CN107072022B - X-ray tomography method and system - Google Patents
X-ray tomography method and system Download PDFInfo
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- CN107072022B CN107072022B CN201611173895.4A CN201611173895A CN107072022B CN 107072022 B CN107072022 B CN 107072022B CN 201611173895 A CN201611173895 A CN 201611173895A CN 107072022 B CN107072022 B CN 107072022B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
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- H05G1/38—Exposure time
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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
Technical field
The invention belongs to x-ray imaging technology field more particularly to a kind of x-ray tomography method and system.
Background technique
With application of the cold cathode on x-ray source, can be realized using the multifocal spot X source array that multiple cold cathodes integrate
The scanning imagery of static multi-angle.Since multifocal spot X source array needs to arrange tens X-rays on limited geometry
Source, existing array format easy to accomplish are linear structure.When multifocal spot X source array is using parallel with detector plane
When linear array, the angle of the x-ray source irradiation sweep object on difference arrangement position is different, and is arranged in center
The x-ray source range sweep object in domain is closer, is arranged in the x-ray source range sweep object at both ends farther out, x-ray source to scanning
The distance of object centers is indicated with SOD.The scanning that Fig. 1 shows the multifocal spot X source array different angle of linear structure is shown
It is intended to.In Fig. 1, the multifocal spot X source array includes n x-ray source, and about the x-ray source n-m for being located at central area
Symmetrically.When using multi-angle static scanning, the x-ray source of different arrangement positions is irradiated to the X-ray beam road of sweep object
Diameter is different, is arranged in the x-ray source at both ends than intermediate x-ray source path length.Due to X-ray radiation dosage mAs and x-ray source
Distance to sweep object center square is inversely proportional, i.e. SOD2* mAs=K, wherein K is preset value, therefore sweep object receives
The X-ray radiation dosage come out to middle section x-ray source is higher than the x-ray source for being arranged in both ends, i.e., different arrangement positions
On x-ray source be irradiated to sweep object field dose be it is inconsistent, lead to the collected different angle x-ray source of detector
Projected image under irradiation is uneven, to affect the quality of image reconstruction.
In order to solve the table that the x-ray source of linear type multifocal spot X source array difference arrangement position is irradiated to sweep object
The inconsistent problem of face dosage, there are mainly two types of existing solutions:
One is the x-ray source exit doses for adjusting different arrangement positions, that is, adjust the tube current of x-ray source, so that
The field dose that the x-ray source is irradiated to sweep object is identical.It, can be by adjusting grid voltage and string when adjusting tube current
The mode of connection adjustable resistance is realized.The implementation for adjusting grid voltage includes adjusting grid voltage and in advance fixed grid in real time
Voltage.Since multifocal spot X source array uses pulse exposure mode, the time for exposure of each x-ray source is very short, and therefore, it is difficult to logical
Cross the adjusting for adjusting grid voltage realization in real time to tube current；And the mode for fixing grid voltage in advance is needed using more grids
High voltage power supply can greatly increase overall cost.Although cost is relatively low for the mode of serial adjustable resistance, operating process is number
Tired, degree of regulation is not also high.
Another solution is the progress image intensity normalized in image reconstruction process.The solution is opposite
Regulation pipe current system is easier, however, to ensure that the quality of reconstruction image, needs to be arranged in the irradiation of the x-ray source at both ends
Dose of radiation to sweep object is minimum standard, this will increase, and to be arranged in intermediate x-ray source strong to the radiation of sweep object
Degree, therefore under the premise of guaranteeing picture quality, increase integral radiation dosage.
Summary of the invention
In consideration of it, the embodiment of the invention provides a kind of x-ray tomography method and system, to improve x-ray tomography
The degree of regulation of scanning, and reduce the integral radiation dosage of scanning process.
In a first aspect, providing a kind of x-ray tomography method, which comprises
Scanning when, controller according to preset scan pattern start one by one the x-ray source on multifocal spot X source array into
The transmitting of row pulsed, and control current X-ray source and irradiate sweep object according to its preset pulse exposure time, so that different
X-ray source on arrangement position is irradiated to the field dose on sweep object and reaches unanimity；
The x-ray source that detector acquires on the different arrangement positions is irradiated to the projected image after sweep object, and will
The 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.
