CN104586420A - CT low-dose scanning method, device and system - Google Patents
CT low-dose scanning method, device and system Download PDFInfo
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Abstract
The invention provides a CT low-dose scanning method, device and system. An X-ray ball tube is controlled to output X-rays for the time quantum T1at every time quantum T2, T1 is smaller than T2, the time for the X-ray ball tube to rotate by one circle is L, the number of times of outputting the X-rays through the X-ray ball tube within L is N, T2 is constant or changeable, T1 is constant, a detector collects scanning data of the X-rays in every time quantum T1, the scanning data are processed, and a CT scanning image is obtained. When a CT machine carries out scanning, the X-rays are not output all the time, the X-rays are output only in the time quantum T1 in very time quantum T2, the X-rays are controlled not to be output in other time, the scanning dose of the CT machine is greatly reduced, and therefore the scanning radiation dose subjected by a patient can be reduced. Meanwhile, a limited view iterative algorithm can be utilized for processing the scanning data, and in other words, the integral CT scanning image can be still obtained through few collecting data.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly a kind of CT low-dose scanning method, equipment and system.
Background technology
First device-the X-ray tube of the X-ray for generation of CT scan is introduced, see Fig. 1.
Under the dual function of electromagnetic stator and rotor, tungsten anode rotates, i.e. rotating anode.Certainly, back shaft is also had to fix rotating anode.
Heater chain provides certain heater current (Filament Current) to filament (cathode filament), and applies certain voltage between tungsten anode and filament, thus produces tube current, i.e. unwrapping wire electric current.Wherein, the voltage of applying determines the intensity of X-ray, and heater current directly determines the size of unwrapping wire electric current.
In prior art, X-ray is sent by X-ray bulb.
The X-ray of fladellum launched by X-ray bulb, and the x-ray bombardment of fladellum is on scanned object, and then detector detects the scan-data of X-ray.Detector, by the data of the X-ray of detection, carries out imaging processing to these data, thus judges the focus on scanned object.
But this CT scan of the prior art, be that X-ray bulb rotates along with gantry does circumference, in rotary course, X-ray bulb sends X-ray, rotates a circle, and detector needs thousands of scan-datas always.Like this, because scanning dose is very large, the radiation produced scanned object is very high.
Therefore, those skilled in the art need to provide a kind of CT scan method, can reduce the radiation to scanning object.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of CT low-dose scanning method and apparatus, can reduce the radiation of X-ray to scanned object.
The embodiment of the present invention provides a kind of CT low-dose scanning method, comprising:
At each time period T2, control X-ray bulb and export X-ray and continue the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Detector gathers the scan-data of X-ray within each described T1 time period, and carries out process acquisition CT scan image to described scan-data.
Preferably, at each time period T2, control X-ray bulb and export X-ray and continue the T1 time period, be specially:
Control high-voltage deflection device by pulse signal and change grid voltage, the cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
Preferably, describedly process is carried out to described scan-data obtain CT scan image and obtain CT scan image especially by limited view iterative algorithm, comprising:
Obtain initial pictures by algebraically iterative reconstruction algorithm, recycling steepest descent method asks the comprehensive poor optimal solution of image, obtains detailed image; Described limited view iterative algorithm comprises described algebraically iterative reconstruction algorithm and described steepest descent method.
Preferably, described N is more than or equal to the integer of 20.
The embodiment of the present invention provides a kind of CT low-dose scanning equipment, comprising: control module, acquisition module and computing module;
Described control module, at each time period T2, controls X-ray bulb and exports X-ray and continue the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Described acquisition module, gathers the data for projection of X-ray within each described T1 time period for detector;
Described computing module, obtains CT scan image for carrying out process to described scan-data.
