31 results about "Electron linear accelerator" patented technology

The present invention relates to a device-produced medical isotope 225 Photonuclear reaction preparation in Ac production technology 225 Ac radium target design, specifically involving a method for producing 225 Ac's 226 Ra isotope target and its application. 226 The Ra isotope target comprises a nickel substrate, 226 Ra isotope sample, nickel electroplating layer and nickel protective shell; wherein, 226 The Ra isotope sample is evenly concentrated in the center of the nickel substrate, and the nickel electroplating layer covers 226 The outer surface of the Ra isotope sample, and the nickel substrate and nickel electroplating layer will 226 The Ra isotope sample is wrapped in the middle; the nickel protective shell wraps the nickel electroplating layer. 226 Ra isotope targets can be used in electron linear accelerators as a photonuclear reaction production 225 Ac raw material target, can improve 225 Production of Ac isotopes.

The application discloses a quality control system and method of a medical electronic linear accelerator, and the quality control system comprises the following: an upper computer, an industrial computer, an MLC positioning accuracy module, a gantry angle detection module, a treatment bed positioning accuracy detection module, an ARM motion control positioning accuracy module and a CBCT motion control positioning accuracy module; the upper computer generates a quality control report according to the detection results collected by the MLC positioning accuracy module, the gantry angle detection module, the treatment bed positioning accuracy detection module, the ARM motion control positioning accuracy module and the CBCT motion control positioning accuracy module. The application can effectively reduce the time required for periodic detection of the medical electronic linear accelerator, reduce the manpower and material resources required in the detection process, realize complete multiple quality control plans, issue a quality control report, and accurately and intuitively express the quality inspection result.

A radiation dose rate control method, which relates to the technology of radiation, and an accelerator (100). The control method is used for an electron linear accelerator (100) comprising a microwave source, an electron gun (102) and an accelerating tube (104). The control method comprises: when an electron linear accelerator (100) outputs a beam, monitoring a first event used for indicating a change of a beam output parameter (S610), wherein the beam output parameter comprises a pulse of an electron gun (102) and a microwave power of a microwave source, and the first event is determined by means of radiation protection requirements; and in response to monitoring the first event, cutting off the pulse of the electron gun (102), and switching a first microwave power of the microwave source to a second microwave power, so that the leakage dose rate of a radiation safety boundary is less than or equal to a first preset threshold (S620), wherein the level of dark current in an accelerating tube (104) under the second microwave power is less than or equal to a second preset threshold. Further provided are a radiation dose rate control apparatus, an accelerator (100), and a radiation apparatus.

The utility model relates to the field of quality control of medical electron linear accelerators. Multi-dimensional radiotherapy dose measuring equipment comprises a multifunctional water tank, mounting grooves arranged in a matrix mode are formed in a bottom plate of the multifunctional water tank, the mounting grooves are used for placing thermoluminescence dosimeters, and film slots used for inserting films are formed in the bottom of the inner wall of the multifunctional water tank; three mounting holes with different heights are formed in a side plate of the multifunctional water tank, the mounting holes are used for being in butt joint with an ionization chamber plug or a water tank plug, and the water tank plug is used for blocking the mounting holes; the ionization chamber plug is used for installing the ionization chamber, and a through hole for inserting the ionization chamber is formed in the ionization chamber plug; the thermoluminescence dosimeter box further comprises a bearing bottom plate, bearing grooves distributed in a matrix mode are formed in the bearing bottom plate, and the bearing grooves are used for containing thermoluminescence dosimeters. By optimizing the structure of the water tank, compared with a traditional one-dimensional water tank, the dose measurement dimensionality is greatly improved.

This invention relates to an extreme ultraviolet (EUV) light source device, comprising a seed laser generator, an electron source, an electron linear accelerator, a first modulation section, a first dispersion section, a second modulation section, a second dispersion section, and an amplifier. A first electron beam generated by the electron source is accelerated by the electron linear accelerator to form a second electron beam. The seed laser generator generates a seed laser, and both the seed laser and the second electron beam are injected into the first modulation section to induce a first energy modulation in the second electron beam, resulting in a third electron beam. The first dispersion section compresses the third electron beam to form a fourth electron beam. The second modulation section induces coherent radiation in the fourth electron beam, which is then subjected to a second energy modulation by the coherent radiation to form a fifth electron beam. The second dispersion section compresses the fifth electron beam to form a sixth electron beam. The amplifier causes the sixth electron beam to radiate and emit kilowatt-level EUV light. The EUV light source device of this invention can generate EUV light with an average power in the kilowatt range and has a compact structure.

