Oral panoramic imaging method and system

Abstract

The present invention provides a method and system for panoramic oral imaging, comprising the following steps: inputting a dental arch curve type of a patient to be examined; determining a motion trajectory and speed based on the dental arch curve type; acquiring oral projection data of the patient to be examined based on the motion trajectory and speed; constructing an arch surface based on the dental arch curve type, wherein sampling points are provided on the dental arch surface; determining the projection position of each sampling point based on the motion trajectory; and constructing a panoramic image of the dental arch surface based on the oral projection data and the projection position of each sampling point. The present invention can obtain a multi-layer panoramic oral image using oral projection data collected in a single scan, wherein the multi-layer panoramic oral image is composed of dental arch surfaces at different positions, thereby effectively reducing overlap of soft tissue and bone tissue in the multi-layer panoramic oral image.

Description

Technical Field

[0001] The present invention relates to the technical field of oral cavity imaging, and in particular to an oral cavity panoramic imaging method and an oral cavity panoramic imaging system. Background Art

[0002] Oral panoramic imaging is a specialized X-ray examination of the skull and maxillofacial area. Panoramic radiographs utilize three-axis fixed, continuously shifted arcuate tomography, designed to take into account the anatomical characteristics of the oral and maxillofacial area, such as bilateral symmetry and the arched shape of the mandibular dental arch. They simultaneously visualize the maxillary and mandibular bones, teeth, and temporomandibular joints, providing a panoramic view of the oral and maxillofacial system, thereby aiding in accurate diagnosis and treatment. However, current panoramic radiographs have limitations. They display only a single image, and overlapping soft tissue and bone tissue in different locations can affect visualization. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides an oral panoramic imaging method, which can obtain a multi-layer oral panoramic image through the oral projection data collected by a single scan. The multi-layer oral panoramic image is composed of dental arch surfaces at different positions, thereby effectively reducing the overlap of soft tissue and bone tissue on the multi-layer oral panoramic image.

[0004] The technical solution adopted in the present invention is as follows:

[0005] A method for panoramic oral imaging comprises the following steps: inputting a dental arch curve type of a patient to be detected; determining a motion trajectory and a motion speed according to the dental arch curve type; acquiring oral projection data of the patient to be detected according to the motion trajectory and the motion speed; constructing a dental arch surface according to the dental arch curve type, wherein sampling points are provided on the dental arch surface; determining a projection position of each sampling point according to the motion trajectory; and constructing a panoramic image of the dental arch surface according to the oral projection data and the projection position of each sampling point.

[0006] According to one embodiment of the present invention, the oral panoramic imaging method further includes the following steps: moving the dental arch surface to obtain a secondary dental arch surface, wherein secondary sampling points are provided on the dental arch surface; determining the projection position of each of the secondary sampling points according to the motion trajectory; and constructing a panoramic image of the secondary dental arch surface according to the oral projection data and the projection position of each of the secondary sampling points.

[0007] According to one embodiment of the present invention, the dental arch curve types include: a Class I dental arch curve, wherein the dental arch width interval of the Class I dental arch curve is (0, 50] mm; a Class II dental arch curve, wherein the dental arch width interval of the Class II dental arch curve is (50, 60] mm; a Class III dental arch curve, wherein the dental arch width interval of the Class III dental arch curve is (60, 70] mm; and a Class IV dental arch curve, wherein the dental arch width interval of the Class IV dental arch curve is (70, +∞) mm.

[0008] According to one embodiment of the present invention, determining the motion trajectory and motion speed according to the dental arch curve type specifically includes the following steps: determining the imaging requirements of the dental arch curve type, wherein the imaging requirements include imaging resolution and imaging radiation; determining the motion trajectory according to the imaging resolution; determining the motion speed according to the motion trajectory and the imaging radiation.

[0009] According to one embodiment of the present invention, constructing a dental arch surface according to the dental arch curve type specifically includes the following steps: moving the dental arch curve of the type up and down to obtain a corresponding dental arch surface, and evenly setting the sampling points on the dental arch surface.

