CN101339819B - Remote controllable collimator with four parts independently moving - Google Patents
Remote controllable collimator with four parts independently moving Download PDFInfo
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Abstract
The invention relates to the technical field of a high-energy nondestructive test of radiography, industrial CT, van container/cargo inspection systems and the like and discloses a collimator which can remotely control four parts to independently move. The collimator comprises four parts which can independently move; each part consists of a collimation block, a fixing device, a driving device, an inhibiting device, a sensing device and a motor which are arranged in a collimator frame; meanwhile, each part further comprises a power supply device, a control device, a communication device, a remote-end controller and a zero collimator which cooperates with the power supply device, the control device, the communication device and the remote-end controller. The collimator of the invention can flexibly carry out the 2D definition of a radiation field, and can collimate the radiation field to various square pyramidal shapes which are suitable for the radiography or to a flat sector which is suitable for scanning imaging; the collimation block has a relatively great thickness and a specific shape and adopts a circular-arc orbit to lead to a rather clear boundary of the radiation field; meanwhile, the collimator can be provided with a remote control device and a display device to control the condition of the collimator at a far end.
Description
Technical field
The present invention relates to high energy technical field of nondestructive testing such as radiography, industry CT, van container/Cargo Inspection System, relate in particular to a kind of remote-controlled four part self-movement collimating apparatuss.
Background technology
With the high-energy ray source is the high energy Non-Destructive Testing field of radiation source, comprises radiography, industry CT, van container/Cargo Inspection System etc.The high-energy ray source is accelerator normally, and what the use of a small amount of system was also arranged is the high energy radioactive nuclide.The high energy Non-Destructive Testing comprises radiography, industry CT, van container/Cargo Inspection System etc.; Wherein radiography is to let seized object in the radiation field in high-energy ray source, make public a period of time, obtains the shapes/configurations information of object through the photosensitive device (X-ray film or X-ray imaging screen) of its backlight side; Industry CT is to let seized object place between high-energy ray source and the detector; Visit the transmitted intensity of getting through detector and utilize the Computer Processing imaging to obtain the structural information of object then, and can obtain very careful two dimension or the three-dimensional structure image of object through the multi-level radiant image of multi-angle; Van container/cargo detection system be seized object such as container, automobile, luggage parcel etc. through the passage between high-energy ray source and the detector, handle the last fluoroscopy images that generates object to be detected through Computer signal.In these high energy Non-Destructive Testings, all need define, only utilize a part of ray wherein to carry out radiography or scanning imagery through the radiation field of collimating apparatus to the high-energy ray source.
The main part of collimating apparatus stops by X ray is had usually/material of absorption makes, through the certain structure design, can stop a part of X ray, and let another part X ray pass through, to reach the purpose of collimation.For the X ray that needs stop, its blocking effect is by the material and the thickness decision of collimating apparatus.In different nondestructive detection systems; Collimating apparatus is collimated into different shapes with X-ray beam; As needing usually in the radiography, in scanning imagery, need usually the radiation field collimation is become thin fan-shaped, in the anterior shaped design collimating apparatus of pressing detector usually of detector with the side's of one-tenth taper of radiation field collimation; To stop the X ray of scattering, let detector only absorb the X ray that object is crossed in the forward direction transmission.Collimating apparatus has very significant effects to the photograph or the imaging effect of nondestructive detection system, is one of vitals in the nondestructive detection system.
In the existing technology; Collimating apparatus has has the fixed block pattern of finedraw in the middle of making, and opens the fixed block pattern of oblong aperture in the middle of perhaps, and these collimator structures are simple; Cost is low; But each collimating apparatus can only form a kind of fixing ray field, and can not adjust flexibly by the correlation field of line, and application conditions is very limited.
In the prior art; Also there is collimating apparatus to make mobilizable structure; But the ray field can only be adjusted on the direction of a dimension, discloses the collimating apparatus that a kind of CT of being used for system can adjust ray thickness like patent US7031434B1, and he utilizes the double-eccentric shaft column structure; When diaxon rotated, the gap of the two cylinders thickness of realizing the correlation field of line that changes was adjusted.In this structure; The border that limits the ray field is the tangent line of circle; Collimating apparatus stops the part of ray by being thinned to thick gradually changing, and the effect that stops ray also grows from weak to strong and gradually changes, make border, ray field transmitted intensity by by force to a little less than gradually change; Cause the border of ray field that a fuzzy zone is arranged, influence the photograph or the image quality of system.The another kind of collimating apparatus that medical CT system can adjust ray thickness that is used for is disclosed like patent US6173039B1.They can only realize the thickness adjustment on the dimension by the correlation field of line, can not realize the two dimension adjustment.
