CN111773559A - Superconducting rotating frame for proton cancer treatment device - Google Patents
Superconducting rotating frame for proton cancer treatment device Download PDFInfo
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- CN111773559A CN111773559A CN202010644186.XA CN202010644186A CN111773559A CN 111773559 A CN111773559 A CN 111773559A CN 202010644186 A CN202010644186 A CN 202010644186A CN 111773559 A CN111773559 A CN 111773559A
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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
- A61N5/1077—Beam delivery systems
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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
- A61N5/1077—Beam delivery systems
- A61N5/1081—Rotating beam systems with a specific mechanical construction, e.g. gantries
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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
- A61N2005/1085—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy characterised by the type of particles applied to the patient
- A61N2005/1087—Ions; Protons
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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
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Abstract
The invention discloses a superconducting rotating frame for a proton cancer treatment device, belonging to the field of medical instruments. The superconducting rotating machine frame comprises a scanning treatment head, a vacuum system, a beam transmission system and a beam diagnosis system, wherein a plurality of mixed field type superconducting deflection magnets are arranged in the beam transmission system, the mixed field type superconducting deflection magnets provide a mixed magnetic field, the mixed magnetic field is formed by superposing a four-pole magnetic field, a six-pole magnetic field and other high-order magnetic fields on the basis of a two-pole deflection magnetic field, and the superconducting rotating machine frame has the functions of deflection, focusing and the like. The invention adopts the mixed field type superconducting magnet technology, reduces the total weight of the rotating rack and reduces the manufacturing cost of the rotating rack.
Description
Technical Field
The invention belongs to the field of medical instruments, and particularly relates to a superconducting rotating rack for a proton cancer treatment device.
Background
Proton cancer therapy is a very advantageous radiotherapy technique because proton energy deposition in the body has a bragg peak, and therefore, the proper proton energy and lateral irradiation range are selected, which can form the maximum dose irradiation at the tumor site in the patient. Compared with the traditional radiotherapy technologies such as X-ray, gamma ray, electron and the like, the method has the advantages of being more accurate and causing the peripheral normal tissues to be less damaged by irradiation, and is a development direction of a new generation of radiotherapy technology. Proton cancer treatment devices typically use cyclotron, synchrotron, or linear accelerator devices. The existing proton cancer treatment device usually designs a rotating rack for irradiating a patient in multiple angles, but the design scheme adopted by many rotating racks uses a normal-temperature magnet, and because a beam distribution system needs to realize multiple functions, the weight of rotating rack equipment is large and reaches hundreds of tons, and the manufacturing cost of the whole rotating rack is very expensive.
Disclosure of Invention
The invention aims to provide a superconducting rotating frame for a proton cancer treatment device, which adopts the technology of a mixed superconducting magnet, simplifies the beam line structure of the rotating frame, avoids overlarge envelope increase of beam in the transmission process of the rotating frame, and reduces the total cost.
The technical scheme of the invention is that the superconducting rotating frame for the proton cancer treatment device comprises a scanning treatment head, a vacuum system, a beam transmission system and a beam diagnosis system, and is characterized in that: the beam transmission system is provided with a plurality of mixed field type superconducting deflection magnets, the mixed field type superconducting deflection magnets are used for providing a mixed magnetic field, the mixed magnetic field is formed by superposing high-order magnetic fields such as a quadrupole magnetic field, a hexapole magnetic field and the like on the basis of a dipolar deflection magnetic field, and the mixed magnetic field has the functions of deflection, focusing and the like.
More than two mixed field type superconducting deflection magnets are arranged in the beam transmission system, and a slit is arranged between the mixed field type superconducting deflection magnets to select the energy of the beam.
A quadrupole lens group is added in the beam transmission system and used for adjusting beam parameters. The quadrupole lens groups can be symmetrically or asymmetrically arranged on two sides of the plane of the mixed field type superconducting deflection magnet.
The invention has the beneficial effects that:
the invention adopts the mixed field type superconducting deflection magnet technology, and controls the proton beam flow through the mixed field type superconducting deflection magnet, thereby realizing the rising, horizontal deflection and falling of the beam flow, and finally vertically irradiating the tumor part of a patient. The invention can greatly reduce the weight of the magnet on the whole bunch by using the mixed superconducting magnet, thereby reducing the total weight of the bunch on the whole rotary rack and reducing the manufacturing difficulty and the total cost of the rotary rack.