[0010] According to an embodiment of the present invention, determining the projection position of each sampling point according to the motion trajectory specifically includes the following steps: determining all acquisition positions of each sampling point according to the motion trajectory; and calculating the projection position of each sampling point according to the acquisition positions.

[0011] An oral panoramic imaging system comprises: an input module, the input module being used to input a dental arch curve type of a patient to be detected; a first processing module, the first processing module being used to determine a motion trajectory and a motion speed based on the dental arch curve type; an acquisition module, the acquisition module being used to acquire oral projection data of the patient to be detected based on the motion trajectory and the motion speed; a first construction module, the first construction module being used to construct a dental arch surface based on the dental arch curve type, wherein sampling points are provided on the dental arch surface; a second processing module, the second processing module being used to determine a projection position of each sampling point based on the motion trajectory; and a second construction module, the second construction module being used to construct a panoramic image of the dental arch surface based on the oral projection data and the projection position of each sampling point.

[0012] According to one embodiment of the present invention, the oral panoramic imaging system further includes: a third construction module, which is used to move the dental arch surface to obtain a secondary dental arch surface, wherein secondary sampling points are provided on the dental arch surface; a third processing module, which is used to determine the projection position of each of the secondary sampling points according to the motion trajectory; and a fourth construction module, which is used to construct a panoramic image of the secondary dental arch surface based on the oral projection data and the projection position of each of the secondary sampling points.

[0013] According to one embodiment of the present invention, the dental arch curve types include: a Class I dental arch curve, wherein the dental arch width interval of the Class I dental arch curve is (0, 50] mm; a Class II dental arch curve, wherein the dental arch width interval of the Class II dental arch curve is (50, 60] mm; a Class III dental arch curve, wherein the dental arch width interval of the Class III dental arch curve is (60, 70] mm; and a Class IV dental arch curve, wherein the dental arch width interval of the Class IV dental arch curve is (70, +∞) mm.

[0014] According to one embodiment of the present invention, the first processing module is specifically used to determine the imaging requirements of the dental arch curve type, wherein the imaging requirements include imaging resolution and imaging radiation, the motion trajectory is determined according to the imaging resolution, and the motion speed is determined according to the motion trajectory and the imaging radiation.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention can obtain a multi-layer panoramic image of the oral cavity through the oral projection data collected by a single scan, and the multi-layer panoramic image of the oral cavity is composed of dental arch surfaces at different positions, thereby effectively reducing the overlap of soft tissue and bone tissue on the multi-layer panoramic image of the oral cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of a method for oral panoramic imaging according to an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of different types of dental arch curves according to an embodiment of the present invention;

[0019] FIG3( a ) is a schematic diagram of the motion trajectory of the X-ray light source and detector corresponding to the sampling point P1 according to an embodiment of the present invention;

[0020] FIG3( b ) is a schematic diagram of the motion trajectory of the X-ray light source and detector corresponding to the sampling point P2 according to an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of a dental arch curved surface according to an embodiment of the present invention;

[0022] Figure 5 This is a flow chart of a method for panoramic oral imaging according to an embodiment of the present invention;

[0023] Figure 6 A multi-layer panoramic image of an oral cavity according to an embodiment of the present invention;

[0024] Figure 7 Schematic block diagram of an oral panoramic imaging device according to an embodiment of the present invention;

[0025] Figure 8 Schematic diagram of a block diagram of an oral panoramic imaging device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Figure 1 Flowchart of a method for panoramic oral imaging according to an embodiment of the present invention.

[0028] like Figure 1 As shown, the oral panoramic imaging method according to an embodiment of the present invention includes the following steps:

[0029] S1, input the dental arch curve type of the patient to be tested.

[0030] Specifically, the type of dental arch curve of the patient to be tested can be determined according to the dental arch width and input, wherein, Figure 2 As shown, the dental arch curve types may include Class I dental arch curve, Class II dental arch curve, Class III dental arch curve and Class IV dental arch curve, and the dental arch width interval of Class I dental arch curve is (0, 50] mm, the dental arch width interval of Class II dental arch curve is (50, 60] mm, the dental arch width interval of Class III dental arch curve is (60, 70] mm, and the dental arch width interval of Class IV dental arch curve is (70, +∞) mm.

