CN103203079A - Double-modulator control system of medical electron linear accelerator - Google Patents
Double-modulator control system of medical electron linear accelerator Download PDFInfo
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- CN103203079A CN103203079A CN2013100995138A CN201310099513A CN103203079A CN 103203079 A CN103203079 A CN 103203079A CN 2013100995138 A CN2013100995138 A CN 2013100995138A CN 201310099513 A CN201310099513 A CN 201310099513A CN 103203079 A CN103203079 A CN 103203079A
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Abstract
The invention discloses a double-modulator control system of a medical electron linear accelerator. The double-modulator control system comprises a magnetron modulator, a grid-controlled electron gun modulator, a magnetron, a grid-controlled electron gun, an accelerating tube, three microwave detection circuits, a feedback microwave system, a therapeutic head, an automatic dosage control system and a digital signal processing system; the digital signal processing system is connected with the magnetron modulator and the grid-controlled electron gun modulator respectively, the magnetron modulator is connected with the magnetron, a microwave detection circuit is connected between the magnetron and the feedback microwave system, and the other two microwave detection circuits are connected between the inlet and the outlet of the accelerating tube and the feedback microwave system respectively; and the magnetron modulator, the three microwave detection circuits and the automatic dosage control system are connected with the digital signal processing system respectively, and the electron gun modulator is sequentially connected with the grid-controlled electron gun, the accelerating tube and the therapeutic head. The double-modulator control system realizes independent control, and can dynamically adjust the emission capacity of the electron gun in real time.
Description
Technical field
The present invention relates to medical electronic linear accelerator, be specifically related to the manipulator of medical electronic linear accelerator, belong to medical electronic linear accelerator control technology field
Background technology
Medical accelerator refers to be specifically designed to clinical medical accelerator, the representative of current medical accelerator is medical electronic linear accelerator, medical electronic linear accelerator is not only maximum a kind of of platform number in the accelerator, also be maximum a kind of of platform number in the various radiotherapy units, medical electronic linear accelerator is topmost radiotherapy unit.
Using microwave electric field to accelerate in the accelerator of electronics, in order to obtain high as far as possible accelerating field, instantaneous microwave power is very big, reaches the MW magnitude, so microwave source all is pulsed operation, and pulse-modulator is the power supply that pulse power is provided to this microwave source.The task of microwave source is the hyperfrequency vibration that generation and output have certain frequency, certain pulse envelope width, certain repetition rate, a certain size power.Except frequency of oscillation is to be determined by magnetron, outside repetition rate was determined by trigger, pulse width and pulse power were determined by manipulator.This shows, the task of manipulator be a series of agitators of output required have enough powerful, certain repetition rate and certain width, a pulse voltage that waveform is suitable.
In electron linear accelerator, except above-mentioned magnetron oscillator need be provided the pulse voltage by pulse-modulator, the injection of electronics also requires the pulse voltage of certain waveform, pulse amplitude.Because it is very light that electronics injects one tunnel load, so usually share a manipulator with magnetron oscillator, two groups of coils of pulse transformer secondary provide the two-way pulse voltage that repetition rate is identical with pulse width, amplitude is different.
Magnetron and grided electron gun share the problem that there are following several respects in actual use in a manipulator at present:
When (1) the positive grid voltage pulse of grid-control power supply and rifle high-voltage pulse are synthetic, can not cause the grid voltage pulse shape at high-voltage pulse top not right fully synchronously, be constituted by three pulses, be unfavorable for the correct control of electron gun line.
When (2) high-voltage pulse and positive grid voltage pulse are synthetic, the radio-frequency component in high-voltage pulse forward position is quite abundant, it is very big to align the grid voltage impulse disturbances, cause positive grid pulse when the high pressure of high-voltage pulse only rises to 1250V, just be subjected to serious interference, grid pulse top vibration severe overweight, when the high pressure of high-voltage pulse rises to 40kV, the vibration of positive grid voltage pulse top reaches ± 300V about, the span of control that surpasses the grid-control power supply fully, grided electron gun is in abnormal working position, the line of emission is no matter be that shape or intensity all do not meet system requirements, cause when reality is used, satisfying by the heater current that improves electron gun the requirement of system, shortened the service life of electron gun greatly.In addition, this high fdrequency component is delivered to each low voltage control system of system by grid-control power supply (AIC system and master control system communication cable), causes the system communication shakiness.
(3) structures shape of electron gun have certain distribution capacity between the cathode grid assembly of electron gun and the anode, this electric capacity is coupled to the electron gun grid with high-voltage pulse, cause the preceding 1 μ s of each grid pulse can not control the emission line substantially, make wire harnesses stream be difficult to accurately control and adjust to best state.
