Method, device, equipment and medium for determining tube current dose in CT scanning system

Abstract

The tube current dose determination method, device, equipment and medium provided in the embodiment of the present disclosure include: constructing a body shape distribution position function of a scanning phantom; determining a scanning bed trajectory time function of the CT scanning system according to the rotation period of the scanning gantry, the starting scanning position of the scanning bed, the pitch time function of the scanning gantry and the collimation parameters of the scanning gantry in the CT scanning system; determining a scanning gantry trajectory time function of the CT scanning system according to the starting scanning angle and the rotation period of the scanning gantry in the CT scanning system; determining a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function; determining a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function. The modulation of the tube current dose of patients with different body shape distributions is achieved in a variable pitch spiral scanning mode, thereby ensuring the quality of the scanned image.

Description

Technical Field

[0001] The present invention relates to the field of CT scanning technology and related technical fields, and in particular to a method, device, equipment and storage medium for determining tube current dose in a CT scanning system. Background Art

[0002] Spiral scanning is an important scanning mode in CT applications, in which pitch is an important parameter of spiral scanning. The size of the pitch determines the speed of scanning. Large and small pitches correspond to clinical applications in different scenarios. Small pitches are used for tissues with high diagnostic requirements, and large pitches are used for tissues that require fast and wide-range scanning. With the gradual increase in clinical application requirements, spiral scanning provides a variable pitch scanning mode. In the variable pitch scanning scenario, you can freely switch between large and small pitches according to the plan.

[0003] In the variable pitch spiral scanning mode, in order to ensure that the image quality consistency along the pitch change direction meets the requirements, different doses (tube current or milliamperes) need to be used for different pitch positions. The dose modulation (also called tube current modulation or milliampere modulation) function that is more commonly used in the traditional spiral scanning mode also requires differentiated control of the dose. This causes a fundamental conflict between the two (variable pitch and dose modulation) in the control of the dose, resulting in poor image consistency under variable pitch spiral scanning. Summary of the invention

[0004] The embodiments described herein provide a method, apparatus, device and storage medium for determining tube current dose in a CT scanning system, which solve the problems existing in the prior art.

[0005] In a first aspect, according to the present disclosure, a method for determining tube current dose in a CT scanning system is provided, comprising:

[0006] Constructing the body shape distribution position function of the scanning phantom;

[0007] Determine a scanning bed trajectory time function of the CT scanning system according to a rotation period of a scanning gantry, a starting scanning position of a scanning bed, a pitch time function of the scanning gantry and a collimation parameter in the CT scanning system;

[0008] Determine a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system;

[0009] Determining a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function;

[0010] A target tube current modulation dose at a target scanning time is determined according to the body shape distribution time function and the pitch time function.

[0011] In some embodiments of the present disclosure, the scanning bed trajectory time function of the CT scanning system satisfies:

[0012]

[0013] Wherein, RT is the rotation period of the scanning gantry, z0 is the starting scanning position of the scanning bed, Pitch(t) is the pitch time function, and N*T is the collimation parameter;

[0014] The scanning gantry trajectory time function of the CT scanning system satisfies:

[0015]

[0016] Where RT is the rotation period and θ0 is the starting scanning angle of the scanning gantry.

[0017] In some embodiments of the present disclosure, determining a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function includes:

[0018] Acquiring preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset current-time product under the preset scanning phantom equivalent diameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor;

[0019] Constructing a target tube current modulation dose time function according to the preset scanning phantom equivalent diameter, the preset current time product under the preset scanning phantom equivalent diameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution time function and the pitch time function;

[0020] A target tube current modulation dose at a target scanning time is determined according to the target tube current modulation dose-time function.

[0021] In some embodiments of the present disclosure, determining the target tube current modulation dose at the target scanning time according to the target tube current modulation dose time function includes:

[0022] determining a body size distribution parameter at the target scanning time according to the body size distribution time function;

[0023] Determining a target pitch at the target scanning time according to the pitch-time function;

[0024] A target tube current modulation dose at a target scanning time is determined according to the body shape distribution parameter and the target helical pitch.

[0025] In some embodiments of the present disclosure, before constructing the body shape distribution position function of the scanning phantom, the method further includes:

[0026] In response to receiving a scanning operation submitted by the target object, acquiring a positioning scanning image of the scanning phantom;

[0027] Determining scanning information according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position;

[0028] An average equivalent diameter of the scanning phantom is determined according to the positioning scanning image and the scanning information.

