CN105188250A - Target component and linear accelerator with target component - Google Patents
Target component and linear accelerator with target component Download PDFInfo
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- CN105188250A CN105188250A CN201510570968.2A CN201510570968A CN105188250A CN 105188250 A CN105188250 A CN 105188250A CN 201510570968 A CN201510570968 A CN 201510570968A CN 105188250 A CN105188250 A CN 105188250A
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Abstract
The invention discloses a target component. The target component comprises a base, a substrate and a driving component; the substrate is supported on the base and provided with a plurality of incident windows; target sheets or beam expansion metal sheets are arranged in the incident windows; and the driving component drives the substrate to move on the base, such that the incident windows aligned to the beam exit direction of an electron beam are converted. According to the target component disclosed by the invention, energy level switching of same beams can be realized; and optimally, switching of various kinds of energy levels of different beams can be realized.
Description
Technical field
The present invention relates to a kind of target assembly, particularly relate to a kind of target assembly of linear accelerator of radiotherapy apparatus.
Background technology
Radiotherapy is a kind of usual way for the treatment of of cancer, and it adopts the various particle beams and radiation source, such as high energy ion beam, high-power electron beam or sigmatron etc., by by their irradiation on cancerous tissue to kill cancer cell, reach the object for the treatment of.
What above-mentioned radiotherapy adopted usually is medical electron linear accelerator, it comprises accelerating tube and treatment head, wherein, the operation principle of accelerating tube is that the electronics from electron gun is accelerated to high energy under the effect of microwave electric field, export aforesaid electron beam or target practice generation sigmatron, be used for the treatment of patient.Such as, for 6MeV low energy accelerator, electron beam is converted to X ray by its target.According to the height exporting energy, in prior art, usually linear accelerator can be divided into low energy machine (4 ~ 6MeV), middle energy machine (8 ~ 15MeV) and three kinds, high energy machine (20 ~ 25MeV).
In addition, in radiation therapy process, usually need in advance or put position in thing to be irradiated more accurately.Pendulum position just needs linear accelerator to carry or peripheral hardware imaging system.At present, there is the linear accelerator with electronics launched field imaging device (EPID, ElectronicPortalImagingDevice).Generally speaking, there is the linear accelerator of EPID system, adopt keV level radial imaging, MeV level beta ray therapy.
But even if with the linear accelerator of EPID system, the target assembly of its imaging and treatment is also separate.Now, it is desirable to provide a kind of target assembly, the energy level that can either realize beam of the same race switches, and more preferably can realize again the switching of the various energy level of beam not of the same race beam even not of the same race.
Summary of the invention
The object of the present invention is to provide a kind of target assembly.Described target assembly comprises: base; Pedestal, it is supported on described base, it is limited with a plurality of incoming position, and described incoming position is furnished with target and/or beam-expanding element; And driven unit, drive that described pedestal is mobile on described base goes out with conversion and electron beam the incoming position that Shu Fangxiang aims at.
Particularly, this target assembly also comprises guidance set, and it is arranged between described base and described pedestal to make described pedestal move on described base along desired trajectory.More specifically, described guidance set is guide rail slide block structure, and described guide rail is arranged on in described base and described pedestal, and described slide block is arranged on another of described base and described pedestal.Selectively, described desired trajectory is straight path, arc trajectory, elliptical path or annular trace.
Particularly, described target is tungsten system or aluminum target sheet.Described beam-expanding element is aluminium flake or thin platinized platinum.
Further, this target assembly also comprises detecting unit, and it is for the position of the displacement and/or described a plurality of incoming position that detect the relatively described base of described pedestal.Further, described detecting unit comprises displacement transducer and limit switch.
Particularly, described driven unit comprises drive source and transmission component, and described transmission component drives described pedestal to move on described base under described drive source drives.More specifically, described drive source comprises motor, described transmission component comprises gear train and leading screw and nut mechanism, wherein, nut in described leading screw and nut mechanism is fixed to described pedestal, gear train described in described driven by motor, the screw turns of leading screw and nut mechanism described in described gear set drive is to make described nut translation thus to drive described pedestal along described base translation.
Selectively, described a plurality of incoming position all arranges beam-expanding element, and is configured to the electric wire being suitable for the different energy level of outgoing.Selectively, described a plurality of incoming position all arranges target, and is configured to the X ray being suitable for the different energy level of outgoing.Selectively, described a plurality of incoming position arranges target and beam-expanding element respectively, and is configured to be suitable for exit Xray and electric wire.Further, in described a plurality of incoming position, at least two incoming positions arrange that target is to be suitable for the X ray of the different energy level of outgoing; Or in described a plurality of incoming position, at least two incoming positions arrange that beam-expanding element is to be suitable for the electric wire of the different energy level of outgoing.
