CN111053978A - Ionization chamber and method for controlling temperature of ionization chamber - Google Patents
Ionization chamber and method for controlling temperature of ionization chamber Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 160
- 238000001959 radiotherapy Methods 0.000 claims description 19
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 231100000673 dose–response relationship Toxicity 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1071—Monitoring, verifying, controlling systems and methods for verifying the dose delivered by the treatment plan
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1075—Monitoring, verifying, controlling systems and methods for testing, calibrating, or quality assurance of the radiation treatment apparatus
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Abstract
The invention discloses an ionization chamber and a method for controlling the temperature of the ionization chamber, wherein the ionization chamber comprises: an ionization chamber body; the power supply device is connected with the heating device and is used for providing heating power for the heating device; the heating device is arranged on the periphery of the ionization chamber body and used for heating the ionization chamber body. The technical scheme of the embodiment of the invention solves the technical problems that in the prior art, when the temperature and humidity in the ionization chamber change violently, the properties of materials such as leakage current and electrode films are changed, so that the precise measurement of ionization signals in the ionization chamber is greatly influenced, and the corresponding stability of the dose of the open ionization chamber is reduced, and realizes the technical effects of dynamically adjusting the temperature in the ionization chamber, maintaining the temperature in the ionization chamber within a preset range and further improving the dose stability in the ionization chamber.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical treatment, in particular to an ionization chamber and a method for controlling the temperature of the ionization chamber.
Background
In radiotherapy, the accuracy and stability of the dose are particularly critical, and the output characteristics of the dose have an important influence on the ionization chamber for monitoring the dose. Due to the technical difficulty of the closed ionization chamber, most machines use an open flat-plate ionization chamber to monitor the beam current.
The dose signal response of the open ionization chamber is affected by various factors such as temperature, air pressure, and humidity, which may affect the stability of dose delivery. When the temperature and air pressure correction factor is used for corresponding correction in the prior art, the change of air density caused by the change of temperature and air pressure can affect the signal response. Furthermore, when the temperature and humidity change in the ionization chamber is severe, the properties of materials such as leakage current and electrode films can be changed, so that the precise measurement of ionization signals in the ionization chamber is greatly influenced, and the dose response stability of the open ionization chamber is reduced.
Disclosure of Invention
The invention provides an ionization chamber and a method for controlling the temperature of the ionization chamber, which are used for maintaining the temperature and the humidity in the ionization chamber within a preset range, thereby improving the technical effect of improving the dose stability of the ionization chamber.
In a first aspect, the present invention provides an ionization chamber comprising:
an ionization chamber body;
the power supply device is connected with the heating device and is used for providing heating power for the heating device;
the heating device is arranged on the periphery of the ionization chamber body and used for heating the ionization chamber body.
Further, the ionization chamber further comprises: a first temperature sensor for acquiring a current temperature of the heating device.
Further, the power supply device is an independent power supply; and the independent power supply is connected with the controller and used for receiving the power supply control signal sent by the controller.
Further, the controller is configured to receive the current temperature, generate a power supply control signal corresponding to the current temperature according to the current temperature, and send the power supply control signal to the independent power supply, so that the independent power supply supplies power to the heating device according to the power supply control signal.
Furthermore, the power supply device is a radiotherapy system, is connected with the first temperature sensor, and is used for receiving the current temperature and adjusting the power supply applied to the heating device according to the current temperature.
Further, the ionization chamber further comprises: and the second temperature sensor is arranged on the inner wall of the ionization chamber body and used for detecting the internal temperature of the ionization chamber.
Further, the heating means comprise a heating foil and/or at least one heating resistor.
Further, the ionization chamber further comprises: and the heat conduction device is paved between the periphery of the ionization chamber and the heating device and is used for conducting heat conduction on heat released by the heating device.
Further, the ionization chamber further comprises:
at least one convection device is arranged outside the ionization chamber and used for adjusting the air convection velocity of the ionization chamber.
In a second aspect, embodiments of the present invention further provide a method for controlling the temperature of an ionization chamber, the method including:
the power supply device receives a power supply control signal;
and powering the heating device based on the control signal so as to enable the temperature of the ionization chamber to be within a preset temperature range.
