CN104586420B - A kind of CT low-dose scannings method, equipment and system - Google Patents
A kind of CT low-dose scannings method, equipment and system Download PDFInfo
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Abstract
The present invention provides a kind of CT low-dose scannings method, equipment and system, and in each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods；T1 is less than T2；X-ray bulb rotates a circle the time used for L, and the number of times for exporting X-ray in L time internal X-rays bulb is n times；T2 is fixed either change, and T1 immobilizes；Detector gathers the scan data of X-ray within each T1 periods, and carrying out processing to scan data obtains CT scan image.When being scanned due to CT machines, X-ray is not to export always, but in each period T2, only there is X-ray output in the T1 times, and other times control X-ray is closed, greatly reduces the dosage of CT machines scanning, can so reduce patient by the dose of radiation scanned.And scan data can be handled using limited view iterative algorithm, i.e., complete CT scan image still can be obtained using few gathered data.
Description
Technical field
The present invention relates to technical field of medical instruments, more particularly to a kind of CT low-dose scannings method, equipment and system.
Background technology
Device-X-ray tube of the X-ray for producing CT scan is introduced first, referring to Fig. 1.
Under the double action of electromagnetic stator and rotor, tungsten anode is rotated, i.e. rotary anode.Certainly, also support
Axle fixes rotary anode.
Heater chain provides filament (cathode filament) certain heater current (Filament Current), and in tungsten sun
Apply certain voltage between pole and filament, so as to produce tube current, i.e. unwrapping wire electric current.Wherein, the voltage of application determines X-ray
Intensity, heater current directly determines the size of unwrapping wire electric current.
In the prior art, X-ray is sent by X-ray bulb.
X-ray bulb launches the X-ray of fladellum, and then the x-ray bombardment of fladellum detects on scanned object
Device detects the scan data of X-ray.These data are carried out imaging by the data for the X-ray that detector passes through detection, so that
Judge the focus on scanned object.
But, this CT scan of the prior art, be X-ray bulb as scanning support does circumference rotation, rotating through
Cheng Zhong, X-ray bulb sends X-ray always, rotates a circle, and detector needs thousands of scan datas.So, due to scanning agent
Amount is very big, and the radiation produced to scanned object is very high.
Therefore, those skilled in the art need to provide a kind of CT scan method, it is possible to reduce the radiation to scanning object.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of CT low-dose scannings method and apparatus, X-ray can be reduced
Radiation to scanned object.
The embodiment of the present invention provides a kind of CT low-dose scannings method, including：
In each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods；The T1 is less than the T2；
The X-ray bulb rotates a circle the time used for L, and the X-ray bulb exports the number of times of X-ray within the L times
For n times；The T2 is fixed either change, and the T1 is changeless；
Detector gathers the scan data of X-ray within each T1 periods, and to the scan data at
Reason obtains CT scan image.
Preferably, in each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods, is specially：
High-voltage deflection device is controlled to change grid voltage by pulse signal, the cycle of the pulse signal is T2, duty
ThanThe grid voltage is used to open in the T1 periods and maintain the X-ray, in the remaining time in T2 cycles
The X-ray is closed in section.
Preferably, the processing acquisition CT scan image that carried out to the scan data is calculated especially by limited view iteration
Method obtains CT scan image, including：
Initial pictures are obtained by algebraically iterative reconstruction algorithm, recycle steepest descent method to seek image poor optimal solution comprehensively,
Obtain detailed image；The limited view iterative algorithm includes the algebraically iterative reconstruction algorithm and the steepest descent method.
Preferably, the N is more than or equal to 20 integer.
The embodiment of the present invention provides a kind of CT low-dose scannings equipment, including：Control module, acquisition module and calculating mould
Block；
The control module, in each period T2, control X-ray bulb output X-ray simultaneously to continue the T1 periods；
The T1 is less than the T2；The X-ray bulb rotates a circle the time used for L, the X-ray ball within the L times
The number of times of pipe output X-ray is n times；The T2 is fixed either change, and the T1 is changeless；
The acquisition module, the data for projection of X-ray is gathered for detector within each T1 periods；
The computing module, CT scan image is obtained for carrying out processing to the scan data.
