CN113288198A - Fast low-dose oral CBCT imaging method and system - Google Patents
Fast low-dose oral CBCT imaging method and system Download PDFInfo
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Abstract
The invention provides a rapid low-dose oral CBCT imaging method and a system, wherein the method comprises the following steps: acquiring normal and lateral projection images of the skull; determining an imaging target area according to the normal projection image and the lateral projection image; determining a scanning track and a scanning frequency according to the imaging requirement of an imaging target area; acquiring image data of an imaging target area according to the scanning track and the scanning frequency; and obtaining a three-dimensional image of the imaging target area according to the image data. The invention can ensure the image resolution, shorten the scanning moving distance and reduce the scanning frequency, thereby reducing the scanning time, reducing the radiation dose and effectively reducing the probability of motion artifacts.
Description
Technical Field
The invention relates to the technical field of CBCT imaging, in particular to a rapid low-dose oral CBCT imaging method and a rapid low-dose oral CBCT imaging system.
Background
At present, in oral cavity CBCT scanning, in order to obtain an image meeting the diagnosis requirement of a dentist, an X-ray light source moves for a circle along a circular orbit, even if the image required by the doctor is only a local interval in the oral cavity of the patient, that is, several hundreds to thousands of images need to be acquired by one oral cavity CBCT scanning, and the acquisition time of one oral cavity CBCT reaches dozens of seconds due to the physical limitation of the current dynamic flat panel detector, during the period, a large amount of radiation is caused to the patient, and the probability of motion artifacts caused by the breathing or head swing of the patient is increased.
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, the invention aims to provide a fast low-dose oral CBCT imaging method, which can ensure the resolution of an image, shorten the scanning moving distance and reduce the scanning frequency, thereby reducing the scanning time, reducing the radiation dose and effectively reducing the probability of occurrence of motion artifacts.
A second object of the present invention is to provide a fast low-dose oral CBCT imaging system.
In order to achieve the above object, a first aspect of the present invention provides a fast low-dose oral CBCT imaging method, including the following steps: acquiring normal and lateral projection images of the skull; determining an imaging target area according to the normal projection image and the lateral projection image; determining a scanning track and a scanning frequency according to the imaging requirement of the imaging target area; acquiring image data of the imaging target area according to the scanning track and the scanning frequency; and obtaining a three-dimensional image of the imaging target area according to the image data.
According to the rapid low-dose oral CBCT imaging method provided by the embodiment of the invention, the imaging target area is determined, the scanning track and the scanning frequency are optimized according to the imaging requirement of the imaging target area to acquire the image data of the imaging target area, and finally the three-dimensional image of the imaging target area is obtained according to the image data, so that the scanning moving distance and the scanning frequency can be shortened while the image resolution is ensured, the scanning time and the radiation dose can be reduced, and the probability of motion artifacts can be effectively reduced.
In addition, the fast low-dose oral CBCT imaging method proposed by the above embodiment of the present invention may also have the following additional technical features:
according to an embodiment of the invention, the orthographic projection image and the lateral projection image are two-dimensional images.
According to an embodiment of the present invention, determining an imaging target region according to the normal projection image and the lateral projection image specifically includes: selecting a first target area in the orthographic projection image, wherein the first target area covers the projection of a target object on the orthographic projection image; selecting a second target area in the lateral projection image, wherein the second target area covers the projection of the target object on the lateral projection image; an imaging target region containing the target object is determined in three-dimensional space by the first target region and the second target region.
According to one embodiment of the invention, the imaging requirements include imaging resolution, imaging size, and imaging contrast.
According to an embodiment of the present invention, determining a scanning trajectory and a scanning frequency according to an imaging requirement of the imaging target area specifically includes: determining the scanning track according to the imaging resolution; determining the scanning frequency according to the imaging size and the imaging contrast.
According to an embodiment of the present invention, obtaining a three-dimensional image of the imaging target region according to the image data specifically includes: correcting the image data; and constructing a three-dimensional image of the imaging target area according to the corrected image data by adopting an iterative image reconstruction algorithm.
