CN203083952U - CT (computed tomography) equipment - Google Patents
CT (computed tomography) equipment Download PDFInfo
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- CN203083952U CN203083952U CN 201320045999 CN201320045999U CN203083952U CN 203083952 U CN203083952 U CN 203083952U CN 201320045999 CN201320045999 CN 201320045999 CN 201320045999 U CN201320045999 U CN 201320045999U CN 203083952 U CN203083952 U CN 203083952U
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Abstract
The utility model discloses CT (computed tomography) equipment. The CT equipment comprises an electron beam generating device, a circular reflection target and a circular detector array, wherein the electron beam generating device comprises an electron gun, deflection scanning devices and a current-limiting device; the electron gun generates electron beams; the deflection scanning devices deflect the electron beams; the deflection directions of the deflection scanning devices change along with time to realize circular scanning; the current-limiting device is provided with a plurality of holes arranged circularly; when the electron beams carry out scanning along the holes arranged circularly, a plurality of electron beams distributed circularly are output; the circular reflection target is coaxially arranged with the electron beams distributed circularly; the electron beams bombard the circular reflection target to generate X rays intersecting with the axes of the electron beams distributed circularly; the circular detector array is coaxially arranged with the circular reflection target and comprises a plurality of detector units; and the X rays enter the corresponding detector units after penetrating through a detected object.
Description
Technical field
Present technique relates to fields such as medical imaging, industrial detection.Can directly apply to the medical application fields that needs the hypervelocity imaging, also can be applicable to industrial application such as Non-Destructive Testing.
Background technology
CT is writing a Chinese character in simplified form of Computed Tomography, and promptly computed tomography is that a kind of computer technology of utilizing is rebuild the scan mode that obtains three-dimensional tomographic image to testee tomoscan image.This scan mode is that the ray by single axial plane penetrates testee, and is different with transmitance to the absorption of ray according to the testee each several part, sees through ray and by the three-dimensionalreconstruction imaging by computer acquisition.The CT that mentions in this patent does not specify and all refers to X ray CT.
CT can be divided into for five generations according to development, the sweep test in preceding four generations is realized (mechanic scanning mode) by mobile x-ray pipe tie detector, wherein in the third generation and the 4th generation, adopted the rotation sweep mode, its sweep test is made up of X-ray tube, detector and scanning support, and X-ray tube and detector are installed on the scanning support.High speed rotating by scanning support during CT work makes X-ray tube send X ray in each position of circumference to sweep object, reverts to the image of the tomography that is scanned after the reception of process detector and the processing of computer system.
The screw type continuous multi-layer scanning computed tomography (MDCT) of development in recent years belongs to the 4th generation CT in essence, its sweep velocity there is no progress than screw type Single Slice Mode CT, but its detector row number increases, thereby X-ray tube rotates a circle and just can obtain multi-layer data.For 64 ripe at present helical layer type continuous multi-layer scanning computed tomographies, rotating a circle needs 0.33s, and its time good resolution is in 50ms (temporal resolution is mainly determined by the scan period, and is also relevant with reconstruction mode with the scanning coverage in multi-Slice CT).
The advantage of the scan mode of above-mentioned the 4th generation CT is the spatial resolution height, and shortcoming is that temporal resolution is low.Limiting its time resolution principal element is its sweep velocity.For present state-of-the-art multi-layer spiral CT, maximum sweep rate also has only 0.33s/ week, this is by the decision of the physical strength limit of scanning support and X-ray tube: when the CT high speed rotating, the linear velocity at X-ray tube place has reached the first cosmic velocity, for guaranteeing the stable of structure, there is the limit in the rotating speed of CT.
The scanning theory of the 5th generation CT (UFCT) is different with preceding four generations, advanced electron beam technology (electron beam technology) is adopted in the generation of X ray, the anode of bulb separates with negative electrode, from the electron gun divergent bundle of negative electrode, through quickening to form high-power electron beam, again by assembling and the magnetic core logical circuit deflection coil, project the anode target surface that is 210 ° of arcs, produce X-ray beam, replace traditional mechanicalness rotation, sweep velocity can reach 50ms/ week.
To sum up, in the imaging of medical field, be representative with the cardiac imaging, use mechanic scanning mode can accomplish that per second finishes tomoscan 2～3 times to same position, use the electron beam scanning pattern can accomplish that per second finishes tomoscan 20 times to same position; In the industrial detection field, carry out the sweep velocity of fault imaging generally in a minute magnitude for large-sized object.
