KR102407598B1 - Grid pulse control apparatus and method, linear accelerator using the apparatus - Google Patents

Abstract

The present invention relates to an apparatus and method for controlling a grid pulse, and a linear accelerator using the apparatus, and more specifically, by changing the pulse size in addition to the grid pulse width and pulse period, precise, accurate and stable control of the radiation dose in the radiation treatment plan is possible. It relates to a grid pulse control device and method, and a linear accelerator using the device, enabling a treatment plan that can minimize radiation exposure by possible.
In addition, the present invention is a control unit for determining the form of the grid pulse signal of the electron gun and the drive pulse signal form of the magnetron oscillator based on the output radiation dose information set according to the treatment plan; And according to the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator determined by the control unit to generate the grid pulse signal and the drive pulse signal, and apply it to the grid and the magnetron oscillator of the electron gun A grid pulse control apparatus and method for determining a shape of a grid pulse signal by adjusting a maximum anode voltage and a maximum cathode voltage based on a cathode voltage when the control unit determines a shape of a grid pulse signal, and a linear accelerator using the same .

Description

Grid pulse control apparatus and method, linear accelerator using the apparatus

The present invention relates to an apparatus and method for controlling a grid pulse, and a linear accelerator using the apparatus. Specifically, by changing the pulse size in addition to the grid pulse width and pulse period, precise, accurate and stable control of the radiation dose in the radiation treatment plan is possible. It relates to a grid pulse control device and method, and a linear accelerator using the device, enabling a treatment plan that can minimize radiation exposure by possible.

The linear accelerator for Intensity Modulated Radiation Therapy (IMRT) concentrates radiation to the tumor tissue and restores it to normal tissue through detailed radiation dose control even when organs at risk are close to the tumor. is a radiation therapy device that can minimize its effect.

Conventional linear accelerator for intensity-controlled radiation therapy is a microwave amplifier for accelerating electrons generated from an electron gun, and Klystron, which is evaluated to be stable in controlling the output radiation dose, is commonly used, but the above Klystron occupies a large volume at high cost There was a downside to doing it.

On the other hand, when using a magnetron as a microwave oscillator for acceleration of electrons generated from an electron gun instead of the klystron, the magnetron is a magnetic oscillator, so it can be implemented with a simple structure and can be miniaturized. It was difficult to control the output radiation dose, so there was a problem that it could not be applied to intensity-controlled radiation therapy.

As an improved prior art in this regard, there is a "radiation dose control method of a linear accelerator for medical use and a system therefor" of Korean Patent Registration No. 10-1590153.

The improved prior art aims to provide a method and system for stably adjusting/controlling the output radiation dose in a linear accelerator for intensity-controlled radiation therapy (IMRT) equipped with a magnetron oscillator, and a system thereof, To this end, the linear accelerator for intensity-controlled radiation therapy (IMRT) includes an electron gun emitting electrons generated from a cathode to a waveguide according to a control pulse signal applied to a grid; a magnetron oscillator for accelerating the electrons emitted from the electron gun in the waveguide; a control unit for determining a control pulse signal shape of the electron gun grid and a driving pulse signal shape of the magnetron oscillator based on the output radiation dose information set according to the treatment plan; and a pulse modulator for generating the determined control pulse signal and the driving pulse signal and applying them to the electron gun grid and the magnetron oscillator.

This improved conventional technique fixes the voltage of the grid pulse size affecting the radiation dose and adjusts the pulse width and pulse period other than that, and it is difficult to precisely control the dose because the pulse size affecting the radiation dose is not considered. .

In addition, in the improved prior art, it is complicated to calculate the radiation dose as a method of adjusting the grid pulse rate, and it is difficult to apply the method to accurately control the radiation dose in the treatment plan.

In addition, the improved prior art can implement a system of a control method, but an error may occur in the control of the radiation dose due to a complicated ratio method, so it is difficult to apply an accurate treatment to radiation directly related to life.