[0029] In some embodiments of the present disclosure, determining the average equivalent diameter of the scanning phantom according to the positioning scanning image and the scanning information includes:

[0030] Determine, according to the positioning scan image, equivalent long-axis information and equivalent short-axis information of the scanning phantom at different scanning positions in the scanning direction of the scanning bed;

[0031] According to the equivalent long axis information and the equivalent short axis information at different scanning positions in the scanning direction of the scanning bed, as well as the start scanning position and the end scanning position, an average equivalent diameter of the scanning phantom in the scanning direction of the scanning bed is determined.

[0032] In some embodiments of the present disclosure, when acquiring the positioning scanning image of the scanning phantom, the method further includes:

[0033] Obtaining a scan type included in the scan operation;

[0034] Acquire a pitch position function corresponding to the scanning type and a pitch position-time function conversion parameter corresponding to the scanning type;

[0035] The pitch-time function is determined according to the pitch-position function and a pitch-position-time function conversion parameter corresponding to the scanning type.

[0036] In a second aspect, according to the present disclosure, a device for determining tube current dose in a CT scanning system is provided, comprising:

[0037] A body shape distribution position function construction module is used to construct a body shape distribution position function of a scanning phantom;

[0038] A scanning bed trajectory time function determination module is used to determine the scanning bed trajectory time function of the CT scanning system according to the rotation period of the scanning gantry, the starting scanning position of the scanning bed, the pitch time function of the scanning gantry and the collimation parameters in the CT scanning system;

[0039] A scanning gantry trajectory time function determination module, used to determine a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system;

[0040] a body shape distribution time function determination module, configured to determine a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function;

[0041] The target tube current modulation dose determination module is used to determine the target tube current modulation dose at the target scanning time according to the body shape distribution time function and the pitch time function.

[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 tube current dose determination method, device, equipment and medium in a CT scanning system provided by the embodiments of the present disclosure first construct a body shape distribution position function of a scanning phantom; determine a scanning bed trajectory time function of the CT scanning system according to a rotation period of a scanning gantry, a starting scanning position of a scanning bed, a pitch time function of the scanning gantry and collimation parameters in the CT scanning system; determine a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system; then determine a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function; finally determine a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function of the scanning phantom. By constructing a scanning bed trajectory time function and a scanning gantry trajectory function, the target scanning position of the scanning bed and the target scanning angle of the scanning gantry at the target scanning time are determined. Then, by substituting the target scanning position and the target scanning angle into the body shape distribution position function of the scanning phantom, the body shape distribution time function at the target scanning time is determined. Finally, by substituting the target scanning time into the body shape distribution time function and the pitch time function, the target tube current modulation dose at the target scanning time is determined. The tube current modulation dose is determined based on the body shape distribution and the scanning pitch of the scanning phantom, thereby ensuring the modulation of the tube current dose of patients with different body shape distributions under the variable pitch spiral scanning mode, thereby ensuring the quality of the scanned image.

[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 method for determining tube current dose in a CT scanning system provided by an embodiment of the present disclosure;

[0051] Figure 2 is a schematic diagram of another method for determining tube current dose in a CT scanning system provided by an embodiment of the present disclosure;

[0052] Figure 3 is a structural schematic diagram of a tube current dose determination device in a CT scanning system provided by an embodiment of the present disclosure;

[0053] Figure 4 It is a structural diagram of a computer device provided in an embodiment of the present disclosure.

[0054] 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

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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).

[0060] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0061] 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.

[0062] Based on the problems existing in the prior art, the present disclosure provides a method for determining tube current dose in a CT scanning system. Figure 1 FIG. 1 is a flow chart of a method for determining tube current dose in a CT scanning system provided by an embodiment of the present disclosure. Figure 1 As shown, the specific process of the method for determining the tube current dose in the CT scanning system includes:

[0063] S110, constructing a body shape distribution position function of the scanning phantom.

[0064] Specifically, at any rotation angle and scanning position, the human body cross section of the scanning phantom can be approximately elliptical. According to the long axis information and short axis information of the human body cross section, the body shape distribution of the scanning phantom can be determined. For example, when the light source of the CT scanning system is located directly above the scanning bed, the long axis information of the human body cross section reflects the width information of the human body, and the short axis information of the human body cross section reflects the thickness information of the human body, or the long axis information of the human body cross section reflects the thickness information of the human body, and the short axis information of the human body cross section reflects the width information of the human body. Therefore, in the method for determining the tube current dose in the CT scanning system provided in the embodiment of the present disclosure, the body shape distribution position function of the scanning phantom is first constructed.