According to the technical scheme of the embodiment of the invention, the ionization chamber body is adopted; the power supply device is arranged at two ends of the heating device and used for supplying heating power to the heating device; heating device, the setting is in the periphery of ionization chamber body, be used for heating the ionization chamber body, when having solved among the prior art humiture change acutely in the ionization chamber, can cause the leakage current, the nature of materials such as electrode film changes, thereby produce huge influence to the accurate measurement of ionization signal in the ionization chamber, and then lead to the technical problem that the corresponding stability of dose of open ionization chamber reduces, the temperature in the dynamic adjustment ionization chamber has been realized, make the temperature in the ionization chamber maintain within the predetermined range, and then improve the technical effect of dose stability in the ionization chamber.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, a brief description is given below of the drawings used in describing the embodiments. It should be clear that the described figures are only views of some of the embodiments of the invention to be described, not all, and that for a person skilled in the art, other figures can be derived from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of an ionization chamber according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ionization chamber according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken along A-A' of FIG. 2;
FIG. 4 is a schematic cross-sectional view taken along A-A' of FIG. 2;
FIG. 5 is a schematic cross-sectional view taken along A-A' of FIG. 2;
FIG. 6 is a schematic cross-sectional view taken along A-A' of FIG. 2;
FIG. 7 is a schematic cross-sectional view taken along A-A' of FIG. 2;
fig. 8 is a flowchart illustrating a method for controlling the temperature of the ionization chamber according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of an ionization chamber according to an embodiment of the present invention. As shown in fig. 1, the ionization chamber includes: an ionization chamber body 10; the power supply device 20 is connected with the heating device 30 and is used for supplying heating power to the heating device 30; and the heating device 30 is arranged on the periphery of the ionization chamber body 10 and is used for heating the ionization chamber body 10.
The power supply device 20 is a device that supplies power to the heating device 30, that is, provides heating power, and optionally, the power supply device 20 may be an independent external power supply or a radiotherapy system, and the radiotherapy system may supply power to the heating device 30. The heating device 30 is a device that can generate heat after the power supply device supplies heating power thereto. The heating device 30 is disposed at the periphery of the ionization chamber body 10, that is, the heating device 30 is disposed on the outer wall of the ionization chamber body 10, so that when the heating device 30 generates heat, heat can be supplied to the ionization chamber, thereby ensuring that the temperature in the ionization chamber reaches a preset temperature range. Of course, when the temperature in the ionization chamber changes, the humidity in the ionization chamber also changes, and the humidity in the ionization chamber can also reach the preset humidity requirement. The heating means 30 is provided on the outer wall of the ionization chamber body 10. It can also be understood that: in order not to affect the electric signal in the ionization chamber, the heating device 30 is disposed along the outer wall of the ionization chamber body 10, so as to ensure that the temperature and humidity in the ionization chamber can be ensured, and the electric signal in the ionization chamber can not be affected when the ionization chamber is operated.
Specifically, as can be seen in fig. 1 and 2, a heating device 30 is disposed on the periphery, i.e., the outer wall, of the ionization chamber body 10. The heating means is arranged to provide heat to the ionisation chamber so as to maintain the temperature of the ionisation chamber within a predetermined temperature range, optionally within the range 25 ℃ to 30 ℃. The power supply device 20 is further arranged outside the ionization chamber body 10, and optionally, an independent power supply or a radiotherapy system is used as a power supply for providing heating power for the heating device 30, so that the heating device 30 can generate heat, heat is provided for the ionization chamber, the temperature in the ionization chamber is ensured within a preset temperature range, and the technical effect of dose stability in the ionization chamber is improved.
In practical applications, a temperature sensor may be disposed in the heating device 30 to obtain the current temperature of the heating device 30 in real time or at intervals, and determine whether to increase or decrease the heating power supplied to the heating device 30 according to the current temperature of the heating device 30. Optionally, a first temperature sensor 40 is arranged in the heating device for acquiring a current temperature of the heating device, see fig. 3.
Referring to fig. 3, it can be understood that: the first temperature sensor 40 is mainly used for monitoring the current temperature of the heating device 30 in real time. During a specific application, if the first temperature sensor 40 detects the current temperature of the heating device 30, the current temperature may be sent to a module for processing temperature information. Optionally, the module for processing temperature information may be a controller, or a temperature processing module in a radiotherapy system. A temperature processing module in the controller or in the radiotherapy system, upon receiving the current temperature, may process the current temperature to determine whether to alter the heating power provided to the heating device.
