more reference point and the second or more reference point adjacent to each other are determined. When the position of the first or more reference point is updated according to a user input requesting adjustment to a value of 1, even if there is no additional user input, the position of the second or more reference point is updated together with a second value related to the first value, , the arch line 20 may be updated by reflecting the updated positions of the first or more reference points and the second or more reference points.

In an embodiment, the processor 110 is configured to provide a first ratio indicating a ratio of a difference in positions between the first and normal reference points for a first value, and a position between a second abnormal reference point and a normal reference point for a second value. The second value may be determined so that the second ratio representing the ratio of the difference corresponds to each other. In another embodiment, the second value may be smaller than the first value.

In an embodiment, the processor 110 groups two or more reference points on the basis of a user input requesting grouping for two or more of the plurality of abnormal reference points, and receives user input for any one of the grouped abnormal reference points. All positions of the remaining grouped abnormal reference points may be updated based on the grouping. For example, as shown in identification number 530, the processor 110 receives a selection input for two or more reference points and a user input for requesting grouping or grouping release for two or more selected reference points through a user interface, grouping Alternatively, grouping may be released, and as shown in identification numbers 710 to 720, user convenience may be improved by updating the rest according to a user input requesting adjustment of the position of any one of the grouped abnormal reference points.

Referring to FIG. 8 , in the same manner, when the abnormal reference points are adjacent to each other, the processor 110 may update all the intervals between the adjacent abnormal reference points based on a user input received with respect to any one of the adjacent abnormal reference points. For example, as shown in identification numbers 810 to 820 in the process of analyzing the abnormal reference point, the processor 110 determines that the third or more reference point and the fourth or more reference point adjacent to each other are determined. When the interval of the third or greater reference point is updated according to a user input requesting to adjust the interval to the third value, even if there is no additional user input, the position of the fourth or greater reference point is set to the fourth value associated with the third value. It is updated together, and the arch line 20 may be updated by reflecting the updated interval between the third or greater reference point and the updated fourth or greater reference point.

Similarly, in an embodiment, the processor 110 may include a third ratio indicating a ratio of a difference between the third or greater reference point and the normal reference point for the third value, and the fourth or greater reference point and the normal reference point for the fourth value. A fourth value may be determined such that a fourth ratio indicating a ratio of a position difference between ' and ' may correspond to each other, and an interval between the grouped abnormal reference points may be updated together based on the above-described grouping.

Accordingly, the processor 110 generates the arch line 10 based on the plurality of reference points 20 , and then detects an abnormal position for the reference point 20 , and detects a position (height), an interval (width), and the like. ) can be provided as a numerical value, and user convenience can be improved by supporting fine adjustment.

In addition, when an abnormal area is detected with respect to the arch line 10 , the user can intuitively check it through the screen, select the reference point 20 displayed on the abnormal area to easily check the location information, and at the same time, the location adjustment interface By easily correcting the position and spacing of the reference point 20 through the There is convenience available.

Hereinafter, various embodiments of the step S210 of determining the arch line 10 for a plurality of teeth will be described in more detail with reference to FIGS. 9 to 15 .

9 and 10 are diagrams for explaining an operation in which the device 100 acquires a first panoramic image and a second panoramic image for a plurality of teeth, respectively, according to an embodiment.

Referring to FIG. 9 , the processor 110 according to an embodiment may acquire a first panoramic image of a plurality of teeth based on a first HU threshold. For example, the processor 110 renders a tooth image with a preset first HU threshold according to a pre-stored rendering algorithm to generate a first panoramic image of the foreground (eg, 180 degrees) for the maxilla and the mandible in the tooth image. can

Here, the HU (Hounsfield Unit) represents a reference unit indicating the degree of lightness or darkness of a tooth image, and in an embodiment, a scale used when rendering a medical image through CT may represent the degree of brightness on CT data. . Also, the HU threshold may be a reference value in which a preset HU value is expressed as a pixel value. For convenience, the term HU is used, but throughout the specification, HU may be understood as a concept that collectively refers to various unit scales used as a reference unit representing the brightness of an image.

Referring to FIG. 10 , the processor 110 according to an embodiment may acquire a second panoramic image of a plurality of teeth based on a second HU threshold. For example, as shown in FIG. 4 , the processor 110 renders a tooth image with a preset second HU threshold according to a pre-stored rendering algorithm, and a foreground for the maxilla and the mandible for the maxilla and the mandible in the tooth image (eg : 180 degrees) can create a second panoramic image.