But patent FR2864685A1 discloses a kind of collimating apparatus that the radiography system correlation field of line carries out the two dimension adjustment that is used for.He uses six flat boards, per three one group a direction is adjusted, and wherein two is a pair of; Be installed on the axle, carry out relative motion, another piece is installed on another axle; Can independently moving, these six flat boards make up the two dimension adjustment that realizes radiation field through complicated motion.This patent has been used six flat boards, four axles, and structure is relatively complicated; The collimating apparatus main body is relatively thin flat board, can satisfy energy very low be the radiography system of radiation source with the X-ray machine, not being suitable for the very high accelerator of energy is the radiography system of radiation source.
Summary of the invention
The present invention proposes in order to address the above problem just.
The purpose of this invention is to provide a kind of four remote-controlled part self-movement collimating apparatuss; But all self-movements of this four part, wherein every part collimating apparatus include outer motor, gearing, the transmission joint of collimation piece, stationary installation, guide rail, leading screw and erecting frame shaped as frame structure that is installed in the erecting frame shaped as frame structure.
Wherein said stationary installation comprises transmission stationary installation and slip stationary installation; Said collimation piece both sides are separately installed with a pair of slip stationary installation; Every pair of slip stationary installation closely contacts with a guide rail that is between them; Can slide between slip stationary installation and the guide rail, in the collimation piece motion process because the effect of slip stationary installation with the orbiting motion of strictness along guide rail.
Said guide rail and leading screw be the edge of mounted in pairs in erecting frame shaped as frame structure respectively; Said collimation piece is installed on the said leading screw through a pair of transmission stationary installation of its both sides; Said transmission stationary installation and leading screw closely cooperate, and leading screw bears the weight of collimation piece through the transmission stationary installation and drives the motion of collimation piece.Between said transmission stationary installation and the collimation piece is a kind of flexible connection, makes the collimation piece have with respect to the transmission stationary installation and a spot ofly moves forward and backward and rotate.
Four collimation pieces can be to-and-fro movement in past upper and lower, the left and right zone of central point with the ray respectively, thereby the motion combination of four collimation pieces can be defined arbitrarily the ray open country in 2 dimensional region.The shape of guide rail is the arc that the center overlaps with the ray source point.
In some application scenario, can be according to the condition specific requirement, the center with beam is not the center, carries out wild the defining (like Fig. 8 B, 8D) of ray
Said collimation piece is in motion process, and the angle point of the wild subtended angle of the ray of formation remains on ray source point O point place always, thereby the ray field that the collimation piece is defined keeps the edge of " precipitous " the most.
One of said leading screw is stretched out from the shaped as frame structure of erecting frame, and each is to being separately installed with main driving wheel and from power wheel on the leading screw, motor, main driving wheel, from being provided with transmission joint (like belt pulley, chain etc.) between the power wheel; Make their coordinations under certain conditions; Driven by motor main driving wheel, main driving wheel drive from power wheel, and principal and subordinate's power wheel drives a pair of leading screw action synchronously; Make the motion of collimation piece, realize the scope adjustment wild ray.
Erecting frame shaped as frame structure also is equipped with position transducer outward, and said position transducer constitutes motion with master and slave power wheel or one of which and is connected, and can from the motion of master and slave power wheel, obtain the accurate action message of collimation piece.
In addition; In the erecting frame shaped as frame structure stop means is installed also, said stop means mounted in pairs is inboard in erecting frame shaped as frame structure, and the installation site can suitably be adjusted; When the collimation piece moved to the extreme position of system specialization, the collimation block edge touched stop means.
Erecting frame shaped as frame structure also is equipped with display device, manual switchgroup, control device, power interface, remote communication interface and far-end control system outward.Through said display device, information feedback can controlled and obtain in real time to manual switchgroup and control device nearby to the motion of each collimation piece.
Self-movement collimating apparatus of the present invention also is provided with remote communication interface and far-end control system; Said remote communication interface is installed in outside the erecting frame shaped as frame structure; Carrying out communication with far-end control system is connected; Make the motion of each collimation piece operate, and obtain the feedback of positional information in real time at far-end control system.Said control device has programmable logic controller spare, like PLC, can under specific program, carry out logic synthesis to manual switchgroup, position sensor information, stop means information and judge.
