Collimator control method, device, apparatus and medium in spiral scanning mode

Abstract

The collimator control method, device, equipment and medium provided by the embodiments of the present disclosure in the spiral scanning mode include: obtaining scanning parameter data corresponding to the target object, wherein the scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed; determining the scanning space range information of the target object according to the scanning parameter data; determining the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, wherein the scanning module includes an X-ray light source, a collimator and a detector, the collimator includes a first collimator blade and a second collimator blade, and the position information of the scanning module includes a focal gate distance, a focal isocenter distance, a focal detector distance, an X-ray light source width and a collimator opening. The absorption of ineffective doses by the scanned person can be saved to the maximum extent, thereby reducing the radiation damage to the scanned person.

Description

Technical Field

[0001] The present invention relates to the technical field of CT scanning and related technical fields, and in particular to a collimator control method, device, equipment and storage medium suitable for use in a spiral scanning mode. Background Art

[0002] CT scanning systems are widely used in industry and medicine. In CT scanning systems, spiral scanning mode is a very common and widely used continuous scanning method, which is widely used in multiple scanning parts and various clinical scenarios, especially in the case of rapid acquisition of high-quality images. Its flexibility and efficiency make it an important part of CT technology.

[0003] However, during conventional spiral scanning, the collimator opening is usually kept constant, which means that the width of the beam remains consistent throughout the scanning process and is not adjusted over time to reduce unnecessary doses. In addition, due to the specific rules of the spiral reconstruction algorithm when indexing data, the data acquired at the start and end positions during the scanning process can only be partially effectively utilized, resulting in the radiation dose corresponding to these unused data being actually wasted. This situation will further increase the radiation dose waste rate when the collimator opening is increased, especially for high-end CT equipment with wide collimation coverage design. The problem of data waste generated during this spiral scanning process is particularly serious. Summary of the invention

[0004] The embodiments described herein provide a method, device, apparatus, and storage medium for controlling a collimator in a spiral scanning mode, which solve the problems existing in the prior art.

[0005] In a first aspect, according to the present disclosure, a collimator control method in a spiral scanning mode is provided, comprising:

[0006] Acquire scanning parameter data corresponding to the target object, wherein the scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed;

[0007] Determine scanning space range information of the target object according to the scanning parameter data;

[0008] The control strategy of the collimator is determined according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, wherein the scanning module includes an X-ray light source, a collimator and a detector, the collimator includes a first collimator blade and a second collimator blade, and the position information of the scanning module includes a focal distance, a focal isocenter distance, a focal point detector distance, an X-ray light source width and a collimator opening.

[0009] In some embodiments of the present disclosure, determining the scanning space range information of the target object according to the scanning parameter data includes:

[0010] Determine a target scanning length according to the scanning length and the depth information of the image to be reconstructed, wherein the target scanning length is composed of the first sub-image depth information to be reconstructed, the scanning length, and the second sub-image depth information to be reconstructed, and the first sub-image depth information to be reconstructed and the second sub-image depth information to be reconstructed are half of the depth information of the image to be reconstructed;

[0011] The scanning space range information of the target object is determined according to the target scanning length and the reconstruction field of view.

[0012] In some embodiments of the present disclosure, the control strategy of the collimator is determined according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, including:

[0013] Determining a start edge and an end edge according to the scanning space range information and the scanning bed movement direction;

[0014] Determine a first preset threshold, a second preset threshold, a first preset speed, and a second preset speed according to the scanning space range information, the position information of the scanning module, and the moving direction of the scanning bed;

[0015] Determine a first opening and closing state, a first moving speed, and a first moving direction of the first collimator blade according to a relationship between the distance between the starting edge and the light plane and a first preset threshold and a second preset threshold;

[0016] The second opening and closing state, the second moving speed and the second moving direction of the second collimating blade are determined according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold.

[0017] In some embodiments of the present disclosure, determining the first opening and closing state, the first moving speed, and the first moving direction of the first collimator blade according to the relationship between the distance between the starting edge and the light plane and the first preset threshold and the second preset threshold includes:

[0018] When the distance between the starting edge and the light plane is greater than a first preset threshold, controlling the first collimating blade to be in a fully closed state;

[0019] When the distance between the starting edge and the light plane is greater than a second preset threshold and less than a first preset threshold, controlling the first collimating blade to move along the moving direction of the scanning bed at a first preset speed;

[0020] When the distance between the starting edge and the light plane is less than a second preset threshold, controlling the first collimator blade to move along the moving direction of the scanning bed at a second preset speed until the first collimator blade moves to a first preset position;

[0021] Wherein, the first preset position is the position corresponding to when the first collimating blade is in a fully open state.