The power supply device 20 for supplying heating power to the heating device 30 may be an independent power supply. Optionally, the independent power supply 50 is connected to the controller 60 for receiving a power supply control signal sent by the controller, see fig. 4.
The controller 60 may be understood as a PID controller, and is configured to dynamically adjust whether to send a power supply heating signal to the independent power supply according to the received temperature information, so as to adjust the heating power applied to the heating device by the power supply device, that is, after the controller 60 determines the heating power applied to the heating device by the independent power supply 50 according to the received current temperature information and the temperature information required in the ionization chamber, the power supply control signal corresponding to the heating power may be generated and sent to the independent power supply 50.
In the present embodiment, in order to accurately determine the power supply control signal transmitted to the power supply device 20, the controller 50 also needs to acquire the temperature information detected by the first temperature sensor. Optionally, the controller 50 is connected to the first temperature sensor 40, and the controller 50 may acquire temperature information detected by the first temperature sensor 40, generate a heating control signal corresponding to the current temperature according to the detected temperature information, and send the power supply control signal to the independent power supply 50, so that the independent power supply heats the heating device 30 according to the power supply control signal.
That is, when the power supply device 20 is the independent power supply 50, a controller 60 may be provided to be connected to the power supply device 20. When the first temperature sensor 40 transmits the monitored current temperature information to the controller 60, the controller 60 may generate a power supply control signal according to the received current temperature information. The controller 60 may transmit a power supply control signal to the independent power supply 50 to cause the independent power supply 50 to supply power to the heating device 30 according to the received power supply control signal to start the heating device to generate heat.
It should be noted that, if the power supply device is not an independent power supply, it is integrated in the radiotherapy system. At this time, in the present embodiment, the controller may be present or not. If the controller is not included, the sending of the power supply control signal to the heating device may be: the first temperature sensor can be connected with a radiotherapy system, and a processing module in the radiotherapy system can acquire the current temperature detected by the first temperature sensor in real time or at intervals and calculate the heating power required to be applied by the power supply device according to the current temperature. After the heating power is determined, a power supply control signal corresponding to the heating power can be generated and sent to a power supply module in the radiotherapy system, so that the power supply module in the radiotherapy system can heat the heating device according to the received power supply control signal. If the controller is included, the controller can be respectively connected with the temperature sensor and a power supply module in the radiotherapy system, and the controller determines a power supply control signal sent to the power supply device when receiving the current temperature information.
On the basis of the technical scheme, in order to further ensure that the temperature in the ionization chamber is within the preset temperature range, a temperature sensor can be arranged in the ionization chamber, namely the temperature sensor is arranged on the inner wall of the ionization chamber body. Optionally, the ionization chamber further comprises: and a second temperature sensor 70, provided on an inner wall of the ionization chamber body, for detecting the temperature inside the ionization chamber, see fig. 5.
Wherein the second temperature sensor 70 is identical to the first temperature sensor. A second temperature sensor 70 is provided inside the ionization chamber body 70 for detecting the temperature inside the ionization chamber. The second temperature sensor 70 may send the sensed temperature to the controller 60 or to a processing module in the radiotherapy system. The second temperature sensor 70 is advantageous in that the temperature and humidity inside the ionization chamber can be precisely adjusted according to the temperature information sent by the first temperature sensor and the second temperature sensor.
In this embodiment, the heating means for providing heat to the ionization chamber may be a heating film and/or at least one heating resistor.
Referring to fig. 6, the heating device 30 is a heating resistor 301, at least one heating resistor 301 may be one, two, or more, and a user may set the number of the heating resistors 301 according to actual needs. The power supply devices 20 are respectively connected to the heating resistors 301, and when the power supply devices apply heating power, the heating resistors 301 can generate a certain amount of heat, and the heat can achieve the effect of adjusting the temperature inside the ionization chamber. The heating layer may be a polyimide coated copper heating film, or a graphite conductive heating film of a PET substrate.
That is, the heating means for adjusting the temperature inside the ionization chamber may include at least two kinds. Alternatively, the heating device may be a heating film, or a heating resistor 301, or may be a part of the heating resistor 301 and a part of the heating film. When the heating device is a heating film, the heating film may cover the entire outer wall of the ionization chamber, and when the power supply device supplies power to the heating film, the heating film may generate heat and may perform heat transfer with the inside of the ionization chamber, so as to ensure that the temperature of the ionization chamber is within a preset range. Of course, a heating resistor 301 may be provided, which generates heat and conducts heat with the ionization chamber when the power supply device supplies power to the heating resistor, see fig. 6.
