CN109646819B - Deflection bracket of accelerator - Google Patents
Deflection bracket of accelerator Download PDFInfo
- Publication number
- CN109646819B CN109646819B CN201811641321.4A CN201811641321A CN109646819B CN 109646819 B CN109646819 B CN 109646819B CN 201811641321 A CN201811641321 A CN 201811641321A CN 109646819 B CN109646819 B CN 109646819B
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- rotating shaft
- swing
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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
-
- 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
- A61N5/1064—Monitoring, verifying, controlling systems and methods for adjusting radiation treatment in response to monitoring
-
- 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
- A61N5/1049—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam
- A61N2005/1056—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam by projecting a visible image of the treatment field
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The invention provides an accelerator deflection bracket which is used for a radiotherapy device guided by a contrast imaging device, wherein the deflection bracket is a gantry bracket and is directly connected with two sides of the contrast imaging device in a bridging way or is arranged on the outer side of the contrast imaging device through a connecting piece; the upper part of the swinging bracket is connected with an accelerator head, the swinging bracket is provided with a swinging bracket rotating shaft, and a swinging driving device is arranged on the swinging bracket and can drive the swinging bracket to swing around the swinging bracket rotating shaft, so that the accelerator head is driven to swing around the swinging bracket rotating shaft. The deflection bracket provided by the invention can deflect the radioactive source to avoid the irradiation to the normal human tissues when the normal human tissues shield the tumor, shortens the radiotherapy time of patients and increases the radiotherapy effect.
Description
Technical Field
The invention relates to the technical field of radiotherapy equipment and instruments, in particular to an accelerator deflection bracket.
Background
Malignant tumors are one of the major threats facing current human health and present a yearly rising trend. Radiotherapy achieves treatment of tumors by irradiation with high-energy radiation. Because high-energy rays can kill tumor cells and damage normal tissue cells, accuracy is a key factor of radiotherapy technology.
In the current research work of radiotherapy systems carried out at home and abroad, a radioactive source machine head can only rotate around a sickbed to carry out single-dimensional radiotherapy on tumor parts of patients. For example, MRIdian of ViewRay in the united states of america uses a rotating gantry to mount three Co60 remote treatment heads to effect tumor localization and treatment. The university of Canadian Alberta CCI (Cross Cancer Institute) couples the magnetic resonance imaging system and the linear accelerator together through a portal ring, and the rotation of the portal drives the rotation radiation of the radiation system, but the radiation source machine head can only rotate around a sickbed and cannot do multi-angle and multi-plane radiation therapy.
When the accelerator radioactive source head is used for carrying out single-dimensional radiotherapy around a tumor of a patient, if normal human tissues shield the tumor, the normal tissues of the human body can be damaged. In order to avoid the damage of the normal tissue which shields the tumor, the positioning irradiation treatment in different directions is needed, or the radioactive source is turned off when the normal tissue which shields the tumor is irradiated, and the radioactive source is turned on when the normal tissue is bypassed.
The operation not only increases the time and the positioning difficulty of the radiotherapy of the patient, but also generally avoids the damage to human tissues due to the limited moving distance of the treatment bed, limited adjusting range of the machine head and the like.
Disclosure of Invention
In view of the above, the invention provides an accelerator deflection bracket, which aims to solve the existing problems.
The invention provides an accelerator deflection bracket which is used for a radiotherapy device guided by a contrast imaging device, wherein the deflection bracket is a gantry bracket and is directly bridged on two sides of the contrast imaging device or is arranged on the outer side of the contrast imaging device through a connecting piece; the upper part of the swinging bracket is connected with an accelerator head, the swinging bracket is provided with a swinging bracket rotating shaft, and a swinging driving device is arranged on the swinging bracket and can drive the swinging bracket to swing around the swinging bracket rotating shaft, so that the accelerator head is driven to swing around the swinging bracket rotating shaft.
Further, a machine head deflection driving positioning device is arranged above the deflection support, and can drive the accelerator machine head to do rotary deflection motion around the shaft, and can measure and feed back the deflection position.
Further, driving devices are arranged on two sides of the deflection bracket.
Furthermore, the two sides of the deflection bracket are respectively provided with a centering device.
Further, the aligning device includes: the eccentric shaft is connected with the eccentric shaft locking nut; the eccentric shaft passes through the deflection bracket to be connected with the roller bearing, and is locked by the eccentric shaft locking nut.
Further, the number of the aligning holes is 4.
Further, the deflection bracket is also provided with a position detection device.
Further, the position detecting device is a rotary encoder or a grating ruler.
Further, a balancing weight is arranged below the deflection bracket.
Further, the balancing weight is a metal block.