[0065] Specifically, the shape distribution position function of the scanned phantom satisfies:

[0066]

[0067] Where z is the scanning position of the scanning bed, θ is the rotation angle of the scanning gantry, and D l (z) is the equivalent long axis information of the scanned model when the scanning direction of the scanning bed and the scanning position of the scanning bed are z, D s (z) is the equivalent short-axis information of the scanning model when the scanning direction of the scanning bed and the scanning position of the scanning bed are z.

[0068] Specifically, the scanning direction of the scanning bed is the direction in which the scanning bed moves forward, that is, the Z direction.

[0069] When the scanning gantry rotation angle θ and the scanning bed scanning position z are determined, the body shape distribution of the scanning phantom at the scanning gantry rotation angle θ and the scanning bed scanning position z can be determined according to the body shape distribution position function of the scanning phantom.

[0070] The equivalent long-axis information and the equivalent short-axis information of the scanning phantom at different scanning positions in the scanning direction of the scanning bed are determined according to the positioning scanning image.

[0071] S120, determining a scanning bed trajectory time function of the CT scanning system according to a rotation period of a scanning gantry, a starting scanning position of a scanning bed, a pitch time function of the scanning gantry, and a collimation parameter of the CT scanning system.

[0072] In a specific implementation, the rotation period of the scanning gantry, the starting scanning position of the scanning bed, and the alignment parameters of the scanning system can all be determined when the target object triggers the scanning operation. In addition, there is a corresponding conversion relationship between the pitch time function and the pitch position function of the scanning gantry. After receiving the scanning operation triggered by the target object, the CT scanning system can determine the scanning type of this scanning based on the scanning operation, and then determine the pitch time function based on the corresponding conversion relationship between the pitch time function and the pitch position function of the scanning gantry and the pitch position function. Therefore, the scanning bed trajectory time function of the CT scanning system can be determined.

[0073] Specifically, the scanning bed trajectory time function satisfies:

[0074]

[0075] Wherein, RT is the rotation period of the scanning gantry, z0 is the starting scanning position of the scanning bed, Pitch(t) is the pitch time function, N*T is the collimation parameter, and t0 is the time corresponding to the scanning bed at the starting scanning position z0 and the scanning gantry at the starting scanning angle θ0.

[0076] Based on the scanning bed trajectory time function, the scanning position of the scanning bed at any scanning time can be determined.

[0077] S130 , determining a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of a scanning gantry in the CT scanning system.

[0078] Specifically, the scanning gantry trajectory time function satisfies:

[0079]

[0080] Where RT is the rotation period and θ0 is the starting scanning angle of the scanning gantry.

[0081] Based on the scanning gantry trajectory time function, the scanning angle of the scanning gantry at any scanning time can be determined.

[0082] S140, determining a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function.

[0083] As a specific implementation, the body shape distribution time function of the scanning phantom is determined according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function, including: determining a target scanning position of the scanning bed at a target scanning time according to the scanning bed trajectory time function; determining a target scanning angle of the scanning gantry at the target scanning time according to the scanning gantry trajectory time function; and determining the body shape distribution time function of the scanning phantom according to the target scanning position, the target scanning angle and the body shape distribution position function.

[0084] After the scanning bed trajectory time function is determined in step S120 and the scanning gantry trajectory time function is determined in step S130, when the CT scanning system is in the scanning process, the scanning time of the CT scanning system can be substituted into the scanning bed trajectory time function and the scanning gantry trajectory time function, and the target scanning position of the scanning bed at different target scanning times is determined based on the scanning bed trajectory time function, and the target scanning angle of the scanning gantry at different target scanning times is determined based on the scanning gantry trajectory time function.

[0085] For example, if the target scanning time of the CT scanning system is t1, then the target scanning position of the scanning bed at the target scanning time t1 satisfies At the target scanning time t1, the target scanning angle of the scanning rack satisfies

[0086] After determining the target scanning position of the scanning bed and the target scanning angle of the scanning gantry at the target scanning time, the body shape distribution time function of the scanning phantom at the target scanning time is determined by bringing the target scanning position and the target scanning angle into the body shape partial function of the scanning phantom determined in step S110.