[0031] S2, determine the movement trajectory and movement speed according to the dental arch curve type.

[0032] Specifically, the imaging requirements of the dental arch curve type may be determined first, wherein the imaging requirements include imaging resolution and imaging radiation, and the motion trajectory may be determined according to the imaging resolution, and then the motion speed may be determined according to the motion trajectory and imaging radiation.

[0033] It should be noted that the motion trajectory and motion speed are the operating parameters of the oral CT machine used to collect oral projection data of the patient to be tested in the subsequent step S3, and specifically can be the motion trajectory and motion speed parameters of the X-ray light source and detector of the oral CT machine.

[0034] Specifically, the X-ray light source and detector of the oral CT machine used in the present invention are fixed at both ends of the oral CT robot arm, and the rotation axis of the robot arm can be fixed in a slide rail and move back and forth in a single direction. Therefore, if the robot arm keeps the rotation axis fixed during rotation, a scanning trajectory can be determined, that is, the motion trajectory of the X-ray light source can be a circular trajectory. However, in the present invention, as shown in Figures 3(a) and 3(b), to ensure similar magnification at each angle, the rotation axis will move back and forth along the slide rail, i.e., YY', while the robot arm rotates. This causes the X-ray light sources, i.e., S1 and S2, and the detectors, i.e., D1 and D2, to move along non-circular trajectories. This non-circular trajectory is the motion trajectory of the X-ray light source and detector of the oral CT machine. Because different types of dental arch curves have different shapes, different motion trajectories can be obtained for different types of dental arch curves.

[0035] More specifically, as shown in FIG3(a) and FIG3(b), in the present invention, in order to ensure that the magnification of each angle is similar, for example, the magnification of the angle α1 in FIG3(a) and the magnification of the angle α2 in FIG3(b) are similar, that is, The X-ray source and detector move along a non-circular trajectory, where S1 and D1 are the positions of the X-ray source and detector corresponding to the angle α1, and S2 and D2 are the positions of the X-ray source and detector corresponding to the angle α2. is the magnification of point P1 of this type of dental arch curve, Magnification of point P2 of the dental arch curve.

[0036] Furthermore, after determining the motion trajectory of this type of dental arch curve, in order to ensure that the amount of radiation received by each point on this type of dental arch curve is the same, that is, to ensure that the radiation time received by each point on this type of dental arch curve is the same, the movement speed of the X-ray light source and detector of the oral CT machine can be determined according to the motion trajectory of the X-ray light source and detector of the oral CT machine and the amount of radiation received by each point on this type of dental arch curve, that is, the radiation time.

[0037] S3, collecting oral projection data of the patient to be tested according to the motion trajectory and motion speed.

[0038] Specifically, an oral CT machine may be used to collect oral projection data of the patient to be tested according to the motion trajectory and motion speed determined in step S2 above, and the collection of oral projection data only needs to be performed once.

[0039] S4, constructing a dental arch surface according to the dental arch curve type, wherein sampling points are set on the dental arch surface.

[0040] Specifically, if Figure 4 As shown, the dental arch surface of this type of dental arch curve can be obtained by moving the dental arch curve of this type up and down, and sampling points can be evenly set on the dental arch surface.

[0041] S5, determining the projection position of each sampling point according to the motion trajectory.

[0042] Specifically, all acquisition positions of each sampling point are determined according to the motion trajectory, and the projection position of each sampling point can be calculated according to the acquisition positions.

[0043] Among them, the sampling point can be specifically P(x, y, z), and all the collection positions of the sampling point are the positions S1(x1, y1, z1), S2(x2, y2, z2), ..., Sn(xn, yn, zn) of all X-ray light sources that can collect the sampling point P(x, y, z) on the motion trajectory of the corresponding dental arch surface, and the corresponding detector positions D1(x1, y1, z1), D2(x2, y2, z2), ..., Dn(xn, yn, zn), wherein the number n of X-ray light sources may change with the position of the sampling point.

