CN107072022B - X-ray tomography method and system - Google Patents

Abstract

The invention belongs to x-ray imaging technology fields, provide a kind of x-ray tomography method and system, the described method includes: in scanning, controller starts the x-ray source on multifocal spot X source array according to preset scan pattern one by one and carries out pulsed transmitting, and control current X-ray source and irradiate sweep object according to its preset pulse exposure time, so that the x-ray source on different arrangement positions is irradiated to the field dose on sweep object and reaches unanimity；The x-ray source that detector acquires on different arrangement positions is irradiated to the projected image after sweep object, and the projected image is transferred to terminal device；Terminal device goes out the 3-D image of the sweep object according to the backprojection image reconstruction.The present invention adjusts the quality of projected image by control pulse exposure time, and the mode hardware cost relative to adjusting tube current is low, degree of regulation is high, and can be effectively reduced the integral radiation dosage of scanning process under the premise of guaranteeing image quality.

Description

X-ray tomography method and system

technical field

The invention belongs to the technical field of X-ray imaging, and in particular relates to an X-ray tomography scanning method and system.

Background technique

With the application of cold cathodes in X-ray sources, static multi-angle scanning imaging can be achieved by using a multi-focal X-ray source array integrated with multiple cold cathodes. Since the multi-focal spot X-ray source array needs to arrange dozens of X-ray sources on a limited geometric structure, the existing easy-to-implement array form is a linear structure. When the multi-focal spot X-ray source array adopts a linear array parallel to the detector plane, the angles at which the X-ray sources in different arrangement positions illuminate the scanning object are different from each other, and the X-ray sources arranged in the central area are far from the scanning object. Closer, the X-ray sources arranged at both ends are far from the scanning object, and the distance from the X-ray source to the center of the scanning object is represented by SOD. FIG. 1 shows a schematic diagram of scanning at different angles of a multi-focal spot X light source array with a linear structure. In FIG. 1 , the multi-focal spot X-ray source array includes n X-ray sources, and is symmetrical with respect to the X-ray source located in the central region nm. When multi-angle static scanning is adopted, the X-ray beam paths of the X-ray sources arranged at different positions to the scanned object are different, and the X-ray sources arranged at both ends have a longer path than the X-ray source in the middle. Since the X-ray radiation dose mAs is inversely proportional to the square of the distance from the X-ray source to the center of the scanning object, that is, SOD ² *mAs=K, where K is a preset value, so the scanning object receives X-rays from the X-ray source in the middle part The radiation dose is higher than that of the X-ray sources arranged at both ends, that is, the surface dose of the X-ray sources irradiated to the scanned object by the X-ray sources in different arrangement positions is inconsistent, resulting in inconsistent projection images collected by the detector under the irradiation of the X-ray sources at different angles. uniform, which affects the quality of image reconstruction.

In order to solve the problem of inconsistent surface doses irradiated by the X-ray sources in different positions of the linear multi-focal spot X-ray source array to the scanned object, there are mainly two existing solutions:

One is to adjust the output dose of the X-ray source in different arrangement positions, that is, to adjust the tube current of the X-ray source, so that the surface dose of the X-ray source irradiated to the scanning object is the same. When adjusting the tube current, it can be achieved by adjusting the gate voltage and connecting an adjustable resistor in series. The implementation of adjusting the gate voltage includes adjusting the gate voltage in real time and fixing the gate voltage in advance. Since the multi-focal spot X-ray source array adopts the pulse exposure method, the exposure time of each X-ray source is very short, so it is difficult to adjust the tube current by adjusting the grid voltage in real time; and the method of pre-fixing the grid voltage requires the use of multiple The gate high voltage power supply will greatly increase the overall cost. Although the cost of connecting adjustable resistors in series is low, the operation process is troublesome and the adjustment accuracy is not high.

Another solution is to perform image intensity normalization during image reconstruction. This solution is simpler than adjusting the tube current, but in order to ensure the quality of the reconstructed image, it is necessary to take the radiation dose of the X-ray sources arranged at both ends to the scanned object as the minimum standard, which will increase the X-rays arranged in the middle. The radiation intensity of the source to the scanned object, so the overall radiation dose is increased on the premise of ensuring the image quality.