Further, this target assembly also comprises cooling package, and it is for cooling the region at least one place in described a plurality of incoming position.Particularly, described cooling package comprises coolant loop, and it is embedded at least in part in described pedestal, and described coolant loop holds coolant.
Preferably, described pedestal is releasably attached on described driven unit at the first end of base, and described pedestal is configured to when described pedestal described pedestal after the first end of described base and the connection of described driven unit are disassembled moves along described base and can be removed from the second side of described base.
According to one embodiment of the present invention, also disclose a kind of target assembly, it comprises: base; Pedestal, it is supported on described base, it has at least two incoming positions, and described at least two incoming positions are configured to from different to go out emission mode corresponding; And driven unit, drive that described pedestal is mobile on described base goes out with conversion and electron beam the incoming position that Shu Fangxiang aims at.Selectively, two equal limited holes in described at least two incoming positions and be arranged beam-expanding element, and the pattern that described two incoming positions are configured to the electric wire of energy level different from outgoing is corresponding.Selectively, all arrange target for two in described at least two incoming positions, and the pattern that described two incoming positions are configured to the X ray of energy level different from outgoing is corresponding.Selectively, in two in described at least two incoming positions, one of them incoming position place arranges target, wherein another incoming position place limited hole and arrange beam-expanding element, and these two incoming positions are configured to corresponding with the pattern of exit Xray and electric wire.Further, also there is an incoming position and arrange that target is to be suitable for the X ray of the different energy level of outgoing; Or also there is an incoming position limited hole and arrange that beam-expanding element is to be suitable for the electric wire of the different energy level of outgoing.
According to one embodiment of the present invention, disclose a kind of target assembly, it comprises: pedestal, it has at least two incoming positions, and described at least two incoming positions are configured to from different to go out emission mode corresponding; Driven unit, drive described pedestal along planned orbit move to convert with the electron beam from accelerating tube go out incoming position that Shu Fangxiang aims at thus change emission mode.Selectively, two equal limited holes in described at least two incoming positions and be arranged beam-expanding element, and the pattern that described two incoming positions are configured to the electric wire of energy level different from outgoing is corresponding.Selectively, all arrange target for two in described at least two incoming positions, and the pattern that described two incoming positions are configured to the X ray of energy level different from outgoing is corresponding.Selectively, in two in described at least two incoming positions, one of them incoming position place arranges target, wherein another incoming position place limited hole and arrange beam-expanding element, and these two incoming positions are configured to corresponding with the pattern of exit Xray and electric wire.Further, also there is an incoming position and arrange that target is to be suitable for the X ray of the different energy level of outgoing; Or also there is an incoming position limited hole and arrange that beam-expanding element is to be suitable for the electric wire of the different energy level of outgoing.
According to one embodiment of the present invention, also disclose a kind of linear accelerator, it comprises the target assembly of various execution mode as previously mentioned.
According to target assembly of the present invention, substrate can move along planned orbit (track) thus be aimed at by the Shu Fangxiang that goes out of the specific incoming position in multiple incoming position with the electron beam of accelerating tube.Like this, on the one hand, the energy switching of outgoing beam of the same race (such as, X ray) or the switching of variety classes outgoing beam (such as, electron beam and X ray) can be met.
According to target assembly of the present invention, after the part that removably connects of substrate and driven unit is released, substrate can move along planned orbit and take out from treatment head on base, like this, is convenient to the target that detects and change on substrate and/or beam-expanding element.In the process, do not need dismounting treatment head, shorten preventive maintenance time.
According to target assembly of the present invention, because there is detecting unit, and in a preferred embodiment, this detecting unit can detect displacement information and positional information simultaneously, so positioning precision is higher.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that the substrate of target assembly is in the first state;
Fig. 2 is the schematic diagram that the substrate of target assembly is in the second state;
Fig. 3 is the schematic diagram of the driven unit of target assembly;
Fig. 4 is the exploded view after target assembly removes base and driven unit; And
Fig. 5 is a part for the linear accelerator of the target assembly with Fig. 1-Fig. 4.
