KR20170128046A - Method and Apparatus for Obtaining Information of Radiographic Images - Google Patents

Abstract

According to the present invention, provided are a method and an apparatus for obtaining information of radiographic images. The method for obtaining space information of a target included in three-dimensional radiographic images uses the apparatus for obtaining the space information of the target included in the three-dimensional radiographic images. The apparatus comprises: a two-dimensional image generation unit of generating two-dimensional images by projecting the inputted three-dimensional radiographic images on a first reference plane; a target image obtaining unit of obtaining two-dimensional target images with respect to the target included in the generated two-dimensional images; and a space information obtaining unit of obtaining the space information of the target by projecting the two-dimensional target images onto a reference axis. The method comprises the following steps: projecting the inputted three-dimensional radiographic images onto the first reference plane, which is predetermined, to generate the two-dimensional images; obtaining the two-dimensional target images with respect to the target included in the generated two-dimensional images; and projecting the two-dimensional target images onto the reference axis to obtain the space information of the target. The purpose of the present invention is to provide the method and the apparatus for obtaining information of radiographic images which are capable of efficiently obtaining necessary information through image processing from three-dimensional medical radiographic images.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for obtaining information of a radiological image,

The present invention relates to a method and apparatus for facilitating acquisition of necessary information from a three-dimensional image. More particularly, the present invention provides a method and apparatus for acquiring information of a radiological image, which enables efficient acquisition of necessary information through image processing from a three-dimensional medical radiological image.

Generally, in the medical field, X-ray images such as CT are used for medical purposes. This is because when an image is irradiated with X-rays or the like having a high transmittance to the object, the projection of the object is detected by the image sensor that receives the irradiated radiation using the characteristic that the intensity of the X- ≪ / RTI > In particular, in the case of dentistry, x-ray images of the entire jaw and head, especially the patient's arch, are generated and used for diagnosis. However, X-ray images are images of internal tissues of the human body, and are not familiar to the general public, not experts, and specialist personnel must undergo a separate process in order to acquire information necessary for medical treatment.

Particularly, in the field of dentistry or plastic surgery, images reconstructed from various directions are continuously used for the purpose of medical treatment or other purposes. In this case, a separate workforce is required in the image processing process and continuous work is required, A burden is generated. Therefore, there is a demand for a scheme for acquiring desired information from a video image more efficiently.

On the other hand, in the case of a dental cone beam computerized tomography (CBCT) used to photograph the patient's jaw and head area in a dental clinic, And a reconstructed panoramic image and a cross-sectional image are taken after the point is taken. In this process, specialist personnel such as radiologists and hygienists are input, there is a possibility of error according to the skill of the operator, It is necessary to provide a method for acquiring a standardized reconstructed image more quickly and accurately.

In order to generate a reconstructed image, the existing methods have used only the crown of the tooth and calculated the height of the occlusal surface to draw the arch. However, And it is difficult to apply it to partial edentulous patients. In addition, existing methods have a problem in that it is difficult to reconstruct an image in the case of a section in which a part of the tooth is photographed, assuming only the case where the full arch of the arch is photographed.

US 8849016 B2

An object of the present invention is to propose an efficient spatial information acquisition method for a three-dimensional radiation image.

It is another object of the present invention to provide a method and apparatus for acquiring a target region and coordinate information included in a three-dimensional radiographic image with respect to a three-dimensional radiographic image.

According to an aspect of the present invention, there is provided an apparatus for acquiring a spatial information of a target included in a three-dimensional radiographic image, comprising: a projection unit for projecting an input three-dimensional radiation image onto a predetermined first reference plane to generate a two- A target image acquiring unit that acquires a two-dimensional target image of a target included in the generated two-dimensional image, and a target-image acquiring unit that projects the two-dimensional target image onto a predetermined reference axis, And a spatial information obtaining unit for obtaining the spatial information.

The spatial information obtaining unit determines a boundary value for defining a boundary on which the target is distributed based on at least one reference axis included in the first reference plane in a projected image obtained by projecting a two-dimensional target image on a predetermined reference axis And determining a second reference plane in consideration of the determined boundary value and integrating the tomographic images parallel to the determined second reference plane and reconstructed from the three dimensional radiographic image according to the boundary value, And a second two-dimensional image generating unit for generating a two-dimensional image of the second image.

And a third boundary value determiner for determining a third boundary value for defining a boundary in which the target is distributed based on a reference axis perpendicular to the first reference plane with respect to the determined second binarization reference value .

The second two-dimensional image generating unit may include a second two-dimensional pre-target image acquiring unit for acquiring a second two-dimensional target image by binarizing the generated second two-dimensional image with respect to a predetermined first binarization reference value A binarized binary image with respect to a binarization reference value, comprising: a region determining unit for determining an area including the target; a contrast increasing unit for increasing the contrast of the determined area in the second two-dimensional image; And a second binarization unit for binarizing the first binarization reference value with respect to a predetermined second binarization reference value.

The spatial information obtaining unit may calculate the first coordinate in the first reference axis direction for at least one feature point included in the target image by projecting the obtained two-dimensional target image on the first reference axis included in the first reference plane, Masking a target image obtained by masking at least a part of a region including a region corresponding to the first coordinate in the obtained two-dimensional target image, and outputting the masked target image to the first reference axis, And a second coordinate calculation unit for calculating a second coordinate in the second reference axis direction in consideration of a distribution interval of the target image projected and masked in the second reference axis direction can do.

At this time, in the inputted three-dimensional radiographic image, a two-dimensional image at a reference plane parallel to a third reference plane having a first coordinate value in the first reference axis direction and perpendicular to the first reference axis is binarized, And a third coordinate calculator for calculating a third coordinate of the feature point by projecting the third reference coordinate in the direction of the third reference axis perpendicular to the axis.