[0022] In some embodiments of the present disclosure, determining the second opening and closing state, the second moving speed, and the second moving direction of the second collimator blade according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold includes:

[0023] When the distance between the end edge and the light plane is less than a second preset threshold, controlling the second collimating blade to move along the moving direction of the scanning bed at a second preset speed;

[0024] When the distance between the end edge and the light plane is greater than a second preset threshold and less than a first preset threshold, controlling the second collimating blade to move at a first speed along a moving direction of the scanning bed;

[0025] When the distance between the end edge and the light plane is greater than a first preset threshold, the second collimating blade is controlled to be in a fully closed state.

[0026] In some embodiments of the present disclosure, the first preset threshold satisfies:

[0027] ,

[0028] The second preset threshold satisfies:

[0029] ,

[0030] The first preset speed satisfies:

[0031] ,

[0032] The second preset speed satisfies:

[0033] ,

[0034] in, is the focal distance, is the focal isocenter distance, is the focal detector distance, is the width of the X-ray source, is the collimator opening, To reconstruct the field of view, V is the moving speed of the scanning bed.

[0035] In some embodiments of the present disclosure, it also includes:

[0036] Obtain the scanning data received by the detector;

[0037] A scanned image is determined according to the scanned data.

[0038] In a second aspect, according to the present disclosure, a collimator control device in a spiral scanning mode is provided, comprising:

[0039] A scanning parameter data acquisition module, used to acquire scanning parameter data corresponding to the target object, wherein the scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed;

[0040] A scanning space range information determination module, used to determine the scanning space range information of the target object according to the scanning parameter data;

[0041] A control strategy determination module is used to determine the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, wherein the scanning module includes an X-ray light source, a collimator and a detector, the collimator includes a first collimator blade and a second collimator blade, and the position information of the scanning module includes a focal gate distance, a focal isocenter distance, a focal point detector distance, an X-ray light source width and a collimator opening.

[0042] In a third aspect, according to the present disclosure, there is provided a computer device, including:

[0043] one or more processors;

[0044] a storage device for storing one or more programs,

[0045] When the one or more programs are executed by the one or more processors, the one or more processors implement any method as described in the first aspect.

[0046] In a fourth aspect, according to the content of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, it implements any method as described in the first aspect.

[0047] The collimator control device, apparatus, equipment and medium provided in the spiral scanning mode by the embodiments of the present disclosure first obtain scanning parameter data corresponding to the target object; then determine the scanning space range information of the target object according to the scanning parameter data; finally determine the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, so as to determine the scanning space range information of the scanned target object based on the scanning parameter data, guide the opening of the collimator during the scanning process based on the scanned space range information and the position information of the scanning module, thereby realizing the control of the dynamic radiation field, achieving the maximum saving of the scanned person's absorption of invalid doses, and thereby reducing the radiation damage to the scanned person.

[0048] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein:

[0050] Figure 1 is a flow chart of a collimator control method in a spiral scanning mode provided by an embodiment of the present disclosure;

[0051] Figure 2A and Figure 2B is a structural schematic diagram of a scanning space range of a target object provided by an embodiment of the present disclosure;

[0052] Figure 3A-Figure 3F is a schematic diagram of the structure of a target object relative scanning module provided in an embodiment of the present disclosure;

[0053] Figure 3G is a schematic diagram of a control strategy of a collimator provided in an embodiment of the present disclosure;

[0054] Figure 4 is a structural schematic diagram of a collimator control device in a spiral scanning mode provided by an embodiment of the present disclosure;

[0055] Figure 5 It is a structural diagram of a computer device provided in an embodiment of the present disclosure.

[0056] In the drawings, reference numerals with the same last two digits correspond to the same elements. It should be noted that the elements in the drawings are schematic and not drawn to scale. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0058] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person skilled in the art to which the subject matter of the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the specification and the relevant art, and will not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together directly or through one or more intermediate components.