Preferably, described control module comprises control submodule;
Described control submodule, controls high-voltage deflection device by pulse signal and changes grid voltage; The cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
Preferably, described computing module obtains CT scan image especially by limited view iterative algorithm, comprising: the first calculating sub module and the second calculating sub module;
Described first calculating sub module, for obtaining initial pictures by algebraically iterative reconstruction algorithm;
Described second calculating sub module, for utilizing steepest descent method to differ from optimal solution to described initial pictures face of demanding perfection, obtains detailed image.
The embodiment of the present invention also provides a kind of CT low-dose scanning system, comprising: X-ray bulb, detector and controller;
Described X-ray bulb comprises: rotating anode, cathode filament, high-voltage deflection device;
Described high-voltage deflection device applies grid voltage on described cathode filament, and described cathode filament is launched output electron beam and impacted described rotating anode, produces X-ray;
Described X-radiation, on scanned object, receives scan-data by described detector;
Described high-voltage deflection device, at each time period T2, makes X-ray bulb export X-ray by controlling grid voltage and continues the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Described controller, obtains CT scan image for carrying out process to described scan-data.
Preferably, control high-voltage deflection device by pulse signal and change grid voltage; The cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
Preferably, described controller, for obtaining CT scan image by limited view iterative algorithm, being specially and first obtaining initial pictures by algebraically iterative reconstruction algorithm, and recycling steepest descent method asks the comprehensive poor optimal solution of image, obtains detailed image; Described limited view iterative algorithm comprises described algebraically iterative reconstruction algorithm and described steepest descent method.
Compared with prior art, the present invention has the following advantages:
CT low-dose scanning method and apparatus provided by the invention, due to CT machine scan time, X-ray is not exporting always, but in each time period T2, only X-ray is had to export in the T1 time, control X-ray in other times to close, therefore greatly reduce the dosage of CT machine scanning, the radiation dose that patient is scanned can be reduced like this.And limited view iterative algorithm can be adopted to process scan-data, namely utilize few image data still can obtain complete CT scan image.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be 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 of high-voltage deflection device provided by the invention;
Fig. 3 is CT low-dose scanning embodiment of the method one flow chart provided by the invention;
Fig. 4 is that X-ray bulb provided by the invention is along with rotary frame rotary course schematic diagram;
Fig. 5 is sparse image data schematic diagram provided by the invention;
Fig. 6 is CT low-dose scanning embodiment of the method two flow chart provided by the invention;
Fig. 7 is pulse signal sequential chart provided by the invention;
Fig. 8 is CT low-dose scanning apparatus embodiments one schematic diagram provided by the invention;
Fig. 9 is CT low-dose scanning apparatus embodiments two schematic diagram provided by the invention;
Figure 10 is CT low-dose scanning system embodiment one schematic diagram provided by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
See Fig. 2, this figure is the high-voltage deflection device schematic diagram in heater chain of the prior art.
Grid voltage (Grid Voltage) is applied by high-voltage deflection device, grid voltage can control focus size and the deflection of X-ray, if the first grid voltage and the second grid voltage strengthen negative potential jointly, then the electron beam that cathode filament sends can narrow because of being subject to " extruding ".When the first grid voltage and the second grid voltage are increased to 5000V, X-ray can be closed.
Embodiment of the method one:
See Fig. 3, this figure is CT low-dose scanning embodiment of the method one flow chart provided by the invention.
The CT low-dose scanning method that the present embodiment provides, comprising:
S301: at each time period T2, controls X-ray bulb and exports X-ray and continue the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time.Described T2 is fixing or change, and described T1 is changeless;
Be understandable that, when T2 is fixing, namely corresponding T1/T2 is also changeless.When also having a kind of situation to be T2 be change, namely corresponding T1/T2 is also change.The cycle of namely sampling is a kind of is variable, and one is changeless.Alternatively, sample frequency can be fixed frequency, also can be variable frequency.
It should be noted that, due to the difference of each CT machine producer, the time L that X-ray bulb rotates a circle used is also different, such as have 0.5s's, also have 1s or 2s, specifically do not limit the concrete numerical value of L in the embodiment of the present invention, can choose according to actual needs.
