CN114037787A - Method and system for generating skull positive position image and lateral position image based on CBCT image - Google Patents
Method and system for generating skull positive position image and lateral position image based on CBCT image Download PDFInfo
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Abstract
The invention provides a method and a system for generating a skull positive position image and a lateral position image based on a CBCT image, wherein the method comprises the following steps: acquiring image data of a target skull through CBCT; importing an image reconstruction algorithm; obtaining a three-dimensional image of the target skull according to an image reconstruction algorithm and image data; obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image; and obtaining a lateral position image and a positive position image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image. The invention can effectively avoid the phenomenon of bone tissue overlapping in the alignment image and the lateral image of the target skull, thereby improving the quality of the lateral image and the alignment image of the target skull, reducing the positioning requirement on the target skull through CBCT sampling, avoiding secondary scanning of the target and avoiding bringing additional radiation to the target.
Description
Technical Field
The invention relates to the technical field of CBCT image processing, in particular to a method for generating a skull positive image and a skull lateral image based on a CBCT image and a system for generating the skull positive image and the skull lateral image based on the CBCT image.
Background
Currently, lateral and orthostatic cranial imaging is performed by irradiating the skull of a patient with X-rays from the side or front to obtain structural images of the skull at lateral and orthostatic positions. However, the structural image obtained by this method is generally a two-dimensional projection image, and in this two-dimensional projection image, there is a phenomenon in which a tooth overlaps with a bone tissue such as a tooth or a tooth and a spine, and a skull mark point is not distinguishable.
In addition, the current lateral and orthostatic imaging have higher requirements on the positioning of the skull of the patient, and particularly, the lateral imaging is often influenced by the overlapping of multiple teeth and bones, so that the skull of the patient is easily placed at an accurate position, but the obtained image is unusable, and therefore, the data needs to be acquired again for the patient, and extra and unnecessary radiation dose is brought to the patient.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, an object of the present invention is to provide a method for generating a cranial orthophoria image and a lateral image based on a CBCT image, which can effectively avoid the phenomenon of bone tissue overlapping in the cranial orthophoria image and the lateral image of a target, thereby improving the quality of the lateral image and the orthophoria image of the target, and can also reduce the positioning requirement on the target skull by CBCT sampling, avoid secondary scanning of the target, and thereby avoid additional radiation to the target.
A second object of the present invention is to provide a system for generating cranial orthophoria and lateral images based on CBCT images.
In order to achieve the above object, a first embodiment of the present invention provides a method for generating a cranial orthophoria image and a lateral image based on CBCT images, comprising the following steps: acquiring image data of a target skull through CBCT; importing an image reconstruction algorithm; obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data; obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image; and obtaining a lateral position image and a positive position image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image.
According to the method for generating the cranial orthophoria image and the lateral position image based on the CBCT image provided by the embodiment of the invention, acquiring image data of the target skull by CBCT, importing an image reconstruction algorithm, obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data, then obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image, finally obtaining a lateral position image and a positive position image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image, therefore, the phenomenon of bone tissue overlapping in the target skull positive image and the lateral image can be effectively avoided, therefore, the quality of the lateral position image and the normal position image of the target skull can be improved, the positioning requirement on the target skull can be reduced through CBCT sampling, secondary scanning of the target is avoided, and extra radiation brought to the target can be avoided.
In addition, the method for generating the cranial orthophoria image and the lateral position image based on the CBCT image according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the target skull is imaged multiple times by the CBCT to acquire image data of different regions of the target skull.
According to one embodiment of the invention, the CBCT performs multiple imaging sessions of the target skull with overlapping vertical portions of each imaging session.
According to one embodiment of the invention, obtaining a three-dimensional image of the target skull from the image data comprises: selecting an image reconstruction algorithm; obtaining three-dimensional images of different areas of the target skull according to the image reconstruction algorithm and the image data of different areas of the target skull; and registering and splicing the three-dimensional images of different areas of the target skull through the images of the overlapped part to obtain the three-dimensional image of the target skull.
According to one embodiment of the invention, the soft tissue image and the bone tissue image of the target skull are obtained by performing image segmentation on the three-dimensional image of the target skull.
According to an embodiment of the present invention, obtaining a lateral image of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image comprises: determining a lateral projection baseline of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image; setting side position sampling points according to the side position projection base line; setting a side position projection direction according to the side position sampling point; and calculating image value integration according to the lateral projection direction to obtain a lateral image of the target skull.