Embodiment
Below in conjunction with the drawings and specific embodiments, the x-ray target assembly that the present invention proposes is described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Fig. 1 is the schematic diagram that the substrate of target assembly is in the first state; Fig. 2 is the schematic diagram that the substrate of target assembly is in the second state, and Fig. 3 is the schematic diagram of the driven unit of target assembly; Fig. 4 is the exploded view after target assembly removes base and driven unit; Fig. 5 is a part for the linear accelerator of the target assembly with Fig. 1-Fig. 4.
First see Fig. 5, according to one embodiment of the present invention, disclose a kind of linear accelerator 400.This linear accelerator 400 comprises accelerating tube 200 and treatment 300, wherein, accelerating tube 200 is for generation of the electron beam accelerated, treatment 300 is fixed to the below of accelerating tube 200, from the electron beam of accelerating tube via injection treatment electron beam after the target assembly 100 for the treatment of 300 or treatment X ray or imaging X ray.Hereafter in detail target assembly 100 will be described in detail.
As Figure 1-Figure 4, according to one embodiment of the present invention, disclose a kind of target assembly 100.Particularly, this target assembly 100 comprises base 102, pedestal 104 and driven unit 106.More specifically, this base 102 is the plate of general square shape, and it is fixed on plate 10, and wherein, this plate 10 is generally Steel material, and it forms a part for the treatment 300 of linear accelerator 400.Base 102 is by high density material, and such as tungsten, makes, it is limited with longitudinal fluting 108, the both sides of longitudinal fluting 108 are fixed with two pieces of fixed blocks 110 respectively, and this fixed block 110 has extended internally outstanding, like this, four pieces of fixed blocks 110 constitute for supporting the guide rail with guide base 104.In addition, as shown in the figure, on plate 10, also be fixed with a pair auxiliary guide rail, it is made up of a pair time fixed block 112 and screw thread is fixed to lower fixed block 112 respectively upper fixed block 114, and on this, fixed block 114 is substantially identical with the shape of aforementioned fixed block 110, namely, also have flange, the stroke that this auxiliary guide rail and aforementioned guide rail coordinate this pedestal 104 is advanced along guide rail is jointly longer.Pedestal 104 is roughly tabular, both sides be equipped with in a longitudinal direction with aforementioned fixed block 110, on the groove 116 that fits each other of the flange of fixed block 114.The upper surface of pedestal 104 is also limited with the first groove 118 and the second groove 120.In the first groove 118, first substrate 122 is fixed in wherein by securing members such as such as screws, this first substrate 122 is formed by copper product, in turn be limited with five through holes 124 vertically offered in a longitudinal direction, in each through hole 124, be also furnished with scattering platinum or flake aluminum expands for electron beam, the scattering platinum wherein in five through holes 124 or the thickness of flake aluminum can be different so that expand the electron beam of different capacity.Such as, the electric wire energy of each through hole 124 correspondence can be from left to right 6MeV, 8MeV, 10MeV, 12MeV, 14MeV successively.Notoriously, this wire harnesses may be used for the oncotherapy of shallow-layer, such as skin cancer treatment.In the second groove 120, second substrate 126 and cover plate 128 are arranged in wherein, this second substrate 126 and cover plate 128 can be formed by copper product, second substrate 126 limit fluted, 3rd substrate 130 made of copper is placed in groove and is also fixed on second substrate 126 by the connected mode of such as welding, and when being at least also limited with cavity volume between the lower surface of the 3rd substrate 130 and second substrate 126 after the 3rd substrate 130 is fixed in second substrate 126, it is for holding the coolant addressed subsequently.Further, the upper surface of the 3rd substrate 130 is also fixed with tungsten target 131, and it, for producing X ray, especially sigmatron when being clashed into by electron beam, for radiotherapy, is particularly useful for the radiotherapy of deep layer.The peak energy of described X ray can be 2MeV, and the material of aforementioned target can be tungsten.Contiguous 3rd substrate 130, the upper surface of second substrate 126 is also fixed with x-ray imaging target 132, such as made of aluminum, for producing X ray when being clashed into by electron beam, be particularly useful for producing the low energy X ray being suitable for imaging, its peak energy is generally 60keV.In the below of x-ray imaging target 132, on second substrate 126, offer two horizontal through hole being communicated to aforesaid housing compartment respectively along the longitudinal so that the introducing of follow-up coolant and discharge.Cooling package 134 comprises entrance copper pipe 136 and outlet section copper pipe 138, this entrance copper pipe 136 one end is connected to the insertion of the pipe joint other end and is also fixed in one of them horizontal through hole Fluid Sealing, be provided with target current at entrance copper pipe 136 away from second substrate 126 place and detect interface 140 to detect target current, remainder is then coated with insulating material.Outlet section copper pipe 138 one end is connected to the insertion of the pipe joint other end and is also fixed in another horizontal through hole Fluid Sealing, and it is coated with insulating material.Aforementioned coolant is generally water.When mounted, the second substrate 126 with copper pipe 136,138 is first placed in groove, and then is covered on copper pipe 136,138 by cover plate 128, is then fixed on substrate 104 by cover plate 128 with securing members such as such as screws.