Further, the pulse exposure time is according to the sweep object field dose threshold value and X under minimum imaging requirements
Radiographic source obtains the dose of radiation of sweep object.
Further, the method also includes:
Before scanning, the detector sends exposure ready signal to the controller；
For the controller after receiving the exposure ready signal that the detector is sent, Xiang Suoshu detector sends feedback
Signal；
The detector is swept after receiving the feedback signal, according to preset acquisition mode to controller output
Retouch triggering clock signal；
The controller starts the x-ray source on multifocal spot X source array according to preset scan pattern one by one and carries out arteries and veins
Formula transmitting is rushed, is specifically included:
The controller starts more one by one after receiving the scanning triggering clock signal according to preset scan pattern
X-ray source on focal spot X source array carries out pulsed transmitting.
Further, before the detector sends exposure ready signal to the controller, the method also includes:
Terminal device initializes the detector, and acquisition mode is arranged, and preset scan pattern and time are mended
It repays parameter and is sent to the controller, and the grid high voltage power supply and anode high voltage electricity of the setting multifocal spot X source array
Source；
Wherein, the time bias parameter includes the x-ray source in the multifocal spot X source array on different arrangement positions
Corresponding pulse exposure time.
Second aspect provides a kind of x-ray tomography system, and the system comprises controller, detector and terminals
Equipment；
The controller is used for, and in scanning, is started on multifocal spot X source array one by one according to preset scan pattern
X-ray source carries out pulsed transmitting, and controls current X-ray source and irradiate sweep object according to its preset pulse exposure time,
It reaches unanimity so that the x-ray source of different angle is irradiated to the field dose on sweep object；
The detector is used for, and the x-ray source acquired on the different arrangement positions is irradiated to the projection after sweep object
Image, 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.
Further, the pulse exposure time is according to the sweep object field dose threshold value and X under minimum imaging requirements
Radiographic source obtains the dose of radiation of sweep object.
Further, the detector is also used to, and before scanning, Xiang Suoshu controller sends exposure ready signal；
The controller is also used to, after receiving the exposure ready signal that the detector is sent, Xiang Suoshu detector
Send feedback signal；
The detector is also used to, after receiving the feedback signal, according to preset acquisition mode to the control
Device output scanning triggering clock signal；
The controller is also used to, after receiving scanning triggering clock signal, according to preset scan pattern by
X-ray source on a multifocal spot X source array of starting carries out pulsed transmitting.
Further, the terminal device is also used to, and sends exposure ready signal to the controller in the detector
Before, the detector is initialized, acquisition mode is set, preset scan pattern and time bias parameter are sent to institute
State 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 the x-ray source in the multifocal spot X source array on different arrangement positions
Corresponding pulse exposure time.
Compared with prior art, the embodiment of the present invention by scanning when, by controller according to preset scan pattern by
X-ray source on a multifocal spot X source array of starting carries out pulsed transmitting, and it is preset according to its to control current X-ray source
Pulse exposure time irradiates sweep object, so that the x-ray source on different arrangement positions is irradiated to the surface on sweep object
Dosage reaches unanimity；The x-ray source that detector then acquires on different arrangement positions is irradiated to the projected image after sweep object, and
The projected image is transferred to terminal device；The terminal device then goes out the sweep object according to the backprojection image reconstruction
3-D image；The embodiment of the present invention adjusts the quality of projected image by the control time for exposure, relative to adjusting tube current
Mode hardware cost is low, degree of regulation is high, and scanning process can be effectively reduced under the premise of guaranteeing image quality
Integral radiation dosage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other accompanying drawings can also be obtained according to these attached drawings.