Under the technology path of existing CT imaging device, the approach that improves sweep velocity has three kinds: improve hardware performance 1..As improve mechanical hook-up rotational speed, increase radiogenic quantity etc.; 2. utilize the stability of testee to carry out equivalence scanning.As in cardiac imaging, using gating technology; 3. change scan mode.As electron beam scanning (UFCT).
More than these means can add fast scan speed to a certain extent, but can't further realize hypervelocity scanning, realize fault imaging to high-speed moving object.
Summary of the invention
For overcoming in the above-mentioned CT technology the restriction of sweep velocity (also being time resolution), the purpose of present technique provides a kind of CT equipment of high time resolution.
An aspect according to present technique, a kind of CT equipment is provided, comprise: electron beam generating device, comprise electron gun, deflection scanning device and current-limiting apparatus, its electron gun produces electron beam, described deflection scanning device carries out deflection to described electron beam, yawing moment changes in time, realizes circular scanning, and described current-limiting apparatus has a plurality of holes that are circular layout, when described electron beam during along a plurality of holes scanning that is circular layout, a plurality of electron beams of output annular spread; The annular reflection target, with the coaxial setting of the electron beam of described annular spread, the described annular reflection target of the beam bombardment of wherein said annular spread, the X ray of the axes intersect of the electron beam of generation and annular spread; And the annular detector array, with the coaxial setting of described annular reflection target, comprising a plurality of detector cells, wherein said X ray incides corresponding detector cells after penetrating tested object.
According to other embodiment, described CT equipment also comprises: the resonance accelerating cavity, be configured to work in the TM010 pattern, and receive described electron beam generating device ejected electron bundle, and the electron beam that is received is quickened.
According to other embodiment, described CT equipment also comprises coupling mechanism and microwave power source, and described coupling mechanism quickens the described resonance accelerating cavity of microwave feed-in that described microwave power source produces to described electron beam.
According to other embodiment, described electron beam generating device also comprises driving mechanism, be configured to when described electron beam generating device produces electron beam, drive described current-limiting apparatus and back and forth rotate an angle, described angle is smaller or equal to the angle that circle center line connecting became of hole adjacent on the current-limiting apparatus with described place, a plurality of hole circumference that is circular layout.
According to other embodiment, described CT equipment also comprises circular cowling, is arranged on described annular reflection target front end, has and the corresponding hole of described a plurality of electron beams, limits the bundle spot of described electron beam on the annular reflection target.
According to other embodiment, described CT equipment also comprises the drift joint, is arranged between described resonance accelerating cavity and the described endless metal target, is configured to make described electron beam to carry out horizontal self-focusing.
According to other embodiment, described CT equipment also comprises conveyer, carries the axial-movement of described inspected object along described annular detector array.
According to other embodiment, the target surface normal direction of described annular reflection target is spent greater than 90 with the angle between the electron beam incident direction.
According to other embodiment, described CT equipment also comprises collimating apparatus, and described X ray is collimated.
According to other embodiment, each detector cells of described annular detector array is specially the multi-layer detector unit.
Owing to adopted above-mentioned technology, can be implemented under the prerequisite that guarantees certain spatial resolution, increase substantially CT scan speed.
Description of drawings
Following accompanying drawing has shown the embodiment of present technique.These drawings and embodiments provide some embodiment of present technique in the mode of non-limiting, non exhaustive property, wherein:
Fig. 1 is the general structure synoptic diagram according to the CT equipment of present technique embodiment;
Fig. 2 is the synoptic diagram of describing according to the part of the electric scanning in the CT equipment of other embodiment of present technique;
Fig. 3 shows the synoptic diagram according to the current-limiting apparatus in the CT equipment of present technique embodiment;
Fig. 4 is the decomposing schematic representation according to the electric scanning part of the CT equipment of present technique embodiment;
Fig. 5 is the comprehensive formation synoptic diagram according to the electric scanning part of the CT equipment of present technique embodiment;
Fig. 6 shows the field pattern signal according to coaxial cavity when work in the CT equipment of present technique embodiment;
Fig. 7 shows the movement locus signal according to coaxial cavity when work electron beam in the CT equipment of present technique embodiment;
Fig. 8 shows the structural representation according to endless metal target in the CT equipment of present technique embodiment;
Fig. 9 is the synoptic diagram of description according to the working method of the CT equipment of each embodiment of present technique;
Figure 10 shows according to the coaxial cavity in the CT equipment of present technique embodiment and the structural representation of coupling mechanism;
Figure 11 shows the synoptic diagram that is arranged on the circular cowling before the metallic target in the CT equipment according to present technique embodiment.