In order to achieve the above object, a second embodiment of the present invention provides a fast low-dose oral CBCT imaging system, comprising: a first acquisition module for acquiring orthostatic and lateral projection images of a skull; the first imaging module is used for determining an imaging target area according to the normal projection image and the lateral projection image; the processing module is used for determining a scanning track and a scanning frequency according to the imaging requirement of the imaging target area; the second acquisition module is used for acquiring image data of the imaging target area according to the scanning track and the scanning frequency; and the second imaging module is used for obtaining a three-dimensional image of the imaging target area according to the image data.
According to the rapid low-dose oral CBCT imaging system provided by the embodiment of the invention, the imaging target area is determined, the scanning track and the scanning frequency are optimized according to the imaging requirement of the imaging target area to acquire the image data of the imaging target area, and finally the three-dimensional image of the imaging target area is obtained according to the image data, so that the scanning moving distance and the scanning frequency can be shortened while the image resolution is ensured, the scanning time and the radiation dose can be reduced, and the probability of motion artifacts can be effectively reduced.
In addition, the fast low-dose oral CBCT imaging system proposed according to the above embodiment of the present invention may also have the following additional technical features:
according to an embodiment of the invention, the orthographic projection image and the lateral projection image are two-dimensional images.
According to an embodiment of the invention, the first imaging module is specifically configured to: selecting a first target region containing a target object in the orthographic projection image; selecting a second target area containing the target object in the lateral projection image; an imaging target region containing the target object is determined in three-dimensional space by the first target region and the second target region.
According to one embodiment of the invention, the imaging requirements include imaging resolution, imaging size, and imaging contrast.
Drawings
FIG. 1 is a flow chart of a method of rapid low-dose oral CBCT imaging according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of determining an imaging target area in accordance with one embodiment of the present invention;
FIG. 3 is a schematic view of a target area being scanned by a scanning trajectory in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a curved line segment of a motion trajectory of an X-ray light source according to an embodiment of the present invention;
fig. 5 is a block diagram of a fast low-dose oral CBCT imaging system according to 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 flowchart of a fast low-dose oral CBCT imaging method according to an embodiment of the present invention.
As shown in fig. 1, the fast low-dose oral CBCT imaging method according to the embodiment of the present invention includes the following steps:
s1, acquiring right and side projection images of the skull.
In one embodiment of the invention, the cranial elevation and lateral projection images may be acquired by CBCT, wherein both the elevation and lateral projection images of the skull are two-dimensional images.
S2, an imaging target area is determined according to the normal projection image and the lateral projection image.
Specifically, a first target region may be selected in the orthographic projection image, wherein the first target region covers a projection of the target object on the orthographic projection image, and a second target region may be selected in the lateral projection image, wherein the second target region covers a projection of the target object on the lateral projection image, and then an imaging target region including the target object may be determined in the three-dimensional space by the first target region and the second target region.
More specifically, as shown in fig. 2, a first target region, for example, a rectangular region b, may be selected in the orthographic projection image a, and the rectangular region b may cover a target object, for example, a projection of a local oral area on the orthographic projection image a, and a second target region, for example, a rectangular region d, may be selected in the lateral projection image c, and the rectangular region d may cover a projection of a target object, for example, a local oral area on the lateral projection image c, and then an imaging target region, for example, a rectangular parallelepiped e, containing a target object, for example, a local oral area, may be formed in a three-dimensional space based on the rectangular region b and the rectangular region d.
And S3, determining the scanning track and the scanning frequency according to the imaging requirement of the imaging target area.
In particular, imaging requirements may include imaging resolution, imaging size, and imaging contrast.
More specifically, the step S3 may include: determining a scanning track according to the imaging resolution; the scanning frequency is determined according to the imaging size and the imaging contrast.