Domestic Patent Registration No. 10-1590153 Domestic Patent Registration No. 10-1438165 Domestic Patent Registration No. 10-1389071

The present invention has been devised to solve the above problems, and by changing the pulse size in addition to the grid pulse width and pulse period, it is possible to precisely, accurately and stably control the radiation dose in the radiation treatment plan to minimize the radiation exposure. An object of the present invention is to provide an apparatus and method for controlling a grid pulse that enables a reduced treatment plan, and a linear accelerator using the apparatus.

The grid pulse control apparatus of the present invention includes: a control unit for determining the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator based on the output radiation dose information set according to the treatment plan; And according to the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator determined by the control unit to generate the grid pulse signal and the drive pulse signal, and apply it to the grid and the magnetron oscillator of the electron gun and a modulator, wherein the controller adjusts the maximum anode voltage and the maximum cathode voltage based on the cathode voltage when determining the shape of the grid pulse signal.

In addition, when determining the form of the grid pulse signal, the control unit of the grid pulse control apparatus of the present invention determines the voltage level of the grid pulse signal based on the cathode voltage so that the maximum anode voltage is a specific value in the range of 0 to the maximum anode reference voltage. and determine that the cathode maximum voltage has a specific value in the range of 0 to the cathode maximum reference voltage.

In addition, the maximum reference voltage of the anode of the grid pulse control device of the present invention is +150V, and the maximum reference voltage of the cathode is -150V.

In addition, the pulse modulator of the grid pulse control device of the present invention, when generating the grid pulse signal according to the form of the grid pulse signal of the electron gun grid determined by the control unit, using a PWM voltage variable, the anode maximum voltage and Adjust the cathode maximum voltage.

In addition, the control unit of the grid pulse control apparatus of the present invention determines the drive pulse signal in the form of a predetermined single period, single pulse size, and single pulse width, and determines the grid pulse signal form based on the drive pulse signal It is characterized in that it is determined according to the size of the output radiation dose.

In addition, the period of the grid pulse signal of the grid pulse control apparatus of the present invention is characterized in that it is the same as the period of the driving pulse signal.

In addition, the control unit of the grid pulse control apparatus of the present invention generates a synchronization signal of the grid pulse signal and the driving pulse signal, and the pulse modulator is configured to generate the grid pulse signal and the driving pulse signal based on the synchronization signal is applied to the electron gun grid and the magnetron oscillator.

On the other hand, the grid pulse control method of the present invention comprises the steps of: (a) receiving, by a control unit, output radiation dose information according to a treatment plan; (b) determining, by the control unit, the form of the grid pulse signal of the electron gun grid and the driving pulse signal of the magnetron oscillator according to the output radiation dose; (c) generating, by a pulse modulator, the determined grid pulse signal and the driving pulse signal; (d) applying the grid pulse signal and the driving pulse signal generated by the pulse modulator to an electron gun grid and a magnetron oscillator; and (e) irradiating a target to be treated with radiation output due to the application of the grid pulse signal and the driving pulse signal, wherein the control unit determines the shape of the grid pulse signal in step (b), It is determined by adjusting the maximum anode voltage and the maximum cathode voltage based on the cathode voltage.

In addition, in step (b) of the grid pulse control method of the present invention, when determining the shape of the grid pulse signal, the controller determines the voltage level of the grid pulse signal from 0 to the maximum anode reference voltage based on the cathode voltage. is determined to have a specific value in the range of , and the cathode maximum voltage is determined to have a specific value in the range of 0 to the cathode maximum reference voltage.

In addition, in the grid pulse control method of the present invention, the maximum reference voltage of the positive electrode is +150V, and the maximum reference voltage of the negative electrode is -150V.

In addition, in the step (c) of the grid pulse control method of the present invention, when the pulse modulator generates the grid pulse signal according to the form of the grid pulse signal of the electron gun grid determined by the control unit, a PWM voltage variable is used to adjust the anode maximum voltage and cathode maximum voltage.