Preferably, the control module includes control submodule；
The control submodule, controls high-voltage deflection device to change grid voltage by pulse signal；The pulse signal
Cycle be T2, dutycycleThe grid voltage is used to open in the T1 periods and maintain the X-ray, in T2
The X-ray is closed in the remaining period in cycle.
Preferably, the computing module obtains CT scan image especially by limited view iterative algorithm, including：First meter
Operator module and the second calculating sub module；
First calculating sub module, for obtaining initial pictures by algebraically iterative reconstruction algorithm；
Second calculating sub module, for being demanded perfection using steepest descent method to the initial pictures the poor optimal solution in face, is obtained
Obtain image in detail.
The embodiment of the present invention also provides a kind of CT low-dose scannings system, including：X-ray bulb, detector and controller；
The X-ray bulb includes：Rotary anode, cathode filament, high-voltage deflection device；
The high-voltage deflection device is to applying grid voltage, the cathode filament transmitting output electronics on the cathode filament
Beam impacts the rotary anode, produces X-ray；
The X-ray radiation receives scan data on scanned object by the detector；
The high-voltage deflection device is in each period T2, by controlling grid voltage X-ray bulb is exported X-ray simultaneously
Continue the T1 periods；The T1 is less than the T2；The X-ray bulb rotates a circle the time used for L, in the L times
The number of times of the interior X-ray bulb output X-ray is n times；The T2 is fixed either change, and the T1 is to fix not
Become；
The controller, CT scan image is obtained for carrying out processing to the scan data.
Preferably, high-voltage deflection device is controlled to change grid voltage by pulse signal；The cycle of the pulse signal is
T2, dutycycleThe grid voltage is used to open in the T1 periods and maintain the X-ray, remaining in the T2 cycles
Period in close the X-ray.
Preferably, the controller, is specially to lead to first for obtaining CT scan image by limited view iterative algorithm
Cross algebraically iterative reconstruction algorithm and obtain initial pictures, recycle steepest descent method to seek image poor optimal solution comprehensively, obtain in detail
Image；The limited view iterative algorithm includes the algebraically iterative reconstruction algorithm and the steepest descent method.
Compared with prior art, the present invention has advantages below：
The CT low-dose scanning method and apparatus that the present invention is provided, when being scanned due to CT machines, X-ray is not always defeated
Go out, but in each period T2, only there is control X-ray in X-ray output, other times to close in the T1 times, therefore greatly
The big dosage for reducing the scanning of CT machines, can so reduce patient by the dose of radiation scanned.And it can be regarded using limited
Figure iterative algorithm is handled scan data, i.e., complete CT scan image still can be obtained using few gathered data.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of X-ray bulb of the prior art；
Fig. 2 is the schematic diagram for the high-voltage deflection device that the present invention is provided；
Fig. 3 is the flow chart of CT low-dose scannings embodiment of the method one that the present invention is provided；
Fig. 4 is the X-ray bulb of the invention provided with rotary frame rotary course schematic diagram；
Fig. 5 is the sparse gathered data schematic diagram that the present invention is provided；
Fig. 6 is the flow chart of CT low-dose scannings embodiment of the method two that the present invention is provided；
Fig. 7 is the pulse signal timing diagram that the present invention is provided；
Fig. 8 is the schematic diagram of CT low-dose scannings apparatus embodiments one that the present invention is provided；
Fig. 9 is the schematic diagram of CT low-dose scannings apparatus embodiments two that the present invention is provided；
Figure 10 is the schematic diagram of CT low-dose scannings system embodiment one that the present invention is provided.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
Referring to Fig. 2, the figure is the high-voltage deflection schematic device in heater chain of the prior art.