It should be noted that, when the CBCT adopted by the present invention scans the target object, the X-ray source and the detector are fixed at two ends of the CBCT robot arm, and the rotation shaft of the robot arm can be fixed in a slide rail to move back and forth along one direction, so that if the rotation shaft of the robot arm is fixed during rotation, the scanning trajectory can be determined, that is, the movement trajectory of the X-ray source can be a circular trajectory. However, in the present invention, in order to ensure that the imaging resolution of the imaging target area is optimal, it is necessary to make the projection on the sub-detector of the imaging target area maximum and not truncated, and therefore, it is necessary to set different magnifications at each scanning angle, so that the projection of the imaging target area can completely cover the detector, and the rotating shaft of the robot arm can move back and forth according to the magnifications of each scanning angle, for example, as shown in fig. 3, when the X-ray source is located at the scanning angle of S1, the rotating shaft of the robot arm can be located at the point O1, so that the projection of the imaging target area e can completely cover the detector, and when the X-ray source is located at the scanning angle of S2, the rotating shaft of the robot arm can be moved to the point O2, so that the scanning trajectory, that is the movement trajectory of the X-ray source is not a circular trajectory, for example, an elliptical trajectory h as shown in fig. 3.
It should be further noted that after the scanning trajectory of the imaging target area, i.e. the motion trajectory of the X-ray light source, is determined, the scanning trajectory of the imaging target area, i.e. the starting point and the ending point of the motion trajectory of the X-ray light source, also needs to be determined. It should be understood that, for any point in the imaging target area, a straight line passing through the point may intersect the motion trajectory of the X-ray light source, and the set of these intersection points may form a segment of the motion trajectory curve of the X-ray light source, such as the solid line n shown in fig. 4, and the intersection point of the straight line l and the motion trajectory of the X-ray light source, i.e., S3 and S4, may be defined as the starting point and the end point of the X-ray light source scanning, respectively. By selecting the moving distance of the X-ray light source, the scanning time can be reduced.
In addition, it should be noted that the scanning frequency may be set by determining the scanning angle interval according to the requirements of the imaging target area for the imaging size and the imaging contrast, and specifically, the imaging target area may be divided into three categories according to the requirements of the imaging target area for the imaging size and the imaging contrast: in the first type, an imaging target area is local oral cavity imaging with small volume and small contrast; in the second type, the imaging target area is local oral cavity imaging with small volume and large contrast; in the third category, the imaging target area is a large volume but low contrast local oral imaging. The first type of imaging requires more image data and can set the scanning angle interval to be smaller to increase the scanning frequency, while the third type of imaging requires less image data and can set the scanning angle interval to be larger to decrease the scanning frequency. By changing the scanning frequency, the radiation dose of the whole scanning can be effectively reduced under the condition that the radiation dose of each scanning angle is fixed.
And S4, acquiring image data of the imaging target area according to the scanning track and the scanning frequency.
For example, as shown in fig. 4, the scanning of the imaging target area e may be started from the starting point S3, and the image data acquisition of the imaging target area e is completed by the scanning trajectory curve segment n shown by the solid line reaching the ending point S4.
And S5, obtaining a three-dimensional image of the imaging target area according to the image data.
Specifically, the image data may be corrected and then an iterative image reconstruction algorithm may be employed to construct a three-dimensional image of the imaging target region from the corrected image data.
According to the rapid low-dose oral CBCT imaging method provided by the embodiment of the invention, the imaging target area is determined, the scanning track and the scanning frequency are optimized according to the imaging requirement of the imaging target area to acquire the image data of the imaging target area, and finally the three-dimensional image of the imaging target area is obtained according to the image data, so that the scanning moving distance and the scanning frequency can be shortened while the image resolution is ensured, the scanning time and the radiation dose can be reduced, and the probability of motion artifacts can be effectively reduced.
The invention further provides a rapid low-dose oral CBCT imaging system corresponding to the embodiment.
As shown in fig. 5, the fast low-dose oral CBCT imaging system of the embodiment of the present invention includes a first acquisition module 10, a first imaging module 20, a processing module 30, a second acquisition module 40, and a second imaging module 50. Wherein, the first acquisition module 10 is used for acquiring the right and side projection images of the skull; the first imaging module 20 is used for determining an imaging target area according to the normal projection image and the lateral projection image; the processing module 30 is used for determining a scanning track and a scanning frequency according to the imaging requirement of the imaging target area; the second acquisition module 40 is used for acquiring image data of the imaging target area according to the scanning track and the scanning frequency; the second imaging module 50 is configured to obtain a three-dimensional image of the imaging target area according to the image data.