In addition, in step (b) of the grid pulse control method of the present invention, the control unit determines the drive pulse signal in the form of a predetermined single period, single pulse size, and single pulse width, and determines the form of the grid pulse signal to be the drive It is characterized in that it is determined according to the magnitude of the output radiation dose based on the pulse signal.

In addition, in the grid pulse control method of the present invention, the period of the grid pulse signal is the same as the period of the driving pulse signal.

In addition, the grid pulse control method of the present invention further includes (f) generating, by the control unit, a synchronization signal of the grid pulse signal and the driving pulse signal, and in step (d), the pulse modulator performs the synchronization signal Based on the grid pulse signal and the driving pulse signal is characterized in that the application to the electron gun grid and the magnetron oscillator.

On the other hand, the linear accelerator using the grid pulse control device of the present invention includes an electron gun that emits electrons generated from a cathode to a waveguide according to a grid pulse signal applied to a grid; a magnetron oscillator for acceleration in the waveguide of electrons emitted from the electron gun; a control unit for determining a shape of a grid pulse signal of the electron gun and a shape of a driving pulse signal of the magnetron oscillator based on the output radiation dose information set according to the treatment plan; And according to the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator determined by the control unit to generate the grid pulse signal and the drive pulse signal, and apply it to the grid and the magnetron oscillator of the electron gun and a modulator, wherein the controller adjusts the maximum anode voltage and the maximum cathode voltage based on the cathode voltage when determining the shape of the grid pulse signal.

The present invention as described above enables the realization of a linear accelerator capable of adjusting the radiation amount by outputting a stable radiation amount by adjusting the voltage level of the grid pulse signal.

In addition, the present invention provides precise, accurate and stable control of the radiation dose in the radiation treatment plan by controlling the voltage level of the pulse signal in addition to controlling the dose using changes in the pulse width and pulse period used in the improved prior art. This makes it possible to plan a treatment plan that can reduce radiation exposure to a minimum.

In addition, the present invention maximizes treatment by concentrating the dose in a method of finely changing the voltage level of the grid pulse signal in order to more precisely control the dose through changing the grid pulse width and pulse period used in the improved prior art. can

The accompanying drawings, which are included as part of the detailed description to help the understanding of the present invention, provide embodiments of the present invention, and together with the detailed description, explain the technical spirit of the present invention.
1 is a diagram showing the configuration of a linear accelerator using a grid pulse control apparatus according to an embodiment of the present invention.
Figure 2 is a detailed configuration diagram of the electron gun of Figure 1.
3 is an exemplary diagram for explaining a grid pulse signal having the form of a single pulse period, a single pulse size, and a single pulse width.
FIG. 4 is a diagram for explaining that the voltage of the grid pulse signal is lower than the cathode voltage, so that electrons are blocked.
5 is a diagram for explaining that the voltage of the grid pulse signal is higher than the cathode voltage, so that electrons are emitted.
6 is a view showing an embodiment of variously controlling the maximum anode voltage and the maximum cathode voltage of a grid pulse signal.
7 is a flowchart of a grid pulse control method according to an embodiment of the present invention.

In order to explain the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, preferred embodiments of the present invention will be exemplified below and will be described with reference to them.

First, the terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention, and the singular expression may include a plural expression unless the context clearly indicates otherwise. In addition, in this application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other It should be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

In describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is a diagram showing the configuration of a linear accelerator using a grid pulse control apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , a linear accelerator 100 using a grid pulse control apparatus according to an embodiment of the present invention includes an electron gun 110 , a magnetron oscillator 120 , a pulse modulator 130 , a controller 140 , and a waveguide 150 . ) is included.

The electron gun 110 is a device for controlling generation of electrons in an electron tube, formation of an electron beam, acceleration, focusing, and intensity of an electron beam according to an input signal.

As shown in FIG. 2, the electron gun 110 as such is a heater 110-1, a cathode 110-2 for generating electrons, an anode 110-3, and generation of the electrons. may include a grid 110-4 for controlling the .

The electron gun 110 is turned on/off according to the magnitude of the grid pulse voltage based on the voltage of the cathode 110-2 to turn on/off the electron beam.