In an embodiment, the first HU threshold may be greater than or equal to a preset value than the second HU threshold, for example, the second HU threshold may be less than or equal to half of the first HU threshold. In an embodiment, the processor 110 renders an image having a HU value greater than or equal to the first HU threshold greater than the second HU threshold in the tooth image, so that as shown in FIG. 3 , a relatively hard bone part (eg, tooth) is visually A relatively hard bone part (eg, tooth) as shown in FIG. 4 by rendering a first panoramic image represented by A second panoramic image can be created in which both the bone and the relatively non-hard bone part (eg, normal bone, gum, alveolar bone, other tissue, etc.) are both visually represented.

As such, according to the first HU threshold and the second HU threshold with a difference of more than a preset value, the first panoramic image (see FIG. 3 ) includes only an image of a hard bone part, and a second panoramic image (see FIG. 4 ) can contain images of both hard and normal bone parts.

In an embodiment, the processor 110 may determine the first HU threshold and the second HU threshold based on the pixel distribution for the tooth image. In an embodiment, the first HU threshold and the second HU threshold may be calculated by analyzing the HU distribution areas for a plurality of pixels on the tooth image. For example, the processor 110 analyzes the HU value of each pixel in a longitudinal sectional image obtained by stacking a plurality of two-dimensional longitudinal slices obtained from tooth data (eg, CT data) to calculate a HU distribution area (see FIG. 18 ). And, by analyzing the HU distribution area, based on the HU statistical value of the distribution corresponding to the shape of the mandible, the first HU threshold is determined to be greater than or equal to the preset value, and the first HU threshold is multiplied by a preset ratio (eg, 0.5) The second HU threshold may be calculated through calculation.

11 is a view for explaining an operation in which the device 100 determines the gum line 30 using the first panoramic image and the second panoramic image, according to an embodiment.

Referring to FIG. 11 , the processor 110 according to an embodiment may determine the gum line 30 based on a difference value between the first panoramic image and the second panoramic image. In an embodiment, the processor 110 may generate a third panoramic image according to a result of subtracting a pixel value for each coordinate of the first panoramic image from a pixel value for each coordinate of the second panoramic image, and within the third panoramic image can detect one or more regions in which the pixel value is greater than or equal to a preset value. : mandibular tooth area) can be detected.

In addition, the processor 110 may determine the gum line 30 by detecting the tooth division of the horizontal plane in each of the detected areas. For example, the processor 110 connects the upper boundary surface of the upper first region (eg, the maxillary tooth region) detected on the third panoramic image with a straight line (or curved line) so that the maxillary gum plane touches the maxillary gum. Determines the maxillary gum line 31 marked along the horizontal line, and connects the lower boundary surface of the lower second area (eg, the mandibular tooth area) detected on the third panoramic image with a straight line (or curved line) to make the mandible teeth It is possible to determine the mandibular gum line 32 in which the mandibular gum plane in contact with the mandibular gum is displayed along a horizontal line.

In an embodiment, the processor 110 may determine a first gum line based on a difference value between the first panoramic image and the second panoramic image, and determine a second gum line based on the first gum line. For example, as described above, the processor 110 connects the upper boundary surface of the maxillary tooth region detected in the third panoramic image along a horizontal plane to connect the first maxillary gum line 31a to the initial position of the maxillary gum line 31 . It is determined as , and the second maxillary gum line 31b may be determined as the final position of the maxillary gum line 31 based on the first maxillary gum line 31a and the surface in contact with the maxillary gum in each of the maxillary teeth. For another example, as described above, the processor 110 connects the lower boundary surface of the mandibular tooth region detected in the third panoramic image along a horizontal plane to form the first mandibular gum line 32a in the initial stage of the mandibular gum line 32 . position, and the second mandibular gum line 32b may be determined as the final position of the mandibular gum line 32 based on the first mandibular gum line 32a and the face in contact with the mandibular gum in each of the mandible teeth. That is, the processor 110 may detect the gum line more precisely by setting the first gum line shown in the dotted line as an initial value and then finding the second gum line shown in the solid line for each of the upper jaw and the mandible. .

