Tomographic imaging system and method based on distributed ray source assembly

Abstract

Provided is a tomography system based on a distributed radiation source assembly, comprising: a base body; a distributed radiation source assembly arranged on the base body, comprising a radiation source mounting body and a distributed radiation source unit arranged on the radiation source mounting body, the distributed radiation source unit comprising a plurality of focal points; a detector configured to record radiation projection data generated by radiation emitted by at least one focal point; and an imaging device configured to process the radiation projection data using a tomographic synthesis reconstruction method to generate a radiation image. At least a portion of the distributed radiation source assembly is capable of rotating about a rotation axis so that the plurality of focal points are capable of rotating about the rotation axis, the rotation axis passing through the distributed radiation source assembly itself. The present disclosure also provides a tomography method.

Description

Technical Field

[0001] This disclosure relates to the field of X-ray scanning imaging technology, and in particular to a tomographic imaging system and method based on a distributed X-ray source assembly. Background Technology

[0002] Mobile DR (digital radiography, abbreviated as DR) is a digital, high-frequency, mobile X-ray imaging medical diagnostic device. Compared to traditional fixed (e.g., floor-standing, suspended) digital DR, mobile DR occupies less space, offers flexible positioning, and has a simpler and faster imaging process. It supports multiple bedside examinations and has diverse clinical applications, providing convenience for bedside examinations in various departments of hospitals at all levels, such as ICU, emergency department, pediatrics, operating room, thoracic surgery, and orthopedics. It can also be used in various scenarios such as outpatient emergency care and large-scale physical examinations. However, current mobile DR equipment can only achieve 2D imaging, characterized by overlapping images of various tissue structures, making it difficult to present depth information of lesions. Achieving 3D tomographic imaging requires overcoming difficulties such as poor tomographic image quality, slow scanning speed, and complex system geometric calibration. Summary of the Invention

[0003] To address the aforementioned technical problems, this disclosure provides a tomographic imaging system and method based on a distributed X-ray source assembly.

[0004] In view of at least one of the above-mentioned technical problems, the present invention provides a tomographic imaging system and method based on a distributed X-ray source assembly.

[0005] According to a first aspect of this disclosure, a tomographic imaging system based on a distributed radiation source assembly is provided, comprising: a substrate; a distributed radiation source assembly disposed on the substrate, the distributed radiation source assembly including a radiation source mounting body and distributed radiation source units disposed on the radiation source mounting body, the distributed radiation source units including a plurality of focal points configured to emit radiation respectively; a detector configured to record radiation projection data, wherein the radiation projection data is generated by radiation emitted by at least one of the focal points; and an imaging device disposed on or separately from the substrate, the imaging device being electrically connected to the detector, the imaging device being configured to process the radiation projection data using a tomographic synthesis reconstruction method to generate a radiation image, wherein at least a portion of the distributed radiation source assembly is rotatable about a rotation axis such that the plurality of focal points are rotatable about the rotation axis, the rotation axis passing through the distributed radiation source assembly itself.

[0006] According to some exemplary embodiments, the detector and the distributed radiation source assembly are arranged along the extension direction of the rotation axis.

[0007] According to some exemplary embodiments, the tomographic imaging system further includes a control device disposed on or separately from the substrate, the control device being electrically connected to the distributed X-ray source assembly, and the control device being configured to: control the X-ray beam output from multiple focal points of the distributed X-ray source unit, and control the distributed X-ray source assembly to rotate about the rotation axis.

[0008] According to some exemplary embodiments, the tomographic imaging system is configured to: under the control of the control device, perform tomographic imaging using a first scanning mode, wherein, in the first scanning mode, at least two focal points in the distributed X-ray source assembly sequentially emit X-rays, and the detector records first X-ray projection data; after the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed X-ray source assembly sequentially emit X-rays, and the detector records second X-ray projection data; the imaging device processes the first X-ray projection data and the second X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0009] According to some exemplary embodiments, the tomographic imaging system is configured to: under the control of the control device, switch between a first scanning mode and a second scanning mode or a third scanning mode, wherein, in the first scanning mode, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records first radiation projection data; after the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records second radiation projection data; the imaging device processes the first radiation projection data and the second radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; in the second scanning mode, at least two focal points in the distributed radiation source assembly sequentially emit radiation, the detector records third radiation projection data, and the imaging device processes the third radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; or, in the third scanning mode, one focal point in the distributed radiation source assembly emits radiation, the detector records fourth radiation projection data, and the imaging device processes the fourth radiation projection data to generate a digital radiation image.

[0010] According to some exemplary embodiments, the tomographic imaging system is configured to switch between a first scanning mode, a second scanning mode, and a third scanning mode under the control of the control device. In the first scanning mode, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records first radiation projection data. After the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records second radiation projection data. The imaging device processes the first radiation projection data and the second radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image. In the second scanning mode, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records third radiation projection data. The imaging device processes the third radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image. In the third scanning mode, one focal point in the distributed radiation source assembly emits radiation, the detector records fourth radiation projection data, and the imaging device processes the fourth radiation projection data to generate a digital radiation image.

[0011] According to some exemplary embodiments, the radiation source mount includes a fixed portion and a rotating portion, the rotating portion being rotatable relative to the fixed portion about a rotation axis that extends through the rotating portion.

[0012] According to some exemplary embodiments, the distributed radiation source assembly includes one distributed radiation source unit, wherein a plurality of focal points of the distributed radiation source unit are symmetrically distributed on the rotating part with respect to the rotation axis; or, the distributed radiation source assembly includes a plurality of distributed radiation source units, wherein the plurality of distributed radiation source units are symmetrically distributed on the rotating part with respect to the rotation axis.

[0013] According to some exemplary embodiments, the rotating part includes a rotating disk.

[0014] According to some exemplary embodiments, the tomographic imaging system further includes a movable mechanism on which the substrate is disposed, the movable mechanism being configured to drive the substrate to move.

[0015] According to some exemplary embodiments, the tomographic imaging system further includes a degree-of-freedom device, the degree-of-freedom device having opposing first and second ends, the first end of the degree-of-freedom device being connected to the substrate, and the second end of the degree-of-freedom device being connected to the distributed X-ray source assembly.

[0016] According to some exemplary embodiments, the distributed X-ray source assembly is capable of rotating about at least two independent axes defined by the degree of freedom device to align the distributed X-ray source assembly relative to the imaging object.

[0017] According to some exemplary embodiments, the degree-of-freedom device includes a first arm and a second arm, a first end of the first arm being connected to the base, a second end of the first arm being hinged to the first end of the second arm, and a second end of the second arm being connected to the fixing part.

[0018] According to some exemplary embodiments, the tomographic imaging system is configured to switch between four scanning modes—a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode—under the control of the control device. In the first scanning mode, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records first radiation projection data. After the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records second radiation projection data. The imaging device processes the first radiation projection data and the second radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image. In the second scanning mode, at least two focal points in the distributed radiation source assembly sequentially emit radiation, and the detector records third radiation projection data. The imaging device processes the third ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image. In the third scanning mode, one focal point of the distributed ray source assembly emits rays, the detector records fourth ray projection data, and the imaging device processes the fourth ray projection data to generate a digital ray image. In the fourth scanning mode, at least two focal points of the distributed ray source assembly emit rays sequentially, and the detector records first ray projection data. After the distributed ray source assembly is driven to a predetermined position using the degree-of-freedom device, at least two focal points of the distributed ray source assembly emit rays sequentially, and the detector records fifth ray projection data. The imaging device processes the first ray projection data and the fifth ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0019] According to some exemplary embodiments, the detector is connected to the distributed radiation source assembly via a connecting arm, or the detector is separately disposed from the distributed radiation source assembly; and / or the detector and the distributed radiation source assembly are respectively located on both sides of the imaging object in the extension direction of the rotation axis, or at least a portion of the detector is located within the imaging object.

[0020] According to some exemplary embodiments, the tomographic imaging system further includes a calibration device for calibrating the relative positional relationship between the individual focal points of the distributed radiation source assembly and the detector.

[0021] According to some exemplary embodiments, the control device is disposed inside the substrate and is electrically connected to the distributed radiation source assembly via cables passing through the interior of the first and second arms.

[0022] According to some exemplary embodiments, the tomographic imaging system further includes an operation unit configured to be operated by a user of the system so that the user can select a scanning mode.

[0023] According to some exemplary embodiments, the operating unit includes physical operating buttons; and / or, the operating unit includes a user interface displayed on a display screen.

[0024] According to some exemplary embodiments, the tomographic imaging system further includes a pusher configured to be operated by a user of the system so that the user can move the tomographic imaging system; and the tomographic imaging system includes opposing first and second sides, with the connection between the degree-of-freedom device and the substrate located on the first side and the pusher located on the second side.

[0025] According to some exemplary embodiments, the movable mechanism includes a plurality of movable wheels, wherein the diameter of at least one movable wheel located on the second side is greater than the diameter of at least one movable wheel located on the first side.