Electrons from the electron gun 100 pass through the grid 110-3 and pass through the waveguide 150 to emit radiation. At this time, the amount of generated electrons is proportional to the amount of radiation.

Here, the grid pulse signal has a preset single pulse period, a single pulse magnitude, and a single pulse width as shown in FIG. 3 .

When the voltage of the grid pulse signal is lower than the voltage of the cathode 110-2 as shown in FIG. 4, electrons are blocked, and when the voltage of the grid pulse signal is higher than the voltage of the cathode 110-2 as shown in FIG. will go out

As such, whether or not electrons are generated from the cathode 110-2 can be controlled according to the grid pulse signal applied to the grid 110-3 of the electron gun 110, and the electrons generated from the cathode 110-2 are It may be provided/emitted to the waveguide 150 .

The magnetron oscillator (120, Magnetron) is an electromagnetic vacuum tube for oscillating a high frequency (micro-wave). When the high frequency energy generated in the magnetron oscillator 120 is applied to the waveguide 150, the The electrons or electron beams interact with the high-frequency energy to cause a bunching phenomenon so that the electrons can be accelerated to a high speed.

In the present invention, in the magnetron oscillator 120 , the above high frequency generation may be controlled according to the driving pulse signal applied from the pulse modulator 130 .

The pulse modulator 130 (Pulse Modulator) may generate a grid pulse signal of the electron gun 110 and a driving pulse signal of the magnetron oscillator 120 based on information received from the control unit 140 and apply it.

Specifically, the pulse modulator 130 generates a grid pulse signal of the electron gun 110 and a driving pulse signal of the magnetron oscillator 120 based on the information about the pulse signal form received from the control unit 140, and generates The grid pulse signal and the driving pulse signal may be applied to the grid of the electron gun 110 and the magnetron oscillator 120 .

At this time, the pulse modulator 130 generates the grid pulse signal and the drive pulse signal based on the synchronization signal of the grid pulse signal and the drive pulse signal received from the control unit 140 to the grid of the electron gun 110 and the It can be applied to the magnetron oscillator 120 .

The control unit 140 (Micro Control Unit) is configured to form a grid/driving pulse signal generated from the pulse modulator 130 based on output radiation dose information set according to a treatment plan (eg, a period, a magnitude of a pulse signal). and pulse width) and generate a synchronization signal for adjusting a phase or frequency between the grid/driving pulse signals.

The output radiation dose information is, for example, according to a specific situation according to a treatment plan to focus the radiation dose to the lesion tissue and minimize the radiation dose to the normal tissue through the linear accelerator 100 according to the embodiment of the present invention. can be set

In this case, the output radiation dose information includes the amount of radiation (eg, X-ray) generated when electrons accelerated in the waveguide 150 collide with a target, the type of tissue to be irradiated with radiation, the location of the tissue, and the density of the tissue. And it may be set in consideration of the position of the irradiation unit head irradiating the output radiation of the linear accelerator 100 according to the embodiment of the present invention and the distance from the patient.

On the other hand, the output radiation dose information is input according to the selection of a user who establishes a treatment plan through an electronic device such as a PC (personal computer) interlocked with the linear accelerator 100 according to an embodiment of the present invention, and the control unit ( 140) can be transferred.

At this time, the control unit 140 determines the driving pulse signal for high frequency generation in the magnetron oscillator 120 in the form of a preset single period, single pulse size and single pulse width, but the grid pulse of the electron gun 110 . By determining the signal shape according to the magnitude of the output radiation dose based on the driving pulse signal, the amount of accelerated electrons in the waveguide 150 can be controlled, and thus the output radiation amount can be arbitrarily adjusted.

As such, the grid pulse signal may be determined in the form of a predetermined single pulse period, single pulse size, and single pulse width, and the pulse signal form may be determined according to the magnitude of the radiation dose of the linear accelerator based on the driving pulse signal.