[0059] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0060] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0061] Furthermore, in all embodiments of the present disclosure, terms such as “first” and “second” are used only to distinguish one component (or a part of a component) from another component (or another part of a component).

[0062] In the description of the present application, unless otherwise specified, “plurality” means more than two (including two), and similarly, “plurality groups” means more than two (including two).

[0063] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0064] Based on the problems existing in the prior art, the present disclosure provides a collimator control method in a spiral scanning mode. Figure 1 is a flow chart of a collimator control method in a spiral scanning mode provided by an embodiment of the present disclosure, such as Figure 1 As shown, the specific process of the collimator control method in the spiral scanning mode includes:

[0065] S110: Acquire scanning parameter data corresponding to the target object.

[0066] The scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed.

[0067] Before the CT scanning device scans the target object, it will set the scanning parameter data according to the diagnosis certificate presented by the physician, and then obtain the scanning parameter data corresponding to the target object.

[0068] S120. Determine scanning space range information of the target object according to the scanning parameter data.

[0069] Specifically, the scanning spatial range information of the target object is determined according to the scanning parameter data, including: determining the target scanning length according to the scanning length and the depth information of the image to be reconstructed, wherein the target scanning length is composed of the first sub-depth information of the image to be reconstructed, the scanning length and the second sub-depth information of the image to be reconstructed, and the first sub-depth information of the image to be reconstructed and the second sub-depth information of the image to be reconstructed are half of the depth information of the image to be reconstructed; determining the scanning spatial range information of the target object according to the target scanning length and the reconstruction field of view.

[0070] After obtaining the scanning parameter data, the target scanning length is first determined according to the scanning length and the depth information of the image to be reconstructed, and then the scanning space range information of the target object is determined according to the target scanning length and the reconstruction field of view. Specifically, the scanning space range information is a cylinder with the reconstruction field of view as the bottom and the target scanning length as the height, such as Figure 2A As shown, Figure 2B Schematic diagram of the top view of the scanning space range of the target object.

[0071] S130, determining a control strategy for the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed.

[0072] Among them, the scanning module includes an X-ray light source, a collimator and a detector, the collimator includes a first collimator blade and a second collimator blade, and the position information of the scanning module includes focal distance, focus isocenter distance, focus detector distance, X-ray light source width and collimator opening.

[0073] It should be noted that the focal distance is the vertical distance between the X-ray source and the collimator, the focus isocenter distance is the vertical distance between the X-ray source and the rotation axis, the focus detector distance is the vertical distance between the X-ray source and the detector, the X-ray source width is the width of the X-ray source along the moving direction of the scanning bed, and the collimator opening is the opening size of the collimator.

[0074] Specifically, after the scanning space range information of the target object is determined, the starting edge and the ending edge in the scanning space range information of the target object may be determined according to the moving direction of the scanning bed.

[0075] Specifically, in order to ensure that the X-ray radiation dose is not wasted in the spiral scan, a control strategy for the collimator in different scanning stages is constructed according to the position information of the scanning module, the moving direction of the scanning bed and the scanning space range information of the target object when the target object moves along the scanning bed, so as to achieve different scanning strategies for the scanning module in different scanning stages and reduce the waste of radiation dose.

[0076] In a specific implementation, a control strategy of the collimator is determined according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, including: determining the starting edge and the ending edge according to the scanning space range information and the moving direction of the scanning bed; determining the first preset threshold, the second preset threshold, the first preset speed and the second preset speed according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed; determining the first opening and closing state, the first moving speed and the first moving direction of the first collimator blade according to the relationship between the distance between the starting edge and the light plane and the first preset threshold and the second preset threshold; determining the second opening and closing state, the second moving speed and the second moving direction of the second collimator blade according to the relationship between the distance between the ending edge and the light plane and the first preset threshold and the second preset threshold.

[0077] According to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, a first preset threshold, a second preset threshold, a first preset speed and a second preset speed are determined.

[0078] The first preset threshold satisfies:

[0079] ,

[0080] The second preset threshold satisfies:

[0081] ,

[0082] The first preset speed satisfies:

[0083] ,

[0084] The second preset speed satisfies:

[0085] ,

[0086] in, is the focal distance, is the focal isocenter distance, is the focal detector distance, is the width of the X-ray source, is the collimator opening, To reconstruct the field of view, V is the moving speed of the scanning bed.