In another embodiment, the processor 110 determines the first gum line and the second gum line based on the height of the surface in contact with the gum in each of the plurality of teeth, including the first gum line and the second gum line The gum line 30 may be displayed. For example, the processor 110 may set a preset first criterion (eg, located at the lowermost part of the surfaces where the maxillary teeth contact the maxillary gums) in the upper first region (eg, the maxillary tooth region) detected on the third panoramic image. The first maxillary gum line 31a is determined by displaying the plane that meets the vertical closest proximity to the maxillary gum along the horizontal plane, and the preset second criterion (eg, located at the topmost position) among the planes where the maxillary teeth come into contact with the maxillary gums. The second maxillary gum line 31b is determined by displaying the plane that meets the vertical and most circumstantial contact with the maxillary gum line along the horizontal plane, and as shown in FIG. 11, the first maxillary gum line 31a and the second The maxillary gum line 31b may be visualized in different ways (eg, a dotted line and a solid line, different colors, etc.) and displayed so as to be visually distinguished from each other. In the same manner, the processor 110 determines, respectively, the first mandibular gum line 32a and the second mandibular gum line 32b from the lower second region (eg, the mandibular tooth region) detected on the third panoramic image. and the first mandibular gum line 32a and the second mandibular gum line 32b may be displayed to be distinguished from each other.

In one embodiment, when the difference in height between the surfaces in contact with the gums in each of the plurality of teeth is equal to or greater than a preset value, the processor 110 is configured to provide upper and lower gum lines based on preset upper and lower statistical values, respectively. may decide.

Accordingly, the processor 110 may classify a hard bone such as a tooth and a general bone according to the HU of the CT data and process it as a panoramic image, and may detect gum planes through the panoramic image.

FIG. 12 is a diagram for explaining an operation in which the device 100 determines an arch line 10 for a plurality of teeth, according to an exemplary embodiment.

Referring to FIG. 12 , the processor 110 according to an embodiment may align the positions of the plurality of teeth determined based on the gum line 30 so that the arch line 10 corresponds to a straight line, and As the positions are aligned, the arch line 10 corresponding to the straight line may be determined. More specifically, the processor 110 may generate one or more of a horizontal plane (eg, an axial panoramic image) and a sagittal plane or a coronal plane (eg, a cross-section panoramic image) for a plurality of teeth along the gum line 30 from the tooth image. may be obtained, and the arch line 10 may be determined to pass through a predetermined specific point (eg, a central point) of each of a plurality of teeth on the acquired image. In an embodiment, the specific point may mean a reference point.

In one embodiment, the predetermined specific point of each of the plurality of teeth may be the center point of each tooth (eg, the center of a circle when each tooth is viewed in a circle), but is not limited thereto, and in another embodiment, each It may be a point located on the left, right, upper or lower side of the center point at a predetermined ratio for the tooth.

In an embodiment, the processor 110 may determine whether correction is required for at least one of the positions, depths, and angles of the plurality of teeth based on the arch line, and when it is determined that correction is required, it is determined that correction is required. A notification message including information on the determined tooth may be output. For example, the processor 110 quantifies the degree to which the arch line 10 is close to a straight line after determining the arch line 10 to pass through the center point of each of the plurality of teeth, as shown in Fig. 12 (b), If the digitized degree is less than the preset value, identification information of the tooth that is recommended to be corrected in order to correct the arch line 10 to be a straight line (eg, dental number, tooth name, position coordinate, etc.), correction item (eg position) , depth, angle, etc.) and recommended correction values (eg, recommended position value, recommended depth value, recommended angle value, etc.) are determined, and a notification message including them is outputted to provide an alarm to the user.

In an embodiment, the processor 110 may acquire an axial panoramic image according to the gum line 30 and the jaw line, and correct the jaw line to pass through the center point of each tooth on the axial panoramic image to first The arch line 10c can be created, and the data of the first arch line 10c and each tooth is corrected so that the first arch line 10c becomes a straight line to obtain a second arch line 10d corresponding to the straight line. and the axial panorama image may be updated accordingly.

FIG. 13 is a diagram for explaining an operation in which the device 100 acquires tooth division for a plurality of teeth based on the arch line 10 , according to an exemplary embodiment.

Referring to FIG. 13 , the processor 110 according to an embodiment may obtain tooth division for a plurality of teeth arranged along the arch line 10 . For example, the processor 110 detects a parabolic center point on the horizontal plane by analyzing the curve properties for the arch line 10, and the arch line 10 and the parabolic center point on the horizontal plane through the arch line 10 along the arch line 10 of the tooth. The tooth division may be determined based on the presence or absence and the boundary line 320 with the adjacent teeth. For example, the processor 110 determines the presence or absence of a tooth based on the continuous area size of an object displayed in white and black above a preset level within a preset unit area on a horizontal plane, and a vertical line at which the tooth starts or ends can be detected to determine the tooth segmentation for each tooth.