[0026] According to a second aspect of this disclosure, a tomographic imaging system based on a distributed radiation source assembly is provided, comprising: a substrate; a distributed radiation source assembly disposed on the substrate, the distributed radiation source assembly including a radiation source mounting body and distributed radiation source units disposed on the radiation source mounting body, the distributed radiation source units including a plurality of focal points configured to emit radiation rays respectively; and an imaging device disposed on or separately from the substrate, the imaging device being configured to: process radiation projection data using a tomographic synthesis reconstruction method to generate a radiation image, wherein the radiation projection data is data generated by detecting radiation rays emitted from at least one of the focal points and transmitted through an imaging object, wherein the radiation source mounting body includes a fixed portion and a rotating portion, the rotating portion being rotatable relative to the fixed portion about a rotation axis extending through the rotating portion itself, such that the plurality of focal points are rotatable about the rotation axis.

[0027] According to some exemplary embodiments, the tomographic imaging system further includes a detector configured to record the X-ray projection data; and the distributed X-ray source assembly, at least a portion of the imaging object, and the detector arranged along the extension direction of the rotation axis.

[0028] According to a third aspect of this disclosure, a tomographic imaging method based on a distributed X-ray source assembly is provided. The distributed X-ray source assembly includes multiple focal points. The tomographic imaging method includes: controlling at least two focal points in the distributed X-ray source assembly to sequentially emit X-rays; in response to the emission of the X-rays, a detector recording first X-ray projection data; controlling the multiple focal points to rotate around a rotation axis by a predetermined angle, wherein the rotation axis passes through the distributed X-ray source assembly itself; after rotating by the predetermined angle, controlling at least two focal points in the distributed X-ray source assembly to sequentially emit X-rays again; in response to the re-emission of the X-rays, the detector recording second X-ray projection data; and processing the first X-ray projection data and the second X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0029] According to a fourth aspect of this disclosure, an imaging method based on a distributed radiation source assembly is provided, the distributed radiation source assembly including a plurality of focal points, the imaging method comprising: in response to a user operation, performing radiation imaging on an imaging object using at least one of a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode, wherein, in the first scanning mode, at least two focal points in the distributed radiation source assembly are controlled to sequentially emit radiation; in response to the emission of the radiation, a detector records first radiation projection data; controlling the plurality of focal points to rotate around a rotation axis by a predetermined angle, wherein the rotation axis passes through the distributed radiation source assembly itself; after rotating by the predetermined angle, controlling at least two focal points in the distributed radiation source assembly to sequentially emit radiation again; in response to the re-emission of the radiation, the detector records second radiation projection data; and processing the first radiation projection data and the second radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; in the second scanning mode... In the third scanning mode, at least two focal points in the distributed radiation source assembly are controlled to emit radiation sequentially; in response to the emission of the radiation, a detector records third radiation projection data; and the third radiation projection data is processed using a tomographic synthesis and reconstruction method to generate a tomographic image. In the third scanning mode, one focal point in the distributed radiation source assembly is controlled to emit radiation; in response to the emission of the radiation, the detector records fourth radiation projection data and processes the fourth radiation projection data to generate a digital radiation image. In the fourth scanning mode, at least two focal points in the distributed radiation source assembly emit radiation sequentially, and the detector records first radiation projection data. After the distributed radiation source assembly is driven to a predetermined position using the degree-of-freedom device, at least two focal points in the distributed radiation source assembly emit radiation sequentially, and the detector records fifth radiation projection data. The imaging device processes the first radiation projection data and the fifth radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0030] In the embodiments of this disclosure, a tomographic imaging system and method based on a multifocal distributed X-ray source are provided. The multifocal distributed X-ray source has advantages such as transient response and programmable pulse emission, and can achieve three-dimensional imaging by scanning from multiple angles quickly. Furthermore, the distributed X-ray source component can rotate around its own axis (i.e., perform self-rotation), which can perform precise scanning to improve the quality of three-dimensional images. Attached Figure Description

[0031] Figure 1A and Figure 1B These are schematic diagrams of the structure of a tomographic imaging system according to some exemplary embodiments of the present disclosure, wherein, Figure 1A The schematic diagram shows the structure of a tomographic imaging system in its deployed state. Figure 1BA schematic diagram of the structure of a tomographic imaging system in its non-deployed state is shown.

[0032] Figure 2 This is a hardware block diagram of a tomographic imaging system according to some exemplary embodiments of the present disclosure;

[0033] Figure 3A , Figure 3B and Figure 3C These are schematic diagrams of the structure of a distributed radiation source component according to some exemplary embodiments of the present disclosure;

[0034] Figure 4A and Figure 4B These are schematic diagrams of the detector structure according to some exemplary embodiments of the present disclosure;

[0035] Figure 5 This is a schematic diagram of the structure of a tomographic imaging system according to some other exemplary embodiments of the present disclosure;

[0036] Figure 6A , Figure 6B and Figure 6C The relative positions of the distributed radiation source assembly, the imaging object, and the detector are schematically shown respectively according to some exemplary embodiments of the present disclosure;

[0037] Figure 7A , Figure 7B , Figure 7C and Figure 7D These are schematic diagrams of the structure of a calibration apparatus for the tomographic imaging system according to exemplary embodiments of the present disclosure, wherein... Figures 7A-7C This is a side view. Figure 7D This is a floor plan;

[0038] Figure 8 This is a flowchart of a tomographic imaging method according to some exemplary embodiments of the present disclosure; and

[0039] Figure 9 This is a flowchart of an imaging method according to some exemplary embodiments of the present disclosure. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0041] However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of this disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of embodiments of this disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known technologies are omitted in the following description to avoid unnecessarily obscuring the concepts of this disclosure.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The term "comprising" as used herein indicates the presence of features, steps, or operations, but does not exclude the presence or addition of one or more other features.

[0043] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0044] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0045] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0046] In this disclosure, digital radiography (DR) imaging refers to a technique that directly performs digital radiography under computer control. For example, an amorphous silicon flat panel detector can be used to convert the X-ray information penetrating the object being detected into a digital signal, and the computer can reconstruct the image and perform a series of image post-processing to generate a digital radiographic image of the scanned object.

[0047] Computed tomography (CT) imaging refers to the process of using X-rays to perform a tomographic scan of the object being examined. The analog signals received by the detector are then converted into digital signals, and the attenuation coefficient of each pixel is calculated by a computer to reconstruct the image, thereby displaying the tomographic structure of each part of the object being examined.

[0048] According to some embodiments of this disclosure, a tomographic imaging system based on a distributed radiation source assembly is provided, comprising: a substrate; a distributed radiation source assembly disposed on the substrate, the distributed radiation source assembly including a radiation source mounting body and a distributed radiation source unit disposed on the radiation source mounting body, the distributed radiation source unit including a plurality of focal points configured to emit radiation respectively; a detector configured to record radiation projection data, wherein the radiation projection data is generated by radiation emitted by at least one of the focal points; and an imaging device disposed on or separately from the substrate, the imaging device being electrically connected to the detector, the imaging device being configured to process the radiation projection data using a tomographic synthesis reconstruction method to generate a radiation image, wherein at least a portion of the distributed radiation source assembly is rotatable about a rotation axis such that the plurality of focal points are rotatable about the rotation axis, the rotation axis passing through the distributed radiation source assembly itself. In the embodiments of this disclosure, a tomographic imaging system based on a multifocal distributed X-ray source is provided. The multifocal distributed X-ray source has advantages such as transient response and programmable pulse emission, and can achieve three-dimensional imaging by scanning from multiple angles quickly. Furthermore, the distributed X-ray source component can rotate around its own axis (i.e., perform self-rotation), which can perform precise scanning to improve the quality of three-dimensional images.

[0049] Figure 1A and Figure 1B These are schematic diagrams of the structure of a tomographic imaging system according to some exemplary embodiments of the present disclosure, wherein, Figure 1A The schematic diagram shows the structure of a tomographic imaging system in its deployed state. Figure 1B The schematic diagram shows the structure of a tomographic imaging system in its non-deployed state. Figure 2 This is a hardware block diagram of a tomographic imaging system according to some exemplary embodiments of the present disclosure.

[0050] Combined with reference Figure 1A , Figure 1B and Figure 2 The tomographic imaging system 100 according to some exemplary embodiments of the present disclosure may include a substrate 1, a distributed radiation source assembly 2, a detector 3, and an imaging device 4.

[0051] In embodiments of this disclosure, the substrate 1 serves as the base for mounting other components in the tomographic imaging system 100, such as the distributed radiation source assembly 2, which can be mounted on the substrate 1. For example, the substrate provides a stable mounting base for other components such as the distributed radiation source assembly 2, the detector 3, and the imaging device 4, ensuring the accuracy and stability of the relative positions of each component during operation.