Driven unit 106 comprises motor 142 and transmission component 144, and motor 142 is fixed on the side contrary with base 102 of plate 10.Transmission component 144 comprises gear train and screw-nut body, particularly, this gear train is all fixed to laterally to be located on the fixed block 146 of base 102, comprise driving gear 148 and driven gear 150, wherein, the output shaft that driving gear 148 is connected to motor 142 is driven by motor 142, and driven gear 150 engages with driving gear 148 and its output shaft is the leading screw 152 of screw-nut body, and nut 154 to be threaded onto on leading screw 152 and to be fixed to pedestal 104.
Target assembly 100 also comprises checkout gear, and it comprises displacement transducer 156, limit switch 158 and controller (not shown), and its middle controller is respectively coupled to aforesaid displacement transducer 156 and limit switch 158.Particularly, this displacement transducer 156 is for detecting the displacement of substrate 104 respect thereto 102; This limit switch 158 detects coding site, particularly, have three limit switches 158, these three limit switches 158 can carry out precoding to original position, 5 electric wire Exit positions, 1 treatment X ray Exit positions and 1 imaging X ray Exit positions and detect.Particularly, when under the driving at motor 142, when nut 154 drives substrate 104 opposed bottom 102 to move to make the concrete Exit positions of the electron beam alignment from accelerating tube, displacement transducer 156 first detects the displacement of substrate 104 opposed bottom 102, whether limit switch 158 can detect physical location corresponding with coding site, if corresponding, then feed back displacement information and corresponding code signal, according to the feedack of displacement transducer and limit switch, controller controls motor 142 and moves and stop.
When operator wishes that linear accelerator is transformed into imaging pattern from Therapeutic mode, namely, the Shu Fangxiang that goes out for the treatment of x-ray target 131 and the electron beam from accelerating tube is aimed at and transfers imaging x-ray target 132 to and aim at the Shu Fangxiang that goes out of the electron beam from accelerating tube, in other words, the substrate 104 of running target assembly 100 is converted to imaging x-ray target 132 to make the treatment x-ray target 131 being in service position, controller sends instruction and controls motor 142 and rotate and drive substrate 104 respect thereto 102 to move and the coding site that the displacement detected according to displacement transducer 156 and limit switch 158 detect judges whether to arrive precalculated position, when displacement and coding site all show that current location is precalculated position, controller controls motor 142 stop motion.Such as, in pre-stored information, in the therapeutic mode, that is, when the treatment x-ray target on target assembly is in service position place, the displacement that displacement transducer 156 detects such as should be A, and the coding site that limit switch detects such as should be (1,1,0); Under imaging pattern, that is, when the imaging x-ray target on target assembly is in service position place, the displacement that displacement transducer 156 detects should be B, and the coding site that limit switch 158 detects should be (1,1,1); Then, in previous mode conversion, when displacement transducer 156 detects that displacement is B, and when limit switch 158 detects that coding site is (1,1,1), controller can control motor 142 motion to be stopped.
About the energy level handoff procedure of electron beam or the handoff procedure between electron beam and X ray, substantially similar with aforementioned process, do not repeat them here.
Wherein, aforementioned displacements transducer can be grating scale formula, magnetic railings ruler formula, appearance grid chi formula or linear potentiometer, and aforementioned limit switch can be mechanical type, Hall-type or photoelectric type limit switch.
The guide rail slide block structure that aforementioned fixed block and pedestal are formed is illustrative, and not restrictive.Those skilled in the art should be appreciated that and can arrange other guide frames to make pedestal along specific orbiting motion between base and pedestal.But also be appreciated that this track can be rectilinear, arc, oval, circular etc.
