CN106621075B - Radiotherapy device - Google Patents
Radiotherapy device Download PDFInfo
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- CN106621075B CN106621075B CN201611197083.3A CN201611197083A CN106621075B CN 106621075 B CN106621075 B CN 106621075B CN 201611197083 A CN201611197083 A CN 201611197083A CN 106621075 B CN106621075 B CN 106621075B
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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
- A61N5/1001—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy
- A61N5/1028—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy using radiation sources applied onto the body
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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
- A61N2005/1092—Details
- A61N2005/1094—Shielding, protecting against radiation
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to the field of radiotherapy, and provides a radiotherapy device, which comprises a main body bracket; the treatment arm is fixed to one side of the main body support at one end, the other end of the treatment arm extends outwards, the treatment head is fixed to the other end of the treatment arm, and the treatment head is used for outputting beams; an electromagnetic shielding unit located at least partially in the path of the beam, the electromagnetic shielding unit comprising a conductor for shielding electromagnetic waves. The radiotherapy device provided by the invention can shield electromagnetic interference and simultaneously has negligible influence on the radiation field and the light field.
Description
Technical Field
The invention relates to the field of radiotherapy, in particular to a radiotherapy device capable of shielding electromagnetic radiation.
Background
With the development of linear accelerators and the increase of treatment precision, the electron linear accelerator plays an increasingly important role in the field of cancer treatment, and directly irradiates tumors in a patient body by generating X rays and electron beams so as to achieve the purpose of eliminating or reducing the tumors. In particular, the advent of magnetic resonance image-guided electron linacs has made possible the accurate treatment of organs that move with breathing, such as the lungs, chest, etc.
However, the electromagnetic fields in both the electron linac and the magnetic resonance apparatus may interfere with each other, for example, the strong magnetic field of the magnetic resonance apparatus may affect the normal operation of the electronic components in the electron linac, and the electromagnetic field in the electron linac may affect the uniformity and stability of the distribution of the magnetic field in the magnetic resonance apparatus. Therefore, a solution is required to effectively reduce the electromagnetic interference between the electron linear accelerator and other devices.
Disclosure of Invention
To overcome the deficiencies of the prior art, the present invention provides a radiation therapy device comprising: a main body support; the treatment arm is fixed to one side of the main body support at one end, the other end of the treatment arm extends outwards, the treatment head is fixed to the other end of the treatment arm, and the treatment head is used for outputting beams; an electromagnetic shielding unit located at least partially in the path of the beam.
Optionally, the electromagnetic shielding unit includes a first region and a second region, the first region is located on a path of the beam, and the second region is located outside the path of the beam.
Optionally, the size of the first region corresponds to a maximum radiation field of the radiotherapy device.
Optionally, the electromagnetic shielding unit includes a conductor for shielding electromagnetic waves.
Optionally, the conductors have a space therebetween in the first region.
Optionally, within the first region, the conductors are distributed in a grid.
Optionally, the conductor structure in the first region is different from the conductor structure in the second region.
Optionally, the radiotherapy device further comprises a cross wire, and the conductor and the cross wire are arranged in a staggered mode.
Optionally, the cross-hairs and the conductor are integrated on a transparent substrate.
Optionally, the electromagnetic shielding unit includes a plurality of layers of conductors of different materials.
Compared with the prior art, the radiotherapy device provided by the invention can also carry out electromagnetic shielding on the beam outlet window of the treatment head, so that the electromagnetic interference of the external environment or other devices to the radiotherapy device through the window can be reduced, and the electromagnetic interference of the radiotherapy device to the external environment or other devices through the window can also be reduced;
furthermore, the radiation therapy device provided by the invention can shield electromagnetic interference and simultaneously has negligible influence on the radiation field and the light field;
furthermore, the radiotherapy device provided by the invention can shield electromagnetic interference on the premise of hardly influencing the radiation field and the light field, and cannot influence the correction of the geometric center of the imaging receiving system by using the cross hairs.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a radiation therapy device provided by an embodiment of the present invention;
fig. 2(a) - (b) are schematic structural diagrams of an electromagnetic shielding unit provided by an embodiment of the present invention;
fig. 3 is a schematic bottom view of an electromagnetic shielding unit according to an embodiment of the present invention;
fig. 4 is a schematic bottom view of an electromagnetic shielding unit according to another embodiment of the present invention;
fig. 5 is a schematic view of the bottom surface and cross-hair integration of the electromagnetic shielding unit in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The radiotherapy device provided by the invention can effectively shield electromagnetic interference under the condition of hardly influencing a radiation field and a light field, and is particularly suitable for a radiotherapy device guided by a magnetic resonance image. For better illustration of the technical solution, the technical solution of the present invention is clearly and completely described herein by taking a linear accelerator as an example, but the scope of the present invention is not limited thereby.