[0052] In some exemplary embodiments, the substrate 1 may include a thin shell and a receiving space surrounded by the thin shell; that is, the substrate 1 may have a hollow structure, and some other components may be disposed within the receiving space. For example, the thin shell may be made of a high-strength material, such as carbon fiber reinforced composite material, stainless steel, aluminum alloy, etc. The hollow structure of the substrate, while ensuring a certain structural strength, can effectively reduce the weight of the entire tomographic imaging system, which is beneficial for installing other components, thereby facilitating system movement and component installation layout. It should be noted that the embodiments of this disclosure are not limited thereto; in optional embodiments, the substrate 1 may have other types of structures.

[0053] In some exemplary embodiments, the substrate 1 may have a cart shape, which facilitates movement between different working positions, improving the system's mobility and flexibility. Furthermore, the cart-shaped substrate 1 may be equipped with suitable wheels or a moving device at its bottom, allowing operators to easily push or pull the substrate 1 to the target position for imaging operations. It should be noted that the embodiments disclosed herein are not limited to this. In optional embodiments, the substrate 1 may have other shapes, such as square, circular, elliptical, or irregular shapes, and can be customized according to specific usage scenarios and space constraints to meet the diverse application needs of the tomographic imaging system 100.

[0054] It should be understood that the primary function of the substrate 1 is to provide a stable support structure for the system. Through precisely designed mounting interfaces and positioning structures, it ensures the accurate installation and fixation of components such as the distributed radiation source assembly 2, detector 3, and imaging device 4. Furthermore, the substrate 1 may also be equipped with appropriate cable channels and interfaces to facilitate electrical connections and signal transmission within the system.

[0055] It should be noted that, regardless of the shape and structural form adopted, the substrate 1 must possess sufficient strength and rigidity to support components such as the distributed X-ray source assembly 2, detector 3, and imaging device 4, and to resist potential external interference such as vibration and impact during system operation, ensuring the normal operation and imaging accuracy of the imaging system. Simultaneously, the substrate 1 should have precisely designed mounting interfaces and positioning structures to facilitate accurate and convenient installation of other components, ensuring that the relative positional accuracy between components meets the technical requirements of the tomographic imaging system 100.

[0056] Figure 3A , Figure 3B and Figure 3C These are schematic diagrams of the structure of a distributed radiation source component according to some exemplary embodiments of the present disclosure.

[0057] Combined with reference Figures 1A to 3C The distributed radiation source assembly 2 can be disposed on the base 1. The distributed radiation source assembly 2 may include a radiation source mounting body 21 and distributed radiation source units 22 disposed on the radiation source mounting body 21. For example, as shown... Figure 3A As shown, the distributed radiation source assembly 2 may include a distributed radiation source unit 22, which may include a plurality of focal points 220 configured to emit radiation, for example, X-rays, respectively. For example, as... Figure 3B and Figure 3C As shown, the distributed radiation source assembly 2 may include a plurality of distributed radiation source units 22, each of which may include a plurality of focal points 220, the plurality of focal points 220 being configured to emit radiation, for example, X-rays.

[0058] In embodiments of this disclosure, the distributed X-ray source unit includes multiple focal points. For example, multiple X-ray focal points can be arranged in a high density within a single X-ray tube vacuum cavity. Compared to a traditional single X-ray source, the distributed X-ray source unit has multiple independent X-ray emission points, which can operate independently and be controlled individually. For example, the distributed X-ray source developed by the applicant of this application can integrate hundreds of X-ray focal points within a single X-ray tube, each of which can be independently controlled and quickly switched as needed. For example, the emission of each focal point can be precisely controlled, including parameters such as X-ray intensity and emission time, allowing for flexible adjustment of the X-ray output based on different scanning locations, object density, and other factors during X-ray scanning, thereby obtaining higher-quality images. For example, the intensity distribution of the X-ray beam can be modulated by controlling the X-ray intensity of different focal points to adapt to the imaging requirements of different objects. Furthermore, by employing a multi-focal distributed X-ray source, rapid scanning imaging capabilities can be achieved. Due to the presence of multiple X-ray focal points, the distributed X-ray source can simultaneously or rapidly scan the target object sequentially from multiple different locations, greatly improving the scanning speed. Compared to traditional slip-ring CT scans, this method can acquire complete image information of an object in a shorter time, which is of great significance for scenarios requiring rapid imaging, such as medical emergencies and security checks. Furthermore, it can achieve high-quality imaging results; the coordinated operation of multiple focal points and precise control capabilities allow the distributed X-ray source to provide higher resolution and lower noise images. When imaging complex objects or minute structures, it can more clearly reveal the internal structure and details of the object, providing more accurate information for doctors' diagnoses or other applications.

[0059] In embodiments of this disclosure, the distributed X-ray source assembly 2 can be configured to direct a X-ray beam toward a location or position where an imaging object is placed, specifically toward a region of interest. The X-ray beam can be directed toward this location or position from multiple different angles. Additionally, the distributed X-ray source assembly 2, detector 3, and imaging object can be positioned such that the generated X-ray beam is detected by detector 3. In some embodiments, the distributed X-ray source assembly 2 can include a plurality of focal points 220, which can be arranged in a spatially distributed array. This spatially distributed array is positioned such that the generated X-ray beam is generally directed toward the imaging object and can pass through the region of interest of the imaging object.

[0060] In some embodiments, the multiple focal points of the distributed X-ray source assembly 2 may include multiple individually programmable focal points distributed in a linear array. Optionally, the multiple focal points of the distributed X-ray source assembly 2 may be distributed non-linearly in a two-dimensional matrix, such as an arc, a circle, a polygon, etc. In some embodiments, the multiple focal points in the spatially distributed array may be uniformly spaced and / or angled to guide the X-ray beam toward the region of interest of the imaging object. For example, the multiple focal points in the spatially distributed array may be arranged at any suitable location such that the X-ray beam is generally guided toward the object and detected by the detector 3. It should be noted that the distributed X-ray source assembly 2 and the detector 3 may be stationary relative to each other during the imaging of the object by the multiple focal points 220 and by the detection of the object by the detector 3. The multiple focal points 220 may be activated sequentially with respect to a predetermined dwell time and a predetermined X-ray dose level.

[0061] For example, a distributed X-ray source unit 22 may include between 10 and 10,000 focal points, such as 6, 8, 10, 20, or 50 focal points. Each focal point may include, for example, a carbon nanotube field emission cathode, a gate electrode for extracting electrons, and a set of electron focusing lenses for focusing field-emitted electrons onto a small region or focal point on a target (e.g., an anode). It should be noted that the carbon nanotube field emission cathode is a cold cathode that can be instantaneously switched on and off. In this way, compared to conventional vacuum electrons based on thermionic cathodes, the use of carbon nanotube field emission cathodes can reduce the heating time and heat generation of the distributed X-ray source unit 22.

[0062] For example, the distributed X-ray source assembly 2 may also include a collimator. For instance, the collimator may be located in front of the distributed X-ray source unit to limit the direction and range of the X-ray beam emitted from the focal point of the distributed X-ray source unit, ensuring that the X-ray beam can be accurately projected onto the imaging object, thereby reducing interference from scattered X-rays and improving the clarity of the image.

[0063] Figure 4A and Figure 4B These are schematic diagrams of the detector structure according to some exemplary embodiments of the present disclosure.

[0064] Combined with reference Figure 1A , Figure 1B , Figure 2 , Figure 4A and Figure 4B The detector 3 is configured to record ray projection data, wherein the ray projection data is generated by ray radiation emitted by at least one focal point 220.

[0065] In some embodiments, detector 3 may include an X-ray detector and a data acquisition circuit, etc. The X-ray detector may be a solid-state detector, a gas detector, or other detectors, and the embodiments of this disclosure are not limited thereto. The data acquisition circuit includes a readout circuit, an acquisition trigger circuit, and a data transmission circuit, etc.

[0066] In the embodiments of this disclosure, detector 3 can be a single-row detector, a multi-row detector, or a surface detector. A suitable detector type can be selected for different application scenarios to optimize imaging efficiency and performance. For example, referring to... Figure 4A A single-row detector comprises multiple detection units arranged in a straight line; a multi-row detector comprises multiple rows of detector units, each row containing multiple detector units, forming a matrix or grid structure. For example, refer to... Figure 4B The surface detector covers a large planar area, and the detection units are densely arranged to form a continuous detection surface.

[0067] Figure 5 This is a schematic diagram of the structure of a tomographic imaging system according to some other exemplary embodiments of the present disclosure.

[0068] Combined with reference Figure 1A , Figure 1B , Figure 2 and Figure 5 The imaging device 4 can be mounted on the substrate 1 or disposed separately from the substrate 1, for example, Figure 1A and Figure 1B As shown, an imaging device 4 can be disposed inside the substrate 1; or, as Figure 5 As shown, the imaging device 4 can be disposed outside the substrate 1 and separately from the substrate 1.

[0069] Imaging device 4 is electrically connected to detector 3. Imaging device 4 is configured to process ray projection data using a tomographic synthesis reconstruction method to generate a radiation image.