The deflection bracket provided by the invention can realize multi-dimensional continuous rotation irradiation treatment of the accelerator radioactive source on the tumor, and can deflect the radioactive source to avoid irradiation on normal human tissues when the normal human tissues shield the tumor, so that the radiation treatment time of a patient is shortened, and the radiation treatment effect is improved. The accelerator adjusting device is used for a radiotherapy system guided by an image and is used for solving the problem that the existing product can only carry out single-dimensional radiotherapy.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic view of an accelerator yaw support according to an embodiment of the present invention;
FIG. 2A is a schematic diagram of a centering device of an accelerator yaw support according to an embodiment of the present invention;
fig. 2B is a schematic structural diagram of a centering device of an accelerator yaw bracket according to an embodiment of the present invention;
FIG. 3A is a schematic diagram showing a relationship between an accelerator deflection bracket and an image contrast device according to an embodiment of the present invention;
FIG. 3B is a second schematic diagram of a configuration relationship between an accelerator deflection bracket and an image contrast device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an image contrast apparatus guided radiotherapy apparatus with an accelerator deflection cradle according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of normal tissue evasion illumination of an image contrast device-guided radiotherapy device having an accelerator deflection cradle in accordance with an embodiment of the present invention;
FIG. 6A is a schematic diagram showing a balancing weight effect of an accelerator yaw support according to an embodiment of the present invention;
FIG. 6B is a diagram illustrating a second exemplary embodiment of a balancing weight effect of an accelerator yaw support according to the present invention;
1. the device comprises an accelerator machine head, 2 parts of a deflection bracket, 3 parts of a machine head bearing frame, 4 parts of a balancing weight, 5 parts of a connecting column, 6 parts of a deflection bracket driving device, 7 parts of a position detection device, 8 parts of a centering device, 9 parts of a machine head deflection driving positioning device, 10 parts of an image contrast device, 11 parts of a contrast device bracket, 12 parts of a contrast device rotary bearing, 13 parts of a contrast device rotary shaft, 14 parts of a deflection bracket rotary shaft, 15 parts of a machine head deflection rotary shaft, 16 parts of a patient, 17 parts of a system and the like, 19 parts of normal tissues of a human body, 20 parts of a tumor, 21 parts of a fixing screw, 22 parts of an eccentric shaft locking nut, 23 parts of an eccentric shaft, 24 parts of a bearing roller, 25 parts of a centering hole, 26 parts of a ray bundle, 27 parts of a main shielding area, 28 parts of a treatment room, 29 parts of a connecting piece.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 and 4, a deflection bracket 2 of a radiotherapy apparatus for guiding an image contrast apparatus according to an embodiment of the present invention is shown; the deflection bracket 2 is a gantry bracket, an accelerator head 1 is connected above the deflection bracket, and an emission source and a multi-leaf collimator (MLC) are arranged in the accelerator head 1 and are used for emitting rays to carry out radiotherapy on tumors; the deflection bracket 2 is provided with a deflection bracket rotating shaft 14, and a deflection driving device 6 is arranged on the deflection bracket and can drive the deflection bracket 2 to deflect around the deflection bracket rotating shaft 14, so that the accelerator head 2 is driven to deflect around the deflection bracket rotating shaft 14. Specifically, the deflection bracket 2 is connected with a machine head bearing frame 3 through a connecting column 5, and the accelerator machine head 1 is positioned on the machine head bearing frame 3; the deflection bracket 2 can also be directly connected with the machine head bearing frame 3.
The deflection bracket 2 can be directly connected across the two sides of the imaging device 10, as shown in fig. 3A, so that the accelerator head and the imaging device 10 rotate simultaneously to perform radiotherapy on tumors, or as shown in fig. 3B, is arranged outside the imaging device 10 through a connecting piece 29, so that the accelerator head can perform rotary radiotherapy independently or can perform radiotherapy simultaneously with the imaging device 10.
Further, a nose deflection driving positioning device 9 may be further disposed above the deflection bracket 2, specifically, the nose deflection driving positioning device 9 is also located on the nose carrier 3, and can drive the accelerator nose 2 to perform a rotary deflection motion around an accelerator nose deflection rotating shaft 15, and can measure and feed back a deflection position.
The structure and operation of the yaw support of the present invention will be described in detail below with reference to fig. 1-6, in conjunction with a first configuration relationship between the accelerator yaw support and the image contrast device.