In this embodiment, electric wire energy has Pyatyi to export, but those of ordinary skill in the art should be appreciated that and can set more or less electric wire Energy transmission gear and concrete electric wire output energy according to the actual requirements.Further, in the present embodiment, although be provided with, electric wire exports, treatment X ray exports and imaging X ray exports, but is appreciated that and only can arranges wherein two kinds of output modes, or arranges more kinds of output mode.And also easy understand, the through hole exported for electric wire and/or the order of target on substrate for X ray output can regulate according to actual requirement.
In previous embodiment, scattering platinum or flake aluminum are the elements expanded as electron beam, those skilled in the art should be appreciated that, scattering platinum or flake aluminum are exemplary and nonrestrictive, there is the effect that thin slice that other materials makes also can realize aforementioned beam-expanding element in prior art, do not repeat them here.
Be further appreciated that the transmission component of aforesaid driven unit by other common transmission mechanisms that gyration can be transferred to translational motion, can substitute, such as pinion and rack.Also be appreciated that, if substrate is circular, ellipse or arc at the movement locus of base, the composed component of aforementioned driven unit also must do adaptive change, such as, if substrate is annular at the movement locus of base, can apply the gyration mechanism that high speed rotary motion can be transformed into low speed gyration, such as high gear group adds worm-and-wheel gear.
According to previous embodiment, this copper pipe is divided into entrance copper pipe and outlet section copper pipe, but be appreciated that this copper pipe can for U-shaped, this coolant also can be oily.
With reference to the accompanying drawings shown in 1-5, this pedestal 104 is releasably attached on driven unit 106 at the first end of base 102, particularly, be threaded onto on the nut 154 of screw-nut body, pedestal 104 is configured to when described pedestal 104 pedestal 104 after the first end of base 102 and the connection of driven unit 106 are disassembled moves along base 102 and can be removed from the second side of base 102.The object of such design is: regularly or non-regularly can take out pedestal 104 so that detect and change target and/or beam-expanding element from treatment head.In the taking-up process of this pedestal 104, compared to prior art, because treatment head need not be dismantled, shorten preventive maintenance time widely.
According to target assembly of the present invention, substrate can move along planned orbit (track) thus be aimed at by the Shu Fangxiang that goes out of the specific incoming position in multiple incoming position with the electron beam of accelerating tube.Like this, on the one hand, the energy switching of outgoing beam of the same race (such as, X ray) or the switching of variety classes outgoing beam (such as, electron beam and X ray) can be met.
According to target assembly of the present invention, because there is detecting unit, and in a preferred embodiment, this detecting unit can detect displacement information and positional information simultaneously, so positioning precision is higher.
Foregoing description is only the description to present pre-ferred embodiments, any restriction not to the scope of the invention, and any change that the those of ordinary skill in field of the present invention does according to above-mentioned disclosure, modification, all belong to the protection range of claims.
Claims (28)
1. a target assembly, it comprises:
Base;
Pedestal, it is supported on described base, it is limited with a plurality of incoming position, and described incoming position is furnished with target and/or beam-expanding element;
Driven unit, drives that described pedestal is mobile on described base goes out with conversion and electron beam the incoming position that Shu Fangxiang aims at.
2. target assembly according to claim 1, wherein, also comprises guidance set, and it is arranged between described base and described pedestal to make described pedestal move on described base along desired trajectory.
3. target assembly according to claim 2, wherein, described guidance set is guide rail slide block structure, and described guide rail is arranged on in described base and described pedestal, and described slide block is arranged on another of described base and described pedestal.
4. target assembly according to claim 2, wherein, described desired trajectory is straight path, arc trajectory, elliptical path or annular trace.
5. target assembly according to claim 1, wherein, described target is tungsten system or aluminum target sheet.
6. target assembly according to claim 1, wherein, described beam-expanding element is aluminium flake or thin platinized platinum.
7. target assembly according to claim 1, wherein, also comprises detecting unit, and it is for the position of the displacement and/or described a plurality of incoming position that detect the relatively described base of described pedestal.
8. target assembly according to claim 7, wherein, described detecting unit comprises displacement transducer and limit switch.
9. target assembly according to claim 1, wherein, described driven unit comprises drive source and transmission component, and described transmission component drives described pedestal to move on described base under described drive source drives.
10. target assembly according to claim 9, wherein, described drive source comprises motor, described transmission component comprises gear train and leading screw and nut mechanism, wherein, nut in described leading screw and nut mechanism is fixed to described pedestal, gear train described in described driven by motor, and the screw turns of leading screw and nut mechanism described in described gear set drive is to make described nut translation thus to drive described pedestal along described base translation.