SUMMARY OF THE INVENTION

In view of this, embodiments of the present invention provide an X-ray tomography scanning method and system, so as to improve the adjustment accuracy of the X-ray tomography scanning and reduce the overall radiation dose in the scanning process.

In a first aspect, an X-ray tomography method is provided, the method comprising:

During scanning, the controller starts the X-ray sources on the multi-focal spot X-ray source array one by one according to the preset scanning mode to perform pulsed emission, and controls the current X-ray source to irradiate the scanning object according to its preset pulse exposure time, so as to make The surface doses irradiated by the X-ray sources in different positions to the scanned object tend to be consistent;

The detector collects projection images after the X-ray sources at different arrangement positions irradiate the scanning object, and transmits the projection images to the terminal device;

The terminal device reconstructs a three-dimensional image of the scanned object according to the projection image.

Further, the pulse exposure time is obtained according to the surface dose threshold of the scanning object under the minimum imaging requirement and the radiation dose of the X-ray source to the scanning object.

Further, the method also includes:

Before scanning, the detector sends an exposure preparation signal to the controller;

After receiving the exposure preparation signal sent by the detector, the controller sends a feedback signal to the detector;

After receiving the feedback signal, the detector outputs a scan trigger timing signal to the controller according to a preset acquisition mode;

The controller activates the X-ray sources on the multi-focal spot X-ray source array one by one according to the preset scanning mode to perform pulsed emission, which specifically includes:

After receiving the scanning trigger timing signal, the controller activates the X-ray sources on the multi-focal spot X-ray source array one by one to perform pulsed emission according to a preset scanning mode.

Further, before the detector sends an exposure preparation signal to the controller, the method further includes:

The terminal device initializes the detector, sets the acquisition mode, sends the preset scanning mode and time compensation parameters to the controller, and sets the grid high voltage power supply and anode high voltage power supply of the multifocal X-ray source array ;

Wherein, the time compensation parameter includes the pulse exposure time corresponding to the X-ray sources at different arrangement positions in the multifocal X-ray source array.

In a second aspect, an X-ray tomography system is provided, the system includes a controller, a detector and a terminal device;

The controller is used to, during scanning, start the X-ray sources on the multi-focal spot X-ray source array one by one to perform pulsed emission according to a preset scanning mode, and control the current X-ray source to irradiate and scan according to its preset pulse exposure time object, so that the surface doses irradiated by X-ray sources of different angles to the scanned object tend to be consistent;

The detector is used for collecting projection images after the X-ray sources at different arrangement positions irradiate the scanning object, and transmitting the projection images to the terminal device;

The terminal device is configured to reconstruct a three-dimensional image of the scanned object according to the projection image.

Further, the pulse exposure time is obtained according to the surface dose threshold of the scanning object under the minimum imaging requirement and the radiation dose of the X-ray source to the scanning object.

Further, the detector is further configured to send an exposure preparation signal to the controller before scanning;

The controller is further configured to, after receiving the exposure preparation signal sent by the detector, send a feedback signal to the detector;

The detector is further configured to, after receiving the feedback signal, output a scan trigger timing signal to the controller according to a preset acquisition mode;

The controller is further configured to, after receiving the scanning trigger timing signal, start the X-ray sources on the multi-focal spot X-ray source array one by one to perform pulsed emission according to a preset scanning mode.

Further, the terminal device is further configured to initialize the detector, set the acquisition mode, and send the preset scan mode and time compensation parameters before the detector sends an exposure preparation signal to the controller. to the controller, and set the grid high voltage power supply and the anode high voltage power supply of the multi-focal spot X light source array;

Wherein, the time compensation parameter includes the pulse exposure time corresponding to the X-ray sources at different arrangement positions in the multifocal X-ray source array.