[0087] Specifically, the body shape distribution time function of the scanned phantom at the target scanning time t1 satisfies:

[0088]

[0089] S150, determining a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function.

[0090] As a specific implementation, determining a target tube current modulation dose at a target scanning time according to a body shape distribution time function and a pitch time function includes: acquiring preset parameter information of a CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset current-time product at a preset scanning phantom equivalent diameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor; constructing a target tube current modulation dose time function according to the preset scanning phantom equivalent diameter, the preset current-time product at a preset scanning phantom equivalent diameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape differentiation adjustment factor, the body shape distribution time function and the pitch time function; and determining the target tube current modulation dose at the target scanning time according to the target tube current modulation dose time function.

[0091] Wherein, determining the target tube current modulation dose at the target scanning time according to the target tube current modulation dose time function includes: determining the body shape distribution parameters at the target scanning time according to the body shape distribution time function; determining the target helical pitch at the target scanning time according to the pitch time function; and determining the target tube current modulation dose at the target scanning time according to the body shape distribution parameters and the target helical pitch.

[0092] When step S140 determines the body shape distribution time function of the scanned phantom at the target scan time, the body shape distribution parameters at the target scan time are determined through the body shape distribution time function; the target pitch at the target scan time can be determined through the pitch time function, and then the target tube current modulation dose of the scanned phantom at the target scan time is determined by bringing the body shape distribution parameters and the target pitch into the tube current modulation function.

[0093] Specifically, in the specific process of determining the body shape distribution parameters at the target scanning time according to the body shape distribution time function: according to the positioning scanning image, the equivalent major axis information and the equivalent minor axis information at the target scanning position and the target scanning angle are obtained, and the obtained equivalent major axis information and the equivalent minor axis information at the target scanning position and the target scanning angle and the target scanning angle are brought into the body shape distribution time function to obtain the body shape distribution parameter width(t1).

[0094] Specifically, the target tube current modulation function satisfies:

[0095] mA(t)=mA ref *Pitch(t)*exp[mu*(width(t)-WED)]*exp[mu*(WED-WED ref )*Coe]

[0096] Among them, mA ref is the preset current-time product under the preset scanning phantom equivalent diameter, mu is the linear attenuation coefficient of water, WEDref is the preset equivalent diameter of the scanning model, and Coe is the body shape difference adjustment factor, which is used to adjust the body shape deviation from WED ref In this case, WED is the coefficient of mA compensation amplitude, and WED is the average equivalent diameter of the scanning phantom at the scanning angle corresponding to the target scanning time t.

[0097] After the body shape distribution parameters and the target helical pitch of the target phantom at the target scanning time are determined, the target tube current modulation dose at the target scanning time can be determined by bringing the body shape distribution parameters and the target helical pitch into the target tube current modulation function.

[0098] The method for determining tube current dose in a CT scanning system provided by an embodiment of the present disclosure first constructs a body shape distribution position function of a scanning phantom; determines a scanning bed trajectory time function of the CT scanning system according to a rotation period of a scanning gantry, a starting scanning position of a scanning bed, a pitch time function of the scanning gantry, and collimation parameters in the CT scanning system; determines a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system; then determines a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function, and a body shape distribution position function; and finally determines a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function of the scanning phantom. By constructing a scanning bed trajectory time function and a scanning gantry trajectory function, the target scanning position of the scanning bed and the target scanning angle of the scanning gantry at the target scanning time are determined. Then, by substituting the target scanning position and the target scanning angle into the body shape distribution position function of the scanning phantom, the body shape distribution time function at the target scanning time is determined. Finally, by substituting the target scanning time into the body shape distribution time function and the pitch time function, the target tube current modulation dose at the target scanning time is determined. The tube current modulation dose is determined based on the body shape distribution and the scanning pitch of the scanning phantom, thereby ensuring the modulation of the tube current dose of patients with different body shape distributions under the variable pitch spiral scanning mode, thereby ensuring the quality of the scanned image.

[0099] Based on the above embodiments, Figure 2 FIG. 1 is a flow chart of another method for determining tube current dose in a CT scanning system provided by an embodiment of the present disclosure. Figure 2 As shown, before executing step S110, the process further includes:

[0100] S101 : In response to receiving a scanning operation submitted by a target object, a positioning scanning image of a scanning phantom is acquired.

[0101] S102: Determine scanning information according to the positioning scanning image.