Fig. 1 is a schematic structural diagram of a radiotherapy apparatus provided by an embodiment of the present invention. Referring to fig. 1, the radiotherapy apparatus comprises a linear accelerator 10, a patient bed 20. The linac 10 is used for generating a high-energy-level (e.g., megavoltage-level) beam (e.g., electron beam or X-ray) to treat a target region (including a tumor), and includes a main body frame 11, a treatment arm 12, and a treatment head 13, wherein the main body frame 11 is capable of rotating around a rotation axis a (as shown in fig. 1) to realize treatments at different angles, one end of the treatment arm 12 is fixed to one side of the main body frame, the other end of the treatment arm extends outwards, an accelerating tube for accelerating electrons to high energy is arranged inside the treatment arm, and the treatment head 13 is fixed to the other end of the treatment arm 12 and is used for energy distribution adjustment, conformal adjustment, dose monitoring and the like of the beam. The linac 10 may also include an Electronic Portal Imaging Device 14 (EPID) for receiving the beam for Imaging, for example, during radiation treatment, using the EPID to receive the beam in real time for Imaging, so that the setup can be verified in real time. The linac 10 is not limited by the present disclosure, and may also generate a kilovoltage beam for imaging the target.
The patient bed 20 is used to carry the patient and move the target to the isocenter O (fig. 1) of the linac 10, and the treatment head 13 directs a beam (e.g., a cone beam, with a beam center axis B as shown in fig. 1) toward the patient to treat the patient.
The accelerating tube is used for accelerating electrons injected from the electron gun to high energy under the action of a microwave electric field, and a plurality of precise components such as a primary collimator, a homogenizer, an ionization chamber, a tungsten gate, a multi-leaf grating and the like are contained in the treatment head 13 and are used for carrying out energy distribution adjustment, conformal adjustment, dose monitoring and the like on the beam. The internal function of the treatment head 13 depends on the components such as motor and electronic components, which are easily interfered by electromagnetic waves and generate electromagnetic interference, so that in order to reduce the interference of the electronic components to the external environment or the interference of the electromagnetic waves of other devices to the electronic components, the radiotherapy device provided by the invention further comprises an electromagnetic shielding unit 15 for shielding the electromagnetic waves of the external environment or other devices; and may also reduce or avoid electromagnetic interference of the radiotherapy device with other electromagnetically sensitive devices.
In the present embodiment, the electromagnetic shielding unit 15 surrounds the accelerating tube and the therapy head 13, where surrounding means that the electromagnetic shielding unit is also disposed at the window of the therapy head 13 for beam outgoing. In general, the radiotherapy apparatus comprises a housing, inside which an electromagnetic shielding unit 15 can be arranged, enclosing the acceleration tube and the treatment head 13. Preferably, the electromagnetic shielding unit 15 is fixed inside the housing so that the electromagnetic shielding unit 15 does not move relatively even if the main body support 11 rotates about the rotation axis a during the radiotherapy, thereby preventing collision with the acceleration tube and/or components inside the treatment head 13 and unnecessary loss. The electromagnetic shielding unit 15 may be fixed to the inside of the case by conventional technical means, and the fixing manner thereof is not limited in the present invention. In other embodiments, if the inner elements of the treatment head 13 do not need to be electromagnetically shielded, the electromagnetic shielding unit 15 need only surround the components that need shielding.