According to another aspect of the present invention, there is provided a method for acquiring spatial information of a target included in a 3D radiographic image, comprising: projecting an input 3D radiographic image onto a predetermined first reference plane to generate a 2D image; Acquiring a two-dimensional target image for the target included in the generated two-dimensional image, and projecting the two-dimensional target image on a predetermined reference axis to acquire the spatial information of the target.

The projection on the first reference plane may be implemented by integrating the brightness information of the tomographic images included in the interval between reference planes parallel to the first reference plane with respect to the input three-dimensional image.

The predetermined reference axis in the present invention includes a first reference axis and a second reference axis perpendicular to the first reference axis, and projecting on a predetermined reference axis includes projecting a two-dimensional target image in the direction of the first reference axis And projecting the two-dimensional target image in the direction of the second reference axis.

In particular, projecting on the predetermined first reference axis can project the two-dimensional target image in at least one of a first axis in the vertical direction and a second axis in the horizontal direction included in the first reference plane.

At this time, the spatial information includes spatial information on a plurality of boundary surfaces for defining a boundary region in which the target is distributed in the two-dimensional target image of the first reference plane, or spatial information on a plurality of boundary surfaces Dimensional position coordinates, and the first reference surface may be implemented by the first reference surface being any one of an axial surface, a sagittal surface, and a coronal surface.

According to an embodiment of the present invention, acquiring the spatial information of the target includes a step of acquiring spatial information of a target, based on at least one reference axis included in the first reference plane in a projected image obtained by projecting a two- Determining a boundary value for defining a boundary in which the target is distributed, determining a second reference plane in consideration of the determined boundary value, and determining tomographic images parallel to the determined second reference plane and reconstructed from the three- And generating a second two-dimensional image by performing section integration on the basis of the boundary value, and acquiring a second two-dimensional target image using the generated second two-dimensional image.

Here, the step of acquiring the second two-dimensional target image may include a step of acquiring a second two-dimensional preliminary target image by binarizing the generated second two-dimensional image with respect to a predetermined first binarization reference value, Dimensional binarization with respect to a binarization reference value, comprising: determining a region including a target; increasing a contrast of the region determined in the second two-dimensional image; and comparing the contrast-increased region with a predetermined second binarization And obtaining a second two-dimensional target image by binarizing the reference value.

The method may further include the step of determining a third boundary value for defining a boundary in which the target is distributed on the basis of a reference axis perpendicular to the first reference plane with respect to a predetermined second binarization reference value, 1 binarization reference value is determined in consideration of the distribution of the pixel values of the second two-dimensional image, and the second binarization reference value is determined in a two-dimensional image binarized according to the first binarization reference value and the first binarization reference value, And the second binarization reference value may be determined to be a value not larger than the first binarization reference value.

The step of acquiring the spatial information of the target according to another embodiment of the present invention includes the steps of projecting the obtained two-dimensional target image onto a first reference axis included in the first reference plane, Calculating a first coordinate in a first reference axis direction with respect to a minutiae point, masking a remaining area of the obtained two-dimensional target image excluding at least a partial area including a region corresponding to the first coordinate, The masked target image is projected in a second reference axis direction perpendicular to the first reference axis and the masked reference image is projected in the second reference axis direction, And calculating a second coordinate.

Dimensional image at a reference plane parallel to a third reference plane perpendicular to the first reference axis with the first coordinate value in the first reference axis direction in the input three-dimensional radiation image, 1 and a third reference axis perpendicular to the second reference axis to calculate a third coordinate of the feature point.

The feature of the present invention may be at least one of the following: Menton, Gnathion, Nasion, or Orbitale, and the target may not be covered with the gum as part of the teeth, Which is a part of the crown or mandible.

FIG. 1 shows an apparatus for acquiring spatial information of a target included in a three-dimensional radiographic image according to an embodiment of the present invention.
FIG. 2 is a detailed block diagram of a second two-dimensional target image acquisition unit in a target spatial information acquisition apparatus included in a three-dimensional radiation image according to an embodiment of the present invention.
FIG. 3 illustrates a method of acquiring spatial information of a target included in a three-dimensional radiographic image according to an embodiment of the present invention.
FIG. 4 illustrates details of acquiring spatial information of a target in a method of acquiring spatial information of a target included in a 3D radiological image according to an exemplary embodiment of the present invention.
FIG. 5 illustrates a step of acquiring spatial information of a target in a spatial information acquisition method of a target included in a three-dimensional radiographic image according to an exemplary embodiment of the present invention.
FIG. 6 illustrates a step of generating a second two-dimensional image in a method of acquiring spatial information of a target included in a three-dimensional radiological image according to an exemplary embodiment of the present invention.
FIG. 7 illustrates an example of a step of acquiring spatial information of a target in a spatial information acquisition method of a target included in a three-dimensional radiation image according to an exemplary embodiment of the present invention.
FIG. 8 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 9 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiation image according to the present invention.
FIG. 10 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 11 shows an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 12 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiation image according to the present invention.
FIG. 13 shows an embodiment of a method of acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 14 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiation image according to the present invention.
FIG. 15 shows an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 16 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 17 illustrates an embodiment of a method for acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention.
FIG. 18 shows an embodiment of a method for acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention.

In order to fully understand the invention and the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as " including " an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

1 shows an apparatus 10 for acquiring spatial information of a target included in a three-dimensional radiographic image according to an embodiment of the present invention. The target spatial information obtaining apparatus 10 included in the three-dimensional radiation image according to the present invention can retrieve the previously generated three-dimensional image or output the spatial information of the image with the newly captured three-dimensional image as an input . At this time, the outputted spatial information may include the area information of the target or the coordinate information of the minutiae.

The target spatial information acquisition apparatus 10 included in the 3D radiation image may include a two-dimensional image generation unit 100, a target image acquisition unit 200, and a spatial information acquisition unit 300.