The invention discloses a klystron residual life prediction system and a klystron residual life prediction method, belongs to the technical field of electron linear accelerators, and aims to solve the problems that no method for predicting the klystron residual life exists, maintenance and replacement are often carried out when the klystron cannot work suddenly, and stocking / replacement of the klystron needs a quite long time, so that the klystron is inconvenient to use. The system comprises a data acquisition unit, a data transmission unit, a data storage unit, a data operation unit and a data output unit. By collecting and analyzing the key operation data of the klystron, the residual life of the klystron can be predicted more accurately, and maintenance or replacement plan errors caused by inaccurate prediction are avoided; by making a maintenance or replacement plan in advance, the shutdown time of equipment caused by sudden failure of the klystron can be shortened, so that economic loss caused by shutdown is reduced, and meanwhile, reasonable spare part inventory management can also avoid extra cost caused by insufficient spare parts or untimely replacement.

The utility model provides a superconducting electron linear accelerator device for isotope production, which comprises an injector, a superconducting acceleration module and an irradiation target area which are arranged in sequence, and the superconducting acceleration module is connected with a low-temperature cooling system, a radio frequency driving system and a control system; the superconducting acceleration module comprises a low-beta-value Ni3Sn superconducting cavity and five standard Ni3Sn superconducting cavity modules, the low-beta-value superconducting cavity is an SRF acceleration cavity of a 2-cell cavity with beta = 0.7, and each standard superconducting cavity module consists of four SRF acceleration cavities of the 2-cell cavity with beta = 1 which are connected in series; and the input end of the standard superconducting cavity module adopts a symmetrical double-input coupler. According to the linear accelerator device provided by the utility model, the Ni3Sn superconducting cavity adopts a 2-cell and double-input coupler structure, so that the power requirement of high-power input coupling can be reduced under high flow intensity, a high-power electron beam is generated at lower cost, and efficient and economic production of isotopes is realized.

The present application provides a radiotherapy device belonging to the field of medical device technology, comprising a base, a first bedboard assembly and an electron linear accelerator disposed on the base, a second bedboard assembly disposed at an end of the first bedboard assembly, and a head fixation assembly and a torso fixation assembly disposed on the second bedboard assembly, wherein the electron linear accelerator is configured to emit X-rays. The radiotherapy bed of the radiotherapy device is composed of a first bedboard assembly and a second bedboard assembly, wherein the back support plate and the head support plate of the second bedboard assembly are positionally adjustable. During use, adjacent back support plates can be aligned with each other or form a first avoidance gap, and the head support plate can be aligned with adjacent back support plates or form a second avoidance gap, so that the tumor or surgical wound of the radiotherapy patient is located within the avoidance gap, thereby avoiding squeezing the patient's tumor or wound.

The invention relates to a device for producing radionuclides, in particular diagnostic and therapeutic radionuclides, on the basis of the principle of photo-nuclear radiation, comprising an electron accelerator (1), which generates an electron beam (2) with temporal structural features for the linear electron accelerator (1), a converter target assembly (21), which is arranged between the electron accelerator (1) and the converter target assembly (21), the invention relates to a converter target assembly (21) for generating radionuclides, comprising a converter target (20) for converting the electron beam (2) into bremsstrahlung photons (15), a plurality of production targets (17) irradiated by the bremsstrahlung photons (15) in order to generate the radionuclides, the converter target assembly (21) comprising a sealed housing (9) enclosing a cavity (19) accommodating the converter target (20), comprising an entrance window with a window disk (23) for the electron beam (2) and an exit window for the bremsstrahlung photons (15), comprising cooling medium ports (10) which are part of a cooling circuit (11) for establishing a cooling flow through the cavity (19) in order to cool the converter target (20) and the window disk (23), the converter target (20) comprises a plurality of rotatable converter discs (12), the electron beams (2) are arranged off-center with respect to the respective converter discs (12), and wherein the respective converter discs (12) are designed to rotate during operation of the device such that the converter discs (12) are arranged on the converter target (20) over time. The focus of the electron beam (2) is dispersed onto an annular region (14) of the converter disk (12) in multiple rotations.