In an embodiment, the number of tooth divisions for a plurality of teeth may be greater than the number of teeth. For example, if there are 24 teeth, the number of tooth divisions may be 25.

In one embodiment, the processor 110 may determine the division of teeth for a plurality of teeth through pre-processing of the image, for example, by adjusting the size, sharpness, etc. of the image on the horizontal plane to a preset value or more, so that the boundary surface is Preprocessing can be performed on the image to make it appear better.

In one embodiment, the processor 110 may acquire an image for each of a plurality of teeth based on the arch line and tooth division for the plurality of teeth, for example, as shown in FIG. 13 , each A plurality of divided images may be generated by dividing an image of a tooth, and a boundary line 320 with a tooth adjacent to a center point of each divided image may be displayed as a vertical line.

14 and 15 are diagrams for explaining an operation in which the device 100 determines an implantation direction and height of a plurality of teeth, respectively, according to an exemplary embodiment.

Referring to FIG. 14 , the processor 110 according to an embodiment may determine an implantation direction of a plurality of teeth. For example, the processor 110 may analyze the panoramic image obtained from the tooth image to calculate an implantation direction including the inclination with respect to the horizontal plane of each of the plurality of teeth arranged along the arch line 10 . In one embodiment, each placement direction may be determined based on an angle with respect to the center point of the crown (or crown) and the center point of the alveolar bone (refer to identification number 1410).

In an embodiment, the processor 110 may determine the reference point 20 in the plurality of teeth based on the placement direction of the plurality of teeth. For example, the processor 110 updates the arrangement of the plurality of teeth on the coronal plane or the sagittal plane using the implantation direction of the plurality of teeth, detects the center point of each tooth, and sets the reference point 20 in the plurality of teeth. can decide

Referring to FIG. 15 , the processor 110 according to an embodiment may determine the heights of the plurality of teeth and determine the reference point 20 within the plurality of teeth based on the heights of the plurality of teeth. For example, the processor 110 analyzes the lateral panoramic image obtained from the tooth image, and the height of the alveolar bone through the gum line 30 for each of a plurality of teeth arranged along the arch line and divided according to tooth division. The height of each tooth may be determined by detecting the .

In one embodiment, each of the reference points 20 in the plurality of teeth may be a midpoint between the contact area between each tooth and the gum, but is not limited thereto. It may be a point located to the left, right, upper or lower side of the point. For example, as shown in Fig. 15 (a), each reference point 20 is located at the middle point of the tooth when viewed from the top along the horizontal plane, and when viewed from the side or front according to the coronal or sagittal plane, the teeth and gums It may be located at the center of the plane where it meets.

In an embodiment, the processor 110 may determine the arch line 10 based on the reference point 20 in the plurality of teeth. In an embodiment, the processor 110 may determine the reference point 20 within the plurality of teeth based on the gum line 30 and determine the arch line 10 by connecting the reference points 20 within the plurality of teeth. . For example, the processor 110 determines the reference point 20 in the plurality of teeth based on the tooth division and the height of the plurality of teeth detected through the gum line 30 , and as shown in FIG. 15( b ). , the arch line 10 obtained by connecting reference points in the plurality of teeth may be displayed on the panoramic image of the plurality of teeth.

In one embodiment, the processor 110 determines the reference point 20 in the plurality of teeth based on the implantation direction, height, and length of the plurality of teeth, and connects the reference point 20 to update the arch line 10 . can In an embodiment, the length information may include length values of left and right or front and back sides of each tooth viewed from the top or side, for example, it may be determined based on the length between the cheek boundary line and the lingual boundary line. For example, the processor 110 may determine a midpoint between the cheek boundary line and the lingual boundary line of each tooth as the reference point 20 , and correct the arch line 10 to pass through them.

Accordingly, the processor 110 uses the difference in the panoramic image to which different HU thresholds are applied, the height of the teeth, the direction of implantation, the division of teeth, etc. to reflect the patient's actual tooth structure more precisely using the arch line 10 . can be created, and the arch line 20 can be more precisely corrected so that the generated arch line 10 corresponds to a straight line on the axial panoramic image, and based on the user input through the above-described steps S220 to S250. By fine-tuning the arch line 20 as a result, the precision of the arch line 20 can be remarkably improved.