Fig. 1 is the scanning schematic diagram of the multifocal spot X source array different angle of linear structure；
Fig. 2 is the composite structural diagram for the x-ray tomography system that first embodiment of the invention provides；
Fig. 3 is the implementation flow chart for the x-ray tomography method that second embodiment of the invention provides；
Fig. 4 is the implementation flow chart for the x-ray tomography method that third embodiment of the invention provides；
Fig. 5 is the scanning sequence control schematic diagram that third embodiment of the invention provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention by starting multifocal spot X-ray according to preset scan pattern by controller in scanning 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；Detection
The x-ray source that device then acquires on different arrangement positions is irradiated to the projected image after sweep object, and the projected image is passed
It is defeated to arrive terminal device；The terminal device then goes out the 3-D image of the sweep object according to the backprojection image reconstruction；This hair
Bright embodiment adjusts the quality of projected image by the control time for exposure, relative to the mode hardware cost for adjusting tube current
It is low, degree of regulation is high, and the integral radiation dosage of scanning process can be effectively reduced under the premise of guaranteeing image quality.
The embodiment of the invention also provides corresponding systems, and which will be described in detail below.
Fig. 2 shows the composed structures for the x-ray tomography system that first embodiment of the invention provides, for the ease of saying
Bright, only parts related to embodiments of the present invention are shown.
As shown in Fig. 2, the x-ray tomography system is by terminal device 1, detector 2, anode high voltage power supply 3, grid
High voltage power supply 4, controller 5 and multifocal spot X source array 6 composition.
Wherein, the detector 2, the input terminal of anode high voltage power supply 3, the input terminal of grid high voltage power supply 4 and control
Device 5 is connect with the terminal device 1 respectively.The controller 5 is also connect with the detector 2.In embodiments of the present invention, institute
Stating multifocal spot X source array 6 includes multiple x-ray sources.The x-ray source is cold-cathode field electron field emissive source, each X is penetrated
Line source includes a cathode, grid and anode, forms the multifocal spot X source array using linear type overall package.Wherein,
The grid of the x-ray source is connect with the output end of the grid high voltage power supply, and the anode of x-ray source is high with the anode
The output end of voltage source connects.
In embodiments of the present invention, the terminal device 1 is used for, and is sent and is exposed to the controller 5 in the detector 2
Before ready signal, the detector 2 is initialized, acquisition mode is set, preset scan pattern and time bias are joined
Number is sent to the controller 5, and the grid high voltage power supply 2 and anode high voltage power supply of the setting multifocal spot X source array 6
3。
Wherein, the time bias parameter is the x-ray source pair in the multifocal spot X source array on different arrangement positions
The pulse exposure time answered.Herein, the pulse exposure time is according to the sweep object field dose under minimum imaging requirements
Threshold value and x-ray source obtain the dose of radiation of sweep object.It can be previously according to the sweep object table under minimum imaging requirements
Face dosage threshold value, is demarcated using X-ray dosimeter device.
After initialization is complete, the detector 2 is used for, and before scanning, Xiang Suoshu controller 5 sends exposure and prepares letter
Number.
The controller 5 is also used to, after receiving the exposure ready signal that the detector 2 is sent, to the detection
Device 2 sends feedback signal.
The detector 2 is also used to, after receiving the feedback signal, according to preset acquisition mode to the control
The output scanning triggering clock signal of device 5.
The controller 5 is also used to, after receiving scanning triggering clock signal, according to preset scan pattern by
X-ray source on a multifocal spot X source array 6 of starting.
Further, the controller 5 is used for, and in scanning, starts multifocal spot X-ray one by one according to preset scan pattern
X-ray source on source array 6 carries out pulsed scanning, and controls current X-ray source and shine according to its preset pulse exposure time
Sweep object is penetrated, is reached unanimity so that the x-ray source of different angle is irradiated to the field dose on sweep object.
The detector 2 is used for, and the x-ray source acquired on the different arrangement positions is irradiated to the projection after sweep object
Image, and the projected image is transferred to terminal device 1.
The terminal device 1 is also used to, and the 3-D image of the sweep object is gone out according to the backprojection image reconstruction.
Herein, the embodiment of the present invention passes through the control time for exposure, so that when each x-ray source irradiation sweep object
Field dose reaches unanimity, so that the quality of the projected image acquired under the irradiation of each x-ray source reaches unanimity, into
And improve the quality for rebuilding the 3-D image of sweep object.The embodiment of the present invention only needs to develop corresponding control circuit
The pulse exposure time for controlling different x-ray source, relative to adjust tube current mode hardware cost is low, degree of regulation is high；And
Can by adjust pulse exposure time make sweep object receive different angle x-ray source field dose it is minimum at
Under radiation intensity as needed for requiring, image quality not only ensure that, but also significantly reduce the integral radiation dosage of scanning process.