Embodiment
To describe the specific embodiment of present technique below in detail, should be noted that the embodiments described herein only is used to illustrate, be not limited to present technique.In the following description, for the thorough to present technique is provided, a large amount of specific detail have been set forth.Yet, it is evident that for those of ordinary skills: needn't adopt these specific detail to carry out present technique.In other examples,, do not specifically describe known structure, material or method for fear of obscuring present technique.
In whole instructions, " embodiment ", " embodiment ", " example " or mentioning of " example " are meaned: special characteristic, structure or characteristic in conjunction with this embodiment or example description are comprised among at least one embodiment of present technique.Therefore, differ to establish a capital in each local phrase " in one embodiment ", " in an embodiment ", " example " or " example " that occurs of whole instructions and refer to same embodiment or example.In addition, can with any suitable combination and/or sub-portfolio with specific feature, structure or property combination in one or more embodiment or example.In addition, it should be understood by one skilled in the art that term used herein " and/or " comprise any and all combinations of one or more relevant projects of listing.
In order further to improve the sweep velocity of CT equipment, the embodiment of present technique has proposed a kind of CT equipment, it comprises electron beam generating device, comprise electron gun, deflection scanning device and current-limiting apparatus, its electron gun produces electron beam, described deflection scanning device carries out deflection to described electron beam, yawing moment becomes in time, realize circular scanning, described current-limiting apparatus has a plurality of holes that are circular layout, when described electron beam during along a plurality of holes scanning that is circular layout, a plurality of electron beams of output annular spread; The annular reflection target, with the coaxial setting of the electron beam of described annular spread, the described annular reflection target of wherein said beam bombardment, the X ray of the axes intersect of the electron beam of generation and annular spread; And the annular detector array, with the coaxial setting of described annular reflection target, comprising a plurality of detector cells, wherein said X ray incides corresponding detector cells after penetrating tested object.
For example, based on coaxial resonator with the frequency microwave power source energy supply of high repetition frequency, the electron beam of the annular spread that use process deflection scanning device and current-limiting apparatus obtain, beat reflecting target through one section drift after quickening in the TM010 field in coaxial resonator, produce the concentric X ray sequence of passing through with the coaxial resonator axis normal.Utilize this X ray sequence that target object is carried out the CT imaging.
In the embodiment that adopts said structure, can be implemented under the prerequisite that guarantees certain spatial resolution, sweep velocity is improved.Simultaneously, regulate the feed-in power of microwave power source, can realize the X ray energy adjustment in the certain limit, the potentiality that produce sigmatron are arranged, can be applied to industrial nondestructive testing.For example, electron beam is quickened, produce the X-ray beam of different-energy, thereby realize multipotency scanning, for example dual energy scan with different feed-in power.
For example, change the feed-in watt level of microwave power source, just can realize the electron beam output of different-energy, the X ray of different-energy output just.Within the specific limits, satisfy between beam energy and the feed-in power:
E∝√P (1)
In following formula, E represents beam energy, and P represents feed-in power.In view of the above, can realize the multipotency of X ray.
Fig. 1 is the general structure synoptic diagram according to the CT equipment of present technique embodiment.As shown in Figure 1, the CT equipment of present technique comprises electric scanner, central control system 1, electron gun control module 2, microwave power source 3, detector control module 4, data processing unit 5 and image reconstruction unit 6 etc.This electric scanner comprises the detector 11 of electron beam generating device, coaxial resonance accelerating cavity 8, metallic target 9 and annular.This electron beam generating device for example comprises electron gun 7 and level and frame deflector coil (deflection scanning device), and current-limiting apparatus.
Electric scanner is a hardware device of realizing the hypervelocity fault imaging, and referring to Fig. 2, showed the general configuration of electric scanner: electron gun 7, its effect are the controlled emissions electronics.