As shown in fig. 4, an image contrast apparatus guided radiotherapy apparatus has a yaw support 2 as shown in fig. 1, which spans and is mounted on two sides of the image contrast apparatus 10, and is fixed on the image contrast apparatus 10 by a fixing screw 21, and the yaw support 2 is driven synchronously by two sides to drive the accelerator head 1 and the whole adjusting device to yaw around a yaw support rotation axis 14. The image contrast device 10 is used for scanning and imaging tumor of a patient, and carries out accurate radiotherapy on the tumor through an image-guided radiotherapy device, the image contrast device 10 comprises nuclear magnetism MRI, CT, DR and the like, the whole set of radiotherapy device is fixed and supported through a contrast device bracket 11, and the contrast device bracket 11 is arranged on the image contrast device 10 through a contrast device slewing bearing 12, so that the image contrast device can do slewing motion around a contrast device slewing shaft 13.
As shown in fig. 5, when the accelerator head 1 continuously rotates around the rotation shaft 13 of the radiography device to perform iso-center irradiation on the tumor 20, if the normal tissue 19 of the human body shields the tumor 20 within a certain rotation range on the rotation irradiation path of the accelerator head 1 on the tumor 20, the radiation must pass through the normal tissue 19 of the human body to irradiate the tumor 20, so that the radiation may damage the normal tissue 19 of the human body, and radiation irradiation on the normal tissue of the human body is avoided as much as possible during radiotherapy.
When continuous isocentric radiotherapy for avoiding normal human tissue 19 is performed, firstly, the tumor 20 and peripheral normal human tissue 19 of a patient 16 are scanned and imaged by an image radiography device 10, the relative positions and the outline shape of the rotation center 17, the tumor 20 and the normal human tissue 19 needing to avoid irradiation are determined, the irradiation path for the isocentric radiotherapy for the tumor 20 is calculated by a radiotherapy system control host computer, and meanwhile, the irradiation path for avoiding the normal human tissue 19 by the accelerator handpiece 1 is planned according to the outline of the normal human tissue 19.
Because the accelerator head 1 in the embodiment of the invention rotates around the contrast device revolving shaft 13 and the deflection bracket 2 can perform deflection movement around the deflection bracket revolving shaft 14 under the drive of the deflection bracket driving device 6, the accelerator head 1 fixed on the deflection bracket 2 is driven to perform deflection movement around the deflection bracket revolving shaft 14, and therefore the accelerator head 1 performs two-dimensional rotation movement around the contrast device revolving shaft 13 and the deflection bracket revolving shaft 14. According to the planned path of the main control unit of the radiotherapy system, which is designed to avoid the normal tissue 19 of the human body, the positions and the speeds of the accelerator head 1 around the rotating shaft 13 of the contrast device and the rotating shaft 14 of the deflection bracket can be respectively controlled, so that the accelerator head 1 can carry out irradiation treatment along the planned path, and the adjustable space is large, thereby ensuring that the normal tissue 19 of the human body is avoided, and avoiding the normal tissue of the human body from being irradiated by rays as much as possible.
Further, as shown in fig. 1 and 4, the yaw support 2 is further provided with a yaw support position detection device 7, which can use a high-precision rotary encoder or a grating ruler to detect the speed and the position of the feedback yaw support 2 when the yaw support rotates around the yaw support rotating shaft 14 in real time, so that the accelerator head 1 can be accurately controlled to accurately perform irradiation treatment along a planned path, and simultaneously, when the yaw support driving device 6 fails, the device can timely alarm and stop, thereby ensuring the safety of the treatment process.
Further, since the yaw support 2 is a gantry support, and a structure with two sides crossing the gantry support is adopted, due to the fact that accumulated errors may exist in the mechanical structure during processing and assembling, the situation of non-concentricity after the installation of the two sides of the yaw support 2 may be caused, so that driving resistance of the yaw support driving device 6 may be increased, uneven stress and distortion of the two sides of the yaw support 2 may be caused, and even irradiation treatment precision of the accelerator handpiece 1 may be affected. Therefore, deflection bracket aligning devices 8 are designed on two sides of the deflection bracket 2.
The aligning device 8 has a structure as shown in fig. 2a and 2b, and the aligning device 8 includes: eccentric shaft locking nut 22, eccentric shaft 23, bearing roller 24 and aligning hole 25; the aligning hole 25 is arranged on the image contrast device 10, the center of the aligning hole 25 is positioned on the deflection bracket rotating shaft 14, a plurality of roller bearings 24 are arranged in the aligning hole 25, and the eccentric shaft 23 penetrates through the deflection bracket 2 to be connected with the roller bearings 24 and is locked by the eccentric shaft locking nut 22. If the accelerator head adjustment device is in a second configuration with the image contrast apparatus, the alignment aperture 25 is located on the connector 29.