In addition, the processor 110 may generate and correct the arch line 10 through the above-described operation to pass a more substantial midpoint for each tooth in consideration of the implantation direction, height, etc. of the tooth.

The above-described embodiments may be performed for each of the maxilla and the mandible, and the arch line 10 passing through the center where the teeth meet the gums for each of the maxillary and mandibular teeth may be precisely found.

The processor 110 according to an embodiment may perform a series of operations for displaying a plurality of teeth, and may be implemented as a central processor unit (CPU) that controls the overall operation of the device 100 , and the display 120 . ) and other components may be electrically connected to control the data flow between them.

In an embodiment, the display 120 may refer generically to an image data processing device for displaying an image, for example, a liquid crystal display, a thin film transistor-liquid crystal display, or a thin film transistor-liquid crystal display. ), an organic light-emitting diode, a flexible display, a three-dimensional display (3D display), an electrophoretic display, and the like.

In addition, it can be understood by those of ordinary skill in the art that other general-purpose components other than those shown in FIG. 1 may be further included in the device 100 . According to an embodiment, the device 100 may further include an algorithm for 3D image data processing, a communication module for communicating with other devices through a wired/wireless network, a storage module for storing data, and the like, according to another embodiment. According to an example, some of the components shown in FIG. 1 may be omitted.

16 is a flowchart illustrating another embodiment of a method for the device 100 to display a plurality of teeth according to an embodiment.

16 may be understood with reference to all embodiments in which the device 100 illustrated in FIGS. 1 to 15 operates.

In step S1601, the device 100 according to an embodiment may obtain information on the HU distribution area by analyzing the pixel distribution regarding the HU on the tooth data. For example, the device 100 obtains a plurality of two-dimensional longitudinal slices obtained by longitudinally cutting tooth data (eg, CT data) so that one end of the mandible is included, and stacks the plurality of two-dimensional longitudinal slices to obtain a longitudinal image. acquired, and by analyzing the HU value of each pixel in the longitudinal cross-sectional image, it is possible to calculate a HU distribution area representing a pixel distribution having the same or similar HU value as shown in FIG. 17 .

In operation S1602, the device 100 according to an embodiment may determine a chin region based on the HU distribution region, and in operation S1603 may determine a chin line based on the chin region. For example, the device 100 determines a threshold for the HU value according to the HU distribution area, removes a pixel including an image information value less than or equal to a preset threshold from the longitudinal cross-sectional image, and then groups the pixels, as shown in FIG. As shown in Fig. 19, the jaw region can be detected according to the shape of the mandible, and a line representing the shape of the mandible is extracted from the longitudinal cross-sectional image according to a pre-stored line extraction algorithm (eg, thinning algorithm) to extract the jaw line as shown in FIG. can be detected.

In step S1604, the device 100 according to an embodiment may perform noise removal on the determined jaw line, and for example, as shown in FIG. When a noise pixel is formed, the noise pixel formed inside the mandible has an image information value by processing the longitudinal cross-sectional image according to the pre-stored noise removal algorithm (e.g., morphology algorithm), so that the noise pixel can be removed within the range where the mandible is formed. have.

In operation S1605, the device 100 according to an embodiment may acquire a jaw line and a center point. For example, as shown in FIG. 21 , the device 100 updates the jaw line according to the shape of the mandible in the longitudinal cross-sectional image from which the noise has been removed, and analyzes the parabolic curve characteristic for the jaw line to determine the center point of the jaw line ( Identification number 2110) can be calculated.

In an embodiment, the device 100 may perform position correction on the chin line or the arch line 10 based on a comparison result with the chin line and the arch line 10 . For example, when the device 100 compares the chin line and the arch line 10 and analyzes that the position of the arch line 10 is misaligned by more than a preset value compared to the chin line, the device 100 compares the chin line with the arch line 10 . The position and shape of the arch line 10 may be partially adjusted to be within the set value.