As shown in Figure 2, electron gun 7 produces electron beams, and this electron beam carries out circular scanning (applying for example for horizontal deflection coil and frame deflector coil to differ is 90 ° sinusoidal signal, for example applies sinusoidal signal and cosine signal respectively) under the effect of deflection coil.Fig. 3 shows the synoptic diagram according to the current-limiting apparatus in the CT equipment of present technique.This current-limiting apparatus 16 is installed in the downstream of electron gun 7, and the inflector assembly controlling electron beam is along the path scanning in the hole that the annular on the current-limiting apparatus 16 is provided with.When electron beam scanning arrived certain hole 17, electron beam will partly pass through the hole, formed the electron beam that parallels to the axis.Have several holes though figure 3 illustrates current-limiting apparatus 16, skilled in the art will recognize that more hole can be set.For example, on sheet metal, form up to a hundred the holes that are arranged in annular and be used as current-limiting apparatus.
Coaxial resonance accelerating cavity 8 is operated in the TM010 pattern, is used for vertical accelerated electron and beats metallic target 9 forming X ray.The detector 11 of annular is used to receive the X ray that passes inspected object 10.
The relative position of electric scanner when Fig. 5 has showed work.The current-limiting apparatus 16 that the electron beam that electron gun 7 is produced carries out current limliting is installed on that side away from metallic target 9 of coaxial cavity 8.One section drift joint is arranged to realize the horizontal self-focusing of electron beam between coaxial cavity 8 and the metallic target 9.Certain little gap is arranged between metallic target 9 and the detector 11, install collimating apparatus additional to guarantee image quality.
In the imaging process, referring to Fig. 1, control electron gun 7 divergent bundle I after the startup scan instruction of electron gun control module 2 reception central control systems 1
0(can allow 1～3 electron gun emitting electrons to add fast scan speed) according to electronics acceleration energy and collimating apparatus design synchronization.Electron beam I
0Through coaxial resonance accelerating cavity 8 quicken to reach target energy (can height can be low, by the feed-in power decision of microwave power source 3, low can be to about 100keV, the about 1MeV of Gao Keda), accelerated electron beam I
1Beat the X ray J of metallic target 9 generations and coaxial resonator axes intersect
0, for example roughly with the X ray of coaxial resonator axis normal direction, through penetrating the inspected object 10 that carries on the conveyer that moves along the coaxial resonator parallel axes, the X ray J behind the strength retrogression behind the collimating device collimation between metallic target 9 and the detector 11
1On detector 11, be received.
Control detector 11 image data after the startup scan instruction of detector control module 4 reception central control systems 1, and send it to central control system 1.Central control system rearranges the detector data that collects according to the order of the electron beam that current-limiting apparatus 16 current limlitings obtain, and sends to data processing unit 5 and carry out pre-service.Data processing unit 5 is finished and the standard projection data that calculate is sent to image reconstruction unit 6 after the work such as inconsistent correction, hardening correcting, gamma correction and rebuild, and then obtains the tomographic sequence of testee assigned address.
The acceleration principle of coaxial resonance accelerating cavity 8 in the explained later electric scanner.Obtain power from microwave power source 3 during coaxial cavity work, and in the chamber, set up the field distribution of TM010 mould, referring to Fig. 6.The left side is a left view among Fig. 6, and the right side is a front elevation, and dotted line is magnetic field, and solid line is an electric field.The field distribution feature of this pattern is as follows:
Only there is longitudinal component in electric field, and only there is azimuth component in magnetic field
Longitudinal electric field and poloidal magnetic field are longitudinally even
Longitudinal electric field the strongest near coaxial cavity external diameter and internal diameter mid point near outer radius
The strength of longitudinal electric field magnetic field intensity is 0 (by the decision of resonator cavity characteristic)
By top field distribution characteristics, the TM010 mould of coaxial cavity is fit to accelerated electron, and near the magnetic field near the linear highfield makes the horizontal self-focusing of electron beam, need not to increase focus module.
Referring to Figure 10, the left side of figure is the right view of coaxial cavity 8 and coupling mechanism 14, and the right side is the front elevation of coaxial cavity 8 and coupling mechanism 14, and the field of drawing is the field pattern of this view depth direction (vertical paper direction) midsection.In order to play TM at the coaxial cavity underexcitation
010The field pattern of transmission must mate with the field pattern in the coaxial cavity in the field of mould, coupling mechanism (grey color part among Figure 10).The minimum mould of working in waveguide coupler is TE
10Mould will adopt this field pattern to carry out the power feed-in, only need coupling mechanism be installed as shown in the figure and get final product.The minor face that also is waveguide is parallel to the coaxial cavity axis, and long limit is perpendicular to the coaxial cavity axis.See that from Figure 10 field pattern coupling in coupling mechanism and the coaxial cavity can effectively encourage TM in coaxial cavity at this moment
010The field of mould.