[0102] The scanning information includes a start scanning position and an end scanning position.

[0103] S103 . Determine an average equivalent diameter of the scanning phantom according to the positioning scanning image and the scanning information.

[0104] In a specific embodiment, the average equivalent diameter of the scanning phantom is determined based on the positioning scanning image and the scanning information, including: determining the equivalent major axis information and the equivalent minor axis information of the scanning phantom at different scanning positions in the scanning direction of the scanning bed based on the positioning scanning image; determining the average equivalent diameter of the scanning phantom in the scanning direction of the scanning bed based on the equivalent major axis information and the equivalent minor axis information at different scanning positions in the scanning direction of the scanning bed and the starting scanning position and the ending scanning position.

[0105] It should be noted that, in the above embodiment, the scanning direction of the scanning bed refers to the equivalent long-axis information and the equivalent short-axis information of the scanning phantom when the line connecting the light source and the detector module is perpendicular to the scanning bed.

[0106] Specifically, by acquiring a positioning scan image, determining the starting scan position and the ending scan position based on the positioning scan image, and then solving the average value of the equivalent diameters of the scanning phantom at different scanning positions between the starting scan position and the ending scan position in the scanning direction of the scanning bed, the average equivalent diameter of the scanning phantom at the scanning angle is obtained.

[0107] Specifically, the average equivalent diameter of the scanned phantom at a certain scanning angle satisfies:

[0108]

[0109] The value range of z is from z0 to z, where z0 is the starting scanning position of the scanning bed and z is the ending scanning position of the scanning bed.

[0110] In addition, in the embodiment of the present disclosure, when executing step S101, it also includes: obtaining the scanning type included in the scanning operation; obtaining the pitch position function corresponding to the scanning type and the pitch position-time function conversion parameters corresponding to the scanning type; determining the pitch-time function according to the pitch position function and the pitch position-time function conversion parameters corresponding to the scanning type.

[0111] When the target object triggers a scanning operation, the pitch function obtained is the pitch position function, i.e., Pitch(z). The pitch position function and the pitch position-time function conversion parameters are different for different scanning modes. Therefore, when the target object triggers a scanning operation, the scanning type corresponding to the scanning operation is first obtained. Then, according to the scanning type corresponding to the scanning operation, the pitch position function corresponding to the scanning type and the pitch position-time function conversion parameters corresponding to the scanning type are obtained. Finally, the pitch time function, i.e., Pitch(t), is determined through the pitch position function and the pitch position-time function conversion parameters corresponding to the scanning type.

[0112] Based on the above embodiments, Figure 3 FIG. 1 is a schematic diagram of a tube current dose determination device in a CT scanning system provided by an embodiment of the present disclosure. Figure 3 As shown, the tube current dose determination device in the CT scanning system includes:

[0113] A body shape distribution position function construction module 310 is used to construct a body shape distribution position function of a scanning phantom;

[0114] A scanning bed trajectory time function determination module 320 is used to determine the scanning bed trajectory time function of the CT scanning system according to the rotation period of the scanning gantry, the starting scanning position of the scanning bed, the pitch time function of the scanning gantry and the collimation parameters in the CT scanning system;

[0115] A scanning gantry trajectory time function determination module 330 is used to determine a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system;

[0116] A body shape distribution time function determination module 340 is used to determine a body shape distribution time function of a scanning phantom according to a scanning bed trajectory time function, a scanning gantry trajectory time function and a body shape distribution position function;

[0117] The target tube current modulation dose determination module 350 is used to determine the target tube current modulation dose at the target scanning time according to the body shape distribution time function and the pitch time function.

[0118] The tube current dose determination device in the CT scanning system provided by the embodiment of the present disclosure first constructs a body shape distribution position function of a scanning phantom; determines a scanning bed trajectory time function of the CT scanning system according to a rotation period of a scanning gantry, a starting scanning position of a scanning bed, a pitch time function of the scanning gantry and collimation parameters in the CT scanning system; determines a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system; then determines a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function; and finally determines a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function of the scanning phantom. By constructing a scanning bed trajectory time function and a scanning gantry trajectory function, the target scanning position of the scanning bed and the target scanning angle of the scanning gantry at the target scanning time are determined. Then, by substituting the target scanning position and the target scanning angle into the body shape distribution position function of the scanning phantom, the body shape distribution time function at the target scanning time is determined. Finally, by substituting the target scanning time into the body shape distribution time function and the pitch time function, the target tube current modulation dose at the target scanning time is determined. The tube current modulation dose is determined based on the body shape distribution and the scanning pitch of the scanning phantom, thereby ensuring the modulation of the tube current dose of patients with different body shape distributions under the variable pitch spiral scanning mode, thereby ensuring the quality of the scanned image.