In one embodiment of the present invention, the first acquisition module 10 may acquire cranial elevation and lateral projection images by CBCT, wherein the elevation and lateral projection images of the skull are both two-dimensional images.
In one embodiment of the present invention, the first imaging module 20 may be configured to select a first target region in the orthographic projection image, wherein the first target region covers a projection of the target object on the orthographic projection image, and may select a second target region in the lateral projection image, wherein the second target region covers a projection of the target object on the lateral projection image, and then an imaging target region containing the target object may be determined in the three-dimensional space by the first target region and the second target region.
More specifically, the first imaging module 20 may be configured to select a first target area, for example, a rectangular area b shown in fig. 2, in the orthographic projection image a, and the rectangular area b may cover the target object, for example, the projection of the local oral area on the orthographic projection image a, and select a second target area, for example, a rectangular area d, in the lateral projection image c, and the rectangular area d may cover the target object, for example, the projection of the local oral area on the lateral projection image c, and then form an imaging target area, i.e., a rectangular parallelepiped e, containing the target object, for example, the local oral area, in the three-dimensional space according to the rectangular area b and the rectangular area d.
In one embodiment of the present invention, the imaging requirements may include an imaging resolution, an imaging size, and an imaging contrast, and the processing module 30 may be configured to determine the scan trajectory based on the imaging resolution and determine the scan frequency based on the imaging size and the imaging contrast.
It should be noted that, when the CBCT adopted by the present invention scans the target object, the X-ray source and the detector are fixed at two ends of the CBCT robot arm, and the rotation shaft of the robot arm can be fixed in a slide rail to move back and forth along one direction, so that if the rotation shaft of the robot arm is fixed during rotation, the scanning trajectory can be determined, that is, the movement trajectory of the X-ray source can be a circular trajectory. However, in the present invention, in order to ensure that the imaging resolution of the imaging target area is optimal, it is necessary to make the projection on the sub-detector of the imaging target area maximum and not truncated, and therefore, it is necessary to set different magnifications at each scanning angle, so that the projection of the imaging target area can completely cover the detector, and the rotating shaft of the robot arm can move back and forth according to the magnifications of each scanning angle, for example, as shown in fig. 3, when the X-ray source is located at the scanning angle of S1, the rotating shaft of the robot arm can be located at the point O1, so that the projection of the imaging target area e can completely cover the detector, and when the X-ray source is located at the scanning angle of S2, the rotating shaft of the robot arm can be moved to the point O2, so that the scanning trajectory, that is the movement trajectory of the X-ray source is not a circular trajectory, for example, an elliptical trajectory h as shown in fig. 3.
It should be further noted that, after determining the scanning trajectory of the imaging target area, i.e. the motion trajectory of the X-ray light source, the processing module 30 also needs to determine the scanning trajectory of the imaging target area, i.e. the starting point and the ending point of the motion trajectory of the X-ray light source. It should be understood that, for any point in the imaging target area, a straight line passing through the point may intersect the motion trajectory of the X-ray light source, and the set of these intersection points may form a segment of the motion trajectory curve of the X-ray light source, such as the solid line n shown in fig. 4, and the intersection point of the straight line l and the motion trajectory of the X-ray light source, i.e., S3 and S4, may be defined as the starting point and the end point of the X-ray light source scanning, respectively. By selecting the moving distance of the X-ray light source, the scanning time can be reduced.
In addition, it should be noted that the processing module 30 may determine the scanning angle interval according to the requirements of the imaging target area for the imaging size and the imaging contrast to set the scanning frequency, and specifically may divide the imaging target area into three categories according to the requirements of the imaging target area for the imaging size and the imaging contrast: in the first type, an imaging target area is local oral cavity imaging with small volume and small contrast; in the second type, the imaging target area is local oral cavity imaging with small volume and large contrast; in the third category, the imaging target area is a large volume but low contrast local oral imaging. The first type of imaging requires more image data and can set the scanning angle interval to be smaller to increase the scanning frequency, while the third type of imaging requires less image data and can set the scanning angle interval to be larger to decrease the scanning frequency. By changing the scanning frequency, the radiation dose of the whole scanning can be effectively reduced under the condition that the radiation dose of each scanning angle is fixed.