According to one embodiment of the invention, the lateral position image of the target skull includes a left position image and a right position image.
According to an embodiment of the present invention, obtaining an orthostatic image of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image comprises: determining an orthonormal projection baseline of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image; setting a normal sampling point according to the normal projection baseline; setting a normal projection direction according to the normal sampling point; and calculating image value integration according to the orthostatic projection direction to obtain an orthostatic image of the target skull.
In order to achieve the above object, a second embodiment of the present invention provides a system for generating a cranial orthophoria image and a lateral image based on CBCT images, comprising: an image acquisition module for acquiring image data of a target skull, wherein the image data is a CBCT image of the target skull; the image reconstruction module comprises an image reconstruction algorithm and is used for obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data; an image segmentation module for obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image; a lateral image generation module for obtaining a lateral image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image; a correction image generation module for obtaining a correction image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image.
According to the system for generating the skull positive position image and the lateral position image based on the CBCT image, which is provided by the embodiment of the invention, the CBCT image data of the target skull is obtained through the image acquisition module, the three-dimensional image of the target skull is obtained through the image reconstruction module according to the imported image reconstruction algorithm and the CBCT image data, the soft tissue image and the bone tissue image of the target skull are obtained through the image segmentation module according to the three-dimensional image, and the lateral position image and the positive position image of the target skull are obtained through the lateral position image generation module and the positive position image generation module according to the soft tissue image, the bone tissue image and the three-dimensional image, so that the bone tissue overlapping phenomenon in the positive position image and the lateral position image of the target skull can be effectively avoided, the quality of the lateral position image and the positive position image of the target skull can be improved, and the positioning requirement on the target skull can be reduced through the CBCT sampling, the secondary scanning of the target is avoided, so that additional radiation brought to the target can be avoided.
In addition, the system for generating the cranial orthophoria image and the lateral position image based on the CBCT image according to the above embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the invention, the image acquisition module is a CBCT that images the target skull a plurality of times to acquire image data of different regions of the target skull.
Drawings
FIG. 1 is a flow chart of a method for generating a cranial orthopaedics image and a lateral position image based on a CBCT image according to an embodiment of the present invention;
FIG. 2(a) is a schematic projection diagram of a left position of a target skull according to an embodiment of the present invention;
FIG. 2(b) is a diagram of the projection result corresponding to the left position of the target skull according to an embodiment of the present invention;
FIG. 3(a) is a schematic projection diagram of a right side of a target skull according to an embodiment of the present invention;
FIG. 3(b) is a diagram of the projection results corresponding to the right position of the target skull, in accordance with one embodiment of the present invention;
FIG. 4(a) is a schematic projection diagram of a target cranial alignment according to an embodiment of the present invention;
FIG. 4(b) is a diagram of the projection results corresponding to the target cranial correction according to one embodiment of the present invention;
FIG. 5 is a block diagram of a system for generating cranial elevation and lateral images based on CBCT images in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flow chart of a method for generating a cranial orthopaedics image and a lateral position image based on a CBCT image according to an embodiment of the present invention.
As shown in FIG. 1, the method for generating the cranial orthophoria image and the lateral position image based on the CBCT image of the embodiment of the invention comprises the following steps:
s1, image data of the target skull is acquired by CBCT.
In one embodiment of the invention, the target skull may be imaged multiple times by CBCT to acquire image data of different regions of the target skull, with each imaging interval having overlapping portions in the vertical direction. The CBCT can perform circular motion around the target skull to acquire image data of the target skull at various angles, so that the positioning requirement on the target skull can be reduced.
S2, an image reconstruction algorithm is introduced.
In one embodiment of the present invention, the image reconstruction algorithm may be an FDK algorithm. It should be noted that the selection of the image reconstruction algorithm is not exclusive, and in other embodiments of the present invention, other image reconstruction algorithms may also be selected, for example, the image reconstruction algorithm may also be an image reconstruction iterative algorithm or an AI reconstruction algorithm.
And S3, obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data.
Specifically, the step S3 may include: obtaining three-dimensional images of different areas of the target skull according to an image reconstruction algorithm and image data of different areas of the target skull; and registering and splicing the three-dimensional images of different areas of the target skull through the images of the overlapped part to obtain the three-dimensional image of the target skull.