The two-dimensional image generating unit 100 may generate a two-dimensional image by projecting the input three-dimensional radiation image on a predetermined first reference plane. In this case, the 3D radiation image may be input through a separate device or may use a previously stored image. The object to be imaged can be preferably applied to a head area including the upper and lower parts of the patient, but not limited thereto, and other objects required for medical treatment and therapeutic purposes. At this time, the image generating unit 100 may generate a two-dimensional image by projecting the input three-dimensional image on a predetermined first reference plane, and transmit the generated two-dimensional image to the target image obtaining unit 200, The brightness information of the tomographic images included in the interval between the reference planes parallel to the 1 reference plane may be integrated. Integrating the brightness information can be performed by any of a method of integrating only the maximum value of the brightness, a method of integrating only the minimum value of brightness, and a method of integrating the brightness to the average value of brightness.

In this case, the first reference plane may be any one of a sagittal plane, an axial plane, and a coronal plane, and when the target is a tooth, a sagittal plane may be projected as a first reference plane to generate a two-dimensional image.

The target image obtaining unit 200 may obtain a two-dimensional target image of the target included in the generated two-dimensional image. The obtained two-dimensional target image can be implemented as a binary image in which a boundary for the target region appears, and the target can be determined in advance for an area requiring spatial information such as a tooth, an entire skull, etc. included in the image . The 2D target image can be obtained from the input 2D image through the image processing process. The image processing process takes into account the anatomical structure of the target and uses binomial, hole filling, expansion and image processing techniques such as dilation, thinning, and the like.

The spatial information obtaining unit 300 may be implemented by including an area calculation unit 310 and a coordinate calculation unit 320. [ The spatial information obtaining unit 300 obtains spatial information of the target by projecting a two-dimensional target image on a predetermined reference axis. At this time, it is possible to obtain the spatial information including the area information of the target and the minutia coordinate information by using the target image as an input. In one embodiment of the present invention, the target may be a tooth, and the minutiae point may be predetermined as the lower limit of the patient.

The region calculation unit 310 may include a first boundary value determination unit 312 and a second two-dimensional target image acquisition unit 314 and may optionally include a third boundary value determination unit 316 Can be implemented. The region calculation unit 310 can obtain the boundary values for defining the distribution of the target on each reference axis by projecting the acquired target image.

The first boundary value determiner 312 defines a boundary on which the target is distributed based on at least one reference axis included in the first reference plane in a projected image obtained by projecting a target image of a dimension on a predetermined reference axis The reference axis may be included in the first reference plane and may be defined as a reference axis in the vertical direction corresponding to the height of the space where the target is located. In addition, the first boundary value can be determined including the horizontal reference axis corresponding to the depth of the target space.

The second two-dimensional target image obtaining unit 314 determines the second reference plane in consideration of the determined first boundary value, and outputs the tomographic images that are parallel to the determined second reference plane and reconstructed from the three- The second two-dimensional image can be generated by performing the section integration according to the boundary value. In this case, in determining the second reference plane, the second reference plane may be any one of a sagittal plane, an axial plane, and a coronal plane. If the target is a tooth and the first reference plane is a sagittal plane, have.

The second two-dimensional target image obtaining unit 314 obtains a second two-dimensional preliminary target image by binarizing the generated second two-dimensional image with respect to a predetermined first binarization reference value, Determining a region including the target in the binarized two-dimensional image with respect to the reference value, increasing the contrast of the determined region in the second two-dimensional image, binarizing the region with the increased contrast to a predetermined second binarization reference value A two-dimensional target image can be obtained.

The third threshold value determining unit 316 may determine a third threshold value for defining a boundary in which the target is distributed based on a reference axis perpendicular to the first reference plane with respect to a predetermined second reference value have. At this time, the reference axis perpendicular to the first reference plane can be defined as a third reference axis, and the third boundary value can be defined to correspond to the width of the target space.

The coordinate calculation unit 320 may include a first coordinate calculation unit 321 and a second coordinate calculation unit 323 and may further include a third coordinate calculation unit 325. [ The coordinate calculation unit 320 may obtain the three-dimensional position coordinates of at least one feature point that requires spatial information as a part of the target, using the obtained target image as an input. For example, the positional coordinates of the patient with respect to the Menton can be obtained. The minutiae in the present invention include a Gnathion positioned at the forefront of the lower jaw in the midline of the sagittal plane, a lower point Menton at the lower frontal midline, Nasion, an Orbitale, Point A, which is the last point of the curve between alveolar apexes, point B, which is the last point on the mandibular curve above infra-dental and pogonion, and Gonion, etc. . At this time, the anterior nasal spine (ANS) is the forefront point of the maxilla and the superior proximal point (SPr) is the best point of the maxillary alveolar bone, and the infradentale (Id, infradentale) (Pog, pogonion) means the forefront point in the outline of the tip of the chin, respectively.

The first coordinate calculator 321 projects the obtained two-dimensional target image on a first reference axis included in the first reference plane, and calculates a first reference axis for at least one feature point included in the target image The first coordinate may be calculated. In particular, when the feature point to be obtained is the lower limit of the patient, a target image is acquired from the two-dimensional image generated with respect to the sagittal plane, The position of the head as the target can be grasped from the one-dimensional information obtained by the projection. Thus, the first boundary value of the minutiae point can be obtained, and the height information of the minutiae point, that is, the sagittal plane, can be obtained.

The second coordinate calculation unit 323 performs masking processing on the obtained two-dimensional target image excluding the at least part of the region including the region corresponding to the first coordinate, The second coordinate axis in the second reference axis direction can be calculated in consideration of the distribution period of the target image projected and masked in the second reference axis direction, in the second reference axis direction perpendicular to the first reference axis . In this case, when the minutia is a minutiae, in order to grasp the spatial information on the second reference axis of the minutiae, a projection is made in the direction of a second reference axis perpendicular to the reference axis, and a second boundary Value can be obtained. From this, a second coordinate value corresponding to the midpoint of the section in which the target is projected can be obtained.