Drawings
FIG. 1 is a schematic view of a rotating gantry of the present invention for use in a proton cancer treatment apparatus;
FIG. 2 is a schematic view of a hybrid field superconducting deflection magnet of the present invention providing a hybrid magnetic field;
figure 1-scanning treatment head; 2- -vacuum system; 3-beam diagnosis system; 4- -mixed field superconducting deflection magnet.
Detailed Description
The invention is further illustrated by the following examples. It is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
The rotating frame for the proton accelerator comprises a scanning treatment head 1, a vacuum system 2, a beam diagnosis system 3 and a beam transmission system, wherein the scanning treatment head 1 comprises a scanning magnet and a dose detector and a position detector of a gas ionization chamber which are matched with the scanning magnet; the vacuum system 2 comprises a beam vacuum pipeline, a cavity, a vacuum pump and a valve; the beam diagnosis system 3 is used for monitoring information such as beam position, distribution and electric quantity in the beam vacuum pipeline and comprises a cavity BPM beam position detector and a gas ionization chamber position detector which are arranged along a beam line, and a gas ionization chamber dose detector and a position detector which are arranged at a treatment head; the beam transmission system is used for realizing the rising, horizontal deflection and falling of beams and is provided with one or more mixed field type superconducting deflection magnets 4, the mixed field type superconducting deflection magnets can provide a mixed magnetic field structure, the mixed magnetic field is formed by superposing high-order magnetic fields such as a four-pole magnetic field, a six-pole magnetic field and the like on the basis of a deflection magnetic field, and meanwhile, the mixed magnetic field has the functions of deflection, focusing and the like, so that the beam transmission can not be influenced by energy dissipation. The mixed field type superconductive deflection magnet of the present invention adopts CCT (housed Cosine theta) or DCT (discrete Cosine transform) superconductive magnet, etc.
Embodiment one of the invention
The invention provides a rotating frame comprising two mixed superconducting magnets, as shown in figure 1, firstly, a beam is changed from a first mixed superconducting magnet from horizontal to vertical upward or inclined upward, the deflection angle of the mixed deflection magnet is between 30 and 90 degrees, the deflection magnetic field is between 1.5T and 4.5T, the magnetic field gradient of a quadrupole magnetic field is 10 to 50T/m, the deflection radius is between 0.3 m and 1.2 m, meanwhile, energy selection can be carried out on the beam in the first mixed superconducting magnet, the energy selection function can be realized through the adjustment of the width of a slit behind the first mixed superconducting magnet, and the energy spectrum shape of the beam can be adjusted. After passing through the first mixed superconducting magnet, a beam diagnosis system, a BPM beam position detector or a gas ionization chamber position detector is installed and used for measuring beam parameters. After the beam diagnosis system, a quadrupole lens group (which can be optionally installed or not installed) is installed, beam parameters such as beam envelope size and the like are controlled by using the focusing function of the quadrupole lens group, and the magnetic field gradient of a quadrupole magnetic field is 10-50T/m. And a second mixed superconducting magnet is arranged behind the quadrupole lens to adjust the beam in the beam direction vertically upwards or obliquely downwards to a vertically downwards direction, the deflection angle of the mixed deflection magnet in the deflection transmission section is between 120 and 180 degrees, the deflection magnetic field is between 1.5 and 4.5T, the magnetic field gradient of the quadrupole magnetic field is 10 to 50T/m, and the deflection radius is between 0.3 and 1.2 meters. The treatment head is provided with two scanning magnets for scanning in the x direction and the y direction respectively, two beam position detectors are arranged behind the two scanning magnets for beam position measurement, two beam dose detectors are arranged behind the two beam position detectors, and the beam is irradiated in a large irradiation field by a scanning method.