Fig. 3 shows the implementation process of x-ray tomography method provided by Embodiment 2 of the present invention.It is described refering to Fig. 3
X-ray tomography method includes:
In step S301, in scanning, controller starts multifocal spot X source array according to preset scan pattern one by one
On x-ray source carry out pulsed transmitting, and control current X-ray source according to its preset pulse exposure time irradiation scanning pair
As so that the x-ray source on different arrangement positions is irradiated to the field dose on sweep object and reaches unanimity.
It in embodiments of the present invention, include multiple x-ray sources on the multifocal spot X source array.The x-ray source is cold
Cathode Field Electron Emission source forms the multifocal spot X source array by linear type overall package.Optionally, concrete practice
In can using carbon nanotube cathod as electron emission source.
The scan pattern is the pulse exposure timing of the x-ray source on the multifocal spot X source array.Optionally, institute
Stating scan pattern can be point-by-point sequential scan, or be scanned according to specified X-ray emission source point.
The pulse exposure time is the duration that the x-ray source is irradiated to the sweep object.Of the invention real
It applies in example, on the multifocal spot X source array, the x-ray source of difference arrangement position has different pulse exposure times.Institute
State the dose of radiation that the X-ray that field dose is the transmitting of the x-ray source described in pulse exposure time actually reaches sweep object.
Wherein, the dose of radiation is the X-ray of the x-ray source transmitting on the different arrangement positions on the multifocal spot X source array
Amount.The dose of radiation square being inversely proportional at a distance from x-ray source to sweep object central point.Due to dose of radiation and distance
Square be inversely proportional, therefore, the dose of radiation of the x-ray source on the center of multifocal spot X source array is maximum, is located at
The dose of radiation of the x-ray source at both ends is minimum.The present invention corresponds to different arteries and veins by the x-ray source being arranged on different arrangement positions
It rushes the time for exposure, and the x-ray source is made to irradiate the sweep object according to its corresponding pulse exposure time, so that
The X-ray of each x-ray source transmitting is actually reached the field dose on sweep object and reaches unanimity, and specially tends to be preset
Sweep object field dose threshold value, so ensure that each x-ray source irradiation under projected image quality consistency.
In step s 302, after the x-ray source that detector acquires on the different arrangement positions is irradiated to sweep object
Projected image, and the projected image is transferred to terminal device.
In step S303, the terminal device goes out the three-dimensional figure of the sweep object according to the backprojection image reconstruction
Picture.
When the multifocal spot X source battle array is under the effect of grid high pressure, when cathode reaches voltage required for Flied emission, electronics
It escapes from cathode surface, and is accelerated under the action of anode high voltage, form high-velocity electron beam bombardment anode target generation X and penetrate
Line is detected at this point, detector is irradiated to the X-ray after sweep object is decayed to the x-ray source and carries out photoelectric conversion
It is converted with A/D, is ultimately converted to two-dimensional projection data, i.e. projected image, is then transferred to terminal device.And so on, work as institute
It states next x-ray source on multifocal spot X source array to complete after irradiating, the detector then carries out projected image next time
Acquisition.After obtaining the corresponding projected image of each x-ray source on the multifocal spot X source array, then set by terminal
It is standby to be rebuild according to the projected image.
Illustratively, the field dose threshold value of sweep object can be set previously according to radiation intensity needed for minimum imaging,
When then measuring the irradiation sweep object of each x-ray source on the multifocal spot X source array using X-ray dosimeter device
Time needed for dose of radiation reaches the field dose threshold value, and using the time as the pulse exposure of the x-ray source
Time.The scanning schematic diagram of the different angle of linear multifocal spot X source array shown in Figure 1, difference arrangement position
On x-ray source be irradiated to sweep object X-ray light velocity path it is different, be arranged in the x-ray source at both ends than intermediate X-ray
Source path will be grown, can according to square being inversely proportional with the dose of radiation of x-ray source for the distance of x-ray source to sweep object center
It is higher than the dose of radiation of the x-ray source at both ends with the dose of radiation for obtaining the x-ray source of middle section.Therefore, in basis
Radiation intensity needed for minimum imaging is arranged after the field dose threshold value of sweep object, is obtained by x-ray source dosemeter measurement,
The pulse exposure time needed for the x-ray source of the center of the multifocal spot X source array is most short, both ends x-ray source
Pulse exposure time successively increases.Since the x-ray source of the multifocal spot X source array is symmetrical, the x-ray source 1 at both ends
It is identical as the pulse exposure time of x-ray source n, and so on.