[0087] According to the relationship between the distance between the starting edge and the light plane and the first preset threshold and the second preset threshold, the first opening and closing state, the first moving speed and the first moving direction of the first collimator blade are determined, including: when the distance between the starting edge and the light plane is greater than the first preset threshold, the first collimator blade is controlled to be in a fully closed state; when the distance between the starting edge and the light plane is greater than the second preset threshold and less than the first preset threshold, the first collimator blade is controlled to move along the moving direction of the scanning bed at a first preset speed; when the distance between the starting edge and the light plane is less than the second preset threshold, the first collimator blade is controlled to move along the moving direction of the scanning bed at a second preset speed until the first collimator blade moves to a first preset position; wherein the first preset position is a position corresponding to when the first collimator blade is in a fully open state.

[0088] If the scanning bed moves in the direction of Z, the starting edge is A1 and the ending edge is A2. When the distance L1 between the starting edge A1 and the light plane is greater than the first preset threshold, that is, the target object has not entered the scanning range of the X-ray light source, the first collimator blade is controlled to be in a fully closed state, such as Figure 3A As shown, the detector does not receive the X-ray light source.

[0089] When the distance between the starting edge and the light plane is greater than the second preset threshold and less than the first preset threshold, the first collimator blade is controlled to move along the moving direction of the scanning bed at the first preset speed, that is, the starting edge of the scanning space range information (planned imaging area) of the target object has entered the ray field on the right side of the X-ray light source. Specifically, the far source point Y1 of the starting edge has entered the ray field on the right side of the X-ray light source. At this time, the first collimator blade is controlled to move along the moving direction of the scanning bed at the first preset speed to ensure that the area entering the ray field of the X-ray light source in the scanning space range information of the target object is covered by the ray field, such as Figure 3B shown.

[0090] When the distance between the starting edge and the light plane is less than the second preset threshold, the first collimator blade is controlled to move along the scanning bed moving direction at a second preset speed, so that when the distance between the starting edge and the light plane is less than the second preset threshold, the first collimator blade moves along the scanning bed moving direction at the second preset speed until the first collimator blade moves to the first preset position, such as Figure 3C As shown, that is, the starting edge of the scanning space range information (planned imaging area) of the target object has entered the ray field of the X-ray light source. Specifically, the far source point Y1 and the near source point X1 of the starting edge have entered the ray field of the X-ray light source. At this time, the first collimator blade is controlled to move along the moving direction of the scanning bed at a second preset speed to ensure that the area entering the ray field of the X-ray light source in the scanning space range information of the target object is covered by the ray field.

[0091] The second opening and closing state, the second moving speed and the second moving direction of the second collimator blade are determined according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold, including: when the distance between the end edge and the light plane is less than the second preset threshold, the second collimator blade is controlled to move along the moving direction of the scanning bed at the second preset speed; when the distance between the end edge and the light plane is greater than the second preset threshold and less than the first preset threshold, the second collimator blade is controlled to move along the moving direction of the scanning bed at the first speed; when the distance between the end edge and the light plane is greater than the first preset threshold, the second collimator blade is controlled to be in a fully closed state.

[0092] When the distance L2 between the end edge A2 and the light plane is less than the second preset threshold, the second collimator blade is controlled to move along the moving direction of the scanning bed at a second preset speed, so that when the distance between the end edge A2 and the light plane is less than the second preset threshold, the second collimator blade moves along the moving direction of the scanning bed at the second preset speed, such as Figure 3D As shown, that is, the end edge of the scanning space range information (planned imaging area) of the target object is in the ray field on the left side of the X-ray light source. Specifically, the far source point Y2 and the near source point X2 of the end edge are both in the ray field on the left side of the X-ray light source. At this time, the second collimator blade is controlled to move along the moving direction of the scanning bed at a second preset speed to ensure that the area of ​​the scanning space range information of the target object that has not yet left the ray field of the X-ray light source is covered by the ray field.