(4) magnetron high pressure, electron gun high-voltage pulse are together with a pulse transformer, the tailing edge of high voltage pulse is subjected to the magnetron characteristic limitations to cause growing very much (more than the 8 μ s), do not possess the tailing edge cutting function in the modulator again, still do not have mature technique tailing edge is cut for the so big high-voltage pulse of tailing edge composition is domestic in addition.
(5) because of with a pulse transformer, the high voltage pulse amplitude of grided electron gun is limited by the magnetron duty, can not provide the required high pressure of electron gun separately, and the high pressure that obtains can't reach electron gun assigned work state.Cause electron gun emission line little, when reality is used, satisfy the requirement of system by the heater current that improves electron gun, shortened the service life of electron gun greatly.In addition, the line initial velocity of electron gun emission is uncontrollable, is difficult to satisfy the controlled specification requirement of line initial velocity for injection accelerating tube inner chamber of super wide energy range medical electronic linear accelerator.
Summary of the invention
In view of this, the invention provides a kind of dual-modulator control system of medical electronic linear accelerator, utilize digital information processing system control two to overlap high voltage modulators and give the power supply of magnetron and grided electron gun respectively, possess the characteristic of independent control, Real-time and Dynamic adjustment electron gun emissivities, emission specific waveforms line and assurance transmitted beam current control precision.
The dual-modulator control system of medical electronic linear accelerator comprises digital information processing system, magnetron manipulator, grided electron gun manipulator, magnetron, grided electron gun, accelerating tube, three microwave testing circuits, reaction type microwave system, treatment head and automatic dosage control system;
Wherein, digital information processing system sends control signal to magnetron manipulator and electron gun manipulator respectively and controls, digital information processing system receives the high voltage ignition signal of magnetron manipulator respectively, the high-tension current signal, the high pressure amplitude signal, three road microwave envelope signals of microwave testing circuit output, the dose rate signal of automatic dosage control system output, digital information processing system carries out above signal to provide high voltage ignition signal after the integrated treatment, the rifle high pressure, back bias voltage, positive grid voltage, positive grid voltage pulse width, heater current, repetition rate, the control signal of pulsewidth forward position time delay, above control signal control grided electron gun is launched line during the microwave envelope of appointment, send the electronic beam current that meets system requirements for grided electron gun; The work of control electron gun manipulator makes the electron gun manipulator produce the coherent signal that grided electron gun needs; Digital information processing system control magnetron manipulator produces a high-voltage pulse signal and offers magnetron, makes magnetron work and produces the microwave of system requirements; It is synthetic that the remaining microwave of microwave and accelerating tube use back that the reaction type microwave system produces magnetron carries out effective power, produces the microwave that is higher than the magnetron output; Accelerating tube accelerates to the electronic beam current of grided electron gun emission the energy of appointment with line under the control of each subsystem; The line that treatment head will speed up the different-energy of pipe output changes into the electronics line or the X ray that meet medical index and under the control of limit beam system the patient is treated; The dosage control treatment time that the close rate of automatic dosage control system sense radiation and statistics patient obtain; Three microwave testing circuits detect the microwave signal of accelerating tube entrance, outlet and magnetron output respectively;
The internal system annexation: digital information processing system connects magnetron manipulator and electron gun manipulator respectively, the magnetron manipulator connects magnetron, be connected with a microwave testing circuit between magnetron and the reaction type microwave system, all the other two microwave testing circuits are connected between accelerating tube entrance and exit and the reaction type microwave system; Magnetron manipulator, three road microwave testing circuits are connected with digital information processing system respectively with the automatic dosage control system, and the electron gun manipulator connects grided electron gun, accelerating tube and treatment head successively.
Work process: digital information processing system control magnetron manipulator produces a high-voltage pulse signal and offers magnetron, magnetron work also produces microwave, it is synthetic to carry out power after microwave uses the remaining microwave in back by phase shift with accelerating tube in the reaction type microwave system, the microwave that generation is different from magnetron output injects accelerating tube, this microwave accelerates the electronic beam current that electron gun is injected in the accelerating tube in accelerating tube, and the electronics after the acceleration converts medical ray to through the treatment head; The intensity of the ionization chamber sense radiation in the treatment head is given the automatic dosage control system, this system delivers to signal processing system after to the transmitted intensity signal processing, three microwave testing circuits are exported detected magnetron the envelope of microwave signal respectively, the envelope of the envelope of accelerating tube entrance microwave signal and accelerating tube outlet microwave signal is delivered to digital information processing system respectively, the magnetron manipulator is with high voltage ignition signal, the high-tension current signal, the high pressure amplitude signal is delivered to digital information processing system, seven signals that digital information processing system will receive and the rifle high pressure of from the electron gun manipulator, gathering, back bias voltage, four signals of line of positive grid voltage and grided electron gun emission are analyzed the back and are produced eight control signals, produce the control signal of control grid-control electron gun filament size of current, the control signal of control grided electron gun rifle high pressure size, the control signal of back bias voltage size, the control signal of positive grid voltage size, the control signal of positive grid voltage pulse width, positive grid voltage pulse front edge delay control signal, positive grid voltage repetition rate control signal and positive grid voltage start control signal; Digital information processing system is given the electron gun manipulator with above eight control signals, and electron gun modulator control grided electron gun sends the electronic beam current that meets system requirements.