Be understandable that, N also can choose according to the actual requirements, such as, can choose 20,40,50 etc.Because X-ray bulb in prior art exports X-ray when CT machine scans always, 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 in the embodiment of the present invention and send, be not exporting always, therefore, only have when in the T1 time period that X-ray exports, just carry out the collection of scan-data.Such X-ray bulb rotates a circle the number of times gathered will far below number of times of the prior art.
S302: detector gathers the scan-data of X-ray within each described T1 time period, and process acquisition CT scan image is carried out to described scan-data.
The sampling number of the method provided due to the present embodiment is little, therefore, needs to utilize limited view iterative algorithm to process scan-data.
In sum, the method that the present embodiment provides, due to CT machine scan time, X-ray is not exporting always, but in each time period T2, only have X-ray to export in the T1 time, control X-ray in other times and close, therefore greatly reduce the dosage of CT machine scanning, the radiation dose that patient is scanned can be reduced like this.And limited view iterative algorithm can be adopted to process scan-data, namely utilize few image data still can obtain complete CT scan image.
Embodiment of the method two:
First, understand better in order to those skilled in the art and implement technical scheme provided by the invention, below first introduce CT machine scanning theory by reference to the accompanying drawings.
See Fig. 4, this figure is the scan-data sampling of X-ray bulb provided by the invention along with the primary X-ray scanning correspondence in rotary frame rotary course.
High voltage system provides certain heater current to X-ray tube filament, and between cathode filament and rotating anode, apply certain voltage, and produce the X-ray of fladellum, X-ray scanning scanned object, receives scan-data by detector.
See Fig. 5, this figure is sparse image data schematic diagram provided by the invention.
As shown in Figure 5, rotary frame is in rotary course, X-ray bulb is not send X-ray always, but to be interposed between and to send, A point in the drawings opens the X-ray T1 time period, closes X-ray, in like manner in the time period remaining between A point and B point, open X-ray again at B point, open X-ray again at C point.Open closedown X-ray according to such regular intervals always.Such as, revolve to turn around within the scope of 360 degree gather 40 projections at rotary frame, then, within the scope of each 9 degree, X-ray sends once, once samples, and closes X-ray between double sampling.
Only have when X-ray is opened, detector just carries out the collection of scan-data.
See Fig. 6, this figure is embodiment of the method two flow chart provided by the invention.
S601: at each time period T2, controls X-ray bulb and exports X-ray and continue the T1 time period, be specially:
Control high-voltage deflection device by pulse signal and change grid voltage, the cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
It should be noted that, the span of dutycycle can be 0.1-0.25; Be applicable to the scanning lower to image quality requirements like this, as the location scanning in perfusion scanning;
In addition, the span of the dutycycle in the present invention can also be 0.25-0.5, is applicable to the diagnostic scanning higher to image quality requirements like this.
Described T2 is fixing or change, and described T1 is changeless;
Be understandable that, when T2 is fixing, namely corresponding
also be changeless.When also having a kind of situation to be T2 be change, namely corresponding
also be change.The cycle of namely sampling is a kind of is variable, and one is changeless.Alternatively, sample frequency can be fixed frequency, also can be variable frequency.
The sequential chart of pulse signal is shown in Figure 7, and in the cycle of T2, the time period that high level continues is T1.
S602: describedly carry out process to described scan-data and obtain CT scan image and obtain CT scan image especially by limited view iterative algorithm, comprising:
Obtain initial pictures by algebraically iterative reconstruction algorithm, recycling steepest descent method asks image poor (Total Variation) optimal solution comprehensively, obtains detailed image; Described limited view iterative algorithm comprises described algebraically iterative reconstruction algorithm and described steepest descent method.
Continue to revolve with rotary frame collection 40 of turning around and be projected as example, obtaining projected dataset is: Pi (i=1,2 ..., 40);
Img＝R(P)；
Wherein, R represents limited view iterative algorithm, and few data to 20 projection angles can be utilized to produce high-quality CT image.