The application discloses an output self-correction circuit for a medical electron gun grid power supply, comprising a low-voltage side control unit, an isolation transmission unit, a high-voltage side control unit, a grid power supply and an independent sampling network; the low-voltage side control unit receives a dose rate, an ambient temperature, an external sampling signal and an output voltage feedback signal, generates a corrected reference signal and transmits the corrected reference signal to the high-voltage side control unit through the isolation transmission unit; the high-voltage side control unit outputs a control increment to the grid power supply after F / V conversion of the corrected reference signal, simultaneously receives voltage feedback signals of the grid power supply and the independent sampling network, and transmits the voltage feedback signals to the low-voltage side control unit through the isolation transmission unit; the application provides the grid power supply with output self-correction for a medical electron linear accelerator, realizes long-term stability and parameter consistency of an electron gun emission beam current, does not need manual correction, and greatly improves work efficiency.

A radiation dose rate control method, which relates to the technology of radiation, and an accelerator (100). The control method is used for an electron linear accelerator (100) comprising a microwave source, an electron gun (102) and an accelerating tube (104). The control method comprises: when an electron linear accelerator (100) outputs a beam, monitoring a first event used for indicating a change of a beam output parameter (S610), wherein the beam output parameter comprises a pulse of an electron gun (102) and a microwave power of a microwave source, and the first event is determined by means of radiation protection requirements; and in response to monitoring the first event, cutting off the pulse of the electron gun (102), and switching a first microwave power of the microwave source to a second microwave power, so that the leakage dose rate of a radiation safety boundary is less than or equal to a first preset threshold (S620), wherein the level of dark current in an accelerating tube (104) under the second microwave power is less than or equal to a second preset threshold. Further provided are a radiation dose rate control apparatus, an accelerator (100), and a radiation apparatus.

The invention belongs to the technical field of parameter verification, and discloses a medical electron linear accelerator mechanical parameter verification method and system, and the method comprises the steps: obtaining a log file of the single use of a linear accelerator, extracting the actually executed mechanical parameters, and forming an actual execution sequence set; obtaining a plan file, extracting expected mechanical parameters, and forming an expected sequence set; obtaining a historical use record, and generating a self-adaptive tolerance standard; judging whether each mechanical parameter is qualified or not by applying a self-adaptive tolerance standard; calculating an actual execution dose distribution when at least one mechanical parameter is unqualified; and comparing the actually executed dose distribution difference with the original planned dose distribution difference, and generating a dose deviation evaluation report. Sensitivity differences of different treatment parts on various mechanical parameter deviations are considered through a self-adaptive tolerance standard, full-chain analysis from the mechanical parameter deviations to dose influences is achieved, and the accuracy and effectiveness of mechanical parameter verification are improved.

The utility model discloses an electron linear accelerator frame with a self-shielding device, which comprises a base, a sliding rail is arranged at the upper end of the base, a sliding seat is connected in the sliding rail in a sliding manner, and a moving mechanism for moving the sliding seat is arranged on the base; a bed body is fixedly mounted at the upper end of the sliding seat, a sliding cavity is formed in the upper end of the bed body, two protection plates are symmetrically arranged in the sliding cavity, and a rotating mechanism used for rotating the two protection plates is arranged in the bed body. According to the utility model, the stable and accurate rotation of the protection plate is realized, so that the radiation generated by the electron linear accelerator can be quickly and effectively shielded, and meanwhile, the rack is also provided with a flexible sliding seat design, so that the bed body can horizontally move to a required position, and accurate experiment or treatment operation can be conveniently carried out. The design not only improves the shielding efficiency and the cost effectiveness, but also enhances the flexibility and the operation convenience of the equipment.

The application discloses a dose control device and method of a medical electronic linear accelerator, which comprises an electronic pulse generator, a microwave pulse generator, a control computer, a trigger pulse generator, a counting frequency divider, a dose counter, a switch, a first circuit, a second circuit and an ionization chamber; the output end of the trigger pulse generator is in communication connection with the input end of the dose counter through the counting frequency divider, the output end of the dose counter is in communication connection with the input end of the switch, and the output end of the switch is in communication connection with the input end of the electronic pulse generator through the first circuit; the output end of the trigger pulse generator is also in communication connection with the input end of the switch; and the output end of the trigger pulse generator is also in communication connection with the input end of the microwave pulse generator through the second circuit. The application has the advantages of simple structure, high reliability and the ability to realize meticulous, more accurate and more balanced dose distribution.