Current-limiting apparatus 16 can be installed in the maximum field position of coaxial cavity 8, the electron beam group of the about 10keV of emission zero energy.The movement locus of electron beam group in the coaxial cavity electromagnetic field of canonical parameter seen Fig. 7.The left side is the coaxial cavity left view that amplifies among Fig. 7, and the right side will be amplified near the electron beam.The about 5cm of the height of coaxial cavity, from Fig. 7 right side electron beam group movement locus enlarged drawing (filtering trapped electron not, and the big part of the electron density of only having drawn) as can be seen, electron beam group's lateral dimension has the trend of increase when the inner acceleration of coaxial cavity, but going out the drift section behind the coaxial cavity because the transverse momentum modulation that is subjected to when inner in the chamber has presented the pack effect.Here it is exists the reason of drift section between coaxial cavity 8 and the metallic target 9, drift section can make electron beam roll into a ball horizontal self-focusing.
In certain embodiments, because actual installation, metallic target 9 and detector 11 can not be positioned at same lengthwise position, so the X ray that the electron beam target practice produces can the oblique detector surface that is mapped to.Therefore, need the surface of tilt detector, make it vertical with X ray master incident direction.
In addition, tilt for guaranteeing elementary X ray master incident direction, the target surface normal direction that need make metallic target 9 is one greater than 90 ° angle with the electron beam incident direction, and this " inclination " that has just caused the metallic target target surface as shown in Figure 8.Preferably, the target surface normal direction of metallic target is about 135 ° of angles with the electron beam incident direction.
In certain embodiments, in order to make the X ray better quality of irradiating object, need between metallic target 9 and detector 11, install collimating apparatus 12 additional.As shown in Figure 8, the effect of collimating apparatus 12 is the elementary X ray (X ray that produces when being electronic target) that stop a part, only allow the elementary X ray of core pass through, thereby make the directivity of X ray better, the angle of X ray intensity distributes to the interference of data accuracy when avoiding the detector multilayer.
In certain embodiments, even consider and installed collimating apparatus 12 additional, X ray intensity still has certain angle to distribute, and can utilize this angle to distribute to realize the purpose of a circle scanning multilayer imaging." detector multilayer " just is divided into multilayer with detector, when detector surface is arrived in x-ray bombardment, different layers is experienced different X ray intensity (having carried the information of the different sections of object), thereby obtain the data of a plurality of sections of object, after one circle scanning was finished, a plurality of sections had all obtained imaging.The detector multilayer can shorten the entire scan time.
In illustrated embodiment, the scheme that has adopted coaxial resonator that electron beam is quickened, but in other embodiments, can not use coaxial resonator that electron beam is quickened, for example adopt high-voltage electric field that electron beam is quickened.Perhaps, in certain embodiments,, then need not any accelerator if the intensity of the electron beam that the electron gun transmitter unit produces is enough.
In certain embodiments, above-mentioned CT equipment has multiple mode of operation.This is by the structures shape of its electron source, also is the advantage of the CT equipment of present technique with respect to other CT.Referring to Fig. 9, (a) chart is understood normal mode of operation: the continuous electron beam that 16 pairs of electron guns 7 of current-limiting apparatus send carries out current limliting on annular trace, electron beam is got to metallic target 9 back and is sent X ray from target spot 13 and penetrate object, and then is detected device 11 and receives and obtain data.
In certain embodiments, can increase driving mechanism, make current-limiting apparatus 16 wriggle.Still referring to Fig. 9, (b) figure has shown another mode of operation, i.e. " wriggling " of current-limiting apparatus 16.So-called " wriggling " is exactly that current-limiting apparatus 16 place circumference back and forth rotate in a low-angle, and the benefit of this pattern is to improve spatial resolution.Target spot is followed current-limiting apparatus 16 rotations, the angle that X ray can't cover before the X ray that sends had covered.From this visual angle, " wriggling " of current-limiting apparatus 16 is equivalent to encrypt at double the density of electron beam, just electron beam density strengthened one times such as the state of " wriggling " to (b) figure.The number of times of electronics emission is many more in " wriggling ", and level of encryption is just big more, and the spatial resolution of CT is also just high more.