The third coordinate calculation unit 325 calculates a coordinate value of the two-dimensional image on the reference plane parallel to the third reference plane perpendicular to the first reference axis with the first coordinate value in the first reference axis direction in the input three- Can be binarized and projected in a third reference axis direction perpendicular to the first and second reference axes to calculate the third coordinates of the feature points. In particular, when the minutiae are at the lower jaw, a third boundary value can be obtained in consideration of the distribution interval of the target with respect to the third reference axis corresponding to the left and right direction when the head is viewed from the front. From this, the third coordinate value can be obtained by calculating the center of the section where the target is projected.

FIG. 2 illustrates details of a second two-dimensional target image acquiring unit 314 in an apparatus 10 for acquiring spatial information of a target included in a three-dimensional radiographic image according to an embodiment of the present invention. Referring to FIG. 1, FIG. 2 will be described as follows.

The second two-dimensional target image acquiring unit 314 includes a second two-dimensional preliminary target image acquiring unit 314a, a first binarizing unit 314b, an area determining unit 314c, a contrast increasing unit 314d, And a second binarization unit 314e. The second two-dimensional target image obtaining unit 314 may receive at least one boundary value from the boundary value determining unit 312 and generate a second two-dimensional image in which the target or the like is located.

The second two-dimensional target image obtaining unit 314a can obtain a second two-dimensional preliminary target image by binarizing the second two-dimensional image with respect to a predetermined first binarization reference value. At this time, the predetermined first binarization reference value may be determined in consideration of the distribution of pixel values of the second two-dimensional image. Especially the strength of the teeth or the bone density.

The region determining unit 314b can determine a region including a target in the binarized two-dimensional image with respect to the first binarization reference value, and the boundary for the region at this time can be determined in advance as a boundary value determination according to the above- And projecting on the determined reference axis.

The contrast enhancement unit 314c may increase the contrast of the determined region in the second two-dimensional image. The region including the target is input from the region determining unit 314b, the region is extracted from the second two-dimensional image, and the contrast of the brightness of the pixel with respect to the extracted region is increased.

The second binarization unit 314d may acquire a second two-dimensional target image by binarizing a predetermined second binarization reference value by receiving the contrast increased region from the contrast increasing unit 314c. At this time, the second binarization reference value can be determined in consideration of the region in which the target exists in the two-dimensional image binarized according to the first binarization reference value and the first binarization reference value. The difference between the first binarization reference value and the second binarization reference value may be determined in consideration of the contrast increased by the contrast increasing unit 314c.

FIG. 3 illustrates a method of acquiring spatial information of a target included in a three-dimensional radiographic image according to an embodiment of the present invention. Referring to FIG. 1, FIG. 3 will be described as follows.

The method of acquiring spatial information of a target according to the present invention includes a step of generating a two-dimensional image (S100), a step of obtaining a two-dimensional target image (S200), and a step of acquiring spatial information of a target (S300) . According to the method of acquiring the spatial information of the target included in the 3D radiation image according to the present invention, spatial information including coordinate information of the target area information or minutiae can be obtained by inputting the 3D image.

The step of generating a two-dimensional image (S100) may generate a two-dimensional image by projecting the input three-dimensional radiation image on a predetermined first reference plane. In this case, a pre-generated three-dimensional image can be retrieved or a newly captured three-dimensional image can be input. The object to be imaged is preferably a head region including a patient's upper and lower parts, And to subjects in need of treatment. At this time, the step of generating a two-dimensional image (S100) may generate a two-dimensional image by projecting the input three-dimensional image on a predetermined first reference plane, and projecting the first three- The brightness information of the tomographic images included in the interval between the reference planes can be integrated.

In this case, the first reference plane may be any one of a sagittal plane, an axial plane, and a coronal plane, and when the target is a tooth, a sagittal plane may be projected as a first reference plane to generate a two-dimensional image.

A step S200 of acquiring a two-dimensional target image can acquire a two-dimensional target image of the target included in the generated two-dimensional image. At this time, the obtained two-dimensional target image can be represented by a binarized image in which the boundary for the target region appears, and the target can be determined in advance for the region requiring spatial information such as teeth, the entire skull, etc. included in the image. The 2D target image can be obtained from the input 2D image through the image processing process. The image processing process takes into account the anatomical structure of the target and uses binomial, hole filling, expansion and image processing techniques such as dilation, thinning, and the like.

The step of acquiring the spatial information of the target (S300) may acquire the spatial information of the target by projecting the target image of the dimension on the predetermined reference axis. The spatial information to be acquired may include at least spatial information on a plurality of boundary surfaces for defining a boundary region in which the target is distributed in the two-dimensional target image of the first reference plane, And may include three-dimensional position coordinates of one feature point.

At this time, projecting on the predetermined reference axis can project the two-dimensional target image in at least one of the first axis in the vertical direction and the second axis in the horizontal direction included in the first reference plane, The axis includes a first reference axis and a second reference axis perpendicular to the first reference axis, and projecting on a predetermined reference axis projects the two-dimensional target image in the direction of the first reference axis, It can be implemented by projecting in the direction of the reference axis.

FIG. 4 illustrates details of a step S300 of acquiring spatial information of a target in a spatial information acquisition method of a target included in a 3D radiographic image according to an exemplary embodiment of the present invention.

The step S300 of acquiring the spatial information of the target according to the present invention includes a step S310 of determining a first boundary value for determining a boundary on which a target is distributed and a step S210 of using a second two- Dimensional target image (S330).