Compared with the prior art, in the embodiment of the present invention, the controller starts the X-ray sources on the multi-focal spot X-ray source array one by one according to the preset scanning mode to perform pulsed emission during scanning, and controls the current X-ray source according to the preset scanning mode. The preset pulse exposure time irradiates the scanning object, so that the surface doses irradiated by the X-ray sources in different positions to the scanning object tend to be consistent; the detector collects the X-ray sources in different positions and irradiates the scanning object The projected image behind the object, and the projected image is transmitted to the terminal device; the terminal device reconstructs the three-dimensional image of the scanned object according to the projected image; the embodiment of the present invention adjusts the projected image by controlling the exposure time. Compared with the method of adjusting the tube current, the hardware cost is low, the adjustment precision is high, and the overall radiation dose of the scanning process can be effectively reduced on the premise of ensuring the imaging quality.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the scanning schematic diagram of different angles of the multi-focal spot X light source array of linear structure;

Fig. 2 is the composition structure diagram of the X-ray tomography system provided by the first embodiment of the present invention;

Fig. 3 is the realization flow chart of the X-ray tomography scanning method provided by the second embodiment of the present invention;

Fig. 4 is the realization flow chart of the X-ray tomography scanning method provided by the third embodiment of the present invention;

FIG. 5 is a schematic diagram of scanning timing control provided by a third embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

In the embodiment of the present invention, during scanning, the controller activates the X-ray sources on the multi-focal spot X-ray source array one by one according to a preset scanning mode to perform pulsed emission, and controls the current X-ray source according to its preset pulse exposure time The scanning object is irradiated so that the surface doses irradiated by the X-ray sources in different arrangement positions on the scanning object tend to be consistent; the detector collects the projection images of the X-ray sources in different arrangement positions irradiating the scanning object, and The projection image is transmitted to the terminal device; the terminal device reconstructs the three-dimensional image of the scanned object according to the projection image; in the embodiment of the present invention, the quality of the projection image is adjusted by controlling the exposure time, compared with adjusting the tube current The method has low hardware cost, high adjustment accuracy, and can effectively reduce the overall radiation dose in the scanning process on the premise of ensuring the imaging quality. The embodiments of the present invention also provide corresponding systems, which will be described in detail below.

FIG. 2 shows the composition and structure of the X-ray tomography system provided by the first embodiment of the present invention. For convenience of description, only the parts related to the embodiment of the present invention are shown.

As shown in FIG. 2 , the X-ray tomography system is composed of a terminal device 1 , a detector 2 , an anode high-voltage power supply 3 , a grid high-voltage power supply 4 , a controller 5 and a multi-focal X-ray source array 6 .

The detector 2 , the input terminal of the anode high voltage power supply 3 , the input terminal of the grid high voltage power supply 4 and the controller 5 are respectively connected to the terminal device 1 . The controller 5 is also connected to the detector 2 . In the embodiment of the present invention, the multi-focal spot X-ray source array 6 includes a plurality of X-ray sources. The X-ray source is a cold cathode field electron emission source, each X-ray source includes a cathode, a grid and an anode, and the multi-focal spot X-ray source array is formed by a linear integral package. Wherein, the grids of the X-ray sources are all connected to the output end of the grid high voltage power supply, and the anodes of the X-ray source are all connected to the output end of the anode high voltage power supply.

In the embodiment of the present invention, the terminal device 1 is configured to initialize the detector 2, set the acquisition mode, and set the preset acquisition mode before the detector 2 sends an exposure preparation signal to the controller 5. The scanning mode and time compensation parameters are sent to the controller 5 , and the grid high voltage power supply 2 and the anode high voltage power supply 3 of the multifocal spot X light source array 6 are set.

Wherein, the time compensation parameter is the pulse exposure time corresponding to the X-ray sources at different arrangement positions in the multifocal X-ray source array. Here, the pulse exposure time is obtained according to the surface dose threshold of the scanned object under the minimum imaging requirement and the radiation dose of the X-ray source to the scanned object. The X-ray dosimeter can be calibrated in advance according to the surface dose threshold of the scanned object under the minimum imaging requirements.

After completing the initialization, the detector 2 is used to send an exposure preparation signal to the controller 5 before scanning.

The controller 5 is further configured to send a feedback signal to the detector 2 after receiving the exposure preparation signal sent by the detector 2 .

The detector 2 is further configured to, after receiving the feedback signal, output a scan trigger timing signal to the controller 5 according to a preset acquisition mode.