[0044] Furthermore, the projection position of each sampling point on the detector can be calculated based on each sampling point and its acquisition position, ie, the positions of all X-ray light sources that can acquire the sample point and the position of the corresponding detector.

[0045] S6, constructing a panoramic image of the dental arch surface based on the oral projection data and the projection position of each sampling point.

[0046] Specifically, based on the projection position of each sampling point, i.e., its projection position on the detector, the corresponding detector value can be obtained from the oral projection data. This is the image value of the sampling point projected on the detector, such as V1, V2, ..., Vn. Furthermore, based on the distribution of the image values, m image values ​​can be selected and their average value calculated as the pixel value of the panoramic image of the dental arch surface, thereby constructing the panoramic image of the dental arch surface. Here, m varies with the position of the sampling point and is specifically determined by the detector width and the motion trajectory of the X-ray light source.

[0047] Furthermore, if Figure 5 As shown, the oral panoramic imaging method according to the embodiment of the present invention further includes the following steps:

[0048] S7, moving the dental arch surface to obtain a secondary dental arch surface, wherein secondary sampling points are set on the dental arch surface.

[0049] Specifically, the dental arch surface obtained in step S4 can be moved back and forth to obtain a secondary dental arch surface, and secondary sampling points can be evenly set on the secondary dental arch surface.

[0050] S8, determining the projection position of each secondary sampling point according to the motion trajectory.

[0051] S9, constructing a panoramic image of the secondary dental arch surface based on the oral projection data and the projection position of each secondary sampling point.

[0052] Specifically, the implementation process of the above steps S8-S9 can refer to the above steps S5-S6, thereby obtaining a panoramic image of the secondary dental arch surface.

[0053] Furthermore, by repeating the above steps S7-S9, a plurality of panoramic images of dental arch surfaces can be obtained. Thus, corresponding panoramic images can be obtained on different dental arch surfaces through the oral projection data collected by a single scan, for example Figure 6 The oral multi-layer panoramic image shown, and through Figure 6 It can be seen that for dental arch surfaces at different positions, the overlap of soft tissues and bone tissues at different positions will also be different.

[0054] Furthermore, for the oral multi-layer panoramic image obtained in the above embodiment, image processing tools can be used to adjust the grayscale value distribution of the image and optimize the image contrast to improve the image resolution and reduce the image noise.

[0055] According to the oral panoramic imaging method proposed in an embodiment of the present invention, a multi-layer oral panoramic image can be obtained by collecting oral projection data through a single scan, and the oral multi-layer panoramic image is composed of dental arch surfaces at different positions, thereby effectively reducing the overlap of soft tissue and bone tissue on the oral multi-layer panoramic image.

[0056] Corresponding to the oral panoramic imaging method proposed in the above embodiment, the present invention also proposes an oral panoramic imaging system.

[0057] like Figure 7As shown, the oral panoramic imaging system of an embodiment of the present invention includes an input module 10, a first processing module 20, an acquisition module 30, a first construction module 40, a second processing module 50, and a second construction module 60. The input module 10 is used to input the dental arch curve type of the patient to be examined; the first processing module 20 is used to determine the motion trajectory and motion speed based on the dental arch curve type; the acquisition module 30 is used to collect oral projection data of the patient to be examined based on the motion trajectory and motion speed; the first construction module 40 is used to construct a dental arch surface based on the dental arch curve type, wherein sampling points are provided on the dental arch surface; the second processing module 50 is used to determine the projection position of each sampling point based on the motion trajectory; and the second construction module 60 is used to construct a panoramic image of the dental arch surface based on the oral projection data and the projection position of each sampling point.