The step S310 of determining the first boundary value defines a boundary in which the target is distributed based on at least one reference axis included in the first reference plane in the projected image obtained by projecting the two-dimensional target image on the predetermined reference axis. Can be determined. In particular, when the target is a tooth, a two-dimensional target image of the tooth may be projected on a predetermined reference axis to obtain a boundary value for defining a bounding box as a boundary of a region where teeth are distributed.

In step S330 of acquiring a second two-dimensional target image using the second two-dimensional image, a second reference plane is determined in consideration of the determined boundary value, and the second reference plane parallel to the determined second reference plane, A second two-dimensional image is generated by integrating the tomographic images reconstructed from the image according to the boundary value, and a second two-dimensional target image can be acquired using the generated second two-dimensional image . At this time, with regard to acquiring the second two-dimensional target image, the details will be described later in Fig.

FIG. 5 illustrates in detail a step S300 of acquiring spatial information of a target in a spatial information acquisition method of a target included in a two-dimensional radiological image according to an exemplary embodiment of the present invention. Specifically, Dimensional position coordinate is obtained.

The step S300 of obtaining the spatial information of the target according to the present invention includes a step S320 of calculating a first coordinate, a step S340 of calculating a second coordinate, and a step S360 of calculating a third coordinate .

The step of calculating the first coordinate (S320) may include projecting the obtained two-dimensional target image on a first reference axis included in the first reference plane to determine a first reference axis direction It is possible to obtain one component of the three-dimensional position coordinates of the feature point. For example, when the minutiae are the patient's lower jaw, a target image is obtained from the generated two-dimensional image with respect to the sagittal plane, and from the one-dimensional information obtained by projecting the target image onto the first reference axis corresponding to the height direction The first coordinate value can be obtained and the information corresponding to the height of the feature point, that is, the vertical direction on the sagittal plane, can be obtained through the first coordinate.

In the step of calculating the second coordinate (S340), masking processing is performed on the obtained region of the two-dimensional target image except for at least a region including the region corresponding to the first coordinate, and the masked- The second coordinate axis in the second reference axis direction can be calculated in consideration of the distribution period of the target image projected and masked in the second reference axis direction have. In this case, if the feature point for which the position coordinate is to be obtained is the lower jaw, the second boundary value can be obtained by projecting in the direction of the second reference axis perpendicular to the reference axis, and considering the distribution range of the target. A second coordinate value corresponding to the middle point of the section in which the target is projected can be obtained therefrom, and the second coordinate can be defined as the coordinate in the horizontal direction on the sagittal plane to obtain the horizontal coordinate value of the lower limit point.

In the step S360 of calculating the third coordinate, in the input three-dimensional radiographic image, the reference coordinate value is calculated in the reference plane parallel to the third reference plane, which has the first coordinate value in the first reference axis direction and is perpendicular to the first reference axis The two-dimensional image may be binarized and the third coordinate of the feature point may be calculated by projecting the two-dimensional image in a direction of a third reference axis perpendicular to the first and second reference axes. In the case where the minutiae are the lower ments, the third boundary value can be obtained in consideration of the distribution interval of the target with respect to the third reference axis corresponding to the left and right direction when the head is viewed from the front. From this, the third coordinate value can be obtained by calculating the center of the section where the target is projected.

FIG. 6 is a detailed view illustrating a step (S330) of generating a second two-dimensional image in a method of acquiring spatial information of a target included in a dimensional radiographic image according to an embodiment of the present invention. The step of generating a second two-dimensional image (S330) generates a second two-dimensional image using the first boundary value determined from the obtained two-dimensional target image, and generates a second two- 2 < / RTI >

The step of generating a second two-dimensional image according to the present invention (S330) includes a step (S331) of acquiring a second two-dimensional target image, a step (S333) of binarizing the first binarization reference value, (S335) and binarizing the second binarization reference value (S337).

In the step S331 of acquiring the second two-dimensional preliminary target image, the generated second two-dimensional image may be binarized to a predetermined first binarization reference value to obtain a second two-dimensional preliminary target image . At this time, the predetermined first binarization reference value may be determined in consideration of the distribution of pixel values of the second two-dimensional image. Especially the strength of the target or the bone density.

In the step S333 of determining the region including the target, the region including the target in the binarized binary image with respect to the first binarization reference value may be determined. At this time, the boundaries for the regions can be obtained by a method of projecting on a predetermined reference axis such as the boundary value determination according to the present invention described above.

The step of increasing contrast (S335) may increase the contrast of the determined region in the second two-dimensional image. At this time, the region including the target may be input, the corresponding region may be extracted from the second two-dimensional image, and the contrast of the brightness of the pixel may be increased with respect to the extracted region.

In step S337 of binarizing the second binarization reference value to acquire a second two-dimensional target image, the second binarized target image is obtained by binarizing the region of increased contrast to a predetermined second binarization reference value can do. At this time, the second binarization reference value can be determined in consideration of the region in which the target exists in the two-dimensional image binarized according to the first binarization reference value and the first binarization reference value. The difference between the first binarization reference value and the second binarization reference value may be determined by considering the increased contrast according to step S335 of increasing the contrast .

FIG. 7 illustrates in detail a step S300 of acquiring spatial information of a target in a spatial information acquisition method of a target included in a three-dimensional radiation image according to an embodiment of the present invention. Referring to FIGS. 1 and 4, the following will be described.

According to an embodiment of the present invention, the step of acquiring the spatial information of the target (S300) includes a step S310 of determining a first boundary value and a step of acquiring a second two- (S350) of determining a third boundary value in step S330 of acquiring the third boundary value. Since the step of determining the first boundary value (S310) and the step of obtaining the second two-dimensional target image using the second two-dimensional image (S330) have been described with reference to FIG. 4, The determination step S350 will be described.