Grid voltage (Grid Voltage) is applied by high-voltage deflection device, grid voltage can control Jiao of X-ray
Point size and deflection, if the first grid voltage and the second grid voltage increase negative potential, the electricity that cathode filament is sent jointly
Beamlet can be because be narrowed by " extruding ".When the first grid voltage and the second grid voltage are increased to 5000V, it can close
X-ray.
Embodiment of the method one：
Referring to Fig. 3, the flow chart of CT low-dose scannings embodiment of the method one that the figure provides for the present invention.
The CT low-dose scanning methods that the present embodiment is provided, including：
S301：In each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods；The T1 is less than institute
State T2；The X-ray bulb rotates a circle the time used for L, the X-ray bulb output X-ray within the L times
Number of times is n times.The T2 is fixed either change, and the T1 is changeless；
It is understood that when T2 is fixed, i.e., corresponding T1/T2 is also changeless.Also a kind of situation is
When T2 is change, i.e., corresponding T1/T2 is also change.It is variable that the cycle sampled is a kind of, and one kind is changeless.
It may also be said that sample frequency can be fixed frequency or variable frequency.
It should be noted that due to the difference of each CT machines producer, the X-ray bulb time L used that rotates a circle is also
Different, for example there are 0.5s, also 1s or 2s, do not limit L concrete numerical value, Ke Yigen in the embodiment of the present invention specifically
Chosen according to being actually needed.
It is understood that N is also to choose according to the actual requirements, for example, it can choose 20,40,50 etc..
Because X-ray bulb is to export X-ray always when CT machines are scanned in the prior art, in the time that X-ray bulb rotates a circle,
The number of times of acquisition scans data is up to more than 1000 times.And control X-ray interval to send in the embodiment of the present invention, it is not always
In output, therefore, only when in the T1 periods that X-ray is exported, the collection of data is just scanned.So X-ray bulb revolves
The number of times of collection of circling will be far below number of times of the prior art.
S302：Detector gathers the scan data of X-ray within each T1 periods, and the scan data is entered
Row processing obtains CT scan image.
Because the sampling number of the method for the present embodiment offer is seldom, accordingly, it would be desirable to utilize limited view iterative algorithm pair
Scan data is handled.
In summary, the method that the present embodiment is provided, when being scanned due to CT machines, X-ray is not to export always, but
In each period T2, only there is control X-ray in X-ray output, other times to close in the T1 times, therefore greatly reduce CT
The dosage of machine scanning, can so reduce patient by the dose of radiation scanned.And limited view iterative algorithm can be used
Scan data is handled, i.e., complete CT scan image still can be obtained using few gathered data.
Embodiment of the method two：
First, in order to which those skilled in the art more fully understand and implement the technical scheme that the present invention is provided, first tie below
Close accompanying drawing and introduce CT machine scanning theories.
Referring to Fig. 4, the figure is the X-ray bulb of the invention provided with the primary X-ray in rotary frame rotary course
Scan corresponding scan data sampling.
High voltage system provides X-ray tube filament certain heater current, and in cathode filament and rotary anode
Between apply certain voltage, produce the X-ray of fladellum, X-ray scanning scanned object passes through detector and receives scanning number
According to.
Referring to Fig. 5, the sparse gathered data schematic diagram that the figure provides for the present invention.
As shown in figure 5, rotary frame is in rotary course, X-ray bulb is not to send X-ray always, but interval
Sending, the A points in figure open the X-ray T1 periods, closing X-ray between A points and B points in the remaining period, similarly,
X-ray is opened again in B points, and X-ray is opened again in C points.Always according to such regular intervals either on or off X-ray.For example,
Rotary frame rotation is turned around 40 projections of collection in the range of 360 degree, then in the range of each 9 degree, X-ray is sent once, progress one
X-ray is closed between secondary sampling, double sampling.
Only when X-ray is opened, detector is just scanned the collection of data.
Referring to Fig. 6, the flow chart of embodiment of the method two that the figure provides for the present invention.
S601：In each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods, is specially：
High-voltage deflection device is controlled to change grid voltage by pulse signal, the cycle of the pulse signal is T2, duty
ThanThe grid voltage is used to open in the T1 periods and maintain the X-ray, in the remaining time in T2 cycles
The X-ray is closed in section.