The invention provides an electron linear accelerator laser feed-in structure, which comprises a fixed base and a vacuum chamber, and is characterized in that the vacuum chamber is provided with a first port and a second port; the three third ports are distributed on the left side, the right side and the upper side of the vacuum chamber; the observation window assemblies are arranged on the third ports, and horizontal adjusting plates are arranged in the two third ports located on the left side and the right side and installed on the third ports; the transverse position adjusting plate is mounted on the horizontal adjusting plate; the angle direction adjusting plate is mounted on the transverse position adjusting plate, and an included angle is formed between the angle direction adjusting plate and the transverse position adjusting plate; the lenses are installed on the side, close to the first port, of the angle direction adjusting plate, and a beam bunch channel allowing an electron beam bunch to penetrate through is formed between the two lenses on the two opposite third ports; and external laser is emitted to the lens from one of the third ports provided with the lens. According to the invention, the influence caused by mechanical processing accumulative errors can be effectively compensated, and the adjustment convenience of the laser feed-in circuit is improved.

The present invention provides an EPID-based detection method, device, equipment and medium for an electron linear accelerator, relating to the field of electron linear accelerator detection; the method includes the following steps: collecting multiple EPID images of an EPID irradiating a target object multiple times, and taking each of the EPID images as a target image; calculating the MU linear value of the electron linear accelerator based on the multiple target images, and calculating the field flatness value and the field symmetry value of the electron linear accelerator based on a single target image; determining whether the MU linear value, the field flatness value and the field symmetry value are respectively within their corresponding set requirement ranges; applying the imaging function of the EPID system to the daily detection of the electron linear accelerator, greatly improving the daily detection efficiency of the electron linear accelerator, eliminating the need to rely on additional purchased quality control equipment, and reducing the cost of daily detection.

The utility model relates to a low-position transportation protection device which is characterized in that one end of a medical electron linear accelerator is detachably connected with a low-position roller device through a plurality of third screws, and the other end of the medical electron linear accelerator is detachably connected with a low-position welding support through a first screw. The low-position welding support is detachably connected with the electric tank through a second screw, and the medical electron linear accelerator is lifted away from the ground and can be moved and transferred. The height of the gravity center of the medical electron linear accelerator can be reduced in the transportation process, and the medical electron linear accelerator can pass through a door opening with the height of 2000 mm under the condition that the levelness and the flatness of the ground are very high.

The utility model relates to the technical field of medical electron linear accelerators, in particular to a primary collimator suitable for an electron linear accelerator, which comprises a target unit, a primary collimator upper unit, a primary collimator lower unit, a flattening device and an ionization chamber which are sequentially arranged from top to bottom along a central axis, and a ray target is mounted in the target unit. According to the utility model, the primary collimator is adopted to replace the original primary and secondary collimators, so that the function of converting a circular radiation field into a square radiation field is realized, the space of the machine head is saved, the treatment space can be effectively increased by 10cm or more, the radiation leakage probability and the protection design difficulty caused by cascade connection are reduced, and the leakage rate of the machine head can be reduced to below 0.1%; the problems of insufficient treatment space, increased radiation leakage and the like caused by a two-stage three-layer structure of the primary collimator and the secondary collimator are solved.

The application discloses a medical particle accelerator magnet vacuum device and belongs to the technical field of magnet vacuum devices. The medical particle accelerator magnet vacuum device comprises a vacuum cylinder, a vacuum cavity is formed in the inner side of the vacuum cylinder, and a filtering assembly, an electron acceleration tube, a sealing assembly and a movable focusing assembly are sequentially arranged in the inner side of the vacuum cavity. The application solves the problem that the focusing structure of a common electron linear accelerator is a fixed structure and cannot be moved, so that the diameter of a particle beam cannot be controlled and adjusted by adjusting the position of the focusing structure. Moreover, the existing electron beam observation structure cannot obviously and intuitively observe the electron beam. In the application, part of the magnetic field generated by the focusing electromagnetic coil II interferes with the electron beam in the vacuum cavity through the magnetic permeable groove and the matching groove, so that the electron beam is focused. The relative position of the magnetic field and the electron beam is adjusted by adjusting the relative position of the matching groove and the magnetic permeable groove.