For example, in certain embodiments, increase driving mechanism for illustrated equipment, be configured to when electron beam generating device produces electron beam, drive current-limiting apparatus 16 and back and forth rotate an angle, this angle is smaller or equal to the angle that circle center line connecting became of hole adjacent on the current-limiting apparatus with place, a plurality of hole circumference that is circular layout.
Although should be pointed out that the present technique main application fields, because the adjustability of X ray energy still has need to be applied to the therapeutic treatment of sigmatron or the potentiality in industrial nondestructive testing field in the medical imaging field.
Though in the above-described embodiments, employing be that the electron beam that electron gun produces is carried out circular scanning, and then carry out current limliting with current-limiting apparatus 16 and produce and be parallel to axial electron beam, also can adopt other electron beam generating apparatus.
According to other embodiment of present technique, beat the diameter of the target spot on metallic target 9 in order to improve electron beam, thereby improve the spatial resolution of CT equipment, circular cowling 18 can also be set in the metallic target front.As shown in figure 11, this circular cowling for example has less hole, thereby the target spot size of parallel electron beam on metallic target 9 that produces from current-limiting apparatus 16 retrained.According to other embodiment, can also between current-limiting apparatus 16 and metallic target 9, the high-pressure uniform electric field be set, the electron beam that current-limiting apparatus 16 is produced quickens.
Though in the above embodiments, the different examples of setting of producing method, accelerated mode and the metallic target of parallel electron beam have been provided respectively, but those skilled in the art should expect that the modes that these are different make up the embodiment that produces other, are not described in detail here.
In other embodiments, also provide a kind of method of CT equipment, comprised step: produced an electron beam from electron gun; Described electron beam is carried out deflection, and yawing moment changes in time, realizes circular scanning; With current-limiting apparatus described electron beam is carried out current limliting, make, export a plurality of electron beams of annular spread when described electron beam during along a plurality of holes scanning that is circular layout with a plurality of holes that are circular layout; With described beam bombardment one annular reflection target, the X ray of the axes intersect of the electron beam of generation and described annular spread; And detect the X ray penetrate behind the tested object.
According to other embodiment, described method also comprises step: utilize the resonance accelerating cavity work in the TM010 pattern that the electron beam of annular spread is quickened successively.
According to other embodiment, described method also comprises step: utilize coupling mechanism with the described resonance accelerating cavity of microwave feed-in that microwave power source produces, successively described electron beam is quickened.
According to other embodiment, described method also comprises step: when electron beam generating device produces electron beam, drive described current-limiting apparatus and back and forth rotate an angle, described angle is smaller or equal to the angle that circle center line connecting became of hole adjacent on the current-limiting apparatus with described place, a plurality of hole circumference that is circular layout.
Above detailed description has been set forth numerous embodiment of CT equipment and operating process by using synoptic diagram, process flow diagram and/or example.Comprise in this synoptic diagram, process flow diagram and/or example under the situation of one or more functions and/or operation, it will be understood by those skilled in the art that each function and/or operation in this synoptic diagram, process flow diagram or the example can be by various structures, hardware, software, firmware or their the separately next and/or common realizations of combination in any in fact.In one embodiment, the several portions of the described theme of embodiment of present technique can be realized by special IC (ASIC), field programmable gate array (FPGA), digital signal processor (DSP) or other integrated forms.Yet, those skilled in the art will recognize that, some aspects of embodiment disclosed herein can be implemented in the integrated circuit on the whole or partly with being equal to, (for example be embodied as one or more computer programs of on one or more computing machine, moving, be embodied as one or more programs of on one or more computer system, moving), (for example be embodied as one or more programs of on one or more processors, moving, be embodied as one or more programs of on one or more microprocessors, moving), be embodied as firmware, perhaps be embodied as the combination in any of aforesaid way in fact, and those skilled in the art will possess design circuit and/or write software and/or the ability of firmware code according to the disclosure.In addition, those skilled in the art will recognize that, the mechanism of the described theme of the disclosure can be distributed as the program product of various ways, and regardless of the actual particular type that is used for carrying out the signal bearing medium of distribution, the exemplary embodiment of the described theme of the disclosure all is suitable for.The example of signal bearing medium includes but not limited to: recordable-type media, as floppy disk, hard disk drive, compact-disc (CD), digital universal disc (DVD), numerical tape, computer memory etc.; And transmission type media, as numeral and/or analogue communication medium (for example, optical fiber cable, waveguide, wire communication link, wireless communication link etc.).