It should be noted that the span of dutycycle can be 0.1-0.25；So it is applied to image quality requirements
Positioning scanning in relatively low scanning, such as perfusion scanning；
In addition, the span of the dutycycle in the present invention can also be 0.25-0.5, so it is applied to picture quality
It is required that higher diagnostic scanning.
The T2 is fixed either change, and the T1 is changeless；
It is understood that when T2 is fixed, i.e., it is correspondingIt is also changeless.Also a kind of situation
Be T2 be change when, i.e., it is correspondingIt is also change.The cycle sampled is a kind of be it is variable, one kind be it is fixed not
Become.It may also be said that sample frequency can be fixed frequency or variable frequency.
The timing diagram of pulse signal is shown in Figure 7, in T2 cycle, and high level duration is T1.
S602：The processing acquisition CT scan image that carried out to the scan data is especially by limited view iterative algorithm
CT scan image is obtained, including：
Initial pictures are obtained by algebraically iterative reconstruction algorithm, recycle steepest descent method to seek image poor (Total comprehensively
Variation) optimal solution, obtains detailed image；The limited view iterative algorithm includes the algebraically iterative reconstruction algorithm
With the steepest descent method.
Continue so that 40 projections of collection are turned around in rotary frame rotation as an example, obtaining data for projection collection is：Pi (i=1,2 ...,
40)；
Img=R (P)；
Wherein, R represents limited view iterative algorithm, it is possible to use the data of as little as 20 projection angles produce high-quality
CT images.
X-ray bulb is controlled to send or close X-ray by high-voltage deflection device, it is dilute in rotary frame rotary course
Dredge acquired projections data.A circle scan data is rebuild when traditional CT machine is scanned to be needed to obtain projection numbers more than 1000 angles
According to, and the method that the present invention is provided need to only obtain the data for projection under as little as 20 angles, and X-ray is closed under other angles,
The amount of radiation for the scanning dose that scanned object is subject to can so be reduced.
The CT low-dose scanning methods provided based on above example, are set present invention also offers a kind of CT low-dose scannings
It is standby, it is described in detail below in conjunction with the accompanying drawings.
Apparatus embodiments one：
Referring to Fig. 8, the schematic diagram of CT low-dose scannings apparatus embodiments one that the figure provides for the present invention.
The CT low-dose scanning equipment that the present embodiment is provided, including：Control module 10, acquisition module 20 and computing module
30；
The control module 10, in each period T2, control X-ray bulb output X-ray simultaneously to continue the T1 times
Section；The T1 is less than the T2；The X-ray bulb rotates a circle the time used for L, the X-ray within the L times
The number of times of bulb output X-ray is n times；The T2 is fixed either change, and the T1 is changeless；
It is understood that when T2 is fixed, i.e., corresponding T1/T2 is also changeless.Also a kind of situation is
When T2 is change, i.e., corresponding T1/T2 is also change.It is variable that the cycle sampled is a kind of, and one kind is changeless.
It may also be said that sample frequency can be fixed frequency or variable frequency.
It should be noted that due to the difference of each CT machines producer, the X-ray bulb time L used that rotates a circle is also
Different, for example there are 0.5s, also 1s or 2s, do not limit L concrete numerical value, Ke Yigen in the embodiment of the present invention specifically
Chosen according to being actually needed.
It is understood that N is also to choose according to the actual requirements, for example, it can choose 20,40,50 etc..
Because X-ray bulb is to export X-ray always when CT machines are scanned in the prior art, in the time that X-ray bulb rotates a circle,
The number of times of acquisition scans data is up to more than 1000 times.And control X-ray interval to send in the embodiment of the present invention, it is not always
In output, therefore, only when in the T1 periods that X-ray is exported, the collection of data is just scanned.So X-ray bulb revolves
The number of times of collection of circling will be far below number of times of the prior art.