To this end, the control unit 140 controls the positive maximum voltage (POS:POSitive voltage) and the negative maximum voltage (NEG: NEGative voltage) of a single pulse magnitude of the grid pulse signal as shown in FIGS. 6A to 6C . By adjusting the voltage of the cathode 110-2 as a reference, it is possible to precisely control the radiation dose.

Here, the grid pulse signal is an ON and OFF signal for emitting an electron beam of an electron gun. When the grid pulse signal is turned on, an electron beam is emitted, and when the grid pulse signal is turned off, the electron beam is not emitted.

The pulse magnitude of the grid pulse signal is variable with the positive maximum voltage (POS) in the range of 0 to +150V, for example, and the negative maximum voltage (NEG) in the range of 0 to -150V, for example, based on the cathode voltage. The pulse modulator 130 is controlled by the controller 140 to make it possible.

As such, the controller 140 controls the pulse modulator 130 so that the voltage level of the grid pulse signal is varied in an anode maximum voltage (POS) range of 0 to +150V, for example, and a cathode maximum voltage (NEG) is 0, for example. By controlling it to be variable at ~-150V, it is possible to select an appropriate radiation dose for treatment by measuring the change in radiation dose.

The control unit 140 may control the maximum anode voltage and the maximum cathode voltage of the grid pulse signal output from the pulse modulator 130 in various ways, and may include analog voltage variable, PWM (pulse width modulation) voltage variable, digital voltage variable etc. can be used.

For example, when a 20% duty rate is set based on the output radiation dose information, the pulse modulator 130 outputs the anode maximum voltage to have 30V when the grid anode maximum reference voltage is, for example, 150V . Of course, at this time, the pulse modulator 130 outputs the negative maximum voltage to have -120V when the negative maximum reference voltage is -150V.

Next, for example, when a 50% duty rate is set based on the output radiation dose information, the pulse modulator 130 sets the anode maximum voltage to 75V when the grid anode maximum reference voltage is 150V for example. print out Of course, at this time, the pulse modulator 130 outputs the negative maximum voltage to have -75V when the negative maximum reference voltage is -150V.

In addition, when a 70% duty rate is set based on the output radiation dose information, the pulse modulator 130 outputs the maximum anode voltage to have 120V when the grid anode maximum reference voltage is 150V for example. Of course, at this time, the pulse modulator 130 outputs the maximum negative voltage of -30V when the negative maximum reference voltage is -150V.

As described above, the linear accelerator 100 using the grid pulse control device according to the embodiment of the present invention controls the amount of accelerated electrons in the waveguide 150 through the shape control of the grid pulse signal applied to the grid of the electron gun 110 . By doing so, the output radiation dose can be arbitrarily adjusted.

The waveguide 150 (Wave-guide) is a transmission path for accelerating electrons or electron beams generated from the electron gun 110 to a predetermined speed using a high frequency generated from the magnetron oscillator 120 to transmit them to the irradiation unit head, The waveguide 150 may be implemented to maintain a high degree of vacuum and a constant temperature with an oxygen free copper material.

The irradiation unit head collides the electron beam transmitted through the waveguide 150 with a target for generating radiation and irradiates radiation (eg, X-rays) generated therefrom directly to the target to be treated, or the waveguide 150 A bending magnet is provided at the distal end of the beam to generate radiation by appropriately changing the path of the electron beam, and then it can be irradiated to the target to be treated.

7 is a flowchart of a grid pulse control method according to an embodiment of the present invention.

Referring to FIG. 7 , in the grid pulse control method according to an embodiment of the present invention, information on an output radiation dose according to a treatment plan is first received through an electronic device such as a PC linked to a linear accelerator (S101).

The control unit 140 forms a grid pulse signal of the electron gun 110 grid and a driving pulse signal of the magnetron oscillator 120 based on the output radiation dose information (eg, a period of a pulse signal, a pulse size, a pulse width) etc.) is determined (S103).