[0093] When the distance between the end edge and the light plane is greater than the second preset threshold and less than the first preset threshold, the second collimator blade is controlled to move along the moving direction of the scanning bed at the first preset speed, that is, the end edge of the scanning space range information (planned imaging area) of the target object will partially move out of the ray field of the X-ray light source slowly. Specifically, the near-source point X2 of the end edge first moves out of the ray field of the X-ray light source. At this time, the second collimator blade is controlled to move along the moving direction of the scanning bed at the first preset speed to ensure that the area in the scanning space range information of the target object that has not moved out of the ray field of the X-ray light source is covered by the ray field, such as Figure 3E shown.

[0094] When the distance between the end edge and the light plane is greater than the first preset threshold, that is, the target object has moved out of the ray field of the X-ray light source, at this time, the second collimator blade is controlled to be in a fully closed state, such as Figure 3F As shown, the detector does not receive the X-ray light source.

[0095] That is, according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, the specific process of determining the control strategy of the collimator is as follows: Figure 3G shown.

[0096] After the scanning data received by the detector is acquired under different control strategies, the scanning image can be determined through back-projection reconstruction.

[0097] It should be noted that, in the above embodiment, the first preset threshold is determined based on the relationship between the far source point Y1 of the starting edge and the ray field of the X-ray light source (or the relationship between the far source point Y2 of the ending edge and the ray field of the X-ray light source), combined with Figure 3B (or Figure 3E ), when the far source point Y1 at the starting edge overlaps with the ray field of the X-ray light source for the first time, at this time, according to the triangle similarity principle, it can be determined that the distance from the point where the far source point Y1 at the starting edge overlaps with the ray field of the X-ray light source for the first time to the light plane satisfies: The second preset threshold is determined based on the relationship between the near-source point X1 of the starting edge and the ray field of the X-ray light source (or the relationship between the near-source point X2 of the ending edge and the ray field of the X-ray light source), combined with Figure 3C (or Figure 3D ), the distance between the near source point X1 at the starting edge and the light plane satisfies: , the ray field of the X-ray source will cover all points on the starting edge.

[0098] Similarly, the first collimator blade moves along the direction of movement of the scanning bed. During the movement of the first collimator blade, the light plane of the X-ray source is blocked by an area such as Figure 3B and Figure 3CIn the shaded area shown in FIG. 1 , when the distance between the starting edge and the light plane is greater than the second preset threshold and less than the first preset threshold, in order to ensure that the far source point Y1 of the starting edge is located within the ray field of the X-ray light source, according to the triangle similarity theorem, it can be determined that the first preset speed satisfies: , when the distance between the starting edge and the light plane is less than the second preset threshold, in order to ensure that the near-source point X1 of the starting edge is located within the ray field of the X-ray light source, according to the triangle similarity theorem, it can be determined that the second preset speed satisfies: .

[0099] It should be noted that, in the above embodiment, the distance L1 between the starting edge and the light plane is the distance between the starting edge of the target object's scanning space range information before it reaches the light plane during the movement of the scanning bed, and the distance L2 between the ending edge and the light plane is the distance between the ending edge of the target object's scanning space range information after it reaches the light plane during the movement of the scanning bed.

[0100] The collimator control method in the spiral scanning mode provided by the embodiment of the present disclosure first acquires scanning parameter data corresponding to the target object; then determines the scanning space range information of the target object according to the scanning parameter data; finally determines the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, so as to determine the scanning space range information of the scanned target object based on the scanning parameter data, guide the opening of the collimator during the scanning process based on the scanned space range information and the position information of the scanning module, and further realize the control of the dynamic radiation field, so as to maximize the saving of the scanned person's absorption of invalid doses, and further reduce the radiation damage of the scanned person.

[0101] Based on the above embodiments, Figure 4 FIG. 1 is a schematic diagram of a structure of a collimator control device in a spiral scanning mode provided by an embodiment of the present disclosure. Figure 4 As shown, in the spiral scanning mode, the collimator control device includes:

[0102] A scanning parameter data acquisition module 410 is used to acquire scanning parameter data corresponding to the target object, wherein the scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed;

[0103] A scanning space range information determination module 420, configured to determine the scanning space range information of the target object according to the scanning parameter data;

[0104] The control strategy determination module 430 is used to determine the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, wherein the scanning module includes an X-ray light source, a collimator and a detector, the collimator includes a first collimator blade and a second collimator blade, and the position information of the scanning module includes a focal gate distance, a focal center distance, a focal point detector distance, an X-ray light source width and a collimator opening.