The acquisition module 20, the data for projection of X-ray is gathered for detector within each T1 periods；
The computing module 30, CT scan image is obtained for carrying out processing to the scan data.
Because the sampling number of the method for the present embodiment offer is seldom, accordingly, it would be desirable to utilize limited view iterative algorithm pair
Scan data is handled.
In summary, the method that the present embodiment is provided, when being scanned due to CT machines, X-ray is not to export always, but
In each period T2, only there is control X-ray in X-ray output, other times to close in the T1 times, therefore greatly reduce CT
The dosage of machine scanning, can so reduce patient by the dose of radiation scanned.And limited view iterative algorithm can be used
Scan data is handled, i.e., complete CT scan image still can be obtained using few gathered data.
Apparatus embodiments two：
Referring to Fig. 9, the schematic diagram of CT low-dose scannings apparatus embodiments two that the figure provides for the present invention.
In the present embodiment, the control module includes control submodule 10a；
The control submodule 10a, controls high-voltage deflection device to change grid voltage by pulse signal；The pulse letter
Number cycle be T2, dutycycleThe grid voltage is used to open in the T1 periods and maintain the X-ray,
The X-ray is closed in the remaining period in T2 cycles.
The T2 is fixed either change, and the T1 is changeless；
It should be noted that the span of dutycycle can be 0.1-0.25；So it is applied to image quality requirements
Positioning scanning in relatively low scanning, such as perfusion scanning；
In addition, the span of the dutycycle in the present invention can also be 0.25-0.5, so it is applied to picture quality
It is required that higher diagnostic scanning.
It is understood that when T2 is fixed, i.e., it is correspondingIt is also changeless.Also a kind of situation is
It is when T2 is change, i.e., correspondingIt is also change.It is variable that the cycle sampled is a kind of, and one kind is to immobilize
's.It may also be said that sample frequency can be fixed frequency or variable frequency.
The computing module 30 obtains CT scan image especially by limited view iterative algorithm, including：First calculates son
Module 30a and the second calculating sub module 30b；
The first calculating sub module 30a, for obtaining initial pictures by algebraically iterative reconstruction algorithm；
The second calculating sub module 30b, for being demanded perfection using steepest descent method to the initial pictures the poor optimal solution in face,
Obtain detailed image.
So that 40 projections of collection are turned around in rotary frame rotation as an example, obtaining data for projection collection is：Pi (i=1,2 ..., 40)；
Img=R (P)；
Wherein, R represents limited view iterative algorithm, it is possible to use the data of as little as 20 projection angles produce high-quality
CT images.
X-ray bulb is controlled to send or close X-ray by high-voltage deflection device, it is dilute in rotary frame rotary course
Dredge acquired projections data.A circle scan data is rebuild when traditional CT machine is scanned to be needed to obtain projection numbers more than 1000 angles
According to, and the method that the present invention is provided need to only obtain the data for projection under as little as 20 angles, and X-ray is closed under other angles,
The amount of radiation for the scanning dose that scanned object is subject to can so be reduced.
The CT low-dose scanning method and apparatus provided based on above example, present invention also offers a kind of CT low dosages
Scanning system, is described in detail below in conjunction with the accompanying drawings.
System embodiment one：
Referring to Figure 10, the schematic diagram of CT low-dose scannings system embodiment one that the figure provides for the present invention.
CT low-dose scannings system provided in an embodiment of the present invention, including：X-ray bulb 100, detector 200 and control
Device 300；
The X-ray bulb 100 includes：Rotary anode, cathode filament, high-voltage deflection device；
The high-voltage deflection device is to applying grid voltage, the cathode filament transmitting output electronics on the cathode filament
Beam impacts the rotary anode, produces X-ray；
The X-ray radiation receives scan data on scanned object by the detector 200；
The high-voltage deflection device is in each period T2, by controlling grid voltage X-ray bulb is exported X-ray simultaneously
Continue the T1 periods；The T1 is less than the T2；The X-ray bulb rotates a circle the time used for L, in the L times
The number of times of the interior X-ray bulb output X-ray is n times；The T2 is fixed either change, and the T1 is to fix not
Become；
It is understood that when T2 is fixed, i.e., corresponding T1/T2 is also changeless.Also a kind of situation is
When T2 is change, i.e., corresponding T1/T2 is also change.It is variable that the cycle sampled is a kind of, and one kind is changeless.