The controller 5 is further configured to start the X-ray sources on the multi-focal spot X-ray source array 6 one by one according to a preset scanning mode after receiving the scanning trigger timing signal.

Further, the controller 5 is used to, during scanning, start the X-ray sources on the multi-focal spot X-ray source array 6 one by one to perform pulsed scanning according to a preset scanning mode, and control the current X-ray source according to its preset scanning mode. The pulse exposure time is 100000000000000000 0000000000000000000000000000000000000000 The pulse exposure time is used to irradiate the scanning object, so that the surface doses irradiated on the scanning object by the X-ray sources of different angles tend to be consistent.

The detector 2 is used for collecting projection images after the X-ray sources at different arrangement positions irradiate the scanning object, and transmitting the projection images to the terminal device 1 .

The terminal device 1 is further configured to reconstruct a three-dimensional image of the scanned object according to the projection image.

Here, in the embodiment of the present invention, by controlling the exposure time, the surface dose of each X-ray source when irradiating the scanning object tends to be consistent, so that the quality of the projection images collected under the irradiation of each X-ray source tends to be consistent, and further Improves the quality of reconstructed 3D images of scanned objects. The embodiment of the present invention only needs to develop a corresponding control circuit to control the pulse exposure time of different X-ray sources. Compared with the method of adjusting the tube current, the hardware cost is low and the adjustment precision is high; and the pulse exposure time can be adjusted so that the scanning object receives different The surface dose of the angled X-ray source is all under the radiation intensity required by the minimum imaging requirements, which not only ensures the imaging quality, but also effectively reduces the overall radiation dose in the scanning process.

FIG. 3 shows an implementation flow of the X-ray tomography method provided in Embodiment 2 of the present invention. Referring to Figure 3, the X-ray tomography method includes:

In step S301, during scanning, the controller activates the X-ray sources on the multifocal X-ray source array one by one to perform pulsed emission according to a preset scanning mode, and controls the current X-ray source to irradiate according to its preset pulse exposure time The object is scanned, so that the surface doses irradiated by the X-ray sources in different arrangement positions on the scanned object tend to be consistent.

In an embodiment of the present invention, the multi-focal spot X-ray source array includes a plurality of X-ray sources. The X-ray source is a cold cathode field electron emission source, and the multi-focal spot X-ray source array is formed through a linear integral package. Optionally, a carbon nanotube cathode can be used as the electron emission source in practice.

The scanning mode is the pulse exposure sequence of the X-ray source on the multi-focal spot X-ray source array. Optionally, the scanning mode may be point-by-point sequential scanning, or may be scanning according to a specified X-ray emission source point.

The pulse exposure time is the duration that the X-ray source irradiates the scanning object. In the embodiment of the present invention, on the multi-focal spot X-ray source array, the X-ray sources in different arrangement positions have different pulse exposure times. The surface dose is the radiation dose that the X-rays emitted by the X-ray source actually reach the scanned object during the pulse exposure time. Wherein, the radiation dose is the amount of X-rays emitted by the X-ray sources at different arrangement positions on the multifocal X-ray source array. The radiation dose is inversely proportional to the square of the distance from the X-ray source to the center point of the scanned object. Since the radiation dose is inversely proportional to the square of the distance, the radiation dose of the X-ray source located at the center of the multifocal X-ray source array is the largest, and the radiation dose of the X-ray sources located at both ends is the smallest. In the present invention, the X-ray sources at different arrangement positions are set to correspond to different pulse exposure times, and the X-ray sources irradiate the scanning object according to their corresponding pulse exposure times, so that the X-ray sources emitted by each X-ray source are The actual surface dose of rays reaching the scanned object tends to be consistent, specifically, tends to a preset surface dose threshold of the scanned object, thereby ensuring the consistency of the quality of the projection images irradiated by each X-ray source.

In step S302, the detector collects projection images after the X-ray sources at different arrangement positions irradiate the scanning object, and transmits the projection images to the terminal device.

In step S303, the terminal device reconstructs a three-dimensional image of the scanned object according to the projection image.