On the basis of the technical scheme, in order to improve the uniformity of heating the ionization chamber, a heat conduction component can be arranged on the outer wall of the ionization chamber. Optionally, a heat conducting device 80 is disposed between the periphery of the ionization chamber body and the heating device 30 for conducting heat released from the heating device 30, see fig. 7.
With continued reference to fig. 7, the heat conducting device 80 may be a metal ring, and the heat conducting device 80 may also be understood as a heating structural member, and the heating structural member may be disposed between the heating device and the outer wall of the ionization chamber body, and when the heating device releases heat, the heating structural member may uniformly heat the environment in the ionization chamber, thereby avoiding the problem of non-uniform heating of the ionization chamber.
It should be noted that, no matter whether the heating device is a heating resistor or a heating film, a heat conduction device may be provided, and optionally, the metal ring is used to adjust the uniformity of heating the ionization chamber.
On the basis of the technical scheme, in order to further ensure the humidity inside the ionization chamber, at least one convection device is arranged outside the ionization chamber. Optionally, at least one convection device is disposed outside the ionization chamber for regulating the convection velocity of air inside the ionization chamber.
Wherein the at least one convection device may be a fan. The number of the at least one convection device may be one, two or more. The number of convection devices may be set according to practical conditions and is not particularly limited herein. At least one convection device disposed outside the ionization chamber. When the at least one convection device is operated, the temperature and humidity within the ionization chamber may be adjusted to ensure that the temperature and humidity of the ionization chamber are within a predetermined range.
In this embodiment, when the scanning machine is started, that is, when the scanning machine starts to operate, the heating device at the periphery of the ionization chamber also starts to operate, and according to theoretical calculation and experimental results, the temperature required by the ionization chamber can be reached within generally five minutes, that is, the temperature information detected by the first temperature sensor reaches the preset temperature, so that the time for the temperature in the ionization chamber to reach the preset temperature is shortened. Furthermore, because be provided with first temperature sensor in the heating device of ionization chamber, the inside second temperature sensor that is provided with of ionization chamber, when the temperature difference that first temperature sensor and second temperature sensor detected exceeded the second threshold value, then can produce relevant interlocking for radiotherapy equipment stop work, the reason lies in probably because heating device's accuse temperature breaks down, makes dose measurement result less accurate so. That is to say, through the peripheral heating device who sets up of ionization chamber, can be so that dosage measurement result is more accurate to it is more accurate to make target area bear the dose, has promoted the security and the reliability of radiotherapy process, has also reduced the radiotherapy risk.
According to the technical scheme of the embodiment of the invention, the ionization chamber body is adopted; the power supply device is arranged at two ends of the heating device and used for supplying heating power to the heating device; heating device, the setting is in the periphery of ionization chamber body, be used for heating the ionization chamber body, when having solved among the prior art humiture change acutely in the ionization chamber, can cause the leakage current, the nature of materials such as electrode film changes, thereby produce huge influence to the accurate measurement of ionization signal in the ionization chamber, and then lead to the technical problem that the corresponding stability of dose of open ionization chamber reduces, the temperature in the dynamic adjustment ionization chamber has been realized, make the temperature in the ionization chamber maintain within the predetermined range, and then improve the technical effect of dose stability in the ionization chamber.
Example two
Fig. 8 is a flowchart illustrating a method for controlling the temperature of the ionization chamber according to a second embodiment of the present invention. The method is suitable for dynamically adjusting the temperature in the ionization chamber, and is realized based on each component arranged in the ionization chamber, and certainly, the method can also realize the control of the temperature in the ionization chamber by controlling each component to work based on an application program arranged in a system.
As shown in fig. 8, the method includes:
and S810, the power supply device receives a power supply control signal.
The power supply device can be understood as a separate power supply or a radiotherapy system. A temperature sensor may also be provided within the ionization chamber for detecting the temperature within the ionization chamber. A temperature sensor may also be provided outside the ionization chamber for detecting the current temperature of the heating means. The temperature information detected by the first temperature sensor and the second temperature sensor can be sent to a controller connected with the first temperature sensor and the second temperature sensor or other processing devices. The controller may process the received temperature information and generate a power supply control signal corresponding to the detected temperature information.