The application provides a method for installing solenoid of an electron linear accelerator, which comprises the following steps: setting a front stand; setting a middle stand for installing at least one component of the front part in the rear section and a solenoid focusing assembly, wherein the solenoid focusing assembly is slidably arranged on the middle stand; setting a rear stand for installing an accelerating tube assembly; when replacing the solenoid, removing all the components of the front part on the middle stand and the support seat thereon, moving the solenoid focusing assembly towards the front stand to make the solenoid out of the accelerating tube; assembling a new solenoid into the solenoid focusing assembly and moving the solenoid focusing assembly towards the rear stand to make the solenoid into the accelerating tube; then, assembling the support seat on the middle stand; and installing the removed components on the middle stand and performing system collimation.

The invention discloses a blade heat conduction analysis method based on an electron linear accelerator CT system, and the method comprises the steps: carrying out the bright / dark field correction of a CT imaging system after the electron linear accelerator CT system is preheated and aged; performing cone beam scanning on the to-be-detected blade to obtain a DR scanning data set of the blade; reconstructing the DR scanning data set of the workpiece into a two-dimensional CT fault data set of the blade and a three-dimensional voxel model of the blade by using an image reconstruction system; any two layers of parallel two-dimensional fault diagrams of the blade are designated as inlet and outlet positions of thermal conductivity analysis, and a region range of thermal conductivity analysis is generated; setting a thermal conductivity parameter of a blade material and a relative temperature difference between an inlet position and an outlet position, setting a convergence error and the maximum number of iterations, and automatically analyzing the thermal conductivity of the blade to form a convergence graph; the thermal conductivity analysis result is displayed, and the detection requirements for the large-size aero-engine turbine blade complex three-dimensional structure and thermal conductivity analysis are met.

The embodiment of the present application provides a mobile flaw detection system, the mobile flaw detection system comprises a track moving device, a driving device and an electron linear accelerator, the track moving device comprises a track and a moving vehicle, the track extends along a first direction, and the track is used for carrying the moving vehicle so that the moving vehicle can move along the first direction; the driving device is arranged on the moving vehicle, the driving device comprises a first driving assembly and a second driving assembly, the second driving assembly is drivingly connected with a driving part of the first driving assembly, so as to drive the second driving assembly to move along a second direction; the electron linear accelerator is drivingly connected with the driving part of the second driving assembly, so as to drive the electron linear accelerator to move along a third direction, and the first direction, the second direction and the third direction intersect with each other. The mobile flaw detection system in the embodiment of the present application realizes the purpose that the electron linear accelerator moves arbitrarily in a three-dimensional space; by adopting the track carrying mode, it is beneficial to install the electron linear accelerator with large size and large weight.

The application discloses a magnetic lens for an electronic linear accelerator and a structure optimization method, and the structure optimization method comprises the following steps: obtaining structure parameters of the magnetic lens; calculating a magnetic field intensity vector of the magnetic lens; obtaining a corresponding relationship between the structure parameters of the magnetic lens and the magnetic field intensity of the magnetic lens by using the magnetic field intensity vector; and optimizing the structure of the magnetic lens according to the corresponding relationship. The application can improve the maximum magnetic field of the magnetic lens, improve the focusing effect of the magnetic lens, reduce the size of an initial beam spot, provide a data basis for product research and development, and reduce the cost of product research and development.

The utility model discloses a limit rotation device of medical electron linear accelerator, relates to medical electron accelerator technical field, including frame, rotation mechanism, drive mechanism and limit mechanism, the frame is rotatingly connected with the rotation mechanism through bearing, drive mechanism and limit mechanism both are fixedly installed on the frame; the driving mechanism is connected with the rotating mechanism and is used for driving the rotating mechanism to rotate; the limiting mechanism is close to the rotating mechanism, and when the rotating mechanism makes contact with the limiting mechanism, the limiting mechanism is used for limiting rotation of the rotating mechanism. The driving mechanism solves the technical problems that a driving mechanism of an electron linear accelerator rotating device is low in transmission power and prone to abrasion, and a traditional limiting mechanism is small in limiting angle and free of buffering during limiting. The limiting rotation device is simple in structure, not easy to wear and large in limiting mechanism.