When the multifocal spot X light source array is under the action of the grid high voltage, when the cathode reaches the voltage required for field emission, the electrons escape from the cathode surface and are accelerated under the action of the anode high voltage to form a high-speed electron beam bombarding the anode target X-rays are generated. At this time, the detector detects the attenuated X-rays irradiated by the X-ray source to the scanning object, performs photoelectric conversion and A/D conversion, and finally converts them into two-dimensional projection data, that is, projection images, and then transmits them. to the terminal device. By analogy, when the next X-ray source on the multi-focal spot X-ray source array completes irradiation, the detector performs the next projection image acquisition. After the projection image corresponding to each X-ray source on the multifocal spot X-ray source array is obtained, the terminal device performs reconstruction according to the projection image.

Exemplarily, the surface dose threshold of the scanning object may be set in advance according to the minimum radiation intensity required for imaging, and then an X-ray dosimeter is used to measure when each X-ray source on the multifocal X-ray source array irradiates the scanning object. The time required for the radiation dose to reach the surface dose threshold is used as the pulse exposure time of the X-ray source. Referring to the scanning schematic diagram of different angles of the linear multi-focal spot X-ray source array shown in FIG. 1, the X-ray light speed paths of the X-ray sources in different arrangement positions irradiating the scanning object are different, and the X-ray sources arranged at both ends are more The path of the X-ray source in the middle is longer. According to the square of the distance from the X-ray source to the center of the scanned object, the radiation dose of the X-ray source is inversely proportional. It can be obtained that the radiation dose of the X-ray source in the middle part is higher than that of the X-ray source at both ends. Radiation doses are high. Therefore, after setting the surface dose threshold of the scanned object according to the minimum radiation intensity required for imaging, the pulse exposure time required by the X-ray source located at the very center of the multi-focal spot X-ray source array is measured by the X-ray source dosimeter. The shortest, the pulse exposure time of the X-ray sources at both ends increases sequentially. Since the X-ray sources of the multi-focal spot X-ray source array are symmetrically distributed, the pulse exposure times of X-ray source 1 and X-ray source n at both ends are the same, and so on.

By controlling the exposure time in the embodiment of the present invention, the hardware cost is low and the adjustment accuracy is high compared to the method of adjusting the tube current; and the pulse exposure time can be adjusted so that the surface dose of the scanned object receiving X-ray sources of different angles is within the minimum imaging requirements. Under the required radiation intensity, it not only ensures the imaging quality, but also effectively reduces the overall radiation dose in the scanning process.

Further, based on the X-ray tomography scanning method provided by the second embodiment of the present invention, a third embodiment of the X-ray tomography scanning method of the present invention is proposed. As shown in FIG. 4 , it is the X-ray tomography scanning method provided by the third embodiment of the present invention. In the embodiment of the present invention, the X-ray tomography method is applied to an X-ray imaging system composed of a terminal device 1 , a detector 2 , an anode high-voltage power supply 3 , a grid high-voltage power supply 4 , a controller 5 and a multifocal X-ray source array 6 . Ray tomography system.

Referring to Figure 4, the X-ray tomography method includes:

In step S401, the terminal device initializes the detector, sets the acquisition mode, sends the preset scanning mode and time compensation parameters to the controller, and sets the gate high voltage of the multifocal spot X light source array power supply and anode high voltage power supply.

Wherein, the time compensation parameter includes the pulse exposure time corresponding to the X-ray sources at different arrangement positions in the multifocal X-ray source array. The X-ray dosimeter can be calibrated in advance according to the surface dose threshold of the scanned object under the minimum imaging requirements.

In the embodiment of the present invention, upper computer software is installed on the terminal device, and the upper computer software is used to receive the input operation of the user, and according to the input operation, the detector, the controller and the grid high-voltage power supply and The anode high voltage power supply is initialized. Exemplarily, the gate voltage power supply, the anode voltage power supply and the controller can be integrated on the LabVIEW host computer platform for control. The pulse exposure time can be a value less than 200ms; the gate high voltage power supply can be output in a constant current mode, the output current can be 10mA and above, and the output voltage can be 2kV; the output voltage of the anode high voltage power supply can be 20 to 50kV .