[0058] In one embodiment of the present invention, the input module 10 can determine the type of dental arch curve of the patient to be tested according to the dental arch width and input the type of dental arch curve, wherein, Figure 2 As shown, the dental arch curve types may include Class I dental arch curve, Class II dental arch curve, Class III dental arch curve and Class IV dental arch curve, and the dental arch width interval of Class I dental arch curve is (0, 50] mm, the dental arch width interval of Class II dental arch curve is (50, 60] mm, the dental arch width interval of Class III dental arch curve is (60, 70] mm, and the dental arch width interval of Class IV dental arch curve is (70, +∞) mm.

[0059] In one embodiment of the present invention, the first processing module 20 may first determine the imaging requirements of the dental arch curve type, wherein the imaging requirements include imaging resolution and imaging radiation, and may determine the motion trajectory based on the imaging resolution, and then may determine the motion speed based on the motion trajectory and imaging radiation.

[0060] It should be noted that the motion trajectory and motion speed may be operating parameters of the acquisition module 30 , ie, the oral CT machine, and specifically may be the motion trajectory and motion speed parameters of the X-ray light source and detector of the oral CT machine.

[0061] Specifically, the X-ray light source and detector of the oral CT machine used in the present invention are fixed at both ends of the oral CT robot arm, and the rotation axis of the robot arm can be fixed in a slide rail and move back and forth in a single direction. Therefore, if the robot arm keeps the rotation axis fixed during rotation, a scanning trajectory can be determined, that is, the motion trajectory of the X-ray light source can be a circular trajectory. However, in the present invention, as shown in Figures 3(a) and 3(b), to ensure similar magnification at each angle, the rotation axis will move back and forth along the slide rail, i.e., YY', while the robot arm rotates. This causes the X-ray light sources, i.e., S1 and S2, and the detectors, i.e., D1 and D2, to move along non-circular trajectories. This non-circular trajectory is the motion trajectory of the X-ray light source and detector of the oral CT machine. Because different types of dental arch curves have different shapes, different motion trajectories can be obtained for different types of dental arch curves.

[0062] More specifically, as shown in FIG3(a) and FIG3(b), in the present invention, in order to ensure that the magnification of each angle is similar, for example, the magnification of the angle α1 in FIG3(a) and the magnification of the angle α2 in FIG3(b) are similar, that is, The X-ray source and detector move along a non-circular trajectory, where S1 and D1 are the positions of the X-ray source and detector corresponding to the angle α1, and S2 and D2 are the positions of the X-ray source and detector corresponding to the angle α2. is the magnification of point P1 of this type of dental arch curve, Magnification of point P2 of the dental arch curve.

[0063] Furthermore, after determining the motion trajectory of this type of dental arch curve, in order to ensure that the amount of radiation received by each point on this type of dental arch curve is the same, that is, to ensure that the radiation time received by each point on this type of dental arch curve is the same, the movement speed of the X-ray light source and detector of the oral CT machine can be determined according to the motion trajectory of the X-ray light source and detector of the oral CT machine and the amount of radiation received by each point on this type of dental arch curve, that is, the radiation time.

[0064] In one embodiment of the present invention, the acquisition module 30, the oral CT machine can acquire oral projection data of the patient to be examined according to the determined motion trajectory and motion speed, and only needs to acquire the oral projection data once.

[0065] In one embodiment of the present invention, Figure 4 As shown, the first building module 40 can obtain the dental arch surface of the dental arch curve of this type by moving the dental arch curve of this type up and down, and evenly set sampling points on the dental arch surface.

[0066] In one embodiment of the present invention, the second processing module 50 may determine all acquisition positions of each sampling point according to the motion trajectory, and may calculate the projection position of each sampling point according to the acquisition positions.

[0067] Among them, the sampling point can be specifically P(x, y, z), and all the collection positions of the sampling point are the positions S1(x1, y1, z1), S2(x2, y2, z2), ..., Sn(xn, yn, zn) of all X-ray light sources that can collect the sampling point P(x, y, z) on the motion trajectory of the corresponding dental arch surface, and the corresponding detector positions D1(x1, y1, z1), D2(x2, y2, z2), ..., Dn(xn, yn, zn), wherein the number n of X-ray light sources may change with the position of the sampling point.