In particular, in relation to the present invention, the controller 140 sets the voltage level of the grid pulse signal to a specific value in a range where the anode maximum voltage (POS) is equal to or less than the anode maximum reference voltage (eg +150V) based on the cathode voltage. is determined to have a specific value in the range where the negative maximum voltage (NEG) is equal to or greater than the negative maximum reference voltage (eg -150V).

As such, the controller 140 controls the pulse modulator 130 so that the voltage level of the grid pulse signal is varied in an anode maximum voltage (POS) range of 0 to +150V, for example, and a cathode maximum voltage (NEG) is 0, for example. By controlling it to be variable at ~-150V, it is possible to select an appropriate radiation dose for treatment by measuring the change in radiation dose.

The pulse modulator 130 generates a grid pulse signal of the grid of the electron gun 110 and a driving pulse signal of the magnetron oscillator 120 based on the information about the pulse signal form received from the control unit 140 (S105) .

At this time, the control unit 140 can control the maximum anode voltage and the maximum cathode voltage of the grid pulse signal output from the pulse modulator 130 in various ways, and the analog voltage variable, the PWM (pulse width modulation) voltage variable, A digital voltage variable or the like can be used.

For example, when a 20% duty rate is set based on the output radiation dose information, the pulse modulator 130 outputs the anode maximum voltage to have 30V when the grid anode maximum reference voltage is, for example, 150V . Of course, at this time, the pulse modulator 130 outputs the negative maximum voltage to have -120V when the negative maximum reference voltage is -150V.

Next, for example, when a 50% duty rate is set based on the output radiation dose information, the pulse modulator 130 sets the anode maximum voltage to 75V when the grid anode maximum reference voltage is 150V for example. print out Of course, at this time, the pulse modulator 130 outputs the negative maximum voltage to have -75V when the negative maximum reference voltage is -150V.

In addition, when a 70% duty rate is set based on the output radiation dose information, the pulse modulator 130 outputs the maximum anode voltage to have 120V when the grid anode maximum reference voltage is 150V for example. Of course, at this time, the pulse modulator 130 outputs the maximum negative voltage of -30V when the negative maximum reference voltage is -150V.

On the other hand, by applying the grid pulse signal and the driving pulse signal generated through the step S105 to the grid and the magnetron oscillator 120 of the electron gun 110 (S107), the output radiation is irradiated to the target to be treated. to perform (S109).

The present invention as described above enables the realization of a linear accelerator capable of adjusting the radiation dose by outputting a stable radiation dose by adjusting the grid pulse magnitude voltage.

In addition, the present invention enables precise, accurate and stable control of the radiation dose in the radiation treatment plan by adjusting the pulse size in addition to controlling the dose by using the changes in the pulse width and pulse period used in the improved prior art. Make it possible to plan a treatment that minimizes radiation exposure.

In addition, the present invention can maximize the treatment by concentrating the dose by a method of finely changing the grid pulse size in order to more precisely control the dose by changing the grid pulse width and pulse period used in the improved prior art.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments described in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: linear accelerator 110: electron gun
120: magnetron oscillator 130: pulse modulator
140: control unit 150: waveguide

Claims (15)