Control X-ray bulb by high-voltage deflection device send or close X-ray, sparse recording projection data in rotary frame rotary course.The data for projection that a circle scan-data needs more than acquisition 1000 angles is rebuild during the scanning of traditional CT machine, and method provided by the invention only need obtain few to the data for projection under 20 angles, under other angles, close X-ray, the amount of radiation of the scanning dose that scanned object is subject to can be reduced like this.
Based on the CT low-dose scanning method that above embodiment provides, present invention also offers a kind of CT low-dose scanning equipment, be described in detail below in conjunction with accompanying drawing.
Apparatus embodiments one:
See Fig. 8, this figure is CT low-dose scanning apparatus embodiments one schematic diagram provided by the invention.
The CT low-dose scanning equipment that the present embodiment provides, comprising: control module 10, acquisition module 20 and computing module 30;
Described control module 10, at each time period T2, controls X-ray bulb and exports X-ray and continue the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Be understandable that, when T2 is fixing, namely corresponding T1/T2 is also changeless.When also having a kind of situation to be T2 be change, namely corresponding T1/T2 is also change.The cycle of namely sampling is a kind of is variable, and one is changeless.Alternatively, sample frequency can be fixed frequency, also can be variable frequency.
It should be noted that, due to the difference of each CT machine producer, the time L that X-ray bulb rotates a circle used is also different, such as have 0.5s's, also have 1s or 2s, specifically do not limit the concrete numerical value of L in the embodiment of the present invention, can choose according to actual needs.
Be understandable that, N also can choose according to the actual requirements, such as, can choose 20,40,50 etc.Because X-ray bulb in prior art exports X-ray when CT machine scans always, 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 in the embodiment of the present invention and send, be not exporting always, therefore, only have when in the T1 time period that X-ray exports, just carry out the collection of scan-data.Such X-ray bulb rotates a circle the number of times gathered will far below number of times of the prior art.
Described acquisition module 20, gathers the data for projection of X-ray within each described T1 time period for detector;
Described computing module 30, obtains CT scan image for carrying out process to described scan-data.
The sampling number of the method provided due to the present embodiment is little, therefore, needs to utilize limited view iterative algorithm to process scan-data.
In sum, the method that the present embodiment provides, due to CT machine scan time, X-ray is not exporting always, but in each time period T2, only have X-ray to export in the T1 time, control X-ray in other times and close, therefore greatly reduce the dosage of CT machine scanning, the radiation dose that patient is scanned can be reduced like this.And limited view iterative algorithm can be adopted to process scan-data, namely utilize few image data still can obtain complete CT scan image.
Apparatus embodiments two:
See Fig. 9, this figure is CT low-dose scanning apparatus embodiments two schematic diagram provided by the invention.
In the present embodiment, described control module comprises control submodule 10a;
Described control submodule 10a, controls high-voltage deflection device by pulse signal and changes grid voltage; The cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
Described T2 is fixing or change, and described T1 is changeless;
It should be noted that, the span of dutycycle can be 0.1-0.25; Be applicable to the scanning lower to image quality requirements like this, as the location scanning in perfusion scanning;
In addition, the span of the dutycycle in the present invention can also be 0.25-0.5, is applicable to the diagnostic scanning higher to image quality requirements like this.
Be understandable that, when T2 is fixing, namely corresponding
also be changeless.When also having a kind of situation to be T2 be change, namely corresponding
also be change.The cycle of namely sampling is a kind of is variable, and one is changeless.Alternatively, sample frequency can be fixed frequency, also can be variable frequency.
Described computing module 30 obtains CT scan image especially by limited view iterative algorithm, comprising: the first calculating sub module 30a and the second calculating sub module 30b;
Described first calculating sub module 30a, for obtaining initial pictures by algebraically iterative reconstruction algorithm;
Described second calculating sub module 30b, for utilizing steepest descent method to differ from optimal solution to described initial pictures face of demanding perfection, obtains detailed image.