It may also be said that sample frequency can be fixed frequency or variable frequency.
It should be noted that due to the difference of each CT machines producer, the X-ray bulb time L used that rotates a circle is also
Different, for example there are 0.5s, also 1s or 2s, do not limit L concrete numerical value, Ke Yigen in the embodiment of the present invention specifically
Chosen according to being actually needed.
It is understood that N is also to choose according to the actual requirements, for example, it can choose 20,40,50 etc..
Because X-ray bulb is to export X-ray always when CT machines are scanned in the prior art, in the time that X-ray bulb rotates a circle,
The number of times of acquisition scans data is up to more than 1000 times.And control X-ray interval to send in the embodiment of the present invention, it is not always
In output, therefore, only when in the T1 periods that X-ray is exported, the collection of data is just scanned.So X-ray bulb revolves
The number of times of collection of circling will be far below number of times of the prior art.
The controller 300, CT scan image is obtained for carrying out processing to the scan data.
Because the sampling number of the method for the present embodiment offer is seldom, accordingly, it would be desirable to utilize limited view iterative algorithm pair
Scan data is handled.
In summary, the method that the present embodiment is provided, when being scanned due to CT machines, X-ray is not to export always, but
In each period T2, only there is control X-ray in X-ray output, other times to close in the T1 times, therefore greatly reduce CT
The dosage of machine scanning, can so reduce patient by the dose of radiation scanned.And limited view iterative algorithm can be used
Scan data is handled, i.e., complete CT scan image still can be obtained using few gathered data.
It should be noted that controlling high-voltage deflection device to change grid voltage by pulse signal；The pulse signal
Cycle is T2, dutycycleThe grid voltage was used to open in the T1 periods and maintain the X-ray, at T2 weeks
The X-ray is closed in the phase remaining period.
It should be noted that the span of dutycycle can be 0.1-0.25；So it is applied to image quality requirements
Positioning scanning in relatively low scanning, such as perfusion scanning；
In addition, the span of the dutycycle in the present invention can also be 0.25-0.5, so it is applied to picture quality
It is required that higher diagnostic scanning.
The controller 300, is specially to pass through generation first for obtaining CT scan image by limited view iterative algorithm
Number iterative reconstruction algorithm obtains initial pictures, recycles steepest descent method to seek image poor optimal solution comprehensively, obtains detailed image；
The limited view iterative algorithm includes the algebraically iterative reconstruction algorithm and the steepest descent method.
The above described is only a preferred embodiment of the present invention, not making any formal limitation to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and techniques content of the disclosure above to the present invention
Technical scheme makes many possible variations and modification, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent
Change and modify, still fall within technical solution of the present invention protection in the range of.
Claims (7)
1. a kind of CT low-dose scannings method, it is characterised in that including：
In each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods；The T1 is less than the T2；It is described
X-ray bulb rotates a circle the time used for L, and the number of times of the X-ray bulb output X-ray is N within the L times
It is secondary；The T2 is fixed either change, and the T1 is changeless；
Detector gathers the scan data of X-ray within each T1 periods, and scan data progress processing is obtained
Obtain CT scan image；
In each period T2, control X-ray bulb output X-ray simultaneously continues the T1 periods, is specially：
High-voltage deflection device is controlled to change grid voltage by pulse signal, the grid voltage includes the first grid voltage and the
Two grid voltages, first grid voltage and the second grid voltage are negative potential；The cycle of the pulse signal is T2, is accounted for
Sky ratioFirst grid voltage and the second grid voltage are used to open in the T1 periods and maintain the X-ray,
Increase first grid voltage and the second grid voltage within the remaining period in T2 cycles to close the X-ray；It is described
Grid voltage is additionally operable to control focus size and the focus deflection of X-ray.