[0068] Furthermore, the projection position of each sampling point on the detector can be calculated based on each sampling point and its acquisition position, ie, the positions of all X-ray light sources that can acquire the sample point and the position of the corresponding detector.

[0069] In one embodiment of the present invention, the second construction module 60 can obtain the corresponding detector image value from the oral projection data based on the projection position of each sampling point, i.e., the projection position on the detector, i.e., the image value of the sampling point projected on the detector, such as V1, V2, ..., Vn. Furthermore, based on the distribution of the image values, m image values ​​can be selected from the image values ​​and their average value can be calculated as the pixel value of the panoramic image of the dental arch surface, thereby constructing the panoramic image of the dental arch surface. Here, m varies with the position of the sampling point and is specifically determined by the detector width and the motion trajectory of the X-ray light source.

[0070] Furthermore, if Figure 8 As shown, the oral panoramic imaging system of an embodiment of the present invention further includes a third construction module 70, a third processing module 80, and a fourth construction module 90. The third construction module 70 is configured to move the dental arch surface to obtain a secondary dental arch surface, wherein secondary sampling points are provided on the dental arch surface; the third processing module 80 is configured to determine the projection position of each secondary sampling point based on the motion trajectory; and the fourth construction module 90 is configured to construct a panoramic image of the secondary dental arch surface based on the oral projection data and the projection position of each secondary sampling point.

[0071] In one embodiment of the present invention, the third building module 70 can obtain a secondary dental arch surface by moving the dental arch surface obtained by the first building module 40 forward and backward, and evenly set secondary sampling points on the secondary dental arch surface.

[0072] In one embodiment of the present invention, the working process of the third processing module 80 and the fourth construction module 90 can refer to the working process of the second processing module 50 and the second construction module 60, thereby obtaining a panoramic image of the secondary dental arch surface.

[0073] Furthermore, by repeatedly executing the third processing module 80 and the fourth building module 90, a plurality of panoramic images of dental arch surfaces can be obtained. Thus, corresponding panoramic images can be obtained on different dental arch surfaces through the oral projection data collected by a single scan, for example Figure 6 The oral multi-layer panoramic image shown, and through Figure 6 It can be seen that for dental arch surfaces at different positions, the overlap of soft tissues and bone tissues at different positions will also be different.

[0074] Furthermore, for the oral multi-layer panoramic image obtained in the above embodiment, an image processing module, that is, an image processing tool, can be set to adjust the grayscale value distribution of the image and optimize the contrast of the image to improve the image resolution and reduce the image noise.

[0075] The oral panoramic imaging system proposed in an embodiment of the present invention can obtain a multi-layer panoramic image of the oral cavity through the oral projection data collected in a single scan, and the multi-layer panoramic image of the oral cavity is composed of dental arch surfaces at different positions, thereby effectively reducing the overlap of soft tissue and bone tissue on the multi-layer panoramic image of the oral cavity.

[0076] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0077] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0078] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

Claims

1. A method for panoramic oral imaging, characterized in that: The following steps are involved: Enter the dental arch curve type of the patient to be tested; determining a motion trajectory and a motion speed according to the dental arch curve type; Collecting oral cavity projection data of the patient to be detected according to the motion trajectory and the motion speed; Constructing a dental arch surface according to the dental arch curve type, wherein sampling points are provided on the dental arch surface; Determine the projection position of each sampling point according to the motion trajectory; Constructing a panoramic image of the dental arch surface according to the oral projection data and the projection position of each sampling point, Determining a motion trajectory and a motion speed according to the dental arch curve type specifically includes the following steps: determining imaging requirements for the dental arch curve type, wherein the imaging requirements include imaging resolution and imaging radiation; determining the motion trajectory according to the imaging resolution; determining the motion speed of the X-ray light source and detector of the oral CT machine according to the motion trajectory of the X-ray light source and detector of the oral CT machine and the radiation received by each point on the dental arch curve of this type, that is, the radiation time; According to the projection position of each sampling point, that is, the projection position on the detector, the corresponding detector value is obtained from the oral projection data, that is, the image value of the sampling point projected on the detector. According to the distribution law of the image value, m image values ​​are selected from them, and their average value is calculated as the pixel value of the panoramic image of the dental arch surface, thereby constructing the panoramic image of the dental arch surface.