It is the system of radiation source that but four part self-movement collimating apparatuss of the present invention are applied to the accelerator, with the radiation field collimation side's of one-tenth taper or flat fan-shaped, can make system be used for radiography and scanning imagery simultaneously through collimating apparatus, has widened the range of application of system.Wherein but four part self-movement structures of collimating apparatus can be adjusted radiation field flexibly, have increased the range of application and the system flexibility of collimating apparatus greatly.Adopt the circular arc tracks, make that the border of radiation field is very obvious, help eliminating edge effect, improve photographic quality and image quality.
This collimating apparatus is equipped with telechiric device and display device, can carry out far-end control, makes that the use of system is convenient more.The more important thing is that in the high energy nondestructive detection system radiation source has usually that radioactivity is residual or have radioactivity for a long time, the far-end control function of collimating apparatus makes the staff away from radioactive source, and working environment is safer.
Description of drawings
Fig. 1 representes a kind of application radiography of the present invention and the concrete arrangement of the dual-purpose nondestructive detection system of CT;
But Fig. 2 representes a kind of four part self-movement collimating apparatuss of the present invention;
The positioned opposite of four collimation pieces relation in Fig. 3 presentation graphs 2;
The situation when Fig. 4 representes that but four part self-movement collimating apparatuss are only installed a part;
The horizontal cross-sectional schematic of Fig. 5 presentation graphs 2;
The vertical cross-sectional schematic of Fig. 6 presentation graphs 2;
Fig. 7 representes a kind of arrangement of control system;
Fig. 8 representes the wild example of several kinds of rays that collimating apparatus forms.
Among the figure: 1, accelerator; 2, shield assembly; 3, the 0th collimating apparatus; 4, collimating apparatus; 5, bundle is accused of in taper; 6, examined object body; 7, photosensitive device; 8, flat fan-ray beam; 9, back collimating apparatus; 10, detector; 11, signal Processing and imaging system; 12, far-end control system; 401, collimation piece; 402, slip stationary installation; 403, transmission stationary installation; 404, guide rail; 405, leading screw; 406, main driving wheel; 407, from power wheel; 408, motor; 409, stop means; 410, position transducer; 411, lever position indicator; 412, manual switchgroup; 413, control device; 414, power interface; 415, remote communication interface; 416, erecting frame; 417, erecting frame shaped as frame structure; 418, transmission joint.
Embodiment
Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
Fig. 1 representes a kind of application radiography of the present invention and the concrete arrangement of the dual-purpose nondestructive detection system of CT; This detection system is mainly by accelerator 1, shield assembly 2, the 0th collimating apparatus 3, collimating apparatus 4, cone beam 5, examined object body 6, photosensitive device 7, flat fan-ray beam 8, back collimating apparatus 9, compositions such as detector 10, signal Processing and imaging system 11 and far-end control system 12.
Wherein accelerator 1 is an x-ray source; Producing one is the main X ray that distributes by 4 π angle solid spaces with the forward direction; Shield assembly 2 stops side direction and back fall to useless X ray; To eliminate spuious X ray to detecting the influence of quality, the 0th collimating apparatus 3 X ray that forward direction is useful is limited in the wild scope of bigger taper ray.When system need work in the irradiation Photographing Mode; Collimating apparatus 4 can be constrained to a cone beam 5 according to the scope that the shape or the surveyed area of examined object body is complementary with the X ray that comes out from the 0th collimating apparatus 3 according to the control adjustment of far-end control system 12; This cone beam 5 is passed examined object body 6; Make photosensitive device 7 sensitization that are in examined object body 6 rear sides, thereby can on photosensitive device 7, obtain the internal information of examined object body.Back collimating apparatus 9, detector 10, signal Processing and imaging system 11 need not work under the irradiation Photographing Mode.When system need work in the CT pattern; Collimating apparatus 4 can be collimated into a flat fan-ray beam 8 with the X ray that comes out from the 0th collimating apparatus according to the requirement adjustment of control system; This cone beam is passed the examined object body; Through the back collimating apparatus that only allows direct X ray of coming to pass through from the transmission of examined object body; Get into detector, detector sends to signal Processing and imaging system with the information of the reflection examined object body structure of its acquisition, the final fine structure image that generates the examined object body in this system.Under the CT pattern, need not to place photosensitive device 7.