[0119] In a specific embodiment, the scanning bed trajectory time function of the CT scanning system satisfies:

[0120]

[0121] Wherein, RT is the rotation period of the scanning gantry, z0 is the starting scanning position of the scanning bed, Pitch(t) is the pitch time function, and N*T is the collimation parameter;

[0122] The scanning gantry trajectory time function of the CT scanning system satisfies:

[0123]

[0124] Where RT is the rotation period and θ0 is the starting scanning angle of the scanning gantry.

[0125] In a specific embodiment, determining a target tube current modulation dose at a target scanning time according to a body size distribution time function and a pitch time function includes:

[0126] Acquiring preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset current-time product under the preset scanning phantom equivalent diameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor;

[0127] A target tube current modulation dose time function is constructed according to a preset scanning phantom equivalent diameter, a preset current time product under the preset scanning phantom equivalent diameter, a scanning gantry rotation period, a linear attenuation coefficient of water, a body shape difference adjustment factor, a body shape distribution time function and a pitch time function;

[0128] The target tube current modulation dose at the target scanning time is determined according to the target tube current modulation dose time function.

[0129] In a specific embodiment, determining a target tube current modulation dose at a target scanning time according to a target tube current modulation dose time function includes:

[0130] Determine the body size distribution parameters at the target scanning time according to the body size distribution time function;

[0131] Determining a target pitch at a target scanning time according to the pitch-time function;

[0132] The target tube current modulation dose at the target scanning time is determined according to the body shape distribution parameter and the target helical pitch.

[0133] In a specific implementation, before constructing the body shape distribution position function of the scanning phantom, the method further includes:

[0134] In response to receiving a scanning operation submitted by the target object, acquiring a positioning scanning image of the scanning phantom;

[0135] Determining scanning information according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position;

[0136] The average equivalent diameter of the scanning phantom is determined according to the positioning scanning image and the scanning information.

[0137] In a specific embodiment, determining the average equivalent diameter of the scanning phantom according to the positioning scanning image and the scanning information includes:

[0138] Determine the equivalent long-axis information and the equivalent short-axis information of the scanning phantom at different scanning positions in the scanning direction of the scanning bed according to the positioning scanning image;

[0139] According to the equivalent long axis information and the equivalent short axis information at different scanning positions in the scanning direction of the scanning bed, as well as the start scanning position and the end scanning position, the average equivalent diameter of the scanning phantom in the scanning direction of the scanning bed is determined.

[0140] In a specific embodiment, when obtaining the positioning scanning image of the scanning phantom, the method further includes:

[0141] Get the scan type included in the scan operation;

[0142] Obtaining a pitch position function corresponding to the scanning type and a pitch position-time function conversion parameter corresponding to the scanning type;

[0143] The pitch-time function is determined according to the pitch-position function and a pitch-position-time function conversion parameter corresponding to the scanning type.

[0144] The present application also provides a computer device. Figure 4 , Figure 4 This is a basic structural block diagram of the computer device in this embodiment.

[0145] 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), programmable gate arrays (Field-Programmable Gate Array, FPGA), digital processors (Digital Signal Processor, DSP), embedded devices, etc.

[0146] 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.

[0147] 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 (e.g., 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] For the definitions of memory and processor, please refer to the description of the aforementioned computer device embodiment and will not be repeated here.

[0153] 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.

[0154] 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.

[0155] 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 is essentially 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, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program code.

[0156] 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.

[0157] 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.

[0158] 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 method for determining tube current dose in a CT scanning system, characterized in that: include: Constructing the body shape distribution position function of the scanning phantom; Determine a scanning bed trajectory time function of the CT scanning system according to a rotation period of a scanning gantry, a starting scanning position of a scanning bed, a pitch time function of the scanning gantry and a collimation parameter in the CT scanning system; Determine a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system; Determining a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function; determining a target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function; Wherein, determining the target tube current modulation dose at the target scanning time according to the body shape distribution time function and the pitch time function comprises: Acquiring preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset current-time product under the preset scanning phantom equivalent diameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor; Constructing a target tube current modulation dose time function according to the preset scanning phantom equivalent diameter, the preset current time product under the preset scanning phantom equivalent diameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution time function and the pitch time function; determining a target tube current modulation dose at a target scanning time according to the target tube current modulation dose-time function; Determining the target tube current modulation dose at the target scanning time according to the target tube current modulation dose time function includes: determining a body size distribution parameter at the target scanning time according to the body size distribution time function; Determining a target pitch at the target scanning time according to the pitch-time function; A target tube current modulation dose at a target scanning time is determined according to the body shape distribution parameter and the target helical pitch.