And S4, obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image.
In one embodiment of the present invention, image segmentation may be performed on a three-dimensional image of a target skull to obtain a soft tissue image and a bone tissue image of the target skull. Specifically, the soft tissue structure and the bone tissue structure in the three-dimensional image of the target skull can be distinguished according to the gray distribution and the prior knowledge of the three-dimensional image of the target skull to obtain the soft tissue image and the bone tissue image of the target skull.
By distinguishing the soft tissue structure and the bone tissue structure in the three-dimensional image of the target skull, unnecessary structures in the three-dimensional image of the target skull can be removed conveniently according to clinical requirements, in addition, the contrast of the soft tissue image can be improved by displaying the soft tissue structure and the bone tissue structure in a distinguishing manner, and the identification of the mark points of the soft tissue, such as the tip of the nose and the chin, can be facilitated.
And S5, obtaining a lateral image and a positive image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image.
In one embodiment of the present invention, a lateral image of the target skull may be obtained from the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, a lateral projection baseline of the target skull can be determined according to the soft tissue image, the bone tissue image and the three-dimensional image, a lateral sampling point can be set according to the lateral projection baseline, then a lateral projection direction can be set according to the lateral sampling point, and finally an image value integral can be calculated according to the lateral projection direction to obtain a lateral image of the target skull. Wherein the lateral position image of the target skull comprises a left position image and a right position image.
In one embodiment of the present invention, a left lateral image of the target skull may be obtained from the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, a left side position projection baseline of the target skull can be determined according to the soft tissue image, the bone tissue image and the three-dimensional image, a left side position sampling point can be set according to the left side position projection baseline, then a left side position projection direction can be set according to the left side position sampling point, and finally, an image value integral can be calculated according to the left side position projection direction to obtain a left side position image of the target skull.
More specifically, a target skull image containing teeth and spinal structures may be selected from the soft tissue image, the bone tissue image, and the three-dimensional image of the target skull, and the cross section of the target skull image is intercepted, so that the projection schematic diagram of the target skull shown in figure 2(a) can be obtained, then, a vertical straight line at the center of the anterior teeth of the tooth shown in fig. 2(a) can be selected as a left projection baseline of the target skull, and further, the left side position sampling points can be equidistantly arranged on the left side position projection base line, the perpendicular line direction of the tangent line of each left side position sampling point on the left side position projection base line can be used as the left side position projection direction of the target skull, finally, the image value integral can be calculated along the left side position projection direction from the left side position sampling points shown in fig. 2(a), and therefore the left side position image of the target skull shown in fig. 2(b) can be obtained.
It should be noted that the shapes of the projection baseline, for example, the lateral projection baseline and the normal projection baseline in the above embodiments of the present invention are not unique, and in other embodiments of the present invention, the projection baseline may be set to other shapes according to actual needs, for example, the projection baseline may be set to be a curve according to actual needs; similarly, in the above embodiment of the present invention, the setting manners of the sampling points on the projection baseline, for example, the side sampling points and the positive sampling points, are not unique, and in other embodiments of the present invention, the setting manners of the sampling points on the projection baseline may also be changed according to actual needs, for example, the sampling points may also be set on the projection baseline in a non-equidistant manner according to actual needs.
In one embodiment of the present invention, a right lateral image of the target skull may be obtained from the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, a right side projection baseline of the target skull may be determined from the soft tissue image, the bone tissue image, and the three-dimensional image; setting a right side sampling point according to the right side projection baseline; setting a right side projection direction according to the right side sampling point; and calculating image value integration according to the right bit projection direction to obtain a right bit image of the target skull.
More specifically, a target skull image containing teeth and spinal structures may be selected from the soft tissue image, the bone tissue image, and the three-dimensional image of the target skull, and the cross section of the target skull image is intercepted, so that the projection schematic diagram of the target skull shown in figure 3(a) can be obtained, the vertical straight line at the center of the anterior teeth shown in fig. 3(a) may then be selected as the right lateral projection baseline for the target skull, and further, right side sampling points can be equidistantly arranged on the right side projection baseline, the perpendicular direction of the tangent of each right side sampling point on the right side projection baseline can be used as the right side projection direction of the target skull, and finally, image value integration can be calculated from the right side sampling points shown in fig. 3(a) along the right side projection direction, so that the right side image of the target skull shown in fig. 3(b) can be obtained.