The embodiment of the present invention passes through the control time for exposure, and the mode hardware cost relative to adjusting tube current is low, adjusts essence
Degree is high；And it can be equal by adjusting the field dose for the x-ray source that pulse exposure time makes sweep object receive different angle
Under the radiation intensity needed for minimum imaging requirements, image quality not only ensure that, but also be effectively reduced the whole spoke of scanning process
Penetrate dosage.
Further, the x-ray tomography method provided based on aforementioned present invention second embodiment proposes X of the present invention
The 3rd embodiment of ray tomography method.As shown in figure 4, being the x-ray tomography that third embodiment of the invention provides
Method.In embodiments of the present invention, the x-ray tomography method is applied to by terminal device 1, detector 2, anode high voltage
Power supply 3, grid high voltage power supply 4, the x-ray tomography system of controller 5 and multifocal spot X source array 6 composition.
Refering to Fig. 4, the x-ray tomography method includes:
In step S401, terminal device initializes the detector, acquisition mode is arranged, by preset scanning
Mode and time bias parameter are sent to the controller, and the grid high voltage power supply of the setting multifocal spot X source array
With anode high voltage power supply.
Wherein, the time bias parameter includes the x-ray source in the multifocal spot X source array on different arrangement positions
Corresponding pulse exposure time.X-ray can be used previously according to the sweep object field dose threshold value under minimum imaging requirements
Dosemeter is demarcated.
In embodiments of the present invention, upper computer software is installed, the upper computer software is for connecing on the terminal device
The input operation of user is received, and is operated according to the input come high to detector, controller and grid high voltage power supply and anode
Voltage source is initialized.Illustratively, the grid voltage power supply, anode voltage power supply and controller can integrate
It is controlled in LabVIEW host computer platform.The pulse exposure time can be the value less than 200ms；The grid high pressure
Power supply can be exported using constant current mode, and output electric current can be 10mA or more, and output voltage can be 2kV；Anode high voltage
The output voltage of power supply can be 20 to 50kV.
In step S402, the detector sends exposure ready signal to the controller.
Illustratively, the detector can select ASX-2430 amorphous selenium digital flat-panel detector.The detector exists
After completing initialization according to the instruction of terminal device, then exposure ready signal is sent to the controller, to inform the control
Device processed is ready.
In step S403, the controller is after the exposure ready signal for receiving detector transmission, to the detection
Device sends feedback signal.
If the exposure ready signal that controller receives is effective, feedback signal is sent to the detector.
In step s 404, the detector is after receiving the feedback signal, according to preset acquisition mode to institute
State controller output scanning triggering clock signal.
In step S405, the controller is after receiving the scanning triggering clock signal, according to preset scanning
Mode starts the x-ray source on multifocal spot X source array one by one.
Herein, controller is after the scanning for receiving detector triggers clock signal, then according to preset scanning
Grid voltage needed for mode gradually opens the x-ray source on multifocal spot X source array, and according to the preset impulse compensation time
Carry out pulsating electronic transmitting；And it controls current X-ray source and irradiates sweep object according to its preset pulse exposure time, with
So that be irradiated to the field dose on sweep object identical for the x-ray sources on different arrangement positions.The pulse exposure time root
According under minimum imaging requirements sweep object field dose threshold value and x-ray source the dose of radiation of sweep object is obtained.
In step S406, detector acquisition different x-ray source is irradiated to the projected image after sweep object, and will
The projected image is transferred to terminal device.