Revolve with rotary frame collection 40 of turning around and be projected as example, obtaining projected dataset is: Pi (i=1,2 ..., 40);
Img＝R(P)；
Wherein, R represents limited view iterative algorithm, and few data to 20 projection angles can be utilized to produce high-quality CT image.
Control X-ray bulb by high-voltage deflection device send or close X-ray, sparse recording projection data in rotary frame rotary course.The data for projection that a circle scan-data needs more than acquisition 1000 angles is rebuild during the scanning of traditional CT machine, and method provided by the invention only need obtain few to the data for projection under 20 angles, under other angles, close X-ray, the amount of radiation of the scanning dose that scanned object is subject to can be reduced like this.
Based on the CT low-dose scanning method and apparatus that above embodiment provides, present invention also offers a kind of CT low-dose scanning system, be described in detail below in conjunction with accompanying drawing.
System embodiment one:
See Figure 10, this figure is CT low-dose scanning system embodiment one schematic diagram provided by the invention.
The CT low-dose scanning system that the embodiment of the present invention provides, comprising: X-ray bulb 100, detector 200 and controller 300;
Described X-ray bulb 100 comprises: rotating anode, cathode filament, high-voltage deflection device;
Described high-voltage deflection device applies grid voltage on described cathode filament, and described cathode filament is launched output electron beam and impacted described rotating anode, produces X-ray;
Described X-radiation, on scanned object, receives scan-data by described detector 200;
Described high-voltage deflection device, at each time period T2, makes X-ray bulb export X-ray by controlling grid voltage and continues the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Be understandable that, when T2 is fixing, namely corresponding T1/T2 is also changeless.When also having a kind of situation to be T2 be change, namely corresponding T1/T2 is also change.The cycle of namely sampling is a kind of is variable, and one is changeless.Alternatively, sample frequency can be fixed frequency, also can be variable frequency.
It should be noted that, due to the difference of each CT machine producer, the time L that X-ray bulb rotates a circle used is also different, such as have 0.5s's, also have 1s or 2s, specifically do not limit the concrete numerical value of L in the embodiment of the present invention, can choose according to actual needs.
Be understandable that, N also can choose according to the actual requirements, such as, can choose 20,40,50 etc.Because X-ray bulb in prior art exports X-ray when CT machine scans always, 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 in the embodiment of the present invention and send, be not exporting always, therefore, only have when in the T1 time period that X-ray exports, just carry out the collection of scan-data.Such X-ray bulb rotates a circle the number of times gathered will far below number of times of the prior art.
Described controller 300, obtains CT scan image for carrying out process to described scan-data.
The sampling number of the method provided due to the present embodiment is little, therefore, needs to utilize limited view iterative algorithm to process scan-data.
In sum, the method that the present embodiment provides, due to CT machine scan time, X-ray is not exporting always, but in each time period T2, only have X-ray to export in the T1 time, control X-ray in other times and close, therefore greatly reduce the dosage of CT machine scanning, the radiation dose that patient is scanned can be reduced like this.And limited view iterative algorithm can be adopted to process scan-data, namely utilize few image data still can obtain complete CT scan image.
It should be noted that, control high-voltage deflection device by pulse signal and change grid voltage; The cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
It should be noted that, the span of dutycycle can be 0.1-0.25; Be applicable to the scanning lower to image quality requirements like this, as the location scanning in perfusion scanning;
In addition, the span of the dutycycle in the present invention can also be 0.25-0.5, is applicable to the diagnostic scanning higher to image quality requirements like this.
Described controller 300, for obtaining CT scan image by limited view iterative algorithm, being specially and first obtaining initial pictures by algebraically iterative reconstruction algorithm, and recycling steepest descent method asks the comprehensive poor optimal solution of image, obtains detailed image; Described limited view iterative algorithm comprises described algebraically iterative reconstruction algorithm and described steepest descent method.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. a CT low-dose scanning method, is characterized in that, comprising:
At each time period T2, control X-ray bulb and export X-ray and continue the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Detector gathers the scan-data of X-ray within each described T1 time period, and carries out process acquisition CT scan image to described scan-data.