The invention relates to the technical field of aquaculture tail water treatment, and discloses a marine product aquaculture tail water decontamination and discharge device and method based on an electron linear accelerator, the marine product aquaculture tail water decontamination and discharge device comprises a power mechanism, the power mechanism further comprises a pipeline, the inner wall of the pipeline is rotatably connected with a rotating rod, and the rotating rod is rotatably connected with the electron linear accelerator. A plurality of rotating plates are fixedly connected to the outer wall of the rotating rod, a plurality of fixing cylinders are rotationally connected to the outer wall of the rotating rod, and by means of the characteristic that an arc-shaped push plate pushes sewage to enable an electron linear accelerator to fully irradiate the whole sewage, a pipeline is installed in an area capable of being irradiated by the electron linear accelerator; then a motor is started to drive a first bevel gear to rotate, a second bevel gear is made to rotate through gear transmission, then a rotating rod is made to rotate, the rotating rod rotates to drive a rotating plate to rotate, the interior of the sewage is stirred through rotation of the rotating plate, the sewage is turned over, and when the rotating plate rotates, an extrusion block is driven to rotate, and an arc-shaped push plate is extruded by the extrusion block.

The present disclosure provides an irradiation dose rate control method, which relates to the field of irradiation technology, the field of accelerators, or other fields. The method is used for an electron linear accelerator including a microwave source, an electron gun, and an accelerating tube, and includes: when the electron linear accelerator emits a beam, monitoring a first event for indicating a change in beam parameters, wherein the beam parameters include the pulse of the electron gun and the microwave power of the microwave source, and the first event is determined by the irradiation protection requirements; in response to monitoring the first event, cutting off the pulse of the electron gun and switching the first microwave power of the microwave source to a second microwave power, so that the leakage dose rate of the irradiation safety margin is less than or equal to a first preset threshold; wherein, at the second microwave power, the dark current level in the accelerating tube is less than or equal to a second preset threshold. The present disclosure also provides an irradiation dose rate control device, an accelerator, and an irradiation device.

Systems, methods, and apparatus are described for a laser pulse generation system including at least one electron linear accelerator configured to accelerate electrons from an electron source, a first undulator arranged along a first electron beam path and configured to cause electrons moving along the first electron beam path through the first undulator to emit a first electromagnetic emission, an optical cavity at least partially overlapping with the first undulator and configured to confine the first electromagnetic emission within the optical cavity along a first optical path, and a second undulator arranged along a second electron beam path different from the first electron beam path, the second undulator being configured to cause electrons moving along the second electron beam path to emit a second electromagnetic emission.

The invention relates to a target arrangement for generating X-ray radiation, an electron linear accelerator and a fixed anode transmission-type X-ray tube. The invention relates to a target arrangement for generating X-ray radiation, comprising: a heat sink; and-a target element for electron bombardment, said target element being embedded in a cooling body in order to cool the target element and being structurally distinguishable from the cooling body, characterized in that the target element has a subdivided structure that differs from the cylindrical shape.

The invention provides a solenoid installation method of an electron linear accelerator. The solenoid installation method comprises the following steps that a front rack is arranged; a middle rack is arranged and used for installing at least one assembly located on the rear section of the front part and a solenoid bunching assembly, and the solenoid bunching assembly is arranged on the middle rack in a sliding mode; a rear section rack is arranged and used for installing an accelerating tube assembly; when the solenoids are replaced, all assemblies belonging to the front-arranged component on the middle rack and supporting seats on the assemblies are disassembled, and the solenoid bunching assemblies are moved in the direction close to the front-arranged rack, so that the solenoids are separated out of the accelerating tube; a new solenoid is assembled into the solenoid bunching assembly, and the solenoid bunching assembly is pushed to move in the direction close to the rear section rack, so that the accelerating tube is sleeved with the solenoid; a supporting seat on the middle rack is mounted; and the components dismounted from the middle rack are mounted, and system collimation is carried out. When the solenoid is installed and replaced, the number of detached parts is small, and the assembling efficiency is higher.

The invention discloses a shaping collimation structure and an electron linear acceleration device, and relates to the field of electron linear accelerators. The shaping collimator is used for shaping and collimating rays emitted by the ray source assembly; the shaping collimation structure comprises a support and a plurality of collimators, and the plurality of collimators are arranged on the support and distributed around a preset axis; the plurality of collimation parts are enclosed around a preset axis to form a collimation channel, and the collimation channel is used for shaping and collimating rays emitted by the ray source assembly; and the plurality of collimation pieces can move relative to the bracket so as to change the size of the cross section of the collimation channel. By applying the shaping and collimating structure disclosed by the invention, the shape and the size of the section of the ray beam emitted by the collimating channel can be flexibly adjusted, so that the adaptability of the shaping and collimating structure is improved.