The high-voltage pulse signal that the magnetron manipulator produces is 10KV～55KV, and repetition 100～400HZ, pulsewidth 2.8-4.3 μ s, top fall less than 5 ‰; The high direct voltage signal that the electron gun manipulator produces is 10KV～155KV, negative bias voltage-200～-1400V, positive grid voltage control impuls voltage-1400～500V, heater current 0.1～10A falls less than 2 ‰ in repetition 100～400HZ, pulsewidth 0.5～10 μ s, time delay 0～4 μ s, positive grid voltage pulse top.
Beneficial effect:
1, the present invention has realized electron gun and magnetron independence high voltage power distribution;
2, the present invention can independently control the high pressure output, microwave magnetron output, accelerating tube accelerating performance, the particular requirement of medical index, the requirement of modern radiotherapy technology of electron gun, magnetron manipulator according to the requirement of system, makes the most satisfactory control parameter of electron gun high voltage modulator output namely: high pressure amplitude, back bias voltage, positive grid voltage, repetition, pulsewidth and time-delay;
3, electron gun manipulator of the present invention adopts the high direct voltage distribution, the noise jamming that aligns the grid voltage pulse of having avoided the high voltage pulse distribution to cause, effectively provide pulsewidth and time delay controlled positive grid voltage pulse, ensure that the line of electron gun emission drops into the microwave envelope interval of appointment;
4, the analysis-by-synthesis of ten signals system acquisition being arrived by digital information processing system of the present invention is dynamically adjusted amplitude, pulsewidth, time delay, the repetition of positive grid voltage pulse, accurately controls electron gun output line;
5, positive grid voltage pulse top is controlled by the control signal that digital information processing system sends fully, ensure that electron gun emission line scope is in the 0-1A(pulse) controlled fully, when realizing that two types of rays of accelerator X ray and electronics line switch irradiation, need not to expend because waiting for the time of rifle body inner cathode cooling, improved the service efficiency of equipment and the security performance that equipment uses.
Description of drawings
Fig. 1 is system flow block diagram of the present invention.
The specific embodiment
Below in conjunction with the accompanying drawing embodiment that develops simultaneously, describe the present invention.
As shown in Figure 1, the dual-modulator control system of medical electronic linear accelerator of the present invention comprises magnetron manipulator, grided electron gun manipulator, magnetron, grided electron gun, accelerating tube, microwave testing circuit I, microwave testing circuit II, microwave testing circuit III, reaction type microwave system, treatment head, automatic dosage control system and digital information processing system;
Wherein, the magnetron manipulator produces 10KV～55KV(repetition 100～400HZ, a pulsewidth 2.8-4.3 μ s, the top falls less than 5 ‰) pulse signal offer magnetron, make magnetron work and produce the microwave of system requirements; It is synthetic that the microwave that the reaction type microwave system produces magnetron and accelerating tube use the remaining microwave in back to carry out effective power, produces the microwave that is higher than the magnetron output, and this microwave signal causes microwave envelope forward position and tailing edge undesirable because of synthetic generation; The grided electron gun manipulator produces following signal under the control of digital information processing system: high voltage ignition signal, rifle high pressure, back bias voltage, positive grid voltage, positive grid voltage pulse width, heater current, repetition rate, pulsewidth forward position time delay, send the electronic beam current that meets system requirements for grided electron gun; Accelerating tube accelerates to the electronic beam current of grided electron gun emission the energy of appointment with line under the control of each subsystem; The line that treatment head will speed up the different-energy of pipe output changes into the electronics line or the X ray that meet medical index and under the control of limit beam system the patient is treated; The dosage control treatment time that the close rate of automatic dosage control system sense radiation and statistics patient obtain; Microwave testing circuit I, microwave testing circuit II and microwave testing circuit III detect the microwave signal of accelerating tube entrance, outlet and magnetron output respectively; Signal processing system receives high voltage ignition signal, high-tension current signal, the high pressure amplitude signal of magnetron manipulator respectively, three road microwave envelope signals of microwave testing circuit output, the dose rate signal of automatic dosage control system output, above signal is carried out providing after the integrated treatment control signal of high voltage ignition signal, rifle high pressure, back bias voltage, positive grid voltage, positive grid voltage pulse width, heater current, repetition rate, pulsewidth forward position time delay, the work of control electron gun manipulator makes the grided electron gun manipulator produce the coherent signal that electron gun needs.