But Fig. 2 has represented a kind of four part self-movement collimating apparatuss of the present invention; Mainly by erecting frame 416, erecting frame shaped as frame structure 417, be installed in inboard 405,8 stop means 409 of 4 guide rails, 404,8 rhizoid thick sticks of erecting frame shaped as frame structure 417, be installed in 8 transmission stationary installations 403 on the leading screw 405, by 4 fixing collimation pieces 401 of transmission stationary installation 403, mounted in pairs 16 slip stationary installations 402 of collimation piece side, be installed in leading screw 405 outer ends 4 main driving wheels 406 and 4 from power wheel 407, be installed in 408,4 position transducers 410 of 4 motors, the transmission joint 418 in erecting frame shaped as frame structure 417 outsides, and be installed in compositions such as 411,4 manual switchgroups 412 of 4 lever position indicators on the erecting frame 416, control device 413, power interface 414, remote communication interface 415.Wherein motor, transmission joint, principal and subordinate's power wheel, leading screw, transmission stationary installation collimation piece have constituted a cover kinematic system; Guide rail, slip stationary installation constitute positioning system; Position transducer, stop means constitute motion feedback system; Lever position indicator, manual switchgroup, control device constitute local control system; Communication interface and far-end control device constitute telechirics.
Fig. 3 has represented the positioned opposite relation of four collimation pieces among Fig. 2.Collimation piece 401a can move up and down, and range of movement is up zone of ray center point; Collimation piece 401b can move up and down, and range of movement is that ray center point is toward lower area; These two collimation pieces have constituted regional up and down the defining in ray open country.Collimation piece 401c can side-to-side movement, and range of movement is the ray center point zone of turning right; Collimation piece 401d can side-to-side movement, and range of movement is the ray center point zone of turning left; These two collimation pieces have constituted defining zone about the ray open country.The motion combination of four collimation pieces just can be defined arbitrarily the ray open country in 2 dimensional region.
The situation when Fig. 4 has represented that but a kind of four part self-movement collimating apparatuss are only installed a part.Collimation piece 401a through a pair of transmission stationary installation 403a, 403b be fixed on a pair of leading screw 405a, 405b is last, between collimation piece 401a and transmission stationary installation 403a, the 403b is to flexibly connect, and allows relative front and back displacement and rotation.Collimation piece 401a is installed with two couples of slip stationary installation 402a, 402b, 402c, 402d, blocks two guide rail 404a, 404b respectively, makes that collimation piece 401a can only be along the orbiting motion of guide rail decision.Main driving wheel 406a is installed on the leading screw 405a, is equipped with from power wheel 407a on the leading screw 405b.Motor 408a is installed on the erecting frame 416; Drive main driving wheel 406a through transmission joint 418a (like belt or chain); Main driving wheel 406a is again through driving from power wheel 407a and position transducer 410a through transmission joint 418b (like belt or chain); Principal and subordinate's power wheel drives leading screw 405a, 405b action synchronously, collimation piece 401a is risen or decline, realizes the scope adjustment wild to ray.
Situation when Fig. 5 has represented that Fig. 2 level is analysed and observe.The guide rail 404 of side-to-side movement collimation piece 401c, 401d is an arc; Make in collimation piece 401c, the 401d motion process; The angle point of its subtended angle remains on ray source point O point place always; The ray field that makes the collimation piece define like this keeps the edge of " precipitous " the most, improves photographic quality and image quality.
Situation when Fig. 6 has represented that Fig. 2 vertically analyses and observe.The guide rail 404 of collimation piece 401a, 401b of moving up and down is arc, makes that in collimation piece 401a, the 401b motion process, the angle point of its subtended angle remains on ray source point O point place always.