In the step S350 of determining the third boundary value, a binarized region for a predetermined second binarization reference value is defined as a third boundary value for defining a boundary in which the target is distributed based on a reference axis perpendicular to the first reference plane Can be determined. . In this case, the reference axis perpendicular to the first reference plane can be defined as a third reference axis, and the third boundary value defined as the distribution of the target on the third reference axis can be defined to correspond to the width of the target space. In particular, when the target is a tooth, when the head of the patient is viewed from the front, a reference axis corresponding to the left and right direction is defined as a third reference axis,

The calculated third boundary value may correspond to the width of the space in which the tooth is located.

FIG. 8 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention. 1 to 7, the following will be described.

A method of acquiring spatial information of a target included in a 3D radiographic image according to the present invention may include generating a 2D image by projecting a predetermined first reference plane, wherein the first reference plane is a sagittal plane, , An axial surface, and a coronal surface. In the present embodiment, it is assumed that the first reference plane is a sagittal plane, which is a vertically cut section in a state where the head is viewed from the side, and the three-dimensional image input in (a) is projected on the sagittal plane. At this time, it is possible to obtain the projected two-dimensional image (b) by integrating the brightness information of the tomographic images included in the interval between the reference planes parallel to the sagittal plane as the first reference plane.

FIG. 9 illustrates an embodiment of a method of acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention. 1 to 7, the following will be described.

A method of acquiring a spatial information of a target included in a 3D radiological image according to the present invention includes the steps of (a) acquiring a two-dimensional target image of a target A included in the generated two-dimensional image, And projecting the target image onto a predetermined reference axis to obtain (b) the spatial information of the target. At this time, the two-dimensional target image (a) can be obtained through image processing from the two-dimensional image obtained as shown in FIG. 8 (b). Image processing uses information such as anatomical structure, positional relationship, and size of the target and performs image processing such as binarization, filtering, hole filling, line drawing, addition, subtraction, dilation, thinning), and the like.

In this embodiment, it is assumed that the target A is a patient's tooth, and the spatial information to be acquired is depth and height information in a three-dimensional space in which teeth are distributed. At this time, projection on the predetermined reference axis projects the two-dimensional tooth image A in the direction of the first reference axis as shown in (b), projects the two-dimensional target image in the direction of the second reference axis (Second boundary value) and height (first boundary value) as distribution area information on the first reference plane of the target (tooth) through the area B defined by the first boundary value and the second boundary value obtained therefrom, Information can be obtained.

FIG. 10 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention. 1 to 9, the following will be described.

A method of acquiring a spatial information of a target included in a 3D radiological image according to the present invention includes the steps of (a) obtaining a two-dimensional target image of a target included in the generated two-dimensional image, (B) projecting on a predetermined reference axis to obtain spatial information of the target.

In this embodiment, the target is the skull of the patient, and the spatial information to be acquired is a part of the target, assuming that the three-dimensional position coordinate of the lower Menton, which is a minutiae located at the lowest point of the lower front midline of the patient, do. At this time, projecting on a predetermined reference axis projects the two-dimensional target image (a), which is a binarized image, in the direction of the first reference axis as shown in (b) Height (first boundary value) information can be obtained as position coordinate information on the first reference plane of the point.

FIG. 11 shows an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention. 1 to 9, the following will be described.

The method of acquiring the spatial information of the target included in the 3D radiation image according to the present invention uses the obtained spatial information in the process of generating the 2D image from the inputted 3D image to integrate the tomographic images in the limited region It is possible to acquire a two-dimensional image in a section. This can be used to project the acquired two-dimensional image on a predetermined reference axis so as to confine the region in acquiring the one-dimensional boundary value information.

In one embodiment of the present invention, when the target is a tooth of a patient and the spatial information to be acquired is width information in a three-dimensional space in which teeth are distributed, the height information of the obtained tooth as shown in FIG. Dimensional image is projected on the upper surface of the axis in a limited height section of the input three-dimensional image to obtain a two-dimensional image on the upper surface of the tooth. In order to limit the height of the tooth space, The interval of the space to be projected by integration through the value information can be limited to A and B. Also, the second boundary value (depth) information obtained in FIG. 9 may be selectively reflected to acquire a two-dimensional image of a tooth in a more limited region.

FIG. 12 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiation image according to the present invention. 1 to 11, the following will be described.

A method of acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention includes the steps of: determining a second reference plane in consideration of a determined boundary value; determining a tomographic image that is parallel to the determined second reference plane and reconstructed from the three- And a step of obtaining a second two-dimensional target image by using the generated second two-dimensional image.

In the case of this embodiment, it is assumed that the target A is a patient's tooth, the spatial information to be acquired is width information in a three-dimensional space in which teeth are distributed, and the second reference surface serving as a reference of integration is an axial surface. The input three-dimensional image is divided into a distribution section of the target (A) obtained by using the distribution information (first boundary value) on the first reference axis of the target (A) obtained as shown in FIG. 9 11) to generate a second two-dimensional image (a). From the generated second two-dimensional image (a), the second two-dimensional target image (b) can be acquired through image processing.

FIG. 13 shows an embodiment of a method of acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention. 12, which will be described with reference to FIGS. 1 to 12. FIG.

A method for acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention determines a third boundary value for defining a boundary in which the target is distributed with reference to a reference axis perpendicular to the first reference plane . In this embodiment, it is assumed that the target is a patient's tooth. At this time, an axial top two-dimensional image of the tooth obtained and binarized as shown in (a) is projected with respect to a first reference axis which became a reference of projection in FIG. 9 and a third reference axis which is perpendicular to the second reference axis, 3 boundary value can be obtained. The third reference axis corresponds to the left and right direction when the patient's head is viewed from the front, and the third boundary value corresponds to the width of the teeth.

FIG. 14 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiation image according to the present invention. 10, and will be described with reference to FIGS. 1 to 13. FIG.