[0070] For example, detector 3 can be used to acquire transmission data and / or multi-angle projection data of the imaging object. The data acquisition circuit in detector 3 may include a data amplification and shaping circuit, which can operate in (current) integration mode or pulse (counting) mode. The data from detector 3 can be connected to imaging device 4 via an output cable, and the acquired data is stored in imaging device 4 according to a trigger command.

[0071] In some embodiments, three-dimensional image reconstruction can be performed using the imaging device 4 when at least one focus 220 is activated and ray projection data has been recorded by the detector 3. For example, three-dimensional image reconstruction may include tomographic reconstruction. The imaging device 4 may include a computer program and / or a workstation. In three-dimensional image reconstruction, the computer program and / or workstation may be used to analyze, calibrate, reconstruct, and display three-dimensional tomographic images.

[0072] Combined with reference Figure 1A , Figure 1B , Figure 2 and Figure 5 The tomographic imaging system 100 may also include a control device 5, which may be disposed on the substrate 1 or separately from the substrate 1, for example, as shown in Figure 1A. Figure 1B As shown, a control device 5 may be installed inside the substrate 1; or, as Figure 5 As shown, the control device 5 can be located outside the base 1 and is separate from the base 1.

[0073] The control device 5 is electrically connected to the distributed radiation source assembly 2. The control device 5 is configured to control the radiation beam output of the multiple focal points 220 of the distributed radiation source unit 22 and to control the distributed radiation source assembly 2 to rotate around the rotation axis AX1.

[0074] Figure 6A , Figure 6B and Figure 6C The relative positions of the distributed radiation source assembly, the imaging object, and the detector according to some exemplary embodiments of the present disclosure are schematically shown respectively.

[0075] Combined with reference Figures 1A to 6C The rotation axis AX1 refers to the axis around which the distributed X-ray source assembly 2 rotates. Specifically, the rotation axis AX1 passes through the distributed X-ray source assembly 2 itself, allowing multiple focal points 220 to rotate around the rotation axis AX1.

[0076] It should be noted that the "rotation" here refers to the distributed X-ray source assembly 2, meaning that the rotation axis AX1, as an imaginary axis, runs through the physical structure of the distributed X-ray source assembly 2. Specifically, the rotation axis AX1 passes through the center of the X-ray source assembly 2, so that when the X-ray source assembly 2 rotates, it rotates around its own central axis.

[0077] Unlike the rotation axis of the slip ring structure in traditional CT (computed tomography) scans, where the entire gantry (including the X-ray source and detector) rotates continuously around a fixed axis (i.e., the X-ray source and detector are fixed on the same gantry and rotate as a whole around the rotation axis), in the embodiments of this disclosure, the rotation of the distributed X-ray source assembly 2 is a rotation about its own central axis, and the detector 3 does not rotate with the distributed X-ray source assembly 2.

[0078] In some embodiments, multiple focal points 220 on the distributed X-ray source assembly 2 are capable of moving in space along an arcuate or circular trajectory. "Arcuate or circular trajectory" means that as the distributed X-ray source assembly 2 rotates about the rotation axis AX1, the multiple focal points 220 move accordingly, tracing an arcuate or circular path. In some embodiments, the movement trajectory of the focal points 220 can be designed as needed. For example, the focal points 220 can move along a complete circular trajectory to perform an omnidirectional scan of the imaging object, or move only within a specific arc segment of the circumference to scan a specific area, such as focusing on detecting one side or a critical region of the imaging object.

[0079] Furthermore, the excitation of the focal spot 220 can be asynchronous with the rotation of the X-ray source assembly 2. That is, after the focal spot 220 moves to a predetermined position, the control device 5 can control its emission of X-rays. The rotation of the distributed X-ray source assembly 2, in conjunction with the control of the focal spot 220, enables X-ray irradiation of the imaging object from different spatial positions.

[0080] Referring to Figure 1A, Figure 1B and Figure 5 The radiation source mounting body 21 includes a fixed part 211 and a rotating part 212. The fixed part 211 is the stationary part of the radiation source mounting body 21 and provides support and stability for the movement of the rotating part 212. The rotating part 212 can rotate relative to the fixed part 211 around a rotation axis AX1, which extends through the rotating part 212. The rotating part 212 can drive the distributed radiation source assembly 2 to rotate around the rotation axis AX1, realizing radiation emission from multiple angles.

[0081] For example, such as Figure 3A As shown, the distributed X-ray source assembly 2 may include a distributed X-ray source unit 22, wherein a plurality of focal points 220 of the distributed X-ray source unit 22 are symmetrically distributed on the rotating part 212 with respect to the rotation axis AX1. For example, as... Figure 3B and Figure 3C As shown, the distributed X-ray source assembly 2 may include multiple distributed X-ray source units 22, which are symmetrically distributed on the rotating part 212 with respect to the rotation axis AX1.

[0082] In embodiments of this disclosure, the rotating part 212 may include a rotating disk 2120, the center of which coincides with the rotation axis AX1. The distributed radiation source unit 22 is mounted on the rotating disk 2120, which can rotate smoothly around the rotation axis AX1.

[0083] In embodiments of this disclosure, such as Figures 6A to 6C As shown, detector 3 and distributed X-ray source assembly 2 are arranged along the extension direction of rotation axis AX1. Specifically, detector 3 and distributed X-ray source assembly 2 are positioned opposite each other, forming a space between them for placing imaging object 10. Rotation axis AX1 passes through distributed X-ray source assembly 2 and extends along the center of detector 3, so that detector 3 and distributed X-ray source assembly 2 are axially aligned in space.

[0084] It should be noted that, as Figure 1A As shown, the imaging object 10 is schematically illustrated in the form of a human body. The imaging object 10 can be placed on a movable platform 90, for example, the imaging object 10 is lying on the movable platform 90. Figures 6A to 6C As shown, the imaging object 10 is schematically illustrated as a local region of interest or portion. It should be understood that... Figure 1A , Figures 6A to 6C The example of the imaging object 10 shown should not be construed as a limitation on the imaging object 10.

[0085] Multiple focal points 220 on the distributed X-ray source assembly 2 are distributed around the rotation axis AX1. As the distributed X-ray source assembly 2 rotates around the rotation axis AX1, the focal points 220 move along an arc or circular trajectory in space. The detector 3 is positioned in the direction extending from the rotation axis AX1, corresponding to the position of the distributed X-ray source assembly 2. In this way, X-rays from the focal points 220 can pass through the imaging object 10 along the direction of the rotation axis AX1 and be received by the detector 3.

[0086] During installation and assembly, the distributed X-ray source assembly 2 and detector 3 can be arranged along the extension direction of the rotation axis AX1 in various ways to adapt to different imaging needs and scenarios. For example, detector 3 can be connected to the distributed X-ray source assembly 2 via connecting arm 32 to form a rigid, integrated structure, ensuring that the relative positions of the two are fixed. Alternatively, detector 3 can be separated from the distributed X-ray source assembly 2, allowing for adjustments to the detector's position to expand the imaging field of view or optimize the X-ray path when special imaging angles are required or the imaging object is large.

[0087] In certain specific applications, at least a portion of detector 3 can be located inside the object being imaged. For example, when detailed observation of the internal structure of the object is required, a portion of the detector can be embedded inside the object, working in conjunction with an external X-ray source to provide higher resolution and a more comprehensive field of view.

[0088] In embodiments of this disclosure, the tomographic imaging system 100 further includes an operation unit 6, which provides an interactive interface for the user to select the system's scanning mode and control other operating parameters. For example, the operation unit is configured for user operation to select a scanning mode. Specifically, the scanning mode may include a first scanning mode, a second scanning mode, and / or a third scanning mode, each corresponding to different imaging parameters and workflow.

[0089] The operation unit 6 can be implemented as physical control buttons and a user interface on a display screen, or a combination of both. The physical control buttons can be designed as knobs, buttons, or switches, each corresponding to a specific function, such as starting a scan, switching modes, or adjusting imaging parameters. Furthermore, the physical control buttons can be equipped with physical feedback, such as a slight press or rotational damping. The user interface is displayed on the integrated system screen, providing users with a graphical interaction method. The user interface can be designed as a touchscreen, allowing mode selection and parameter settings to be completed through touch or swipe operations.

[0090] In embodiments of this disclosure, the tomographic imaging system 100 includes a first side 101 and a second side 102 opposite to each other. The tomographic imaging system 100 also includes a degree-of-freedom device 7 for flexibly adjusting the position and angle of the distributed X-ray source assembly 2 to precisely align with the imaging object. The connection between the degree-of-freedom device 7 and the substrate 1 is located on the first side 101. The degree-of-freedom device 7 includes a first end 71 and a second end 72.

[0091] Specifically, the first end 71 is connected to the base 1. The base 1 serves as the support platform for the entire imaging system, and the degree-of-freedom device 7 is securely fixed to the base 1 via the first end, ensuring stability and accuracy during operation; the second end 72 is connected to the distributed X-ray source assembly 2. Through the connection of the second end 72, the degree-of-freedom device 7 can fix the distributed X-ray source assembly 2 in the desired specific position, while allowing it to rotate and adjust in multiple directions to achieve alignment of the imaging object.