2. CT low-dose scanning method according to claim 1, is characterized in that, at each time period T2, controls X-ray bulb and exports X-ray and continue the T1 time period, be specially:
Control high-voltage deflection device by pulse signal and change grid voltage, the cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
3. CT low-dose scanning method according to claim 1 and 2, is characterized in that, describedly carries out process to described scan-data and obtains CT scan image and obtain CT scan image especially by limited view iterative algorithm, comprising:
Obtain initial pictures by algebraically iterative reconstruction algorithm, recycling steepest descent method asks the comprehensive poor optimal solution of image, obtains detailed image; Described limited view iterative algorithm comprises described algebraically iterative reconstruction algorithm and described steepest descent method.
4. CT low-dose scanning method according to claim 1, it is characterized in that, described N is more than or equal to the integer of 20.
5. a CT low-dose scanning equipment, is characterized in that, comprising: control module, acquisition module and computing module;
Described control module, at each time period T2, controls X-ray bulb and exports X-ray and continue the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Described acquisition module, gathers the data for projection of X-ray within each described T1 time period for detector;
Described computing module, obtains CT scan image for carrying out process to described scan-data.
6. CT low-dose scanning equipment according to claim 5, it is characterized in that, described control module comprises control submodule;
Described control submodule, controls high-voltage deflection device by pulse signal and changes grid voltage; The cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
7. the CT low-dose scanning equipment according to claim 5 or 6, is characterized in that, described computing module obtains CT scan image especially by limited view iterative algorithm, comprising: the first calculating sub module and the second calculating sub module;
Described first calculating sub module, for obtaining initial pictures by algebraically iterative reconstruction algorithm;
Described second calculating sub module, for utilizing steepest descent method to differ from optimal solution to described initial pictures face of demanding perfection, obtains detailed image.
8. a CT low-dose scanning system, is characterized in that, comprising: X-ray bulb, detector and controller;
Described X-ray bulb comprises: rotating anode, cathode filament, high-voltage deflection device;
Described high-voltage deflection device applies grid voltage on described cathode filament, and described cathode filament is launched output electron beam and impacted described rotating anode, produces X-ray;
Described X-radiation, on scanned object, receives scan-data by described detector;
Described high-voltage deflection device, at each time period T2, makes X-ray bulb export X-ray by controlling grid voltage and continues the T1 time period; Described T1 is less than described T2; Described X-ray bulb time used that rotates a circle is L, and within the described L time, described X-ray bulb exports the number of times of X-ray is N time; Described T2 is fixing or change, and described T1 is changeless;
Described controller, obtains CT scan image for carrying out process to described scan-data.
9. CT low-dose scanning system according to claim 8, is characterized in that, controls high-voltage deflection device change grid voltage by pulse signal; The cycle of described pulse signal is T2, dutycycle
described grid voltage is used for opening when the T1 time period and maintaining described X-ray, closes described X-ray within the time period of T2 cycle remainder.
10. CT low-dose scanning system according to claim 8 or claim 9, it is characterized in that, described controller, for obtaining CT scan image by limited view iterative algorithm, be specially and first obtain initial pictures by algebraically iterative reconstruction algorithm, recycling steepest descent method asks the comprehensive poor optimal solution of image, obtains detailed image; Described limited view iterative algorithm comprises described algebraically iterative reconstruction algorithm and described steepest descent method.
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Address after: 110179 No. 177-1 Innovation Road, Hunnan District, Shenyang City, Liaoning Province Patentee after: DongSoft Medical System Co., Ltd. Address before: Hunnan New Century Road 110179 Shenyang city of Liaoning Province, No. 16 Patentee before: Dongruan Medical Systems Co., Ltd., Shenyang |