It should be noted that, in the process of obtaining the lateral image of the target skull, the image value integrals are calculated along the lateral projection direction, that is, the left image value integrals of the target skull are calculated along the left projection direction and the right image value integrals of the target skull are calculated along the right projection direction, so that the left and right bone tissue structures of the target skull can be ensured to correspond to the left image and the right image of the target skull, the overlapping of the left and right bone tissue structures of the target skull is avoided, and the clearer tooth structure and the skull mark point can be obtained.
In one embodiment of the present invention, an orthostatic image of the target skull may be derived from the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, an orthostatic projection baseline of the target skull may be determined from the soft tissue image, the bone tissue image, and the three-dimensional image; setting a normal sampling point according to a normal projection baseline; setting a normal projection direction according to the normal sampling point; and calculating image value integration according to the orthostatic projection direction to obtain an orthostatic image of the target skull.
More specifically, a target skull image containing teeth and a spine structure can be selected from the soft tissue image, the bone tissue image and the three-dimensional image of the target skull, the cross section of the target skull image is cut, the target skull projection diagram shown in fig. 4(a) can be obtained, then the central horizontal line of the target skull shown in fig. 4(a) can be selected as an orthotopic projection baseline of the target skull, furthermore, orthotopic sampling points can be equidistantly arranged on the orthotopic projection baseline, the perpendicular direction of the tangent line of each orthotopic sampling point on the orthotopic projection baseline can be used as the orthotopic projection direction of the target skull, and finally, the orthotopic image of the target skull shown in fig. 4(b) can be obtained by starting from the orthotopic sampling points shown in fig. 4(a) and calculating the image value integral along the orthotopic projection direction.
In addition, a target skull image containing teeth and a spine structure can be selected from the soft tissue image, the bone tissue image and the three-dimensional image of the target skull, the cross section of the target skull image is intercepted, then a curve which is parallel to a dental arch curve in the target skull and is positioned between the teeth and the spine can be selected as an orthostatic projection base line, furthermore, orthostatic sampling points can be equidistantly arranged on the orthostatic projection base line, the perpendicular direction of the tangent line of each orthostatic sampling point on the orthostatic projection base line can be used as the orthostatic projection direction of the target skull, finally, the orthostatic sampling points can be started, and the image value integral can be calculated along the orthostatic projection direction, so that the orthostatic image of the target skull can be obtained. The orthostatic projection direction is perpendicular to the dental arch curve, so that the overlapping probability between teeth can be reduced, and a clearer tooth structure and skull mark points can be obtained.
It should be noted that, in the process of obtaining the lateral position image and the normal position image of the target skull, the length of the image value integration may be changed according to the clinical requirement, for example, the length of the image value integration may be shortened to reduce the possibility of overlapping between tissue structures in the target skull, thereby avoiding displaying unnecessary structures. In addition, in the process of obtaining the lateral position image and the positive position image of the target skull, the spine interval of the target skull is avoided in the image value integration process, so that a clearer tooth structure and skull mark points can be obtained.
According to the method for generating the cranial orthophoria image and the lateral position image based on the CBCT image provided by the embodiment of the invention, acquiring image data of the target skull by CBCT, importing an image reconstruction algorithm, obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data, then obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image, finally obtaining a lateral position image and a positive position image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image, therefore, the phenomenon of bone tissue overlapping in the target skull positive image and the lateral image can be effectively avoided, therefore, the quality of the lateral position image and the normal position image of the target skull can be improved, the positioning requirement on the target skull can be reduced through CBCT sampling, secondary scanning of the target is avoided, and extra radiation brought to the target can be avoided.
In order to realize the method for generating the cranial correction image and the lateral position image based on the CBCT image in the embodiment, the invention also provides a system for generating the cranial correction image and the lateral position image based on the CBCT image.
FIG. 5 is a block diagram of a system for generating a cranial elevation image and a lateral image based on CBCT images according to an embodiment of the present invention.