2. The method according to claim 1, characterized in that: The scanning bed trajectory time function of the CT scanning system satisfies: Wherein, RT is the rotation period of the scanning gantry, z0 is the starting scanning position of the scanning bed, Pitch(t) is the pitch time function, and N*T is the collimation parameter; The scanning gantry trajectory time function of the CT scanning system satisfies: Where RT is the rotation period and θ0 is the starting scanning angle of the scanning gantry.

3. The method according to claim 1, characterized in that: Before constructing the body shape distribution position function of the scanning phantom, the method further includes: In response to receiving a scanning operation submitted by the target object, acquiring a positioning scanning image of the scanning phantom; Determining scanning information according to the positioning scanning image, wherein the scanning information includes a starting scanning position and an ending scanning position; An average equivalent diameter of the scanning phantom is determined according to the positioning scanning image and the scanning information.

4. The method according to claim 3, characterized in that The step of determining the average equivalent diameter of the scanning phantom according to the positioning scanning image and the scanning information includes: Determine, according to the positioning scan image, equivalent long-axis information and equivalent short-axis information of the scanning phantom at different scanning positions in the scanning direction of the scanning bed; According to the equivalent long axis information and the equivalent short axis information at different scanning positions in the scanning direction of the scanning bed, as well as the start scanning position and the end scanning position, an average equivalent diameter of the scanning phantom in the scanning direction of the scanning bed is determined.

5. The method according to claim 3, characterized in that: The step of acquiring the positioning scanning image of the scanning phantom further includes: Obtaining a scan type included in the scan operation; Acquire a pitch position function corresponding to the scanning type and a pitch position-time function conversion parameter corresponding to the scanning type; The pitch-time function is determined according to the pitch-position function and a pitch-position-time function conversion parameter corresponding to the scanning type.

6. A device for determining tube current dose in a CT scanning system, characterized in that: include: A body shape distribution position function construction module is used to construct a body shape distribution position function of a scanning phantom; A scanning bed trajectory time function determination module is used to determine the scanning bed trajectory time function of the CT scanning system according to the rotation period of the scanning gantry, the starting scanning position of the scanning bed, the pitch time function of the scanning gantry and the collimation parameters in the CT scanning system; A scanning gantry trajectory time function determination module, used to determine a scanning gantry trajectory time function of the CT scanning system according to a starting scanning angle and a rotation period of the scanning gantry in the CT scanning system; a body shape distribution time function determination module, configured to determine a body shape distribution time function of the scanning phantom according to the scanning bed trajectory time function, the scanning gantry trajectory time function and the body shape distribution position function; A target tube current modulation dose determination module, used to determine the target tube current modulation dose at a target scanning time according to the body shape distribution time function and the pitch time function; Wherein, determining the target tube current modulation dose at the target scanning time according to the body shape distribution time function and the pitch time function comprises: Acquiring preset parameter information of the CT scanning system, wherein the preset parameter information includes a preset scanning phantom equivalent diameter, a preset current-time product under the preset scanning phantom equivalent diameter, a scanning gantry rotation period, a linear attenuation coefficient of water, and a body shape differentiation adjustment factor; Constructing a target tube current modulation dose time function according to the preset scanning phantom equivalent diameter, the preset current time product under the preset scanning phantom equivalent diameter, the scanning gantry rotation period, the linear attenuation coefficient of water, the body shape difference adjustment factor, the body shape distribution time function and the pitch time function; determining a target tube current modulation dose at a target scanning time according to the target tube current modulation dose-time function; Determining the target tube current modulation dose at the target scanning time according to the target tube current modulation dose time function includes: determining a body size distribution parameter at the target scanning time according to the body size distribution time function; Determining a target pitch at the target scanning time according to the pitch-time function; A target tube current modulation dose at a target scanning time is determined according to the body shape distribution parameter and the target helical pitch.

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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