The internal system annexation: digital information processing system connects magnetron manipulator and electron gun manipulator, the magnetron manipulator connects magnetron, be connected with microwave testing circuit I between magnetron and the reaction type microwave system, microwave testing circuit II and microwave testing circuit III are connected between accelerating tube entrance and exit and the reaction type microwave system; Magnetron manipulator, microwave testing circuit I, microwave testing circuit II, microwave testing circuit III are connected with digital information processing system respectively with the automatic dosage control system, digital information processing system belongs to dual-modulator control system core, and the electron gun manipulator connects grided electron gun, accelerating tube and treatment head successively.
Operation principle: digital information processing system control magnetron manipulator produces a high-voltage pulse signal and offers magnetron, magnetron work also produces microwave, it is synthetic to carry out rational power after microwave uses the remaining microwave in back by phase shift with accelerating tube in the reaction type microwave system, the microwave (microwave power, envelope) that generation is different from magnetron output injects accelerating tube, this microwave reasonably accelerates the electronic beam current that electron gun is injected in the accelerating tube in accelerating tube, and the electronics after the acceleration converts medical ray to through the treatment head; The intensity of the ionization chamber sense radiation in the treatment head is given the automatic dosage control system, this system delivers to signal processing system after to the transmitted intensity signal processing, microwave testing circuit I detects the envelope of magnetron output microwave signal and delivers to signal processing system, microwave testing circuit II detects the envelope of accelerating tube entrance microwave signal and delivers to signal processing system, microwave testing circuit III detects the envelope of accelerating tube outlet microwave signal and delivers to signal processing system, the magnetron manipulator is with high voltage ignition signal, the high-tension current signal, the high pressure amplitude signal is delivered to digital information processing system, seven signals that digital information processing system will receive and the rifle high pressure of from the electron gun manipulator, gathering, back bias voltage, four signals of line of positive grid voltage and grided electron gun emission are analyzed the control signal that produces control grid-control electron gun filament size of current, the control signal of control grided electron gun rifle high pressure size, the control signal of back bias voltage size, the control signal of positive grid voltage size, the control signal of positive grid voltage pulse width, positive grid voltage pulse front edge delay control signal, positive grid voltage repetition rate control signal and positive grid voltage start control signal; Digital information processing system is given the electron gun manipulator with above eight control signals, and the electron gun manipulator sends the electronic beam current that meets system requirements for grided electron gun.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the dual-modulator control system of medical electronic linear accelerator, it is characterized in that, comprising: digital information processing system, magnetron manipulator, electron gun manipulator, magnetron, grided electron gun, accelerating tube, three microwave testing circuits, reaction type microwave system, treatment head and automatic dosage control system;
The internal system annexation: digital information processing system connects magnetron manipulator and electron gun manipulator respectively, the magnetron manipulator connects magnetron, be connected with a microwave testing circuit between magnetron and the reaction type microwave system, all the other two microwave testing circuits are connected between accelerating tube entrance and exit and the reaction type microwave system; Magnetron manipulator, three road microwave testing circuits are connected with digital information processing system respectively with the automatic dosage control system, and the electron gun manipulator connects grided electron gun, accelerating tube and treatment head successively.