11. target assemblies according to claim 1, wherein, described a plurality of incoming position all arranges beam-expanding element, and is configured to the electric wire being suitable for the different energy level of outgoing.
12. target assemblies according to claim 1, wherein, described a plurality of incoming position all arranges target, and is configured to the X ray being suitable for the different energy level of outgoing.
13. target assemblies according to claim 1, wherein, described a plurality of incoming position arranges target and beam-expanding element respectively, and is configured to be suitable for exit Xray and electric wire.
14. target assemblies according to claim 13, wherein, in described a plurality of incoming position, at least two incoming positions arrange that target is to be suitable for the X ray of the different energy level of outgoing; Or in described a plurality of incoming position, at least two incoming positions arrange that beam-expanding element is to be suitable for the electric wire of the different energy level of outgoing.
15. target assemblies according to claim 1, wherein, also comprise cooling package, and it is for cooling the region at least one place in described a plurality of incoming position.
16. target assemblies according to claim 15, wherein, described cooling package comprises coolant loop, and it is embedded at least in part in described pedestal, and described coolant loop holds coolant.
17. target assemblies according to claim 1, wherein, described pedestal is releasably attached on described driven unit at the first end of base, and described pedestal is configured to when described pedestal described pedestal after the first end of described base and the connection of described driven unit are disassembled moves along described base and can be removed from the second side of described base.
18. 1 kinds of linear accelerators, comprise the target assembly as described in any one of claim 1-17.
19. 1 kinds of target assemblies, comprising:
Base;
Pedestal, it is supported on described base, it has at least two incoming positions, and described at least two incoming positions are configured to from different to go out emission mode corresponding;
Driven unit, drives that described pedestal is mobile on described base goes out with conversion and electron beam the incoming position that Shu Fangxiang aims at.
20. target assemblies according to claim 19, two equal limited holes in described at least two incoming positions and be arranged beam-expanding element, and the pattern that described two incoming positions are configured to the electric wire of energy level different from outgoing is corresponding.
21. target assemblies according to claim 19, wherein, all arrange target for two in described at least two incoming positions, and the pattern that described two incoming positions are configured to the X ray of energy level different from outgoing are corresponding.
22. target assemblies according to claim 19, wherein, in two in described at least two incoming positions, one of them incoming position place arranges target, wherein another incoming position place limited hole and arrange beam-expanding element, and these two incoming positions are configured to corresponding with the pattern of exit Xray and electric wire.
23. target assemblies according to claim 22, wherein, also have an incoming position and arrange that target is to be suitable for the X ray of the different energy level of outgoing; Or also there is an incoming position limited hole and arrange that beam-expanding element is to be suitable for the electric wire of the different energy level of outgoing.
24. 1 kinds of target assemblies, comprising:
Pedestal, it has at least two incoming positions, and described at least two incoming positions are configured to from different to go out emission mode corresponding;
Driven unit, drive described pedestal along planned orbit move to convert with the electron beam from accelerating tube go out incoming position that Shu Fangxiang aims at thus change emission mode.
25. target assemblies according to claim 24, two equal limited holes in described at least two incoming positions and be arranged beam-expanding element, and the pattern that described two incoming positions are configured to the electric wire of energy level different from outgoing is corresponding.
26. target assemblies according to claim 24, wherein, all arrange target for two in described at least two incoming positions, and the pattern that described two incoming positions are configured to the X ray of energy level different from outgoing are corresponding.
27. target assemblies according to claim 24, wherein, in two in described at least two incoming positions, one of them incoming position place arranges target, wherein another incoming position place limited hole and arrange beam-expanding element, and these two incoming positions are configured to corresponding with the pattern of exit Xray and electric wire.
28. target assemblies according to claim 27, wherein, also have an incoming position and arrange that target is to be suitable for the X ray of the different energy level of outgoing; Or also there is an incoming position limited hole and arrange that beam-expanding element is to be suitable for the electric wire of the different energy level of outgoing.
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| CN108578913A (en) * | 2018-04-20 | 2018-09-28 | 上海联影医疗科技有限公司 | A kind of X-ray target assembly and radiotherapy apparatus |
| CN111515514A (en) * | 2020-04-10 | 2020-08-11 | 南京钢铁股份有限公司 | Travel action control method for electronic gun diaphragm valve |
| CN113154953A (en) * | 2021-03-05 | 2021-07-23 | 中国科学院近代物理研究所 | Target collimation positioning module, device and target shooting system |
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