Embodiment two of the invention
The invention provides three mixed field type superconducting deflection magnets, which are characterized in that a beam current is firstly guided by a first mixed field type superconducting deflection magnet, the deflection angle of a two-pole deflection magnetic field of the mixed field type superconducting deflection magnet is between 30 and 90 degrees, the deflection magnetic field is between 1.5T and 4.5T, the magnetic field gradient of a four-pole magnetic field is 10 to 50T/m, and the deflection radius is between 0.3 meter and 1.2 meters. The beam direction changes from horizontal to vertically or obliquely upwards (between 30-90 degrees). After passing through the first mixed-field superconducting deflection magnet, a beam diagnosis system, a BPM beam position detector or a gas ionization chamber position detector is installed and used for measuring beam parameters. After the beam diagnosis system, a quadrupole lens group (which can be optionally installed or not) is installed, beam parameters such as beam envelope size and the like are controlled by using the focusing function of the quadrupole lens group, the envelope size is usually between 10mm and 60mm, the magnetic field gradient of the quadrupole lens is between 5 and 30T/m, and the aperture is 40 to 100 mm. And a second mixed field type superconducting deflection magnet is arranged behind the quadrupole lens to adjust the beam in the direction of the beam vertically upwards or obliquely upwards to the horizontal direction, a quadrupole lens group (which can be optionally arranged or not arranged) is arranged behind the second mixed field type superconducting deflection magnet to control beam parameters such as the beam envelope size, and the parameter range of the quadrupole lens is the same as that of the first block. And a gas ionization chamber is arranged behind the quadrupole lens group to measure beam position parameters. And a third mixed field type superconducting deflection magnet is arranged behind the gas ionization chamber, and deflects the beam current from the horizontal direction to the vertical downward direction. The treatment head is provided with two scanning magnets for scanning in the x direction and the y direction, two beam position detectors for beam position measurement are arranged behind the two scanning magnets, two beam dose detectors are arranged behind the two beam position detectors, and the beam is irradiated in a large irradiation field by a scanning method
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (4)
1. A superconductive rotating frame for a proton cancer treatment device comprises a scanning treatment head, a vacuum system, a beam transmission system and a beam diagnosis system, and is characterized in that: the beam transmission system is provided with a plurality of mixed field type superconducting deflection magnets, the mixed field type superconducting deflection magnets are used for providing a mixed magnetic field, the mixed magnetic field is formed by superposing high-order magnetic fields such as a four-pole magnetic field, a six-pole magnetic field and the like on the basis of a two-pole deflection magnetic field, and the mixed magnetic field has the functions of deflection, focusing and the like.
2. A superconducting rotating gantry for a proton cancer therapy device according to claim 1, wherein a slit is installed between the mixed-field superconducting deflection magnets, and the slit is used for energy selection of beam current.
3. A superconducting rotating gantry for a proton cancer treatment apparatus as claimed in claim 1, wherein a quadrupole lens set is added to the beam delivery system, and is used for beam parameter adjustment.
4. A superconducting rotating gantry for a proton cancer therapy device according to claim 3, wherein said quadrupole lens groups are symmetrically or asymmetrically arranged on both sides of the plane of the mixed-field superconducting deflection magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010644186.XA CN111773559A (en) | 2020-07-07 | 2020-07-07 | Superconducting rotating frame for proton cancer treatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010644186.XA CN111773559A (en) | 2020-07-07 | 2020-07-07 | Superconducting rotating frame for proton cancer treatment device |
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| CN111773559A true CN111773559A (en) | 2020-10-16 |
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| CN202010644186.XA Pending CN111773559A (en) | 2020-07-07 | 2020-07-07 | Superconducting rotating frame for proton cancer treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115397085A (en) * | 2022-09-19 | 2022-11-25 | 中国科学院近代物理研究所 | 360-degree normal-temperature rotary beam line capable of realizing multi-terminal distribution |
| CN115413105A (en) * | 2022-09-19 | 2022-11-29 | 中国科学院近代物理研究所 | 360 that can realize multi-terminal delivery o Superconducting rotating beam line |
-
2020
- 2020-07-07 CN CN202010644186.XA patent/CN111773559A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115397085A (en) * | 2022-09-19 | 2022-11-25 | 中国科学院近代物理研究所 | 360-degree normal-temperature rotary beam line capable of realizing multi-terminal distribution |
| CN115413105A (en) * | 2022-09-19 | 2022-11-29 | 中国科学院近代物理研究所 | 360 that can realize multi-terminal delivery o Superconducting rotating beam line |
| CN115397085B (en) * | 2022-09-19 | 2023-04-14 | 中国科学院近代物理研究所 | 360-degree normal-temperature rotary wire harness capable of achieving multi-terminal distribution |
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Application publication date: 20201016 Assignee: Beijing Rui de Kang Technology Co.,Ltd. Assignor: Peking University Contract record no.: X2023980041624 Denomination of invention: A superconducting rotating frame for proton cancer treatment equipment License type: Exclusive License Record date: 20230912 |