In step S 407, the terminal device goes out the three-dimensional figure of the sweep object according to the backprojection image reconstruction
Picture.
When the multifocal spot X source array is under the effect of grid high pressure, when cathode reaches voltage required for Flied emission, electricity
Son is escaped from cathode surface, and is accelerated under the action of anode high voltage, is formed high-velocity electron beam bombardment anode target generation X and is penetrated
Line is detected at this point, detector is irradiated to the X-ray after sweep object is decayed to the x-ray source and carries out photoelectric conversion
It is converted with A/D, is ultimately converted to two-dimensional projection data, i.e. projected image, is then transferred to terminal device.Obtain it is described multifocal
After the corresponding projected image of each x-ray source on spot X source array, carried out by terminal device according to the projected image
It rebuilds.
The embodiment of the present invention passes through the control time for exposure, and the mode hardware cost relative to adjusting tube current is low, adjusts essence
Degree is high；And it can be equal by adjusting the field dose for the x-ray source that pulse exposure time makes sweep object receive different angle
Under the radiation intensity needed for minimum imaging requirements, image quality not only ensure that, but also significantly reduce the entirety of scanning process
Dose of radiation
Herein, shown in Fig. 1 for multifocal spot X source array, illustrate that X-ray provided in an embodiment of the present invention is disconnected
The scanning sequence of layer scan method.As shown in figure 5, the scanning sequence control schematic diagram provided for third embodiment of the invention.Fig. 5
In the label of x-ray source it is consistent with the label in the multifocal spot x-ray source in Fig. 1.It is triggered from the scanning of the detector in Fig. 5
Clock signal and detects it is found that the time that detector acquires a frame projected image is made of time of integration T1 and readout time T2
Device is that X-ray is received in time of integration T1, and therefore, the maximum value of the pulse exposure time of each x-ray source is the detection
The time of integration of device.Pulse exposure time needed for x-ray source n-m positioned at center is most short.It is controlled in the scanning sequence of Fig. 5
It is indicated in schematic diagram by time T, the pulse exposure time toward the x-ray source at both ends successively increases, and is T+k1,…,nΔ t, Δ t
For unit incrementss.Since multifocal spot x-ray source array is symmetrical, the X positioned at both ends centered on x-ray source n-m
Radiographic source 1 is as pulse exposure time needed for x-ray source n, i.e. T+k1Δ t=T+knΔ t, remaining and so on.
In conclusion the embodiment of the present invention by being started according to preset scan pattern by controller in scanning one by one
X-ray source on multifocal spot X source array carries out pulsed transmitting, and controls current X-ray source and expose according to its preset pulse
Sweep object is irradiated between light time, so that the x-ray source on different arrangement positions is irradiated to the field dose phase on sweep object
Together；The x-ray sources that detector then acquires on different arrangement positions are irradiated to the projected image after sweep object, and by projected image
It is transferred to terminal device；The terminal device then goes out the 3-D image of the sweep object according to the backprojection image reconstruction；This
Inventive embodiments adjust the quality of projected image by the control time for exposure, relative to the mode hardware cost for adjusting tube current
It is low, degree of regulation is high, and the integral radiation dosage of scanning process can be effectively reduced under the premise of guaranteeing image quality.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the device of foregoing description
It with the specific work process of unit, can refer to corresponding processes in the foregoing method embodiment, details are not described herein.
In several embodiments provided herein, it should be understood that disclosed method and system can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the module, unit are drawn
Point, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can
To combine or be desirably integrated into another system, or some features can be ignored or not executed.Another point, it is shown or beg for
The mutual coupling, direct-coupling or communication connection of opinion can be through some interfaces, the INDIRECT COUPLING of device or unit
Or communication connection, it can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the present invention, module can integrate in one processing unit,
Can be each unit, module physically exists alone, can also be integrated in one unit with two or more units, module
In.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention.
And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to 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.
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| CN109953764A (en) * | 2017-12-22 | 2019-07-02 | 有方（合肥）医疗科技有限公司 | X-ray imaging equipment and the method being imaged using x-ray imaging equipment |
| CN108226195B (en) * | 2017-12-28 | 2023-10-13 | 清华大学 | CT inspection system and CT imaging method |
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