[0105] The collimator control device in the spiral scanning mode provided by the embodiment of the present disclosure first obtains scanning parameter data corresponding to the target object; then determines the scanning space range information of the target object according to the scanning parameter data; finally, determines the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, so as to determine the scanning space range information of the scanned target object based on the scanning parameter data, guide the opening of the collimator during the scanning process based on the scanned space range information and the position information of the scanning module, and further realize the control of the dynamic radiation field, so as to maximize the saving of the scanned person's absorption of invalid doses, and further reduce the radiation damage of the scanned person.

[0106] In a specific implementation, determining the scanning space range information of the target object according to the scanning parameter data includes:

[0107] Determine a target scanning length according to the scanning length and the depth information of the image to be reconstructed, wherein the target scanning length is composed of the first sub-image depth information to be reconstructed, the scanning length, and the second sub-image depth information to be reconstructed, and the first sub-image depth information to be reconstructed and the second sub-image depth information to be reconstructed are half of the depth information of the image to be reconstructed;

[0108] The scanning space range information of the target object is determined according to the target scanning length and the reconstruction field of view.

[0109] In a specific implementation, the control strategy of the collimator is determined according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, including:

[0110] Determining a start edge and an end edge according to the scanning space range information and the scanning bed movement direction;

[0111] Determine a first preset threshold, a second preset threshold, a first preset speed, and a second preset speed according to the scanning space range information, the position information of the scanning module, and the moving direction of the scanning bed;

[0112] Determine a first opening and closing state, a first moving speed, and a first moving direction of the first collimator blade according to a relationship between the distance between the starting edge and the light plane and a first preset threshold and a second preset threshold;

[0113] The second opening and closing state, the second moving speed and the second moving direction of the second collimating blade are determined according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold.

[0114] In a specific embodiment, determining the first opening and closing state, the first moving speed and the first moving direction of the first collimating blade according to the relationship between the distance between the starting edge and the light plane and the first preset threshold and the second preset threshold includes:

[0115] When the distance between the starting edge and the light plane is greater than a first preset threshold, controlling the first collimating blade to be in a fully closed state;

[0116] When the distance between the starting edge and the light plane is greater than a second preset threshold and less than a first preset threshold, controlling the first collimating blade to move along the moving direction of the scanning bed at a first preset speed;

[0117] When the distance between the starting edge and the light plane is less than a second preset threshold, controlling the first collimator blade to move along the moving direction of the scanning bed at a second preset speed until the first collimator blade moves to a first preset position;

[0118] Wherein, the first preset position is the position corresponding to when the first collimating blade is in a fully open state.

[0119] In a specific embodiment, the second opening and closing state, the second moving speed and the second moving direction of the second collimating blade are determined according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold, including:

[0120] When the distance between the end edge and the light plane is less than a second preset threshold, controlling the second collimating blade to move along the moving direction of the scanning bed at a second preset speed;

[0121] When the distance between the end edge and the light plane is greater than a second preset threshold and less than a first preset threshold, controlling the second collimating blade to move at a first speed along a moving direction of the scanning bed;

[0122] When the distance between the end edge and the light plane is greater than a first preset threshold, the second collimating blade is controlled to be in a fully closed state.

[0123] In a specific implementation, the first preset threshold satisfies:

[0124] ,

[0125] The second preset threshold satisfies:

[0126] ,

[0127] The first preset speed satisfies:

[0128] ,

[0129] The second preset speed satisfies:

[0130] ,

[0131] in, is the focal distance, is the focal isocenter distance, is the focal detector distance, is the width of the X-ray source, is the collimator opening, To reconstruct the field of view, V is the moving speed of the scanning bed.

[0132] In a specific embodiment, it also includes:

[0133] Obtain the scanning data received by the detector;

[0134] A scanned image is determined according to the scanned data.

[0135] The present application also provides a computer device. Figure 5 , Figure 5 This is a basic structural block diagram of the computer device in this embodiment.

[0136] The computer device includes a memory 510 and a processor 520 that are connected to each other through a system bus. It should be noted that the figure only shows a computer device with components 510-520, but it should be understood that it is not required to implement all the components shown, and more or fewer components can be implemented instead. Among them, those skilled in the art can understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA), digital processors (Digital Signal Processor, DSP), embedded devices, etc.