2. the dual-modulator control system of medical electronic linear accelerator as claimed in claim 1, it is characterized in that system work process is: digital information processing system control magnetron manipulator produces a high-voltage pulse signal and offers magnetron, magnetron work also produces microwave, it is synthetic to carry out power after microwave uses the remaining microwave in back by phase shift with accelerating tube in the reaction type microwave system, the microwave that generation is different from magnetron output injects accelerating tube, this microwave accelerates the electronic beam current that electron gun is injected in the accelerating tube in accelerating tube, and the electronics after the acceleration converts medical ray to through the treatment head; The intensity of the ionization chamber sense radiation in the treatment head is given the automatic dosage control system, this system delivers to signal processing system after to the transmitted intensity signal processing, three microwave testing circuits are exported detected magnetron the envelope of microwave signal respectively, the envelope of the envelope of accelerating tube entrance microwave signal and accelerating tube outlet microwave signal is delivered to digital information processing system respectively, the magnetron manipulator is with high voltage ignition signal, the high-tension current signal, the high pressure amplitude signal is delivered to digital information processing system, seven signals that digital information processing system will receive and the rifle high pressure of from the electron gun manipulator, gathering, back bias voltage, four signals of line of positive grid voltage and grided electron gun emission are analyzed the back and are produced eight control signals, produce the control signal of control grid-control electron gun filament size of current, the control signal of control grided electron gun rifle high pressure size, the control signal of back bias voltage size, the control signal of positive grid voltage size, the control signal of positive grid voltage pulse width, positive grid voltage pulse front edge delay control signal, positive grid voltage repetition rate control signal and positive grid voltage start control signal; Digital information processing system is given the electron gun manipulator with above eight control signals, and electron gun modulator control grided electron gun sends the electronic beam current that meets system requirements.
3. the dual-modulator control system of medical electronic linear accelerator as claimed in claim 1 or 2, it is characterized in that the high-voltage pulse signal that described magnetron manipulator produces is 10KV～55KV, repetition 100～400HZ, pulsewidth 2.8-4.3 μ s, top fall less than 5 ‰; The high direct voltage signal that the electron gun manipulator produces is 10KV～155KV, negative bias voltage-200～-1400V, positive grid voltage control impuls voltage-1400～500V, heater current 0.1～10A falls less than 2 ‰ in repetition 100～400HZ, pulsewidth 0.5～10 μ s, time delay 0～4 μ s, positive grid voltage pulse top.
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| CN105204417A (en) * | 2015-10-19 | 2015-12-30 | 江苏海明医疗器械有限公司 | Control driving system for medical accelerator frame |
| CN107754098A (en) * | 2017-11-23 | 2018-03-06 | 上海联影医疗科技有限公司 | Radiotherapy equipment and its health-monitoring installation and method |
| CN107866006A (en) * | 2017-12-18 | 2018-04-03 | 合肥中科离子医学技术装备有限公司 | A kind of high voltage power supply based on the regulation of accelerator line |
| CN109547109A (en) * | 2018-10-11 | 2019-03-29 | 江苏海明医疗器械有限公司 | A kind of signal high isolation transmission circuit for electron gun modulator |
| CN109683523A (en) * | 2018-12-25 | 2019-04-26 | 中国人民解放军96630部队 | Accelerator control method and system based on programmable gate array FPGA |
| CN109999373A (en) * | 2019-04-12 | 2019-07-12 | 上海联影医疗科技有限公司 | Medical accelerator and its energy monitoring, regulating device, radiotherapy equipment |
| CN113038685A (en) * | 2019-12-25 | 2021-06-25 | 同方威视技术股份有限公司 | Method, apparatus and system for controlling a standing wave linear accelerator |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105204417A (en) * | 2015-10-19 | 2015-12-30 | 江苏海明医疗器械有限公司 | Control driving system for medical accelerator frame |
| CN105204417B (en) * | 2015-10-19 | 2018-01-12 | 江苏海明医疗器械有限公司 | A kind of control drive system of medical accelerator frame |
| CN107754098A (en) * | 2017-11-23 | 2018-03-06 | 上海联影医疗科技有限公司 | Radiotherapy equipment and its health-monitoring installation and method |
| CN107754098B (en) * | 2017-11-23 | 2020-02-07 | 上海联影医疗科技有限公司 | Radiotherapy equipment and dose control device and method thereof |
| CN107866006A (en) * | 2017-12-18 | 2018-04-03 | 合肥中科离子医学技术装备有限公司 | A kind of high voltage power supply based on the regulation of accelerator line |
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| CN109547109A (en) * | 2018-10-11 | 2019-03-29 | 江苏海明医疗器械有限公司 | A kind of signal high isolation transmission circuit for electron gun modulator |
| CN109683523A (en) * | 2018-12-25 | 2019-04-26 | 中国人民解放军96630部队 | Accelerator control method and system based on programmable gate array FPGA |
| CN109999373A (en) * | 2019-04-12 | 2019-07-12 | 上海联影医疗科技有限公司 | Medical accelerator and its energy monitoring, regulating device, radiotherapy equipment |
| CN109999373B (en) * | 2019-04-12 | 2021-11-23 | 上海联影医疗科技股份有限公司 | Medical accelerator, energy monitoring and adjusting device thereof and radiotherapy equipment |
| CN113038685A (en) * | 2019-12-25 | 2021-06-25 | 同方威视技术股份有限公司 | Method, apparatus and system for controlling a standing wave linear accelerator |
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