As shown in fig. 5, the system for generating a cranial orthophoria image and a lateral image based on a CBCT image according to an embodiment of the present invention includes an image acquisition module 10, an image reconstruction module 20, an image segmentation module 30, a lateral image generation module 40, and an orthophoria image generation module 50. The image acquisition module 10 may be configured to acquire image data of a target skull, where the image data is a CBCT image of the target skull; the image reconstruction module 20 comprises an image reconstruction algorithm, and the image reconstruction module 20 can be used for obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data; the image segmentation module 30 may be configured to obtain a soft tissue image and a bone tissue image of the target skull from the three-dimensional image; the lateral image generating module 40 may be configured to obtain a lateral image of the target skull according to the soft tissue image, the bone tissue image, and the three-dimensional image; the orthostatic image generation module 50 may be configured to obtain an orthostatic image of the target skull based on the soft tissue image, the bone tissue image, and the three-dimensional image.
In one embodiment of the present invention, the image acquisition module 10 may be a CBCT that may image the target skull a plurality of times to acquire image data of different regions of the target skull, with each imaging interval having overlapping portions in the vertical direction. The CBCT can perform circular motion around the target skull to acquire image data of the target skull at various angles, so that the positioning requirement on the target skull can be reduced.
In one embodiment of the present invention, the image reconstruction algorithm included in the image reconstruction module 20 may be an FDK algorithm. It should be noted that the selection of the image reconstruction algorithm is not exclusive, and in other embodiments of the present invention, other image reconstruction algorithms may also be selected, for example, the image reconstruction algorithm may also be an image reconstruction iterative algorithm or an AI reconstruction algorithm.
Specifically, the image segmentation module 30 may be configured to obtain three-dimensional images of different regions of the target skull according to an image reconstruction algorithm, such as the FDK algorithm, and image data of different regions of the target skull, and may perform registration and stitching on the three-dimensional images of different regions of the target skull through the overlapped images to obtain a three-dimensional image of the target skull.
In one embodiment of the present invention, the image segmentation module 30 may be specifically configured to perform image segmentation on a three-dimensional image of a target skull to obtain a soft tissue image and a bone tissue image of the target skull. More specifically, the image segmentation module 30 may be configured to distinguish the soft tissue structure and the bone tissue structure in the three-dimensional image of the target skull according to the gray distribution of the three-dimensional image of the target skull and the prior knowledge, so as to obtain the soft tissue image and the bone tissue image of the target skull.
By distinguishing the soft tissue structure and the bone tissue structure in the three-dimensional image of the target skull, unnecessary structures in the three-dimensional image of the target skull can be removed conveniently according to clinical requirements, in addition, the contrast of the soft tissue image can be improved by displaying the soft tissue structure and the bone tissue structure in a distinguishing manner, and the identification of the mark points of the soft tissue, such as the tip of the nose and the chin, can be facilitated.
In an embodiment of the present invention, the lateral image generating module 40 may be specifically configured to determine a lateral projection baseline of the target skull according to the soft tissue image, the bone tissue image, and the three-dimensional image, set a lateral sampling point according to the lateral projection baseline, set a lateral projection direction according to the lateral sampling point, and finally calculate an image value integral according to the lateral projection direction to obtain a lateral image of the target skull. Wherein the lateral position image of the target skull comprises a left position image and a right position image.
In one embodiment of the present invention, lateral image generation module 40 may be configured to obtain a left lateral image of the target skull based on the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, the lateral image generating module 40 may determine a left lateral projection baseline of the target skull according to the soft tissue image, the bone tissue image, and the three-dimensional image, set a left lateral sampling point according to the left lateral projection baseline, set a left lateral projection direction according to the left lateral sampling point, and finally calculate an image value integral according to the left lateral projection direction to obtain a left lateral image of the target skull.
More specifically, lateral image generation module 40 may select a target skull image containing teeth and spinal structures from the soft tissue image, the bone tissue image and the three-dimensional image of the target skull, and the cross section of the target skull image is intercepted, so that the projection schematic diagram of the target skull shown in figure 2(a) can be obtained, then, a vertical straight line at the center of the anterior teeth of the tooth shown in fig. 2(a) can be selected as a left projection baseline of the target skull, and further, the left side position sampling points can be equidistantly arranged on the left side position projection base line, the perpendicular line direction of the tangent line of each left side position sampling point on the left side position projection base line can be used as the left side position projection direction of the target skull, finally, the image value integral can be calculated along the left side position projection direction from the left side position sampling points shown in fig. 2(a), and therefore the left side position image of the target skull shown in fig. 2(b) can be obtained.