[0092] In some embodiments, the degree-of-freedom device 7 includes a first arm 710 and a second arm 720. The first end 711 of the first arm 710 is connected to the base, the second end 712 of the first arm 710 is hinged to the first end 721 of the second arm 720, and the second end 722 of the second arm 720 is connected to the fixing part 211. This dual-arm structure allows the degree-of-freedom device 7 to provide rotational degrees of freedom on different independent axes. For example, the first arm 710 can rotate about the hinged position of the base 1, changing the overall position of the distributed radiation source assembly 2; while the second arm 720 can rotate about its hinged position, further adjusting the angle of the distributed radiation source assembly 2.

[0093] For example, in conjunction with reference Figure 1A and Figure 1B The degree-of-freedom device 7 can be operated to be in an extended state (e.g. Figure 1A (as shown) and non-expanded state (as shown) Figure 1B (As shown). For example, the first arm 710 may pivot relative to the substrate 1, and / or the second arm 720 may pivot relative to the first arm 710, so that the tomographic imaging system can be in an deployed state (as shown). Figure 1A (as shown) and non-expanded state (as shown) Figure 1B Switch between (as shown).

[0094] Furthermore, the degree-of-freedom device 7 defines at least two independent rotation axes, enabling the distributed X-ray source assembly 2 not only to rotate in different directions but also to adjust its orientation and position in a multi-degree-of-freedom space, thereby aligning the distributed X-ray source assembly 2 relative to the imaging object. For example, when the geometric center of the imaging object changes or a specific X-ray irradiation angle is required, the distributed X-ray source assembly 2 can be quickly and precisely adjusted by the rotation and tilting of the rotation axes through the degree-of-freedom device 7.

[0095] In embodiments of this disclosure, when the control device 5 is located inside the base 1, its connection to the distributed radiation source assembly 2 can be achieved through a built-in cable system. The cable system can pass through the interior of the first arm 710 and the second arm 720 and be electrically connected to the distributed radiation source assembly 2. The cable is designed with an embedded arrangement, which protects the cable from external environmental influences such as dust, moisture, and physical damage, while also making the system appearance more streamlined and preventing exposed cables from interfering with or tangling during the movement of the degree-of-freedom device.

[0096] In embodiments of this disclosure, the tomographic imaging system 100 further includes a movable mechanism 8, on which the substrate 1 is disposed. The movable mechanism 8 is configured to drive the substrate 1 to move, thereby adjusting the position and angle of the tomographic imaging system 100 to adapt to the needs of different imaging objects. For example, the movable mechanism may be a guide rail, a wheeled support, or a robotic platform, providing linear movement or multi-degree-of-freedom motion.

[0097] Referring to Figure 1A, Figure 1B and Figure 5 The movable mechanism 8 may include multiple moving wheels, such as multiple drive wheels 81 and steering wheels 82. The diameter of at least one drive wheel 81 located on the second side may be larger than the diameter of at least one steering wheel 82 located on the first side.

[0098] For example, drive wheels 81 can be used to provide power, facilitating the movement of the base 1 on the ground. The number and position of drive wheels 81 can be designed according to actual needs, as shown in Figure 1A. Figure 1B and Figure 5 As shown, it can be positioned on both sides of the rear of the movable mechanism 8 to provide sufficient driving force.

[0099] The steering wheel 82 can be used to provide directional control, enabling the movable mechanism 8 to turn and adjust its position flexibly. By adjusting the angle of the steering wheel 82, the substrate 1 can be steered, facilitating the flexible movement of the tomographic imaging system 100 in different environments. (See Figure 1A.) Figure 1B and Figure 5 As shown, the steering wheels 82 can be located on both sides of the front of the movable mechanism 8, for example, they can be designed as omnidirectional wheels.

[0100] In some embodiments, the tomographic imaging system 100 may further include a handle 9. The handle 9 is configured for operation by a user of the system so that the user can move the tomographic imaging system 100. The handle 9 is located on the second side 102 so that the user can maintain a natural posture during operation. The handle 9 may be in the form of a straight rod, a crank, or a grip conforming to the shape of the human hand.

[0101] Combined with reference Figures 1A to 6C The tomographic imaging system 100 can be configured to perform tomographic imaging in a first scanning mode under the control of the control device 5.

[0102] Specifically, in the first scanning mode, at least two focal points 220 in the distributed ray source assembly 2 emit rays sequentially to acquire projection data of the imaging object 10 from multiple angles of a certain cross-section.

[0103] According to embodiments of this disclosure, for example, such as Figure 6AAs shown, before the distributed ray source assembly 2 rotates, at least two focal points 220 in the distributed ray source assembly 2 emit rays sequentially, which can collect the first ray projection data from the initial angular position.

[0104] Control device 5 is configured to precisely control the excitation sequence and time interval of focus 220, ensuring that the emission of rays proceeds according to a predetermined program. The excitation sequence of focus 220 can be optimized according to the geometry of the imaging object and scanning requirements to obtain more uniform and high-quality ray projection data. Detector 3 operates synchronously during this process, recording the first ray projection data.

[0105] After completing the excitation of a set of focal points 220, for example, as Figure 6B As shown, multiple focal points 220 can be rotated around the rotation axis AX1 by a predetermined angle. The specific rotation angle can be set by the control device 5 according to the imaging requirements. For example, it can be set to a fixed small angle increment, such as 1 degree or 2 degrees; it can also be designed as a variable angle within a certain range. After the distributed X-ray source assembly 2 rotates to a new position, the control device 5 controls the focal points 220 to emit X-rays sequentially again, and the detector 3 synchronously records the new X-ray projection data.

[0106] According to embodiments of this disclosure, in order to optimize imaging efficiency, the rotation angle can be flexibly adjusted based on the characteristics of the imaging object and the imaging target. For example, when the goal is to acquire high-resolution detail information, the rotation angle can be reduced to increase the density of the projected data; while in scenarios where the overall shape is of interest or the scanning speed is accelerated, the rotation angle can be appropriately increased to reduce the number of excitations.

[0107] According to an embodiment of this disclosure, the control device 5 can control the rotating disk 2120 to rotate at a set speed and angle by providing corresponding drive commands to the rotating disk 2120, thereby driving the focal point 220 in the distributed X-ray source assembly 2 to rotate around the rotation axis AX1.

[0108] Through rotational operations at multiple angles, the distributed ray source component 2 can provide continuous ray projection information for different sides of the imaging object. The ray projection data recorded after each rotation is defined as the second ray projection data, which, together with the first ray projection data acquired at the initial angle position, constitutes a complete dataset. The acquisition of the second ray projection data significantly increases the coverage of the imaging object in three-dimensional space, making the ray paths formed by each focal point 220 passing through the imaging object from different angles richer. This multi-angle data coverage reduces the unprojected areas of the imaging object, significantly reducing the probability of artifacts caused by insufficient data, thereby improving the overall clarity of the reconstructed image.

[0109] In embodiments of this disclosure, the imaging device 4 processes first and second ray projection data using a tomographic synthesis and reconstruction method. Specifically, the imaging device 4 may include a data processing module and a storage module for storing and processing the acquired ray projection data. By calculating ray projection data from different angles, the imaging device 4 can generate tomographic images.

[0110] In some embodiments, to improve imaging efficiency and image quality, the control device 5 can also dynamically adjust parameters during the scanning process. For example, based on real-time feedback from the detector 3, the control device 5 can adjust the excitation time interval of the focal spot or the rotation speed of the X-ray source assembly to address density variations in the imaging object or non-uniformity of the projection data.

[0111] Combined with reference Figures 1A to 6C The tomographic imaging system 100 can also be configured to perform tomographic imaging under the control of the control device 5 by using a scanning mode that switches between a first scanning mode and a second scanning mode or between a first scanning mode and a third scanning mode.

[0112] In the embodiments of this disclosure, unlike the first scanning mode in which the distributed X-ray source component 2 rotates continuously via the rotation axis AX1, in the second scanning mode, the distributed X-ray source component 2 can remain stationary. This static approach, combined with the multi-focal design of the distributed X-ray source component 2, allows multiple focal points to emit X-rays sequentially, covering multiple projection angles of the imaging object in a short time.

[0113] The second scanning mode utilizes the arrangement of distributed X-ray source components, with each focal point emitting rays at a specific angle. This allows the rays to pass through the imaging object from multiple perspectives without requiring significant rotation of the X-ray source components. Due to the limited range of motion of the X-ray source components, the acquisition speed of projection data is significantly improved. Detector 3, with its high-precision, multi-channel acquisition capabilities, records the third-ray projection data in real time. This data is processed directly by the imaging device, without waiting for the complete rotation operation. The imaging device employs a tomographic synthesis and reconstruction method to rapidly calculate and analyze the third-ray projection data, thereby generating a three-dimensional tomographic image.