A method of acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention includes masking a remaining region excluding at least a region including a region corresponding to a first coordinate in a two- The masked target image is projected in the second reference axis direction perpendicular to the first reference axis and the second coordinate axis in the second reference axis direction in consideration of the distribution interval of the masked target image projected in the second reference axis direction And the step of calculating the number of times of the operation.

In this embodiment, it is assumed that the target A is the skull of the patient and the spatial information to be acquired is the position coordinate of the lower jaw as shown in FIG. Masking processing is performed on the remaining area excluding the part of the area C corresponding to the height of the lower jaw in the obtained two-dimensional target image using the height information of the lower jaw obtained as shown in FIG. 10 (b) The processed target image is projected in the second reference axis direction perpendicular to the first reference axis and the center point B of the distribution interval is calculated in consideration of the distribution interval of the target image projected in the second reference axis direction and masked 2 < / RTI > reference axis direction.

FIG. 15 shows an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention. 14, which will be described with reference to FIGS. 1 to 14. FIG.

A method of acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention is a method of acquiring spatial information of a target in a three-dimensional radiation image having a first coordinate value in a first reference axis direction and a third reference plane perpendicular to a first reference axis And a step of binarizing the two-dimensional image on the parallel reference plane and projecting the two-dimensional image in the third reference axis direction perpendicular to the first and second reference axes to calculate the third coordinates of the feature point. In this embodiment, it is assumed that the target A is the skull of the patient, the spatial information to be acquired is the position coordinate of the lower jaw, and the third reference plane is the axially upper surface. At this time, a two-dimensional image corresponding to the height of the lower jaw and parallel to the upper surface of the axis is binarized from the input three-dimensional image, and is projected in the direction of a third reference axis perpendicular to the first and second reference axes, Can be obtained. The third reference axis is the reference axis in the left and right direction when the head is viewed from the front, and the third coordinate is the position information in the left and right direction of the lower point.

FIG. 16 illustrates an embodiment of a spatial information acquisition method of a target included in a three-dimensional radiographic image according to the present invention. The details of FIG. 12 will be described in detail with reference to FIGS. 1 to 12. FIG.

A method of acquiring spatial information of a target included in a 3D radiographic image according to the present invention includes binarizing a generated second 2D image (a) with respect to a predetermined first binarization reference value to generate a second 2D preliminary target And acquiring the image (b). In this embodiment, it is assumed that the target (A, B) is the patient's tooth, and the spatial information to be acquired is the tooth width information. At this time, the first binarization reference value is determined in consideration of the pixel distribution of the second two-dimensional image (a), and may be determined in consideration of the intensity of the target (tooth) or the bone density. The second two-dimensional preliminary target image (b) binarized with respect to the predetermined first binarization reference value roughly shows the region distribution (B) of the target. FIG. 17 illustrates an embodiment of a method for acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention. 16, and will be described with reference to FIGS. 1 to 16. FIG.

A method for acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention includes the steps of: determining a region including a target in a binarized two-dimensional image with respect to a first binarization reference value; It is possible to increase the contrast of the region and to binarize the region with the increased contrast to a predetermined second binarization reference value to obtain a second two-dimensional target image. In this embodiment, the target is the patient's tooth, and the second binarization reference value may be determined in consideration of the first binarization reference value and the region in which the target exists in the binarized two-dimensional region, It can be determined to be a low value. In particular, it can be determined in consideration of the degree of increase in contrast.

In this embodiment, region information in which the target A is distributed is obtained from the second two-dimensional preliminary target image as generated in (a) and FIG. 9, and the second (B) extracts only the corresponding region of the tooth from the two-dimensional image, and increases the contrast of the two-dimensional image of the extracted region. (C) acquiring the second two-dimensional target image to obtain distribution information of the target (B) by binarizing the image with increased contrast with respect to the second binarization reference value.

FIG. 18 shows an embodiment of a method for acquiring spatial information of a target included in a three-dimensional radiographic image according to the present invention. 1 to 17, a projected image is generated on an input three-dimensional image, spatial information is acquired through image processing, and a two-dimensional image is generated from the three-dimensional image by using the acquired spatial information . In this embodiment, the target is the mandible of the patient, and the target image b is binarized in consideration of the bone density of the mandible from the two-dimensional image (a) of the axial top surface generated with respect to the limited height, (C), the coordinates of the mandible can be obtained as shown in Fig. Using the obtained coordinate information of the mandible, a two-dimensional image (d) in which the posterior neck B is removed can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (23)