In step S402, the detector sends an exposure preparation signal to the controller.

Exemplarily, the detector can be an ASX-2430 amorphous selenium digital flat panel detector. After the detector completes initialization according to the instruction of the terminal device, it sends an exposure preparation signal to the controller to inform the controller that it is ready.

In step S403, after receiving the exposure preparation signal sent by the detector, the controller sends a feedback signal to the detector.

If the exposure preparation signal received by the controller is valid, a feedback signal is sent to the detector.

In step S404, after receiving the feedback signal, the detector outputs a scan trigger timing signal to the controller according to a preset acquisition mode.

In step S405, after receiving the scan trigger timing signal, the controller starts the X-ray sources on the multi-focal spot X-ray source array one by one according to a preset scan mode.

Here, after receiving the scanning trigger timing signal of the detector, the controller sequentially turns on the gate voltage required by the X-ray source on the multi-focal spot X-ray source array according to the preset scanning mode, and according to the preset scanning mode The pulse compensation time is used for pulsed electron emission; and the current X-ray source is controlled to irradiate the scanning object according to its preset pulse exposure time, so that the X-ray sources in different arrangement positions irradiate the same surface dose on the scanning object. The pulse exposure time is obtained according to the surface dose threshold of the scanning object under the minimum imaging requirement and the radiation dose of the X-ray source to the scanning object.

In step S406, the detector collects projection images after different X-ray sources irradiate the scanning object, and transmits the projection images to the terminal device.

In step S407, the terminal device reconstructs a three-dimensional image of the scanned object according to the projection image.

When the multi-focal spot X light source array is under the action of the grid high voltage, when the cathode reaches the voltage required for field emission, electrons escape from the cathode surface and are accelerated under the action of the anode high voltage to form a high-speed electron beam bombarding the anode target X-rays are generated. At this time, the detector detects the attenuated X-rays irradiated by the X-ray source to the scanning object, performs photoelectric conversion and A/D conversion, and finally converts them into two-dimensional projection data, that is, projection images, and then transmits them. to the terminal device. After obtaining the projection image corresponding to each X-ray source on the multi-focal spot X-ray source array, reconstruction is performed by the terminal device according to the projection image.

By controlling the exposure time in the embodiment of the present invention, the hardware cost is low and the adjustment accuracy is high compared to the method of adjusting the tube current; and the pulse exposure time can be adjusted so that the surface dose of the scanned object receiving X-ray sources of different angles is within the minimum imaging requirements. Under the required radiation intensity, it not only ensures the imaging quality, but also effectively reduces the overall radiation dose during the scanning process.

Here, the scanning sequence of the X-ray tomography scanning method provided by the embodiment of the present invention is described by taking the multi-focal spot X light source array shown in FIG. 1 as an example. As shown in FIG. 5 , it is a schematic diagram of scanning timing control provided by the third embodiment of the present invention. The numbering of the X-ray source in FIG. 5 is the same as the numbering in the multifocal spot X-ray source in FIG. 1 . It can be seen from the scanning trigger timing signal of the detector in Fig. 5 that the time for the detector to collect a frame of projection image consists of the integration time T1 and the readout time T2, and the detector receives X-rays within the integration time T1. Therefore, each The maximum value of the pulse exposure time of the X-ray source is the integration time of the detector. The pulse exposure time required for the X-ray source nm located in the very center is the shortest. In the scanning timing control schematic diagram of FIG. 5, it is represented by time T, and the pulse exposure time of the X-ray source at both ends increases sequentially, which is T+k _1,...,n Δt, and Δt is the unit increment. Since the multi-focal spot X-ray source array is symmetrically distributed with the X-ray source nm as the center, the X-ray source 1 at both ends needs the same pulse exposure time as the X-ray source n, that is, T+k ₁ Δt=T+k _n Δt, and so on.