In step S1606, the device 100 according to an embodiment acquires a first panoramic image along the jaw line based on the first HU threshold, and acquires a second panoramic image along the jaw line based on the second HU threshold. can For example, the device 100 renders an image having a HU value greater than or equal to a relatively large first HU threshold with respect to a longitudinal sectional image in which a plurality of two-dimensional longitudinal slices are stacked, and as shown in FIG. 9 , a hard bone part such as a crown Creates a first panoramic image that appears, and renders an image having a HU value greater than or equal to a relatively small second HU threshold, as shown in FIG. can create

In step S1607, the device 100 according to an embodiment may determine the gum line 30 based on a difference value between the first panoramic image and the second panoramic image, for example, in the pixel value of the second panoramic image. A third panoramic image is generated by subtracting the pixel value of the first panoramic image, and the upper region and the lower region displayed in white above the preset HU value are detected in the third panoramic image, respectively, and the solid appearing in each region according to the jaw line The gum line 30 may be determined as shown in FIG. 11 by calculating the upper and lower gum planes in the tooth division of the bone part and the tooth bone (or air layer).

In operation S1608, the device 100 according to an embodiment may determine a tooth position according to the gum line 30 and align the tooth position according to the arch line 10 corresponding to a straight line. For example, the device 100 generates an axial panoramic image for each of the upper and lower jaws according to the gum line 30 and the corresponding upper and lower gum planes, and a plurality of teeth as shown in FIG. 12( a ). An arch line is created to pass through each central point, and when the arch line differs from a straight line by more than a preset level on the axial panoramic image, the arch line 10 is corrected to correspond to the straight line as shown in FIG. 12( b ). can do.

In operation S1609 , the device 100 according to an embodiment may determine the heights and implantation directions of the plurality of teeth, and in operation S1610 , the numbering results for the plurality of teeth and the arch line 10 may be displayed together. For example, the device 100 detects the height and inclination of the alveolar bone in the lateral cross-sectional image obtained according to the center point of the jaw line, and divides the tooth for each tooth by dividing the boundary surface of the tooth existing between the upper and lower gum planes. , and a predetermined number (eg, 28) of tooth areas corresponding to each of a plurality of teeth according to the arch line 10 based on the jaw line center of the tooth data (eg, CT data) and the tooth division of the teeth. can be calculated.

In an embodiment, the processor 110 may obtain a numbering result for a plurality of teeth arranged along the arch line 10 . In an embodiment, the numbering result for the tooth includes identification information for the tooth, and for example, may include one or more of a tooth number and a tooth name determined based on a preset dental diagram. In an embodiment, the numbering result for the teeth may be determined based on the arch line 10 and tooth division for each of a plurality of teeth positioned on the arch line 10 . For example, the processor 110 separates the plurality of teeth from each other based on the tooth division of the plurality of teeth arranged in the arch line 10 updated according to the above-described operation, and each tooth corresponds to the arch line 10 . It is possible to determine the tooth number of each tooth by identifying the position and order arranged on the tooth according to a preset dental diagram.

In an embodiment, as the arch line 10 is determined, the processor 110 may display at least one of a coronal plane, a sagittal plane, and a horizontal plane of a plurality of teeth aligned along the arch line 10 . For example, as shown in FIG. 22 , the processor 110 displays an arch line 10 on a horizontal plane image for a maxillary tooth (see identification number 2210 ), and a plurality of arch lines arranged along the arch line 10 . A tooth, a tooth division (refer to identification number 2220) and a reference line (refer identification number 2230) for each of the teeth, can be displayed as shown in FIG. By displaying the above-mentioned elements, it can be displayed as shown in FIG. 22(b).

In an embodiment, the reference line may be determined based on a reference point 10 of a tooth at a preset position among a plurality of teeth arranged along the arch line 10 , for example, as shown in FIG. 22( a ). As such, it may be displayed as a straight line connecting the reference points 10 of each of a preset number (eg, three) of teeth corresponding to a preset position (eg, tooth number). In another embodiment, the reference line may be determined based on a curved characteristic of the arch line 10 , for example, detecting a center point of a parabola displayed on a horizontal plane and left, right and upper sides of the parabola according to a preset criterion. It can be expressed as a straight line connecting the points of

In an embodiment, the display 120 may display a numbering result for a plurality of teeth and a guide line corresponding to tooth division together. In an embodiment, the guide line (refer to identification number 2240) corresponding to tooth division may include a line perpendicular to the progress direction of the arch line 10 and divided according to a preset unit distance. Accordingly, information on the position and size of each tooth can be intuitively guided to the user.

According to an embodiment of the present invention, the device 100 precisely automatically calculates the arch, arch line, tooth position, etc. from CT data in the guide design process for dental implant surgery using software, and fine-tunes it based on user manipulation. By doing so, it is possible to minimize the operation of drawing the arch, the operation of the position of the crown, and the like, which required the user's intervention, and thus it is possible to improve the user's convenience.