[0114] In embodiments of this disclosure, the third scanning mode can utilize one focal point of the distributed X-ray source assembly 2 to emit X-rays, a detector records fourth X-ray projection data, and an imaging device generates a two-dimensional digital X-ray image. Therefore, the third scanning mode does not involve rotation or multifocal excitation operations; its goal is to rapidly generate a two-dimensional image from a specific viewpoint.

[0115] According to embodiments of this disclosure, by flexibly switching between a first scanning mode, a second scanning mode, and a third scanning mode, the tomographic imaging system can adapt to a variety of needs, from global three-dimensional imaging to local high-resolution scanning, as well as rapid two-dimensional image generation.

[0116] For example, in tumor detection, doctors can first use the first scanning mode to perform a comprehensive 3D imaging of the target area on the patient, obtaining information on the overall location, shape, and size of the tumor. If an abnormal area is found, they can switch to the second or third scanning mode to perform a static, high-resolution local scan of that area to more accurately assess the tumor's boundaries and tissue details. For example, when inspecting large mechanical components (such as turbine blades or large pipes), the third scanning mode can be used for DR imaging to identify potential problem areas; subsequently, the system can switch to the first scanning mode to perform a local scan of the problem area to detect the depth of cracks or weld quality. For example, on a production line, the third scanning mode can be used to quickly generate 2D images for quality checks on the appearance or surface of each product. If an anomaly is detected, the system can switch to the first scanning mode for a more in-depth 3D inspection of the internal structure, thereby ensuring product quality.

[0117] In embodiments of this disclosure, the tomographic imaging system 100 can flexibly switch scanning modes via the operation unit 6. When the user selects a new scanning mode via the operation unit 6, the control device 5 automatically adjusts the system's operating state, including the focal excitation sequence, rotation or static configuration of the distributed X-ray source assembly 2, and the data acquisition method of the detector 3. The entire switching process is completed automatically in the background without requiring additional manual adjustments from the user. For example, when switching from the first scanning mode to the third scanning mode, the control device 5 will stop the multi-focal excitation operation and enable single-focal X-ray emission, while updating the detector's acquisition strategy to generate a two-dimensional X-ray image.

[0118] Combined with reference Figures 1A to 6C The tomographic imaging system 100 can also be configured to perform tomographic imaging under the control of the control device 5 by switching between a first scanning mode, a second scanning mode, and a third scanning mode to meet the complex requirements of different imaging scenarios.

[0119] For example, in pipeline leak detection, the second scanning mode can perform high-resolution scanning of suspected leak areas, while switching to the third scanning mode can quickly generate two-dimensional images for real-time monitoring of the overall pipeline condition. Similarly, in biological research, the third scanning mode can quickly generate two-dimensional images for initial localization of regions of interest in cells or tissues. Switching to the second scanning mode then allows for static local scanning of these areas, acquiring higher-resolution three-dimensional details for observing cell structure or tissue characteristics.

[0120] Combined with reference Figures 1A to 6C The tomographic imaging system 100 can also be configured to perform tomographic imaging under the control of the control device 5 by switching between a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode.

[0121] In embodiments of this disclosure, in the fourth scanning mode, at least two focal points in the distributed X-ray source assembly 2 sequentially emit X-rays, and the detector 3 records the first X-ray projection data. That is, similar to the first scanning mode, before the position of the distributed X-ray source assembly 2 changes, at least two focal points 220 in the distributed X-ray source assembly 2 can sequentially emit X-rays to acquire the first X-ray projection data from the initial position.

[0122] Furthermore, the degree-of-freedom device 7 can drive the distributed ray source assembly 2 to a predetermined position. Specifically, the degree-of-freedom device 7 can drive the distributed ray source assembly 2 to perform precise translation and / or rotation, thereby ensuring that the rays can be projected from multiple different perspectives to obtain more projection data.

[0123] It should be noted that, unlike the first scanning mode, in the fourth scanning mode, the distributed X-ray source assembly 2 does not rotate around the rotation axis AX1 via the rotary disk 2120. Instead, the spatial position of the distributed X-ray source assembly 2 is changed through the first arm 710 and / or the second arm 720 of the degree-of-freedom device 7. The predetermined position can be obtained by pre-setting the movement mode and trajectory of the first arm 710 and / or the second arm 720 according to imaging requirements and application scenarios, or it can be obtained by the user through the operation unit 6 in real time during use.

[0124] Once the distributed X-ray source assembly 2 reaches the predetermined position, the control device 5 can again instruct at least two focal points in the distributed X-ray source assembly 2 to emit X-rays sequentially, and the detector 3 records the new X-ray projection data. At this time, due to the change in the position of the X-ray source, the projection data collected by the detector is projection data from a new perspective, thus providing richer data support for tomographic image reconstruction.

[0125] According to embodiments of the present invention, when the object being imaged has a complex shape or requires comprehensive analysis from different perspectives, the fourth scanning mode can be switched. For example, for complex engine parts, turbine blades, aerospace components, etc., which typically have complex structures and contain multiple different gaps, holes, and layers, switching to the fourth scanning mode allows the distributed X-ray source assembly to be adjusted multiple times using a degree-of-freedom device to acquire projection data from different spatial positions and angles, thereby generating a complete three-dimensional image for analyzing internal defects or micro-cracks in the component.

[0126] In some exemplary embodiments, the tomographic imaging system 100 may further include a calibration device 11 for calibrating the relative positional relationship between the various focal points 220 of the distributed radiation source assembly 2 and the detector 3.

[0127] Figure 7A , Figure 7B , Figure 7C and Figure 7D These are schematic diagrams illustrating the structure of a calibration apparatus for the tomographic imaging system according to exemplary embodiments of the present disclosure. Figures 7A-7C This is a side view. Figure 7D This is a floor plan.

[0128] The calibration device 11 may include a calibration device body 111 and a marking part 112. The marking part 112 may be provided on the calibration device body 111.

[0129] According to some optional embodiments of this disclosure, the detector 3 and the calibration device 11 are located on the same side of the imaging object, and the calibration device 11 and the detector 3 are attached together.

[0130] According to some embodiments of this disclosure, the calibration device 11 can be disposed between the detector 3 and the distributed radiation source assembly 2, and the relative positions of the calibration device 11 and the detector 3 are fixed.

[0131] According to some embodiments of this disclosure, the calibration device 11 includes a region of interest (ROI) and a non-ROI region disposed outside the ROI. The image of the imaging object after exposure is located within the ROI. The calibration device 11 is provided with a plurality of markers 112 having three-dimensional geometric shapes. The images of the markers 112 after exposure are located within the calibration device 11 for coordinate calibration of the X-ray imaging. Coordinate calibration includes calculating the relative positional relationship between the detector 3 and the distributed X-ray source assembly 2 using the shapes of the markers 112 and their imaging shapes. Furthermore, since the positional relationships of the individual focal points 220 in the distributed X-ray source assembly 2 are predetermined, the positional relationships between the detector 3 and each focal point 220 can be determined based on the relative positional relationship between the detector 3 and the distributed X-ray source assembly 2, and the positional relationships of the individual focal points 220 in the distributed X-ray source assembly 2.

[0132] According to some embodiments of this disclosure, the coordinate calibration and X-ray imaging use the same set of data.

[0133] According to some embodiments of this disclosure, each marking part 112 includes a marking symbol or marking graphic, and different marking symbols or marking graphics have a predetermined relative positional relationship.

[0134] It should be noted that, in this embodiment, the marking symbols can be English letters, Greek letters, Arabic numerals, etc., and the marking graphics can be circles, squares, triangles, etc.

[0135] According to some embodiments of this disclosure, at least one marker 112 is located in a region of non-interest after exposure of the image, so as to perform coordinate calibration for ray imaging.

[0136] According to some embodiments of this disclosure, at least one marker 112 is located in the region of interest after exposure of the image to perform coordinate calibration of the ray imaging.

[0137] It should be noted that, in this embodiment, when the exposed image of the marker 112 is located in the region of interest, the marker 112 will overlap with the exposed image of the imaging object, and the marker 112 needs to be removed from the exposed image of the imaging object. This can be achieved by extracting the marker 112 from the exposed image of the imaging object and performing interpolation.

[0138] According to some embodiments of this disclosure, the relative positional relationship between the detector 3 and the distributed radiation source assembly 2 includes the flip angle and offset angle of the detector 3 relative to the distributed radiation source assembly 2, as well as the distance between the detector 3 and the distributed radiation source assembly 2.

[0139] In this embodiment, the known parameters on the marker 112 are used to correct the relative coordinates of the source and detector. The shape of the marker 112 and its imaging coordinates are used to calculate the spatial coordinates of the distributed X-ray source assembly 2 and the detector 3 to obtain the relative positional relationship between the distributed X-ray source assembly 2 and the detector 3, and to correct the imaging of the detector 3. The system's mechanical positioning advantage is used to assist in calculating the relative coordinates of the source and detector, reducing the amount of calculation required for coordinate estimation, improving the accuracy of the relative position or achieving real-time position calibration, and avoiding secondary imaging.