In one embodiment of the present invention, lateral image generation module 40 may be configured to obtain a right lateral image of the target skull based on the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, the lateral image generating module 40 may determine a right lateral projection baseline of the target skull according to the soft tissue image, the bone tissue image, and the three-dimensional image, may set a right lateral sampling point according to the right lateral projection baseline, and may then set a right lateral projection direction according to the right lateral sampling point; and calculating image value integration according to the right bit projection direction to obtain a right bit image of the target skull.
More specifically, lateral image generation module 40 may select a target skull image containing teeth and spinal structures from the soft tissue image, the bone tissue image and the three-dimensional image of the target skull, and the cross section of the target skull image is intercepted, so that the projection schematic diagram of the target skull shown in figure 3(a) can be obtained, the vertical straight line at the center of the anterior teeth shown in fig. 3(a) may then be selected as the right lateral projection baseline for the target skull, and further, right side sampling points can be equidistantly arranged on the right side projection baseline, the perpendicular direction of the tangent of each right side sampling point on the right side projection baseline can be used as the right side projection direction of the target skull, and finally, image value integration can be calculated from the right side sampling points shown in fig. 3(a) along the right side projection direction, so that the right side image of the target skull shown in fig. 3(b) can be obtained.
It should be noted that, in the process of obtaining the lateral image of the target skull, the lateral image generation module 40 calculates the image value integral along the lateral projection direction, that is, calculates the left image value integral of the target skull along the left projection direction and calculates the right image value integral of the target skull along the right projection direction, so as to ensure that the left and right bone tissue structures of the target skull correspond to the left image and the right image of the target skull, respectively, avoid overlapping of the left and right bone tissue structures of the target skull, and obtain clearer tooth structures and skull landmark points.
In one embodiment of the present invention, the orthostatic image generation module 50 may be used to obtain an orthostatic image of the target skull based on the soft tissue image, the bone tissue image, and the three-dimensional image. Specifically, the orthostatic image generating module 50 may determine an orthostatic projection baseline of the target skull according to the soft tissue image, the bone tissue image, and the three-dimensional image, set an orthostatic sampling point according to the orthostatic projection baseline, set an orthostatic projection direction according to the orthostatic sampling point, and then calculate an image value integral according to the orthostatic projection direction to obtain an orthostatic image of the target skull.
More specifically, the orthostatic image generating module 50 may select a target skull image including teeth and a spine structure from the soft tissue image, the bone tissue image, and the three-dimensional image of the target skull, and intercept a cross section of the target skull image, so as to obtain a target skull projection diagram shown in fig. 4(a), then may select a central horizontal line of the target skull shown in fig. 4(a) as an orthostatic projection baseline of the target skull, further may set orthostatic sampling points equidistantly on the orthostatic projection baseline, and may use a perpendicular direction of a tangent line of each orthostatic sampling point on the orthostatic projection baseline as an orthostatic projection direction of the target skull, and finally may calculate an image value integral along the orthostatic projection direction from the orthostatic sampling points shown in fig. 4(a), so as to obtain an orthostatic image of the target skull shown in fig. 4 (b).
In another embodiment of the present invention, the orthostatic image generating module 50 may further select a target skull image containing teeth and spine structures from the soft tissue image, the bone tissue image and the three-dimensional image of the target skull, intercept a cross section of the target skull image, then select a curve in the target skull parallel to the dental arch curve and located between the teeth and the spine as an orthostatic projection baseline, further, orthostatic sampling points may be equidistantly set on the orthostatic projection baseline, the perpendicular direction of the tangent line of each orthostatic sampling point on the orthostatic projection baseline may be used as the orthostatic projection direction of the target skull, and finally, starting from the orthostatic sampling points, the image value integral may be calculated along the orthostatic projection direction, thereby obtaining the orthostatic image of the target skull. The orthostatic projection direction is perpendicular to the dental arch curve, so that the overlapping probability between teeth can be reduced, and a clearer tooth structure and skull mark points can be obtained.
It should be noted that, during the process of obtaining the lateral position image and the posture image of the target skull, the posture image generating module 50 may change the length of the image value integration according to the clinical requirement, for example, the length of the image value integration may be shortened to reduce the possibility of overlapping between tissue structures in the target skull, thereby avoiding displaying unnecessary structures. In addition, in the process of obtaining the lateral position image and the positive position image of the target skull, the spine interval of the target skull is avoided in the image value integration process, so that a clearer tooth structure and skull mark points can be obtained.