Fig. 7 has represented a kind of arrangement of control system.The power supply of system is inserted by power interface 414, is connected with far-end control system 12 through remote communication interface 415, and far-end control device can be the opertaing devices that have man-machine interface able to programme such as PC, PLC, touch-screen.System can carry out work through the mode of this locality control and remote control.Local control mode is directly pressed manual switchgroup 412 through operating personnel; Action naming is directly delivered in the control device 413; The far-end control mode is sent action command through operating personnel on far-end control system 12, send to control device 413 through remote communication interface 415.Control device 413 forms drive current drive motor 408 actions that act on motor through its inner PLC logic determines and motor-drive circuit plate with command conversion after receiving action command, and motor 408 drives collimation piece 401 and position transducer 410 actions simultaneously.Position transducer 410 feeds back to control device 413 with the positional informations of collimation piece 401 in real time, and control device 413 is through judging and arrangement is sent to lever position indicator 411 simultaneously with the positional information of collimation piece 401 and shows with far-end control system 12.When collimation piece 401 moves to extreme position; To touch stop means 409; Stop means 409 arrives control device 413 with corresponding signal feedback; Control device 413 is made and is judged and make motor 408 stop action, and collimation piece 401 position that whether reaches capacity also can be judged through position transducer 410 feedacks.
Fig. 8 has represented the wild example of several kinds of rays that collimating apparatus forms.(A) being is the rectangular field at center with the beam center O; (B) be the rectangular field of not ordering at O in the center; (C) it is wild to be used for the horizontal slot of CT, (D) rectangular field of a quadrant fully relatively, and wherein (B), (D) are in some application scenario; Can be not the center according to the condition specific requirement, carry out wild the defining of ray with the center of beam.
The typical workflow of the present invention is following:
Local control mode: operating personnel directly press manual switchgroup 412, and action naming is delivered in the control device 413 by manual switchgroup 412.Control device 413 forms drive current drive motor 408 actions that act on motor through its inner PLC logic determines and motor-drive circuit plate with command conversion after receiving action command, and motor 408 drives collimation piece 401 and position transducer 410 actions simultaneously.Position transducer 410 feeds back to control device 413 with the positional information of collimation piece 401 in real time; Control device 413 is through judging and arrangement is sent to lever position indicator 411 simultaneously with the positional information of collimation piece 401 and shows with far-end control system 12, but the duty of operator's real-time monitored system wherein.When collimation piece 401 moves to extreme position; To touch stop means 409; Stop means 409 arrives control device 413 with corresponding signal feedback; Control device 413 is made and is judged and make motor 408 stop action, and collimation piece 401 position that whether reaches capacity also can be judged through position transducer 410 feedacks.
The far-end control mode: operating personnel send action command on far-end control system 12, send to control device 413 through remote communication interface 415.Control device 413 forms drive current drive motor 408 actions that act on motor through its inner PLC logic determines and motor-drive circuit plate with command conversion after receiving action command, and motor 408 drives collimation piece 401 and position transducer 410 actions simultaneously.Position transducer 410 feeds back to control device 413 with the positional informations of collimation piece 401 in real time, and control device 413 is through judging and arrangement is sent to lever position indicator 411 simultaneously with the positional information of collimation piece 401 and shows with far-end control system 12.But the duty of operator's real-time monitored system.When collimation piece 401 moves to extreme position; To touch stop means 409; Stop means 409 arrives control device 413 with corresponding signal feedback; Control device 413 is made and is judged and make motor 408 stop action, and collimation piece 401 position that whether reaches capacity also can be judged through position transducer 410 feedacks.
Though the present invention combines an embodiment statement; But those skilled in the art can be to wherein some characteristic appropriate change or apply it to other field solving the problem of radiography aspect in addition, so all relevant expansions of on the basis of present embodiment, carrying out of those skilled in the art and use the protection domain that all should fall into the application.
Claims (10)
1. four remote-controlled part self-movement collimating apparatuss; But it is characterized in that all self-movements of this four part; Wherein every part collimating apparatus includes outer motor, gearing, the transmission joint of collimation piece, stationary installation, guide rail, leading screw and erecting frame shaped as frame structure that is installed in the erecting frame shaped as frame structure, and the shape of said guide rail is the arc that the center overlaps with the ray source point;
Said stationary installation comprises transmission stationary installation and slip stationary installation; Said collimation piece both sides are separately installed with a pair of slip stationary installation; Every pair of slip stationary installation closely contacts with a guide rail that is between them; Can slide between slip stationary installation and the guide rail, in the collimation piece motion process because the effect of slip stationary installation with the orbiting motion of strictness along guide rail;
Said guide rail and leading screw be the edge of mounted in pairs in erecting frame shaped as frame structure respectively; Said collimation piece is installed on the said leading screw through a pair of transmission stationary installation of its both sides; Said transmission stationary installation and leading screw closely cooperate, and leading screw bears the weight of collimation piece through the transmission stationary installation and drives the motion of collimation piece.