Generating a two-dimensional image by projecting the input three-dimensional radiation image on a predetermined first reference plane;
Acquiring a two-dimensional target image of the target included in the generated two-dimensional image; And
And projecting the two-dimensional target image on a predetermined reference axis to obtain spatial information of the target. 2. The method of claim 1, wherein projecting onto the first reference plane comprises:
Wherein the brightness information of the tomographic images included in the interval between the reference planes parallel to the first reference plane is integrated with respect to the input three-dimensional image. 2. The apparatus of claim 1, wherein the predetermined reference axis includes a first reference axis and a second reference axis perpendicular to the first reference axis,
Projecting on the predetermined reference axis means,
And projecting the two-dimensional target image in the direction of the first reference axis and projecting the two-dimensional target image in the direction of the second reference axis. Information acquisition method. The method of claim 1, wherein projecting onto a predetermined reference axis comprises:
Dimensional target image is projected in at least one of a first axis in a vertical direction and a second axis in a horizontal direction included in the first reference plane, and acquiring spatial information of the target included in the three- Way. The method according to claim 1,
Wherein the spatial information includes spatial information about a plurality of interfaces for defining a boundary region in which the target is distributed in the two-dimensional target image of the first reference plane. Of acquiring spatial information. The method according to claim 1,
Wherein the first reference surface is one of an axial surface, a sagittal surface, and a tubular surface. 2. The method of claim 1, wherein obtaining spatial information of the target comprises:
Determining a boundary value for defining a boundary on which the target is distributed based on at least one reference axis included in the first reference plane in a projected image obtained by projecting the two-dimensional target image on a predetermined reference axis;
Determining a second reference plane in consideration of the determined boundary value, generating a second two-dimensional image by integrating tomographic images parallel to the determined second reference plane and reconstructed from the three-dimensional radiographic image, according to the boundary value Acquiring a second two-dimensional target image using the generated second two-dimensional image; And generating a three-dimensional radiographic image of the target. The method according to claim 1,
Wherein the spatial information includes three-dimensional position coordinates of at least one feature point included in the obtained two-dimensional target image. 2. The method of claim 1, wherein obtaining spatial information of the target comprises:
Calculating a first coordinate in a first reference axis direction for at least one feature point included in the target image by projecting the obtained two-dimensional target image on a first reference axis included in the first reference plane;
And masking the remaining region excluding at least a region including the region corresponding to the first coordinate in the obtained two-dimensional target image, and outputting the masked target image to a second And calculating a second coordinate in the second reference axis direction by considering the distribution period of the target image projected in the reference axis direction and projected and masked in the second reference axis direction. A method for acquiring spatial information of a target included in a radiological image. 10. The method of claim 9,
Dimensional image on a reference plane parallel to a third reference plane perpendicular to the first reference axis with the first coordinate value in the first reference axis direction in the input three dimensional radiographic image, And calculating a third coordinate of the feature point by projecting the feature point in a third reference axis direction perpendicular to the second reference axis. The method according to claim 1,
The feature point may be at least one of Menton, Gnathion, Nasion, Orbitale, A point, B point, and Gonion Wherein the image reconstructing method comprises: The method according to claim 1,
Wherein the target is a crown of a portion of a tooth. 8. The method of claim 7, wherein acquiring the second two-
Acquiring a second two-dimensional preliminary target image by binarizing the generated second two-dimensional image with respect to a predetermined first binarization reference value;
Determining a region including the target in the binarized two-dimensional image with respect to the first binarization reference value;
Increasing a contrast of the determined region in the second two-dimensional image;
Acquiring a second two-dimensional target image by binarizing the contrast-increased region with respect to a predetermined second binarization reference value;
And generating a three-dimensional radiographic image of the target. 8. The method of claim 7,
And determining a third boundary value for defining a boundary in which the target is distributed based on a reference axis perpendicular to the first reference plane with respect to the predetermined second reference value for binarization, And acquiring the spatial information of the target included in the three-dimensional radiographic image. 14. The method of claim 13,
Wherein the first binarization reference value is determined in consideration of a distribution of pixel values of the second two-dimensional image,
Wherein the second binarization reference value is determined in consideration of the region in which the target exists in the two-dimensional image binarized according to the first binarization reference value and the first binarization reference value. Method of acquiring spatial information. 14. The method of claim 13,
Wherein the second binarization reference value is determined to be not greater than the first binarization reference value. A two-dimensional image generation unit for generating a two-dimensional image by projecting the input three-dimensional radiation image on a predetermined first reference plane;
A target image acquiring unit for acquiring a two-dimensional target image of a target included in the generated two-dimensional image; And
And a spatial information obtaining unit for obtaining the spatial information of the target by projecting the two-dimensional target image on a predetermined reference axis. 18. The apparatus of claim 17,
Dimensional target image is projected on a predetermined reference axis to determine a boundary value for defining a boundary on which the target is distributed with reference to at least one reference axis included in the first reference plane, A boundary value determination unit;
Determining a second reference plane in consideration of the determined boundary value, and generating a second two-dimensional image by integrating tomographic images parallel to the determined second reference plane and reconstructed from the three-dimensional radiographic image, according to the boundary value A second two-dimensional image generating unit; Wherein the spatial information acquiring unit acquires the spatial information of the target included in the 3D radiation image. 19. The apparatus of claim 18, wherein the second two-
A second two-dimensional pre-target image acquiring unit for acquiring a second two-dimensional target image by binarizing the generated second two-dimensional image with respect to a predetermined first binarization reference value;
An area determination unit for determining an area including the target in the binarized two-dimensional image with respect to the first binarization reference value;
A contrast increasing unit for increasing the contrast of the determined area in the second two-dimensional image;
And a second binarization unit for binarizing the region having the increased contrast to a predetermined second binarization reference value. 19. The method of claim 18,
And a third boundary value determiner for determining a third boundary value for defining a boundary on which the target is distributed based on a reference axis perpendicular to the first reference plane with respect to the second two- Wherein the spatial information acquiring unit acquires the spatial information of the target included in the 3D radiation image. 18. The apparatus of claim 17,
Dimensional target image on a first reference axis included in the first reference plane to calculate a first coordinate in a first reference axis direction with respect to at least one minutiae included in the target image, Calculating section;
And masking the remaining region excluding at least a region including the region corresponding to the first coordinate in the obtained two-dimensional target image, and outputting the masked target image to a second And a second coordinate calculator for calculating a second coordinate in the second reference axis direction in consideration of the distribution interval of the target image projected in the reference axis direction and projected in the second reference axis direction and masked Wherein the target spatial information acquisition device is included in the 3D radiation image. 22. The method of claim 21,
Dimensional image on a reference plane parallel to a third reference plane perpendicular to the first reference axis with the first coordinate value in the first reference axis direction in the input three dimensional radiographic image, And a third coordinate calculation unit for calculating a third coordinate of the minutiae by projecting the third spatial information in a third reference axis direction perpendicular to the second reference axis, Acquisition device. A computer-readable recording medium,
A computer-readable recording medium recording a program for causing a computer to execute the method according to any one of claims 1 to 16.

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