The controller can send the power supply control signal to the power supply unit to make the power supply unit supply power to the heating device according to the received power supply control signal, so that the temperature of the heating device reaches the preset temperature.
And S820, supplying power to the heating device based on the power supply control signal so as to enable the temperature in the ionization chamber to be within a preset temperature range.
After the power supply device receives the power supply control signal, the power supply device can supply heat to the heating device. After the heating device generates heat, the heating device can supply heat to the ionization chamber so as to enable the temperature of the ionization chamber to be within a preset range.
In this embodiment, the control method for adjusting the internal temperature of the ionization chamber may be: the heating structure is additionally arranged around the ionization chamber, the heating film is attached to the heating structure and uniformly heats the environment around the ionization chamber through the heating structure, meanwhile, the temperature of the heating structure is measured by using the temperature sensor, the heating power is controlled through a closed loop, the temperature environment around the ionization chamber is stabilized in a constant range, and meanwhile, the humidity of the local environment is also reduced through heating. On the basis, the stability of the dosage is improved correspondingly. The specific method comprises the following steps: a circle of heating structural member is added around the ionization chamber, a heating element such as a heating film is attached to the heating structural member, and a temperature sensor is installed on the structural member. The controllable power supply is used for supplying power and heating the heating film, and meanwhile, the heating power is controlled in a closed loop mode through the temperature sensor, so that the temperature is stabilized in a certain range.
According to the technical scheme of the embodiment of the invention, the ionization chamber body is adopted; the power supply device is arranged at two ends of the heating device and used for supplying heating power to the heating device; heating device, the setting is in the periphery of ionization chamber body, be used for heating the ionization chamber body, when having solved among the prior art humiture change acutely in the ionization chamber, can cause the leakage current, the nature of materials such as electrode film changes, thereby produce huge influence to the accurate measurement of ionization signal in the ionization chamber, and then lead to the technical problem that the corresponding stability of dose of open ionization chamber reduces, the temperature in the dynamic adjustment ionization chamber has been realized, make the temperature in the ionization chamber maintain within the predetermined range, and then improve the technical effect of dose stability in the ionization chamber.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An ionization chamber, comprising:
an ionization chamber body;
the power supply device is connected with the heating device and is used for providing heating power for the heating device;
the heating device is arranged on the periphery of the ionization chamber body and used for heating the ionization chamber body.
2. The ionization chamber of claim 1, further comprising:
a first temperature sensor for acquiring a current temperature of the heating device.
3. The ionization chamber of claim 2, wherein the power supply is an independent power supply;
and the independent power supply is connected with the controller and used for receiving the power supply control signal sent by the controller.
4. The ionization chamber of claim 3, wherein the controller is configured to receive the current temperature, and generate a power supply control signal corresponding to the current temperature according to the current temperature, and send the power supply control signal to the independent power supply, so that the independent power supply supplies power to the heating device according to the power supply control signal.
5. The ionization chamber according to claim 2, wherein the power supply device is a radiotherapy system, connected to the first temperature sensor, for receiving the current temperature and adjusting the power supply applied to the heating device according to the current temperature.
6. The ionization chamber of claim 1, further comprising:
and the second temperature sensor is arranged on the inner wall of the ionization chamber body and used for detecting the internal temperature of the ionization chamber.
7. The ionization chamber according to claim 1, characterized in that the heating means comprise a heating layer and/or at least one heating resistor.
8. The ionization chamber of claim 7, further comprising:
and the heat conduction device is paved between the periphery of the ionization chamber and the heating device and is used for conducting heat conduction on heat released by the heating device.
9. The ionization chamber of claim 1, further comprising:
at least one convection device is arranged outside the ionization chamber and used for adjusting the air convection velocity of the ionization chamber.
10. A method of controlling the temperature of an ionization chamber, comprising:
the power supply device receives a power supply control signal;
and powering the heating device based on the power supply control signal so as to enable the temperature of the ionization chamber to be within a preset temperature range.
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| CN207373544U (en) * | 2017-09-26 | 2018-05-18 | 仁新实业发展（信阳）有限公司 | The heating and heat-insulating device of resin container in a kind of artificial quartz in lump production process |
| CN110261883A (en) * | 2019-06-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Dose monitoring device and radiotherapy unit |
| CN110513879A (en) * | 2019-09-26 | 2019-11-29 | 南京林业大学 | Temperature control device, method and system |
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