[0140] According to some optional embodiments of this disclosure, the marking part 112, the calibration device 11, and the detector 3 may be tightly bound together and cannot be disassembled. The calibration device 11 and the detector 3 are fixedly connected, for example, they are glued together, and the marking part 112 is fixedly disposed on the calibration device 11.

[0141] According to some embodiments of this disclosure, the marking part 112 is used to correct geometric errors caused by the disassembly and movement of the detector 3.

[0142] According to some optional embodiments of this disclosure, the marking part 112 is disposed on the top side of the calibration device 11 away from the detector 3. The thickness of the calibration device 11 is a known parameter, that is, the distance between the marking part 112 and the detector 3 is a known parameter, and due to the fixed connection between the calibration device 11 and the detector 3, the distance between the marking part 112 and the detector 3 remains constant.

[0143] According to some alternative embodiments of this disclosure, the calibration device 11 is detachably mounted on the detector 3. That is, one set of marking parts 112 and calibration device 11 can correspond to one detector 3, or one set of marking parts 112 and calibration device 11 can be detached from one detector module and installed on different detectors 3 to form a new detector module, improving applicability and facilitating subsequent cleaning and sterilization. According to some optional embodiments of this disclosure, the above-described calibration device is suitable for medical imaging systems. Further optionally, the above-described calibration device is suitable for dental imaging systems.

[0144] According to some alternative embodiments of this disclosure, the number of the marking portions 112 is less than or equal to four.

[0145] According to some optional embodiments of this disclosure, such as Figure 7B As shown, the calibration device may also include a bracket 113, one end of which is connected to the detector 3 and the other end is connected to the calibration device body 111. The detector 3 and the calibration device body 111 are located on both sides of a portion of the imaging object. The bracket 113 is a rigid structure to keep the relative positions of the detector 3 and the marker 112 unchanged.

[0146] According to some embodiments of this disclosure, such as Figure 7C As shown, the calibration device 11 can be bound to the distributed X-ray source assembly 2, and the size and position of the marker 112 can be adjusted according to the source-detector relationship so that it is located in the region of non-interest in the exposed image.

[0147] Figure 8 This is a flowchart of a tomographic imaging method according to some exemplary embodiments of the present disclosure.

[0148] Reference Figure 8 As shown, the tomographic imaging method 200 includes operations S210 to S260.

[0149] In operation S210, at least two focal points in the distributed radiation source assembly are controlled to emit radiation sequentially.

[0150] In operation S220, in response to the emission of the ray, the detector records the first ray projection data.

[0151] In operation S230, the plurality of focal points are controlled to rotate around a rotation axis by a predetermined angle, wherein the rotation axis passes through the distributed ray source assembly itself.

[0152] In the embodiments of this disclosure, after the initial projection data acquisition is completed, multiple focal points can be further controlled to rotate around a rotation axis by a predetermined angle. The rotation axis runs through the distributed X-ray source assembly itself, enabling the focal points to scan the imaging object from different perspectives. The rotation angle is flexibly adjustable, and can be a fixed small incremental angle or adjusted to an angle within a dynamic range under specific needs to ensure the coverage and uniformity of the projection data.

[0153] In operation S240, after rotating a predetermined angle, at least two focal points in the distributed ray source assembly are controlled to emit rays again in sequence.

[0154] In embodiments of this disclosure, when the distributed ray source assembly rotates to a new position, the system can again control at least two focal points in the distributed ray source assembly to emit rays sequentially, forming a new set of projection paths.

[0155] In operation S250, in response to the re-emission of the ray, the detector records the second ray projection data.

[0156] In embodiments of this disclosure, in response to the Nth focal emission, the detector can record second ray projection data to form complete multi-angle projection information together with the first ray projection data, providing multi-view support for image reconstruction. N is a positive integer greater than 1.

[0157] In operation S260, the first ray projection data and the second ray projection data are processed using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0158] According to embodiments of this disclosure, the tomographic imaging method 200 utilizes a distributed X-ray source assembly with multiple focal points, enabling at least two focal points to emit X-rays simultaneously, and the rotation of the focal points can cover different viewing angles of the imaging object, thereby significantly improving the coverage of the projection data. This multi-focal emission method reduces the viewing angle blind spots caused by a single focal point, thus effectively reducing the impact of finite angle artifacts.

[0159] Figure 9 This is a flowchart of an imaging method according to some exemplary embodiments of the present disclosure.

[0160] Reference Figure 9 As shown, imaging method 300 includes operation S310.

[0161] In operation S310, in response to the user's operation, at least one of the first scanning mode, the second scanning mode, the third scanning mode, and the fourth scanning mode is used to perform radiation imaging on the imaging object.

[0162] In the first scanning mode, at least two focal points in the distributed X-ray source assembly are controlled to emit X-rays sequentially; in response to the emission of the X-rays, a detector records first X-ray projection data; the plurality of focal points are controlled to rotate around a rotation axis by a predetermined angle, wherein the rotation axis passes through the distributed X-ray source assembly itself; after rotating by the predetermined angle, at least two focal points in the distributed X-ray source assembly are controlled to emit X-rays again sequentially; in response to the re-emission of the X-rays, the detector records second X-ray projection data; and the first X-ray projection data and the second X-ray projection data are processed using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0163] In the second scanning mode, at least two focal points in the distributed X-ray source assembly are controlled to emit X-rays sequentially; in response to the emission of the X-rays, a detector records third X-ray projection data; and the third X-ray projection data is processed using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0164] In the third scanning mode, a focal point in the distributed radiation source assembly is controlled to emit radiation; in response to the emission of the radiation, the detector records fourth radiation projection data and processes the fourth radiation projection data to generate a digital radiation image.

[0165] In the fourth scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records the first X-ray projection data; after the distributed X-ray source assembly is driven to a predetermined position using the degree-of-freedom device, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records the fifth X-ray projection data; the imaging device processes the first X-ray projection data and the fifth X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

[0166] According to embodiments of this disclosure, the first scanning mode uses a combination of multiple focal points and rotation angles to acquire rich projection data, suitable for tomographic imaging tasks requiring high resolution and comprehensive data coverage; the second scanning mode allows the focal points to emit rays sequentially and acquire data rapidly, suitable for scenarios requiring rapid acquisition of tomographic images, especially for relatively simple or large-scale imaging objects; the third scanning mode generates high-quality two-dimensional digital X-ray images through the emission of a single focal point, suitable for applications requiring rapid examination or preliminary diagnosis, such as rapid imaging from a specific viewpoint; the fourth scanning mode realizes the spatial position change of the distributed X-ray source components through the first and / or second arms of the degree-of-freedom device, suitable for tasks where the imaging object has a complex shape or requires comprehensive analysis from different viewpoints.

[0167] Therefore, imaging method 300 optimizes the tomographic imaging process and improves image quality by switching between different scanning modes to respond to user needs and the characteristics of the imaging object. Different scanning modes allow for data acquisition at different levels and angles on the same imaging object, thereby providing richer and more comprehensive image information.

[0168] The embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. It should be noted that implementations not illustrated or described in the drawings or the main text of the specification are forms known to those skilled in the art and have not been described in detail. Furthermore, the definitions of the various components described above are not limited to the specific structures, shapes, or methods mentioned in the embodiments, and those skilled in the art can easily modify or substitute them.

[0169] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A tomographic imaging system based on a distributed X-ray source assembly, characterized in that, include: Matrix; A distributed radiation source assembly is disposed on the substrate. The distributed radiation source assembly includes a radiation source mounting body and a distributed radiation source unit disposed on the radiation source mounting body. The distributed radiation source unit includes multiple focal points, which are configured to emit radiation separately. A detector configured to record ray projection data, wherein the ray projection data is generated by ray radiation emitted from at least one of the focal points; and An imaging device, disposed on or separately from the substrate, electrically connected to the detector, is configured to process the X-ray projection data using a tomographic synthesis and reconstruction method to generate a radiation image. At least a portion of the distributed radiation source assembly is rotatable about a rotation axis, such that the plurality of focal points are rotatable about the rotation axis, which passes through the distributed radiation source assembly itself.

2. The system according to claim 1, characterized in that, The detector and the distributed radiation source assembly are arranged along the extension direction of the rotation axis.

3. The system according to claim 1 or 2, characterized in that, The tomographic imaging system further includes a control device, which is disposed on or separately from the substrate. The control device is electrically connected to the distributed X-ray source assembly and is configured to control the X-ray beam output from multiple focal points of the distributed X-ray source unit and to control the distributed X-ray source assembly to rotate around the rotation axis.