Meanwhile, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium. In addition, the structure of the data used in the above-described method may be recorded in a computer-readable recording medium through various means. The computer-readable recording medium includes a storage medium such as a magnetic storage medium (eg, ROM, RAM, USB, floppy disk, hard disk, etc.) and an optically readable medium (eg, CD-ROM, DVD, etc.). do.

A person of ordinary skill in the art related to this embodiment will understand that it can be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

100: device
110: processor
120: display
10: arch line
20: reference point
30: gum line

Claims (14)

In the method of displaying a plurality of teeth,
displaying a panoramic image including the plurality of teeth, a plurality of reference points for the plurality of teeth, and an arch line;
determining an abnormal reference point requiring position adjustment among the plurality of reference points;
receiving a user input requesting to update the position of the abnormal reference point; and
Renewing and displaying the panoramic image based on the anomaly reference point updated according to the user input.
The method of claim 1,
Receiving the user input includes:
providing the abnormal reference point to be distinguished from a normal reference point that does not require position adjustment; and
Acquiring a first panoramic image for a plurality of teeth based on a first HU threshold and a second panoramic image for the plurality of teeth based on a second HU threshold,
The arch line is determined based on the plurality of reference points and the gum line,
The gum line is determined based on a difference value between the first panoramic image and the second panoramic image.
3. The method of claim 2,
The step of receiving the user input is
Providing a numerical value indicating the degree to which the height of the abnormal reference point differs from the height of the normal reference point adjacent to the abnormal reference point;
3. The method of claim 2,
The step of receiving the user input is
Providing a numerical value indicating the degree to which the interval of the abnormal reference point is different from the interval of the normal reference point adjacent to the abnormal reference point;
The method of claim 1,
The step of determining the abnormal reference point is
obtaining a first comparison result by comparing the heights of the plurality of teeth with the heights of the reference points;
obtaining a second comparison result by comparing the distance between the plurality of teeth and the distance between the reference points; and
determining the abnormal reference point based on the first comparison result and the second comparison result;
The step of determining the abnormal reference point,
When the first comparison result is equal to or greater than the first value and the second comparison result is equal to or greater than the second value, determining an abnormal reference point;
and a priority given to the first comparison result and the second comparison result is determined based on magnitudes of the first value and the second value.
The method of claim 1,
The step of updating and displaying the panoramic image is
When the anomaly reference points are adjacent to each other, updating all positions of the adjacent anomaly reference points based on the user input received with respect to any one of the adjacent anomaly reference points.
The method of claim 1,
The step of updating and displaying the panoramic image is
acquiring an updated arch line based on the updated abnormal reference point; and
Displaying an updated panoramic image including the updated anomaly reference point and the updated arch line.
The method of claim 1,
The arch line is determined corresponding to the plurality of reference points,
The above reference point is
The method of claim 1, wherein the arch line of the panoramic image is determined based on a degree corresponding to a straight line connecting points of a preset position among the plurality of reference points.
In the device for displaying a plurality of teeth,
Obtaining a panoramic image including the plurality of teeth, a plurality of reference points for the plurality of teeth, and an arch line, determining an abnormal reference point requiring position adjustment among the plurality of reference points, and requesting position update of the abnormal reference point a processor for obtaining an updated panoramic image based on an abnormal reference point updated according to a user input; and
A device comprising a; a display for displaying the panoramic image and the updated panoramic image.
10. The method of claim 9,
the processor
determining the abnormal reference point based on the degree to which the arch line of the panoramic image corresponds to a straight line connecting points at a preset position among the plurality of reference points,
A device for providing the abnormal reference point to be distinguished from a normal reference point that does not require the position adjustment.
11. The method of claim 10,
the processor
A device for providing a numerical value indicating a degree to which the height of the abnormal reference point differs from the height of the normal reference point adjacent to the abnormal reference point.
11. The method of claim 10,
the processor
A device that provides a numerical value indicating a degree to which the interval of the abnormal reference point differs from the interval of the normal reference point adjacent to the abnormal reference point.
10. The method of claim 9,
the processor
When the abnormal reference points are adjacent to each other, the device is configured to update all positions of the adjacent abnormal reference points based on the user input received with respect to any one of the adjacent abnormal reference points.
A computer program stored in a recording medium to implement the method of any one of claims 1 to 8.

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