2. four remote-controlled part self-movement collimating apparatuss as claimed in claim 1 is characterized in that between said transmission stationary installation and the collimation piece be a kind of flexible connection, make the collimation piece have with respect to the transmission stationary installation and a spot ofly move forward and backward and rotate.
3. four remote-controlled part self-movement collimating apparatuss as claimed in claim 1; It is characterized in that the first collimation piece in four collimation pieces can with the ray be to-and-fro movement in the central point zone up; The second collimation piece can with the ray be to-and-fro movement in the central point zone down; The 3rd collimation piece can with the ray be central point turn left the zone in to-and-fro movement; The 4th collimation piece can be to-and-fro movement in the central point zone of turning right with the ray, thereby makes the motion of four collimation pieces make up and can in 2 dimensional region, define arbitrarily the ray open country.
4. four remote-controlled part self-movement collimating apparatuss as claimed in claim 1 is characterized in that said collimation piece displacement general is not the center with the center of beam, carries out wild the defining of eccentric ray.
5. like claim 1 or 3 described four remote-controlled part self-movement collimating apparatuss; It is characterized in that said collimation piece is in motion process; The angle point of the wild subtended angle of the ray that constitutes remains on ray source point O point place always, thereby the ray field that the collimation piece is defined keeps the edge of " precipitous " the most.
6. four remote-controlled part self-movement collimating apparatuss as claimed in claim 1; It is characterized in that in the erecting frame shaped as frame structure stop means being installed also; Said stop means mounted in pairs is inboard in erecting frame shaped as frame structure; When the collimation piece moved to the extreme position of system specialization, the collimation block edge touched stop means.
7. four remote-controlled part self-movement collimating apparatuss as claimed in claim 1 is characterized in that erecting frame shaped as frame structure also is equipped with display device, manual switchgroup, control device, power interface, remote communication interface and far-end control system outward.
8. four remote-controlled part self-movement collimating apparatuss as claimed in claim 7 is characterized in that through said display device, and information feedback can controlled and obtain in real time to manual switchgroup and control device nearby to the motion of each collimation piece.
9. four remote-controlled part self-movement collimating apparatuss as claimed in claim 1; It is characterized in that also being provided with remote communication interface and far-end control system; Said remote communication interface is installed in outside the erecting frame shaped as frame structure; Carry out communication with far-end control system and be connected, make the motion of each collimation piece operate, and obtain the feedback of positional information in real time at far-end control system.
10. four remote-controlled part self-movement collimating apparatuss as claimed in claim 7; It is characterized in that said remote communication interface and far-end control system carry out communication and be connected; Make the motion of each collimation piece operate, and obtain the feedback of positional information in real time at far-end control system.
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| CN2007101184318A CN101339819B (en) | 2007-07-05 | 2007-07-05 | Remote controllable collimator with four parts independently moving |
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| CN2007101184318A CN101339819B (en) | 2007-07-05 | 2007-07-05 | Remote controllable collimator with four parts independently moving |
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| CN108020569B (en) * | 2018-01-18 | 2023-11-21 | 中国工程物理研究院应用电子学研究所 | Collimation device and CT machine comprising same |
| CN108827984A (en) * | 2018-06-12 | 2018-11-16 | 中国原子能科学研究院 | A kind of alternating expression irradiation field zoom collimator |
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| CN113063807A (en) * | 2021-03-12 | 2021-07-02 | 梅特勒-托利多(常州)测量技术有限公司 | Ray light field adjusting mechanism and ray imaging device |
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| CN2514851Y (en) * | 2001-10-19 | 2002-10-09 | 深圳市一体智能技术有限公司 | Composite moving multivane collimator |
| CN1569275A (en) * | 2004-04-29 | 2005-01-26 | 杭州华源伽玛医疗设备投资有限公司 | Gamma ray radiation device |
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| CN1178711A (en) * | 1997-09-17 | 1998-04-15 | 戴建荣 | Use of independent collimator in adaptive radiotherapy |
| CN2514851Y (en) * | 2001-10-19 | 2002-10-09 | 深圳市一体智能技术有限公司 | Composite moving multivane collimator |
| CN1569275A (en) * | 2004-04-29 | 2005-01-26 | 杭州华源伽玛医疗设备投资有限公司 | Gamma ray radiation device |
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| CN101339819A (en) | 2009-01-07 |
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