According to the system for generating the skull positive position image and the lateral position image based on the CBCT image, which is provided by the embodiment of the invention, the CBCT image data of the target skull is obtained through the image acquisition module, the three-dimensional image of the target skull is obtained through the image reconstruction module according to the imported image reconstruction algorithm and the CBCT image data, the soft tissue image and the bone tissue image of the target skull are obtained through the image segmentation module according to the three-dimensional image, and the lateral position image and the positive position image of the target skull are obtained through the lateral position image generation module and the positive position image generation module according to the soft tissue image, the bone tissue image and the three-dimensional image, so that the bone tissue overlapping phenomenon in the positive position image and the lateral position image of the target skull can be effectively avoided, the quality of the lateral position image and the positive position image of the target skull can be improved, and the positioning requirement on the target skull can be reduced through the CBCT sampling, the secondary scanning of the target is avoided, so that additional radiation brought to the target can be avoided.
In the description of the present specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for generating a cranial orthopaedics image and a lateral image based on a CBCT image, comprising the steps of:
acquiring image data of a target skull through CBCT;
importing an image reconstruction algorithm;
obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data;
obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image;
and obtaining a lateral position image and a positive position image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image.
2. The method for generating cranial orthophoria and lateral images based on CBCT images according to claim 1, wherein the target skull is imaged multiple times by the CBCT to acquire image data of different regions of the target skull.
3. The method for generating cranial orthophoria and lateral images based on CBCT images as in claim 2, wherein the CBCT images the target skull with overlapping vertical portions for each imaging interval over a plurality of imaging sessions.
4. The method for generating a cranial orthophoria image and a lateral image based on a CBCT image according to claim 3, wherein deriving a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data comprises:
obtaining three-dimensional images of different areas of the target skull according to the image reconstruction algorithm and the image data of different areas of the target skull;
and registering and splicing the three-dimensional images of different areas of the target skull through the images of the overlapped part to obtain the three-dimensional image of the target skull.
5. The method for generating cranial orthophoria and lateral images based on CBCT images according to claim 4, wherein the soft tissue image and bone tissue image of the target skull are obtained by image segmentation of the three-dimensional image of the target skull.
6. The method for generating a cranial orthophoria image and a lateral image based on a CBCT image according to claim 5, wherein deriving a lateral image of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image comprises:
determining a lateral projection baseline of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image;
setting side position sampling points according to the side position projection base line;
setting a side position projection direction according to the side position sampling point;
and calculating image value integration according to the lateral projection direction to obtain a lateral image of the target skull.
7. The method for generating a cranial positioning image and a lateral positioning image based on a CBCT image according to claim 6, wherein the lateral positioning image of the target skull comprises a left side positioning image and a right side positioning image.
8. The method for generating a cranial stereotactic image and a lateral image based on a CBCT image according to claim 5, wherein obtaining a stereotactic image of the target skull from the soft tissue image, the bone tissue image and the three-dimensional image comprises:
determining an orthonormal projection baseline of the target skull from the soft tissue image, the bone tissue image, and the three-dimensional image;
setting a normal sampling point according to the normal projection baseline;
setting a normal projection direction according to the normal sampling point;
and calculating image value integration according to the orthostatic projection direction to obtain an orthostatic image of the target skull.
9. A system for generating a cranial orthopaedics image and a lateral image based on a CBCT image, comprising:
an image acquisition module for acquiring image data of a target skull, wherein the image data is a CBCT image of the target skull;
the image reconstruction module comprises an image reconstruction algorithm and is used for obtaining a three-dimensional image of the target skull according to the image reconstruction algorithm and the image data;
an image segmentation module for obtaining a soft tissue image and a bone tissue image of the target skull according to the three-dimensional image;
a lateral image generation module for obtaining a lateral image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image;
a correction image generation module for obtaining a correction image of the target skull according to the soft tissue image, the bone tissue image and the three-dimensional image.
10. The system for generating cranial orthopaedics and lateral imagery based on CBCT images according to claim 9, wherein the image acquisition module is CBCT, the CBCT imaging the target skull a plurality of times to acquire image data of different regions of the target skull.
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