Though described present technique with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from technology because present technique can specifically be implemented in a variety of forms, so be to be understood that, the foregoing description is not limited to any aforesaid details, and should be in the spirit and scope that claim limited of enclosing explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (10)
1. a CT equipment is characterized in that, comprising:
Electron beam generating device, comprise electron gun, deflection scanning device and current-limiting apparatus, its electron gun produces electron beam, described deflection scanning device carries out deflection to described electron beam, yawing moment changes in time, realizes circular scanning, and described current-limiting apparatus has a plurality of holes that are circular layout, when described electron beam during along a plurality of holes scanning that is circular layout, a plurality of electron beams of output annular spread;
The annular reflection target, with the coaxial setting of the electron beam of described annular spread, the described annular reflection target of the beam bombardment of wherein said annular spread, the X ray of the axes intersect of the electron beam of generation and annular spread; And
The annular detector array with the coaxial setting of described annular reflection target, comprises a plurality of detector cells, and wherein said X ray incides corresponding detector cells after penetrating tested object.
2. CT equipment as claimed in claim 1 is characterized in that, also comprises: the resonance accelerating cavity, be configured to work in the TM010 pattern, and receive described electron beam generating device ejected electron bundle, and the electron beam that is received is quickened.
3. CT equipment as claimed in claim 2 is characterized in that, also comprises coupling mechanism and microwave power source, and described coupling mechanism quickens the described resonance accelerating cavity of microwave feed-in that described microwave power source produces to described electron beam.
4. CT equipment as claimed in claim 1, it is characterized in that, described electron beam generating device also comprises driving mechanism, be configured to when described electron beam generating device produces electron beam, drive described current-limiting apparatus and back and forth rotate an angle, described angle is smaller or equal to the angle that circle center line connecting became of hole adjacent on the current-limiting apparatus with described place, a plurality of hole circumference that is circular layout.
5. CT equipment as claimed in claim 1 is characterized in that, also comprises circular cowling, is arranged on described annular reflection target front end, has and the corresponding hole of described a plurality of electron beams, limits the bundle spot of described electron beam on described annular reflection target.
6. CT equipment as claimed in claim 3 is characterized in that, also comprises the drift joint, is arranged between described resonance accelerating cavity and the described endless metal target, is configured to make described electron beam to carry out horizontal self-focusing.
7. CT equipment as claimed in claim 1 is characterized in that, also comprises conveyer, carries the axial-movement of described inspected object along described annular detector array.
8. CT equipment as claimed in claim 1 is characterized in that, the target surface normal direction of described annular reflection target is spent greater than 90 with the angle between the electron beam incident direction.
9. CT equipment as claimed in claim 1 is characterized in that, also comprises collimating apparatus, and described X ray is collimated.
10. CT equipment as claimed in claim 1 is characterized in that, each detector cells of described annular detector array is specially the multi-layer detector unit.
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| CN103799985A (en) * | 2014-03-14 | 2014-05-21 | 湖南师范大学 | Microwave CT device |
| WO2014101599A1 (en) * | 2012-12-27 | 2014-07-03 | 清华大学 | Device and method for generating distributed x rays |
| WO2014101597A1 (en) * | 2012-12-31 | 2014-07-03 | 清华大学 | Ct device and method thereof |
| WO2014101566A1 (en) * | 2012-12-31 | 2014-07-03 | 清华大学 | Ct device and method thereof |
| US9490099B2 (en) | 2014-08-20 | 2016-11-08 | Wisconsin Alumni Research Foundation | System and method for multi-source X-ray-based imaging |
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2013
- 2013-01-28 CN CN 201320045999 patent/CN203083952U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014101599A1 (en) * | 2012-12-27 | 2014-07-03 | 清华大学 | Device and method for generating distributed x rays |
| US9786465B2 (en) | 2012-12-27 | 2017-10-10 | Tsinghua University | Apparatuses and methods for generating distributed x-rays |
| US9991085B2 (en) | 2012-12-27 | 2018-06-05 | Tsinghua University | Apparatuses and methods for generating distributed x-rays in a scanning manner |
| WO2014101597A1 (en) * | 2012-12-31 | 2014-07-03 | 清华大学 | Ct device and method thereof |
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