The electromagnetic shielding unit 15 includes a conductor for performing electromagnetic shielding. Fig. 2 is a schematic structural diagram of an electromagnetic shielding unit according to an embodiment of the present invention. Referring to fig. 2, the electromagnetic shielding unit 15 is a layer of conductor, as shown in fig. 2(a), for example, the electromagnetic shielding unit 15 is a metal shielding layer or a shielding conductive paint, the shielding conductive paint is a paint that can be used for spraying, and the paint film can be dried to perform a conductive function, so that the electromagnetic interference shielding function is provided, the shielding conductive paint can be sprayed on the inner surface of the housing, the problem of electromagnetic interference can be solved, the operation is simple, and the occupied space is small; the electromagnetic shielding unit 15 may also include a plurality of layers of conductors made of different materials to enhance the shielding effect, and fig. 2(b) only shows that the electromagnetic shielding unit 15 includes two layers of conductors 151 and 152, but the number of layers of conductors in the present invention is not limited by the disclosure of the present embodiment.
In order to increase the stability of the electromagnetic shielding unit 15, in other embodiments, the electromagnetic shielding unit 15 may further include a substrate to which the conductor is fixed. The conductor can be arranged on one side of the substrate, can also be arranged on two sides of the substrate, or is arranged between two layers of substrates, as long as the substrate can support and fix the conductor, the invention does not limit the relative position of the conductor and the substrate and the bonding process.
In this embodiment, the electromagnetic shielding device 15 may be an integral body or may be a plurality of independent parts. For ease of installation, the electromagnetic shielding means 15 is preferably a plurality of separate parts. After the electromagnetic shielding device 15 is installed, the seam may be treated to prevent leakage of electromagnetic waves.
Therefore, the radiotherapy device provided by the embodiment can reduce the electromagnetic interference of the external environment or other devices to the radiotherapy device, and can also reduce the electromagnetic interference of the radiotherapy device to the external environment or other devices.
Since the treatment head 13 is used for outputting the beam to treat the patient, the electromagnetic shielding unit 15 is required to shield the electromagnetic wave without affecting the transmission of the beam.
As can be seen from fig. 1, the radiation beam for treatment passes through a part of the electromagnetic shielding unit 15, which is referred to herein as the bottom surface of the electromagnetic shielding unit 15. Fig. 3 is a schematic bottom view of an electromagnetic shielding unit according to an embodiment of the present invention. Referring to fig. 3, a region of the electromagnetic shielding unit 15 located on the beam path is referred to as a first region 15a, and the other regions of the electromagnetic shielding unit 15 are referred to as second regions 15b (including non-bottom surface regions). Since the beam for treatment passes through the first region 15a, in order for the first region 15a to effectively shield electromagnetic interference while not affecting the distribution of the beam intensity within the field, the thickness of the first region 15a is set to be thin enough so that its attenuation of the beam intensity is substantially negligible. The requirement of the first region 15a for the attenuation rate of the beam intensity may be different under different application conditions, and the first region 15a may be set to have a suitable thickness according to the specific requirement.
The size of the first region 15a is preferably the size of the corresponding beam, and since the shape and size of the beam may be constantly changed during the radiotherapy, the size of the first region 15a may be set to correspond to the maximum size of the beam, and in this embodiment, the size of the first region 15a corresponds to the maximum field of the radiotherapy device, that is, the projection size of the first region 15a on the isocenter plane coincides with the maximum field of the isocenter plane. In other embodiments, the projection size of the first region 15a on the isocenter plane is not smaller than the maximum radiation field on the isocenter plane, and the arrangement is such that the beam is within the range of the first region 15a and does not irradiate the second region 15b during radiation treatment regardless of the change in the shape and size of the beam, and therefore, the thickness of the second region 15b does not need to be considered to affect the beam, as long as electromagnetic interference can be reduced to a desired degree.
The conductive material in the first region 15a may or may not be the same as the conductive material in the second region 15b, and preferably, the material of the first region 15a may be a conductive material that has reduced attenuation or does not block the beam, and the material of the second region 15b does not need to consider the influence on the beam.
It can be seen that the radiation therapy device of the present embodiment shields electromagnetic interference while having negligible effect on the beam and thus on the dose distribution in the patient.