2. CT low-dose scannings method according to claim 1, it is characterised in that it is described to the scan data at
Reason obtains CT scan image and obtains CT scan image especially by limited view iterative algorithm, including：
Initial pictures are obtained by algebraically iterative reconstruction algorithm, recycles steepest descent method to seek image poor optimal solution comprehensively, obtains
Detailed image；The limited view iterative algorithm includes the algebraically iterative reconstruction algorithm and the steepest descent method.
3. CT low-dose scannings method according to claim 1, it is characterised in that the N is the integer more than or equal to 20.
4. a kind of CT low-dose scannings equipment, it is characterised in that including：Control module, acquisition module and computing module；
The control module, in each period T2, control X-ray bulb output X-ray simultaneously to continue the T1 periods；It is described
T1 is less than the T2；The X-ray bulb rotates a circle the time used for L, and the X-ray bulb is defeated within the L times
The number of times for going out X-ray is n times；The T2 is fixed either change, and the T1 is changeless；
The acquisition module, the scan data of X-ray is gathered for detector within each T1 periods；
The computing module, CT scan image is obtained for carrying out processing to the scan data；
The control module includes control submodule；
The control submodule, controls high-voltage deflection device to change grid voltage by pulse signal, and the grid voltage includes
First grid voltage and the second grid voltage, first grid voltage and the second grid voltage are negative potential；The pulse
The cycle of signal is T2, dutycycleFirst grid voltage and the second grid voltage are used to beat in the T1 periods
Open and maintain the X-ray, increase within the remaining period in T2 cycles first grid voltage and the second grid voltage with
Close the X-ray；The grid voltage is additionally operable to control focus size and the focus deflection of X-ray.
5. CT low-dose scannings equipment according to claim 4, it is characterised in that the computing module is especially by limited
View iterative algorithm obtains CT scan image, including：First calculating sub module and the second calculating sub module；
First calculating sub module, for obtaining initial pictures by algebraically iterative reconstruction algorithm；
Second calculating sub module, for being demanded perfection using steepest descent method to the initial pictures the poor optimal solution in face, obtains detailed
Thin image.
6. a kind of CT low-dose scannings system, it is characterised in that including：X-ray bulb, detector and controller；
The X-ray bulb includes：Rotary anode, cathode filament, high-voltage deflection device；
The high-voltage deflection device is hit to grid voltage, the cathode filament transmitting output electron beam is applied on the cathode filament
The rotary anode is beaten, X-ray is produced；
The X-ray radiation receives scan data on scanned object by the detector；
The high-voltage deflection device is in each period T2, by controlling grid voltage X-ray bulb is exported X-ray and is continued
The T1 periods；The T1 is less than the T2；The X-ray bulb rotates a circle the time used for L, the institute within the L times
The number of times for stating X-ray bulb output X-ray is n times；The T2 is fixed either change, and the T1 is to immobilize
's；
The controller, CT scan image is obtained for carrying out processing to the scan data；
High-voltage deflection device is controlled to change grid voltage by pulse signal, the grid voltage includes the first grid voltage and the
Two grid voltages, first grid voltage and the second grid voltage are negative potential；The cycle of the pulse signal is T2, is accounted for
Sky ratioFirst grid voltage and the second grid voltage are used to open in the T1 periods and maintain the X-ray,
Increase first grid voltage and the second grid voltage within the remaining period in T2 cycles to close the X-ray；It is described
Grid voltage is additionally operable to control focus size and the focus deflection of X-ray.
7. CT low-dose scannings system according to claim 6, it is characterised in that the controller, for by limited
View iterative algorithm obtains CT scan image, is specially to obtain initial pictures by algebraically iterative reconstruction algorithm first, recycles
Steepest descent method seeks image poor optimal solution comprehensively, obtains detailed image；The limited view iterative algorithm includes the algebraically
Iterative reconstruction algorithm and the steepest descent method.
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