To sum up, in the embodiment of the present invention, during scanning, the controller starts the X-ray sources on the multi-focal spot X light source array one by one according to the preset scanning mode to perform pulsed emission, and controls the current X-ray source according to its preset scanning mode. The set pulse exposure time irradiates the scanning object, so that the surface dose of the X-ray sources in different arrangement positions irradiated to the scanning object is the same; the detector collects the projections of the X-ray sources in different arrangement positions irradiating the scanning object image, and transmits the projected image to the terminal device; the terminal device reconstructs the three-dimensional image of the scanned object according to the projected image; the embodiment of the present invention adjusts the quality of the projected image by controlling the exposure time, compared to the adjustment tube The current method has low hardware cost and high adjustment accuracy, and can effectively reduce the overall radiation dose in the scanning process on the premise of ensuring imaging quality.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific working process of the above-described devices and units, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed method and system may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the modules and units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit and module in each embodiment of the present invention may be integrated in one processing unit, or each unit and module may exist physically alone, or two or more units and modules may be integrated in one unit .

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (4)

1. a kind of x-ray tomography method, which is characterized in that the described method includes:

Detector sends exposure ready signal to controller；

For the controller after receiving the exposure ready signal that the detector is sent, Xiang Suoshu detector sends feedback letter Number；

The detector exports scanning touching to the controller after receiving the feedback signal, according to preset acquisition mode Send out clock signal；

Controller starts multifocal spot X-ray according to preset scan pattern after receiving the scanning triggering clock signal one by one X-ray source on the array of source carries out pulsed transmitting, and controls current X-ray source and irradiate according to its preset pulse exposure time Sweep object, so that the x-ray source on different arrangement positions is irradiated to the field dose on sweep object and reaches unanimity；Its In, the pulse exposure time is the duration that the x-ray source is irradiated to the sweep object, the pulse exposure time According under minimum imaging requirements sweep object field dose threshold value and x-ray source the dose of radiation of sweep object is obtained；

The x-ray source that detector acquires on the different arrangement positions is irradiated to the projected image after sweep object, and will be described Projected image is transferred to terminal device；

The terminal device goes out the 3-D image of the sweep object according to the backprojection image reconstruction.

2. x-ray tomography method as described in claim 1, which is characterized in that sent in the detector to controller Before exposing ready signal, the method also includes:

Terminal device initializes the detector, and acquisition mode is arranged, and preset scan pattern and time bias are joined Number is sent to the controller, and the grid high voltage power supply and anode high voltage power supply of the setting multifocal spot X source array；

Wherein, the time bias parameter includes that the x-ray source in the multifocal spot X source array on different arrangement positions is corresponding Pulse exposure time.

3. a kind of x-ray tomography system, which is characterized in that the system comprises controller, detector and terminal devices；

The detector is used for, and Xiang Suoshu controller sends exposure ready signal；

The controller is used for, and after receiving the exposure ready signal that the detector is sent, Xiang Suoshu detector sends anti- Feedback signal；

The detector is also used to, defeated to the controller according to preset acquisition mode after receiving the feedback signal Scanning triggering clock signal out；

The controller is also used to, and after receiving the scanning triggering clock signal, is opened one by one according to preset scan pattern The x-ray source moved on multifocal spot X source array carries out pulsed transmitting, and controls current X-ray source according to its preset pulse Time for exposure irradiates sweep object, so that the x-ray source of different angle, which is irradiated to the field dose on sweep object, tends to one It causes；Wherein, the pulse exposure time is the duration that the x-ray source is irradiated to the sweep object, and the pulse exposes Between light time according under minimum imaging requirements sweep object field dose threshold value and x-ray source the dose of radiation of sweep object is obtained It arrives；

The detector is also used to, and the x-ray source acquired on the different arrangement positions is irradiated to the perspective view after sweep object Picture, and the projected image is transferred to terminal device；

The terminal device is used for, and the 3-D image of the sweep object is gone out according to the backprojection image reconstruction.

4. x-ray tomography system as claimed in claim 3, which is characterized in that the terminal device is also used to, described Before detector sends exposure ready signal to the controller, the detector is initialized, acquisition mode is set, it will be pre- If scan pattern and time bias parameter be sent to the controller, and the grid of the setting multifocal spot X source array High voltage power supply and anode high voltage power supply；

Wherein, the time bias parameter includes that the x-ray source in the multifocal spot X source array on different arrangement positions is corresponding Pulse exposure time.