Because the radiation field can not be judged directly by visual observation, the radiation field is generally represented by adopting the light field consistent with the radiation field, so that a physicist can conveniently check and judge the accuracy of the radiation field. Therefore, in the present embodiment, the first region 15a does not affect the light field. With continued reference to fig. 3, the conductors in the first region 15a have spaces 16 therebetween for visible light to pass through. The size of the space 16 is related to the frequency of the electromagnetic interference, and the size of the space 16 is set according to the frequency of the electromagnetic wave to be shielded, so that the first region 15a can effectively shield the electromagnetic wave of the frequency while transmitting the visible light, and if the electromagnetic wave of a plurality of frequencies is provided, the size of the space 16 can be set according to the electromagnetic wave with the shortest wavelength.
In this embodiment, the distribution of the conductors is not limited, and may be a grid distribution, such as shown in fig. 3, or may be other distributions, such as a lattice distribution in fig. 4, as long as it satisfies that the first region 15a can effectively shield electromagnetic interference. If a substrate for supporting the conductors is also included in the first region 15a, the substrate material is preferably a transparent material, such as plastic, glass, etc., so as to minimize the effect on the optical field.
In this embodiment, the second region 15b does not need to consider the influence on the optical field, and therefore, the conductor structure in the second region 15b may be the same as or different from that in the first region 15 a. For example, the conductors in the first region 15a extend along the treatment head and the treatment arm, surrounding the treatment head and the treatment arm with a shield, such that there is a space between adjacent conductors in the first region 15a and the second region 15 b; alternatively, the conductors in the first region 15a are continuously distributed, with a space between adjacent conductors, and the conductors in the second region 15b are continuously distributed.
Therefore, the radiation therapy device in the embodiment can shield electromagnetic interference and simultaneously has negligible influence on the light field, so that a physicist can conveniently check and judge the accuracy of the light field.
In a radiation therapy device, a cross-hair may be mounted at the bottom of the treatment head 13 for correcting the geometric center of the image receiving system (e.g., EPID). The position of the geometric center of the imaging receiving system needs to be consistent with the beam path of the X-ray, namely the projection center of the cross hair and the geometric center of the imaging receiving system are consistent, if the projection center of the cross hair and the geometric center of the imaging receiving system are not consistent, the position of radiotherapy can be wrong, and the risk that healthy tissues of a patient are treated as tumor tissues to receive larger doses is caused. In order not to affect the correction of the geometric center of the imaging receiving system by using the cross wire, the conductors and the cross wires in the embodiment are arranged in a staggered manner, that is, when the geometric center of the imaging receiving system is corrected by using the cross wire, the projections of the conductors and the cross wires on the isocenter plane are not overlapped, so that the combination center of the imaging receiving system can still be corrected according to whether the projection center of the cross wire and the geometric center of the imaging receiving system are overlapped.
The bottom surface of the electromagnetic shielding unit 15 may be integrated with the cross wire. The cross hair has various shapes, such as cross hair, X-shaped cross hair, T-shaped cross hair, L-shaped cross hair, etc., and in this embodiment, the cross hair is taken as an example for description, but the scope of the invention is not limited thereto.
Fig. 5 is a schematic view of the bottom surface and cross-hair integration of the electromagnetic shielding unit in the embodiment of the present invention. Referring to fig. 5, the bottom surface of the electromagnetic shielding unit and the fork wires are integrated on the therapeutic head chassis, and are mounted on the radiotherapy apparatus through the therapeutic head chassis. The electromagnetic shielding unit comprises a first area 25a and a second area 25b, wherein in the first area 25a, a conductor grid 251 and a cross wire 252 are arranged on a transparent substrate, and a space 26 is arranged between adjacent conductors 251 for transmitting beams and visible light, so that a light field and a light field are formed on an isocentric plane; the second region 25b need not be beam and visible light concerned and may be a grid of conductors or a continuous distribution of conductors. As shown in fig. 5, on the transparent substrate, the center of the cross-hair 252 is still located on the beam central axis B, and the conductor mesh 251 and the cross-hair 252 are arranged offset, so that the correction of the geometric center of the image receiving system is hardly affected while electromagnetic shielding is performed.