2. The oral panoramic imaging method according to claim 1, characterized in that: The following steps are also included: Moving the dental arch surface to obtain a secondary dental arch surface, wherein the dental arch surface is provided with secondary sampling points; Determine the projection position of each of the secondary sampling points according to the motion trajectory; A panoramic image of the secondary dental arch surface is constructed according to the oral projection data and the projection position of each secondary sampling point.

3. The oral panoramic imaging method according to claim 2, characterized in that: The dental arch curve types include: A type of dental arch curve, wherein the dental arch width interval of the type of dental arch curve is (0, 50] mm; Class II dental arch curve, the dental arch width interval of the Class II dental arch curve is (50, 60] mm; Three types of dental arch curves, wherein the dental arch width interval of the three types of dental arch curves is (60, 70] mm; Four types of dental arch curves, wherein the dental arch width interval of the four types of dental arch curves is (70, +∞) mm.

4. The oral panoramic imaging method according to claim 3, characterized in that: Constructing a dental arch surface according to the dental arch curve type specifically includes the following steps: The dental arch curve of the type is moved up and down to obtain a corresponding dental arch surface, and the sampling points are evenly set on the dental arch surface.

5. The oral panoramic imaging method according to claim 4, characterized in that: Determining the projection position of each sampling point according to the motion trajectory specifically includes the following steps: Determine all acquisition positions of each of the sampling points according to the motion trajectory; The projection position of each sampling point is calculated according to the acquisition position.

6. An oral panoramic imaging system, characterized in that: include: An input module, the input module is used to input the dental arch curve type of the patient to be tested; a first processing module, configured to determine a motion trajectory and a motion speed according to the dental arch curve type; An acquisition module, configured to acquire oral projection data of the patient to be detected according to the motion trajectory and the motion speed; A first construction module, the first construction module is used to construct a dental arch surface according to the dental arch curve type, wherein sampling points are set on the dental arch surface; a second processing module, configured to determine a projection position of each sampling point according to the motion trajectory; a second construction module, configured to construct a panoramic image of the dental arch surface according to the oral projection data and the projection position of each sampling point; The first processing module is specifically used to determine the imaging requirements of the dental arch curve type, wherein the imaging requirements include imaging resolution and imaging radiation, the motion trajectory is determined according to the imaging resolution, and the movement speed of the X-ray light source and detector of the oral CT machine is determined according to the motion trajectory of the X-ray light source and detector of the oral CT machine and the radiation amount received by each point on the dental arch curve of this type, that is, the radiation time. The second construction module is specifically used to obtain the corresponding detector value from the oral projection data according to the projection position of each sampling point, that is, the projection position on the detector, that is, the image value of the sampling point projected on the detector, and according to the distribution law of the image value, select m image values ​​therefrom, and calculate their average value as the pixel value of the panoramic image of the dental arch surface, thereby constructing the panoramic image of the dental arch surface.

7. The oral panoramic imaging system according to claim 6, characterized in that: Also includes: A third construction module, the third construction module is used to move the dental arch surface to obtain a secondary dental arch surface, wherein the dental arch surface is provided with secondary sampling points; a third processing module, configured to determine a projection position of each of the secondary sampling points according to the motion trajectory; A fourth construction module is used to construct a panoramic image of the secondary dental arch surface according to the oral projection data and the projection position of each secondary sampling point.

8. The oral panoramic imaging system according to claim 7, characterized in that: The dental arch curve types include: A type of dental arch curve, wherein the dental arch width interval of the type of dental arch curve is (0, 50] mm; Class II dental arch curve, the dental arch width interval of the Class II dental arch curve is (50, 60] mm; Three types of dental arch curves, wherein the dental arch width interval of the three types of dental arch curves is (60, 70] mm; Four types of dental arch curves, wherein the dental arch width interval of the four types of dental arch curves is (70, +∞) mm.

Images