In an embodiment of the present invention, the second acquisition module 40 may acquire image data of the imaging target area according to the scanning track and the scanning frequency, for example, as shown in fig. 4, the imaging target area e may be scanned from the starting point S3, and the image data acquisition of the imaging target area e is completed by the scanning track curve segment n shown by the solid line reaching the ending point S4.
In one embodiment of the present invention, the second imaging module 50 may correct the image data and may then employ an iterative image reconstruction algorithm to construct a three-dimensional image of the imaging target region from the corrected image data.
According to the rapid low-dose oral CBCT imaging system provided by the embodiment of the invention, the imaging target area is determined, the scanning track and the scanning frequency are optimized according to the imaging requirement of the imaging target area to acquire the image data of the imaging target area, and finally the three-dimensional image of the imaging target area is obtained according to the image data, so that the scanning moving distance and the scanning frequency can be shortened while the image resolution is ensured, the scanning time and the radiation dose can be reduced, and the probability of motion artifacts can be effectively reduced.
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 present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
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.
Claims (10)
1. A fast low dose oral CBCT imaging method comprising the steps of:
acquiring normal and lateral projection images of the skull;
determining an imaging target area according to the normal projection image and the lateral projection image;
determining a scanning track and a scanning frequency according to the imaging requirement of the imaging target area;
acquiring image data of the imaging target area according to the scanning track and the scanning frequency;
and obtaining a three-dimensional image of the imaging target area according to the image data.
2. The fast low-dose oral CBCT imaging method according to claim 1, wherein said orthographic projection image and said lateral projection image are two-dimensional images.
3. The fast low-dose oral CBCT imaging method according to claim 2, wherein determining an imaging target region from the orthographic projection image and the lateral projection image comprises:
selecting a first target area in the orthographic projection image, wherein the first target area covers the projection of a target object on the orthographic projection image;
selecting a second target area in the lateral projection image, wherein the second target area covers the projection of the target object on the lateral projection image;
an imaging target region containing the target object is determined in three-dimensional space by the first target region and the second target region.
4. The fast low-dose oral CBCT imaging method according to claim 3, wherein said imaging requirements include imaging resolution, imaging size and imaging contrast.
5. The fast low-dose oral CBCT imaging method of claim 4, wherein determining a scan trajectory and a scan frequency according to the imaging requirements of the imaging target region comprises:
determining the scanning track according to the imaging resolution;
determining the scanning frequency according to the imaging size and the imaging contrast.
6. The fast low-dose oral CBCT imaging method of claim 5, wherein obtaining a three-dimensional image of said imaging target region from said image data, comprises:
correcting the image data;
and constructing a three-dimensional image of the imaging target area according to the corrected image data by adopting an iterative image reconstruction algorithm.
7. A fast low dose oral CBCT imaging system, comprising:
a first acquisition module for acquiring orthostatic and lateral projection images of a skull;
the first imaging module is used for determining an imaging target area according to the normal projection image and the lateral projection image;
the processing module is used for determining a scanning track and a scanning frequency according to the imaging requirement of the imaging target area;
the second acquisition module is used for acquiring image data of the imaging target area according to the scanning track and the scanning frequency;
and the second imaging module is used for obtaining a three-dimensional image of the imaging target area according to the image data.
8. The fast low-dose oral CBCT imaging system of claim 7, wherein said orthographic projection image and said lateral projection image are two-dimensional images.
9. The fast low-dose oral CBCT imaging system of claim 8, wherein the first imaging module is specifically configured to:
selecting a first target region containing a target object in the orthographic projection image;
selecting a second target area containing the target object in the lateral projection image;
an imaging target region containing the target object is determined in three-dimensional space by the first target region and the second target region.
10. The fast low-dose oral CBCT imaging system of claim 9, wherein the imaging requirements include imaging resolution, imaging size, and imaging contrast.
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