In other embodiments, the bottom surface of the electromagnetic shielding unit and the cross-wires may not be integrated together, and the two may be separately and independently mounted on the therapeutic head chassis.
Therefore, the radiotherapy device in the embodiment can shield the electromagnetic interference on the premise of hardly influencing the radiation field and the light field, and cannot influence the correction of the geometric center of the imaging receiving system by using the cross wire.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A radiation therapy device comprises
A main body support;
the treatment arm is fixed to one side of the main body support at one end, the other end of the treatment arm extends outwards, the treatment head is fixed to the other end of the treatment arm, and the treatment head is used for outputting beams;
an electromagnetic shielding unit at least partially located in the path of the beam to shield electromagnetic interference caused to electronic components within the treatment head or to the external environment;
wherein the electromagnetic shielding unit includes a first region and a second region, the first region being located on a path of the beam, the second region being located outside the path of the beam; the electromagnetic shielding unit comprises a conductor for shielding electromagnetic waves; the conductors have a spacing therebetween in the first region.
2. The radiation therapy device of claim 1, wherein said first region has a size corresponding to a maximum field of the radiation therapy device.
3. Radiotherapeutic apparatus according to claim 1 wherein within the first region the conductors are arranged in a grid.
4. The radiation therapy device of claim 1, wherein said first-region conductor structure is different from said second-region conductor structure.
5. The radiation therapy device defined in claim 1, further comprising a cross-wire, wherein said conductor and said cross-wire are offset.
6. Radiotherapeutic apparatus according to claim 5 in which the cross-hairs and the conductor are integrated on a transparent substrate.
7. The radiation therapy device defined in claim 1, wherein the electromagnetic shielding unit comprises multiple layers of conductors of different materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611197083.3A CN106621075B (en) | 2016-12-22 | 2016-12-22 | Radiotherapy device |
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| CN201611197083.3A CN106621075B (en) | 2016-12-22 | 2016-12-22 | Radiotherapy device |
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| CN106621075A CN106621075A (en) | 2017-05-10 |
| CN106621075B true CN106621075B (en) | 2021-01-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107315923A (en) | 2017-08-14 | 2017-11-03 | 上海联影医疗科技有限公司 | A kind of system and method for adjusting Medical Devices |
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| US6198957B1 (en) * | 1997-12-19 | 2001-03-06 | Varian, Inc. | Radiotherapy machine including magnetic resonance imaging system |
| CN1429070A (en) * | 2001-12-27 | 2003-07-09 | 张会琴 | Electromagnetic shielded observation window |
| GB2393373A (en) * | 2002-09-13 | 2004-03-24 | Elekta Ab | MRI in guided radiotherapy and position verification |
| JP4616843B2 (en) * | 2003-12-02 | 2011-01-19 | ラディノバ アクテボラゲット | Multi-chamber irradiation treatment system |
| PL1948309T3 (en) * | 2005-10-17 | 2012-08-31 | Alberta Health Services | Integrated external beam radiotherapy and mri system |
| CN200950361Y (en) * | 2006-06-20 | 2007-09-19 | 厦门华联电子有限公司 | Internal screening device for infrared remote-control reception amplifier |
| DE102006059707B3 (en) * | 2006-12-18 | 2008-07-31 | Siemens Ag | Device for radiotherapy under image monitoring |
| DE102008007245B4 (en) * | 2007-02-28 | 2010-10-14 | Siemens Aktiengesellschaft | Combined radiotherapy and magnetic resonance device |
| CN105664378B (en) * | 2009-07-15 | 2019-06-28 | 优瑞技术公司 | For making linear accelerator and MR imaging apparatus method and apparatus shielded from one another |
| CN203658427U (en) * | 2013-11-19 | 2014-06-18 | 国家电网公司 | Shielding bag used by electric energy meter to resist electromagnetic interferences and prevent cover-opening electricity stealing |
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| CN101726502A (en) * | 2008-10-24 | 2010-06-09 | 通用电气公司 | System and method of fast kvp switching for dual energy ct |
| CN103458964A (en) * | 2011-05-11 | 2013-12-18 | 住友重机械工业株式会社 | Charged particle beam radiating device |
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