a control unit for determining the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator based on the output radiation dose information; and
Pulse modulator to generate the grid pulse signal and the drive pulse signal according to the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator determined by the control unit and apply to the grid and the magnetron oscillator of the electron gun, respectively includes,
The control unit determines the drive pulse signal in the form of a predetermined single period, single pulse size, and single pulse width, and determines the shape of the grid pulse signal according to the size of the output radiation dose based on the drive pulse signal do,
The control unit determines that the period of the grid pulse signal is the same as the period of the driving pulse signal, and in determining the voltage level of the grid pulse signal, the maximum anode voltage is within a range from the cathode voltage to the maximum anode reference voltage. determine that the cathode maximum voltage has a value within a range from the cathode voltage to the cathode maximum reference voltage;
Grid pulse control apparatus for setting the pulse modulator to increase the maximum anode voltage and also increase the maximum cathode voltage as the duty ratio of the grid pulse signal increases according to the control of the controller. delete The method according to claim 1,
The maximum reference voltage of the anode is +150V, and the maximum reference voltage of the cathode is -150V. The method according to claim 1,
The pulse modulator is
When generating the grid pulse signal according to the form of the grid pulse signal of the electron gun grid determined by the control unit, a grid pulse control device for adjusting the maximum positive voltage and the maximum negative voltage using a PWM voltage variable. delete delete The method according to claim 1,
The control unit is
generating a synchronization signal of the grid pulse signal and the driving pulse signal;
The pulse modulator is
Grid pulse control apparatus, characterized in that for applying the grid pulse signal and the driving pulse signal to the electron gun grid and the magnetron oscillator based on the synchronization signal. (a) receiving the output radiation dose information by the control unit;
(b) determining, by the control unit, the form of the grid pulse signal of the electron gun grid and the driving pulse signal of the magnetron oscillator according to the output radiation dose;
(c) generating, by a pulse modulator, the determined grid pulse signal and the driving pulse signal;
(d) applying the grid pulse signal and the driving pulse signal to an electron gun grid and a magnetron oscillator, respectively; and
(e) irradiating a target to be treated with radiation output according to the grid pulse signal and the driving pulse signal;
(b) in step,
(b-1) determining the drive pulse signal in the form of a predetermined single period, single pulse size, and single pulse width, and determining the shape of the grid pulse signal according to the size of the output radiation dose based on the drive pulse signal decide,
(b-2) determining that the period of the grid pulse signal is the same as the period of the driving pulse signal;
(b-3) in the determination of the voltage magnitude of the grid pulse signal, it is determined that the anode maximum voltage has a value within the range of the cathode maximum reference voltage from the cathode voltage, and the cathode maximum voltage is within the range of the cathode maximum reference voltage from the cathode voltage. decide to have a value,
In step (c), according to the control of the controller, the pulse modulator is set to increase the maximum voltage of the anode and the maximum voltage of the cathode as the duty ratio of the grid pulse signal increases. delete 9. The method of claim 8,
The maximum reference voltage of the anode is +150V, and the maximum reference voltage of the cathode is -150V. 9. The method of claim 8,
When the pulse modulator generates the grid pulse signal according to the form of the grid pulse signal of the electron gun grid determined by the control unit in the step (c), the anode maximum voltage and the cathode maximum voltage are adjusted using a PWM voltage variable. grid pulse control method. delete delete 9. The method of claim 8,
(f) generating, by the control unit, a synchronization signal of the grid pulse signal and the driving pulse signal;
Grid pulse control method, characterized in that the pulse modulator applies the grid pulse signal and the driving pulse signal to the electron gun grid and the magnetron oscillator based on the synchronization signal in the step (d). an electron gun emitting electrons generated from a cathode to a waveguide according to a grid pulse signal applied to a grid;
a magnetron oscillator for acceleration in the waveguide of electrons emitted from the electron gun;
a control unit for determining a form of a grid pulse signal of the electron gun and a form of a driving pulse signal of the magnetron oscillator based on the output radiation dose information; and
Pulse modulator to generate the grid pulse signal and the drive pulse signal according to the shape of the grid pulse signal of the electron gun and the drive pulse signal shape of the magnetron oscillator determined by the control unit and apply to the grid and the magnetron oscillator of the electron gun, respectively includes,
The control unit determines the drive pulse signal in the form of a predetermined single period, single pulse size, and single pulse width, and determines the shape of the grid pulse signal according to the size of the output radiation dose based on the drive pulse signal do,
The control unit determines that the period of the grid pulse signal is the same as the period of the driving pulse signal, and in determining the voltage level of the grid pulse signal, the maximum anode voltage is within a range from the cathode voltage to the maximum anode reference voltage. determine that the cathode maximum voltage has a value within a range from the cathode voltage to the cathode maximum reference voltage;
The pulse modulator is configured to increase the maximum anode voltage and increase the cathode maximum voltage as the duty ratio of the grid pulse signal increases according to the control of the controller.

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