[0137] Computer devices can be computing devices such as desktop computers, notebooks, PDAs, and cloud servers. Computer devices can interact with users through keyboards, mice, remote controls, touch pads, or voice control devices.

[0138] The memory 510 includes at least one type of readable storage medium, and the readable storage medium includes a non-volatile memory or a volatile memory, such as a flash memory, a hard disk, a multimedia card, a card-type memory (such as an SD or DX memory, etc.), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, etc., and the RAM may include a static RAM or a dynamic RAM. In some embodiments, the memory 510 may be an internal storage unit of a computer device, such as a hard disk or a memory of the computer device. In other embodiments, the memory 510 may also be an external storage device of a computer device, such as a plug-in hard disk, a smart memory card (SMC), a secure digital (SD) card, or a flash card (Flash Card), etc., equipped on the computer device. Of course, the memory 510 may also include both an internal storage unit of the computer device and an external storage device thereof. In this embodiment, the memory 510 is generally used to store an operating system and various application software installed on the computer device, such as the program code of the above method, etc. In addition, the memory 510 may also be used to temporarily store various data that have been output or are to be output.

[0139] The processor 520 is generally used to perform the overall operation of the computer device. In this embodiment, the memory 510 is used to store program codes or instructions, the program code includes computer operation instructions, and the processor 520 is used to execute the program codes or instructions stored in the memory 510 or process data, such as running the program code of the above method.

[0140] In this article, the bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus system can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0141] Another embodiment of the present application also provides a computer-readable medium, which may be a computer-readable signal medium or a computer-readable medium. A processor in a computer reads a computer-readable program code stored in the computer-readable medium, so that the processor can execute the functional actions specified in each step or a combination of steps in the above method; and generate a device for implementing the functional actions specified in each block or a combination of blocks in the block diagram.

[0142] Computer-readable media include but are not limited to electronic, magnetic, optical, electromagnetic, infrared memory or semiconductor systems, devices or apparatuses, or any appropriate combination of the foregoing, the memory is used to store program codes or instructions, the program codes include computer operating instructions, and the processor is used to execute the program codes or instructions of the above methods stored in the memory.

[0143] For the definitions of memory and processor, please refer to the description of the aforementioned computer device embodiment and will not be repeated here.

[0144] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0145] Each functional unit or module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0146] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., and other media that can store program codes.

[0147] Unless the context clearly indicates otherwise, the singular form of the words used herein and in the appended claims includes the plural and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the words "comprise" and "include" are to be interpreted as inclusive rather than exclusive. Likewise, the terms "include" and "or" should be interpreted as inclusive unless such interpretation is expressly prohibited herein. Where the term "example" is used herein, particularly when it is located after a group of terms, the "example" is merely exemplary and illustrative and should not be considered exclusive or comprehensive.

[0148] Further aspects and scopes of adaptability become apparent from the description provided herein. It should be understood that various aspects of the present application can be implemented individually or in combination with one or more other aspects. It should also be understood that the description and specific embodiments herein are intended for purposes of illustration only and are not intended to limit the scope of the present application.

[0149] Several embodiments of the present disclosure are described in detail above, but it is obvious that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. The protection scope of the present disclosure is defined by the attached claims.

Claims

1. A collimator control method in a spiral scanning mode, characterized in that: include: Acquire scanning parameter data corresponding to the target object, wherein the scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed; Determine scanning space range information of the target object according to the scanning parameter data; Determine a control strategy of a collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, wherein the scanning module includes an X-ray light source, a collimator and a detector, the collimator includes a first collimator blade and a second collimator blade, and the position information of the scanning module includes a focal gate distance, a focal isocenter distance, a focal point detector distance, an X-ray light source width and a collimator opening; Determining the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed includes: Determining a start edge and an end edge according to the scanning space range information and the scanning bed movement direction; Determine a first preset threshold, a second preset threshold, a first preset speed, and a second preset speed according to the scanning space range information, the position information of the scanning module, and the moving direction of the scanning bed; Determine a first opening and closing state, a first moving speed, and a first moving direction of the first collimator blade according to a relationship between the distance between the starting edge and the light plane and a first preset threshold and a second preset threshold; Determine the second opening and closing state, the second moving speed and the second moving direction of the second collimator blade according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold; Wherein, the first preset threshold satisfies: The second preset threshold satisfies: The first preset speed satisfies: The second preset speed satisfies: in, is the focal distance, is the focal isocenter distance, is the focus detector distance, for Width of ray source, is the collimator opening, To rebuild the vision, The scanning bed moving speed.