4. The system according to claim 3, characterized in that, The tomographic imaging system is configured to perform tomographic imaging in a first scanning mode under the control of the control device. In the first scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records first X-ray projection data; after the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records second X-ray projection data; the imaging device processes the first X-ray projection data and the second X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

5. The system according to claim 3, characterized in that, The tomographic imaging system is configured to switch between a first scanning mode and a second scanning mode or a third scanning mode under the control of the control device. In the first scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records first X-ray projection data; after the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records second X-ray projection data; the imaging device processes the first X-ray projection data and the second X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; In the second scanning mode, at least two focal points in the distributed radiation source assembly emit radiation sequentially, the detector records third radiation projection data, and the imaging device processes the third radiation projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; or, in the third scanning mode, one focal point in the distributed radiation source assembly emits radiation, the detector records fourth radiation projection data, and the imaging device processes the fourth radiation projection data to generate a digital radiation image.

6. The system according to claim 3, characterized in that, The tomographic imaging system is configured to switch between a first scanning mode, a second scanning mode, and a third scanning mode under the control of the control device. In the first scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records first X-ray projection data; after the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records second X-ray projection data; the imaging device processes the first X-ray projection data and the second X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; In the second scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, the detector records third X-ray projection data, and the imaging device processes the third X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; In the third scanning mode, a focal point of the distributed radiation source assembly emits radiation, the detector records fourth radiation projection data, and the imaging device processes the fourth radiation projection data to generate a digital radiation image.

7. The system according to any one of claims 1, 2, and 4-6, characterized in that, The radiation source mounting body includes a fixed part and a rotating part. The rotating part is capable of rotating about the rotation axis relative to the fixed part, and the rotation axis extends through the rotating part.

8. The system according to claim 7, characterized in that, The distributed radiation source assembly includes one distributed radiation source unit, wherein multiple focal points of the distributed radiation source unit are symmetrically distributed on the rotating part with respect to the rotation axis; or, The distributed radiation source assembly includes a plurality of distributed radiation source units, which are symmetrically distributed on the rotating part with respect to the rotation axis.

9. The system according to claim 7, characterized in that, The rotating part includes a rotating disk.

10. The system according to any one of claims 1, 2, 4-6, and 8-9, characterized in that, The tomographic imaging system further includes a movable mechanism, on which the substrate is disposed, and the movable mechanism is configured to drive the substrate to move.

11. The system according to any one of claims 1, 2, 4-6, and 8-9, characterized in that, The tomographic imaging system also includes a degree-of-freedom device, which has a first end and a second end opposite to each other. The first end of the degree-of-freedom device is connected to the substrate, and the second end of the degree-of-freedom device is connected to the distributed X-ray source assembly.

12. The system according to claim 11, characterized in that, The distributed X-ray source assembly is rotatable about at least two independent axes defined by the degree of freedom device to align the distributed X-ray source assembly relative to the imaging object.

13. The system according to claim 11, characterized in that, The degree-of-freedom device includes a first arm and a second arm. The first end of the first arm is connected to the base, the second end of the first arm is hinged to the first end of the second arm, and the second end of the second arm is connected to the fixing part.

14. The system according to claim 13, characterized in that, The tomographic imaging system is configured to switch between four scanning modes—a first scanning mode, a second scanning mode, a third scanning mode, and a fourth scanning mode—under the control of the control device. In the first scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records first X-ray projection data; after the plurality of focal points rotate around the rotation axis by a predetermined angle, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records second X-ray projection data; the imaging device processes the first X-ray projection data and the second X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; In the second scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, the detector records third X-ray projection data, and the imaging device processes the third X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image; In the third scanning mode, a focal point of the distributed radiation source assembly emits radiation, the detector records fourth radiation projection data, and the imaging device processes the fourth radiation projection data to generate a digital radiation image; In the fourth scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records the first X-ray projection data; after the distributed X-ray source assembly is driven to a predetermined position using the degree-of-freedom device, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records the fifth X-ray projection data; the imaging device processes the first X-ray projection data and the fifth X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

15. The system according to any one of claims 1, 2, 4-6, 8-9, and 12-14, characterized in that, The detector is connected to the distributed radiation source assembly via a connecting arm, or the detector is separately disposed from the distributed radiation source assembly; and / or, The detector and the distributed X-ray source assembly are located on opposite sides of the imaging object along the extension direction of the rotation axis, or at least a portion of the detector is located within the imaging object.

16. The system according to any one of claims 1, 2, 4-6, 8-9, and 12-14, characterized in that, The tomographic imaging system also includes a calibration device for calibrating the relative positional relationship between the focal points of the distributed X-ray source assembly and the detector.

17. The system according to claim 13, characterized in that, The control device is disposed inside the substrate and is electrically connected to the distributed radiation source assembly via cables passing through the interior of the first and second arms.

18. The system according to any one of claims 1, 2, 4-6, 8-9, and 12-14, characterized in that, The tomographic imaging system also includes an operation unit configured to be operated by a user of the system so that the user can select a scanning mode.

19. The system according to claim 18, characterized in that, The operating unit includes physical operating buttons; and / or, the operating unit includes a user interface displayed on a display screen.

20. The system according to claim 18, characterized in that, The tomographic imaging system further includes a push handle configured to be operated by a user of the system so that the user can move the tomographic imaging system; and The tomographic imaging system includes a first side and a second side opposite to each other, with the connection between the degree-of-freedom device and the substrate located on the first side and the pusher located on the second side.

21. The system according to claim 10, characterized in that, The movable mechanism includes a plurality of movable wheels, wherein the diameter of at least one movable wheel located on the second side is greater than the diameter of at least one movable wheel located on the first side.

22. A tomographic imaging system based on a distributed X-ray source assembly, characterized in that, include: Matrix; A distributed radiation source assembly is disposed on the substrate. The distributed radiation source assembly includes a radiation source mounting body and a distributed radiation source unit disposed on the radiation source mounting body. The distributed radiation source unit includes multiple focal points, which are configured to emit radiation separately. as well as An imaging apparatus, disposed on or separately from the substrate, is configured to process ray projection data using a tomographic synthesis and reconstruction method to generate a radiation image, wherein the ray projection data is generated by detecting rays emitted from at least one of the focal points and transmitted through the imaged object. The radiation source mounting body includes a fixed part and a rotating part. The rotating part is capable of rotating relative to the fixed part about a rotation axis extending through the rotating part itself, so that the plurality of focal points can rotate about the rotation axis.

23. The system according to claim 22, characterized in that, The tomographic imaging system further includes a detector configured to record the ray projection data; and The distributed X-ray source assembly, at least a portion of the imaging object, and the detector are arranged along the extension direction of the rotation axis.

24. A tomographic imaging method based on a distributed X-ray source assembly, characterized in that, The distributed X-ray source assembly includes multiple focal points, and the tomographic imaging method includes: Control at least two focal points in a distributed radiation source assembly to emit radiation sequentially; In response to the emission of the ray, the detector records the first ray projection data; The plurality of focal points are controlled to rotate around a rotation axis by a predetermined angle, wherein the rotation axis passes through the distributed ray source assembly itself; After rotating by a predetermined angle, at least two focal points in the distributed ray source assembly are controlled to emit rays again in sequence; In response to the re-emission of the ray, the detector records second ray projection data; and The first ray projection data and the second ray projection data are processed using a tomographic synthesis and reconstruction method to generate a tomographic image.

25. An imaging method based on a distributed X-ray source assembly, characterized in that, The distributed X-ray source assembly includes multiple focal points, and the imaging method includes: In response to user input, the system performs radiometric imaging of the object using at least one of the following scan modes: a first scan mode, a second scan mode, a third scan mode, and a fourth scan mode. In the first scanning mode, at least two focal points in the distributed X-ray source assembly are controlled to emit X-rays sequentially; in response to the emission of the X-rays, a detector records first X-ray projection data; the plurality of focal points are controlled to rotate around a rotation axis by a predetermined angle, wherein the rotation axis passes through the distributed X-ray source assembly itself; after rotating by the predetermined angle, at least two focal points in the distributed X-ray source assembly are controlled to emit X-rays again sequentially; in response to the re-emission of the X-rays, the detector records second X-ray projection data; and the first X-ray projection data and the second X-ray projection data are processed using a tomographic synthesis and reconstruction method to generate a tomographic image. In the second scanning mode, at least two focal points in the distributed X-ray source assembly are controlled to emit X-rays sequentially; in response to the emission of the X-rays, a detector records third X-ray projection data; and the third X-ray projection data is processed using a tomographic synthesis and reconstruction method to generate a tomographic image. In the third scanning mode, a focal point in the distributed radiation source assembly is controlled to emit radiation; in response to the emission of the radiation, the detector records fourth radiation projection data and processes the fourth radiation projection data to generate a digital radiation image; In the fourth scanning mode, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records the first X-ray projection data; after the distributed X-ray source assembly is driven to a predetermined position using the degree-of-freedom device, at least two focal points in the distributed X-ray source assembly emit X-rays sequentially, and the detector records the fifth X-ray projection data; the imaging device processes the first X-ray projection data and the fifth X-ray projection data using a tomographic synthesis and reconstruction method to generate a tomographic image.

Images