2. The method according to claim 1, characterized in that: The determining the scanning space range information of the target object according to the scanning parameter data includes: Determine a target scanning length according to the scanning length and the depth information of the image to be reconstructed, wherein the target scanning length is composed of the first sub-image depth information to be reconstructed, the scanning length, and the second sub-image depth information to be reconstructed, and the first sub-image depth information to be reconstructed and the second sub-image depth information to be reconstructed are half of the depth information of the image to be reconstructed; The scanning space range information of the target object is determined according to the target scanning length and the reconstruction field of view.

3. The method according to claim 1, characterized in that The determining of the first opening and closing state, the first moving speed and the first moving direction of the first collimating blade according to the relationship between the distance between the starting edge and the light plane and the first preset threshold and the second preset threshold comprises: When the distance between the starting edge and the light plane is greater than a first preset threshold, controlling the first collimating blade to be in a fully closed state; When the distance between the starting edge and the light plane is greater than a second preset threshold and less than a first preset threshold, controlling the first collimating blade to move along the moving direction of the scanning bed at a first preset speed; When the distance between the starting edge and the light plane is less than a second preset threshold, controlling the first collimator blade to move along the moving direction of the scanning bed at a second preset speed until the first collimator blade moves to a first preset position; Wherein, the first preset position is the position corresponding to when the first collimating blade is in a fully open state.

4. The method according to claim 1, characterized in that: The determining, according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold, the second opening and closing state, the second moving speed and the second moving direction of the second collimating blade comprises: When the distance between the end edge and the light plane is less than a second preset threshold, controlling the second collimating blade to move along the moving direction of the scanning bed at a second preset speed; When the distance between the end edge and the light plane is greater than a second preset threshold and less than a first preset threshold, controlling the second collimating blade to move at a first speed along a moving direction of the scanning bed; When the distance between the end edge and the light plane is greater than a first preset threshold, the second collimating blade is controlled to be in a fully closed state.

5. The method according to claim 1, characterized in that Also includes: Obtain the scanning data received by the detector; A scanned image is determined according to the scanned data.

6. A collimator control device in spiral scanning mode, characterized in that: include: A scanning parameter data acquisition module, used to acquire scanning parameter data corresponding to the target object, wherein the scanning parameter data includes scanning length, reconstruction field of view and depth information of the image to be reconstructed; A scanning space range information determination module, used to determine the scanning space range information of the target object according to the scanning parameter data; a control strategy determination module, configured to determine a control strategy of a collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed, wherein the scanning module comprises an X-ray light source, a collimator and a detector, the collimator comprises a first collimator blade and a second collimator blade, and the position information of the scanning module comprises a focal gate distance, a focal isocenter distance, a focal point detector distance, an X-ray light source width and a collimator opening; Determining the control strategy of the collimator according to the scanning space range information, the position information of the scanning module and the moving direction of the scanning bed includes: Determining a start edge and an end edge according to the scanning space range information and the scanning bed movement direction; Determine a first preset threshold, a second preset threshold, a first preset speed, and a second preset speed according to the scanning space range information, the position information of the scanning module, and the moving direction of the scanning bed; Determine a first opening and closing state, a first moving speed, and a first moving direction of the first collimator blade according to a relationship between the distance between the starting edge and the light plane and a first preset threshold and a second preset threshold; Determine the second opening and closing state, the second moving speed and the second moving direction of the second collimator blade according to the relationship between the distance between the end edge and the light plane and the first preset threshold and the second preset threshold; Wherein, the first preset threshold satisfies: The second preset threshold satisfies: The first preset speed satisfies: The second preset speed satisfies: in, is the focal distance, is the focal isocenter distance, is the focus detector distance, for Width of ray source, is the collimator opening, To rebuild the vision, The scanning bed moving speed.

7. A computer device, characterized in that: include: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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