When the device is used, the fixing screws 21 fixed on the imaging device 10 at two sides of the deflection bracket 2 are loosened, the eccentric shaft locking nuts 22 are loosened, the eccentric shafts 23 at two sides of the deflection bracket aligning device 8 are respectively rotated and adjusted to drive the bearing rollers 24 to deflect in the aligning holes 25 of the imaging device, the rotating shafts 14 of the deflection bracket are adjusted to coincide with the central shafts of the aligning holes 25 of the bracket, and after the two sides of the deflection bracket 2 are simultaneously adjusted to be concentric and coincident, the eccentric shaft locking nuts 22 and the fixing screws 21 at two sides of the deflection bracket 2 are locked.
Further, as shown in fig. 6A, a counterweight 4 is further disposed below the yaw support in the embodiment of the present invention, and corresponds to the accelerator head 1. Because the accelerator machine head 1 has a heavy weight due to the functional structure requirement, when one end of the deflection bracket 2 rotates along the deflection bracket rotating shaft 14, the deflection bracket driving device 6 is driven to be stressed unevenly to influence the operation stability of the deflection bracket, so that the other end of the deflection bracket 2 is provided with a high-density balancing weight 4 which has the same weight as the accelerator machine head 1 in order to ensure the operation stability, and the deflection bracket driving device 6 can be driven to be stressed evenly and operate stably.
Preferably, the weight 4 is a metal block. Referring to fig. 6B, during radiation therapy, the accelerator handpiece 1 emits a beam 26, and a part of energy of the beam 26 is used for tumor irradiation therapy and the rest is irradiated outwards, so that shielding and absorption of the redundant beam 26 are required to prevent injury to other personnel and equipment. As shown in fig. 6B, the radiotherapy apparatus is installed in the treatment room 28, and when the accelerator head 1 rotates around the rotation axis 13 of the radiography apparatus to perform irradiation treatment, that is, the radiation beam 26 also rotates around the rotation axis 13 of the radiography apparatus, so that a shielding layer having a certain width, that is, a main shielding area 27, needs to be formed at a position of the treatment room 28 corresponding to the rotation position of the radiation beam 26 in order to shield and absorb radiation. Because the beam 26 is relatively high in energy, the primary shielding region needs to be made of a large thickness to completely shield and absorb the excess radiation, which results in a large space occupation of the treatment room 28 and an increase in construction costs. And through installing the balancing weight 4 that is equivalent with accelerator aircraft nose 1 weight at the beat support 2 other end, balancing weight 4 adopts high density metal material to make, can effectively absorb shielding ray energy for the ray bundle 26 passes behind balancing weight 4 energy decay by a wide margin, consequently the thickness of main shielding region 27 greatly reduced, thereby reaches to increase treatment room 28 space, reduces construction cost.
In summary, the deflection bracket of the radiotherapy accelerator provided by the embodiment of the invention can solve the problem that the existing product can only carry out single-dimensional radiotherapy. The multi-dimensional continuous rotation irradiation treatment of the accelerator radioactive source to the tumor can be realized, the radiation source deflection can be carried out to avoid the irradiation to the normal human tissue when the normal human tissue shields the tumor, the radiation treatment time of the patient is shortened, and the radiation treatment effect is improved. Furthermore, the high-density material balancing weight is arranged below the deflection bracket, so that the stress at two ends of the deflection bracket can be balanced, the problem of unbalanced driving force of the deflection bracket is solved, and meanwhile, a part of rays can be shielded and absorbed by selecting the material of the balancing weight, so that the shielding layer of the main shielding area of the treatment room is thinned, the space of the treatment room is increased, and the construction cost of the treatment room is reduced.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. The accelerator deflection bracket is used for a radiotherapy device guided by a contrast imaging device and is characterized in that the deflection bracket is a gantry bracket and is directly connected with two sides of the contrast imaging device in a bridging way or is arranged on the outer side of the contrast imaging device through a connecting piece so that the deflection bracket can do rotary motion along with the contrast imaging device around a rotary shaft of the contrast imaging device; the upper part of the swing bracket is connected with an accelerator head, the swing bracket is provided with a swing bracket rotating shaft, and a swing driving device is arranged on the swing bracket and can drive the swing bracket to swing around the swing bracket rotating shaft so as to drive the accelerator head to swing around the swing bracket rotating shaft;
The method comprises the steps that when the accelerator head rotates around a rotating shaft of the contrast device, the deflection support is driven by the deflection driving device to perform deflection movement around the rotating shaft of the deflection support, so that the accelerator head fixed on the deflection support is driven to perform deflection movement around the rotating shaft of the deflection support, and the accelerator head performs rotation movement in two dimensions around the rotating shaft of the contrast device and the rotating shaft of the deflection support;
The machine head deflection driving and positioning device is arranged above the deflection bracket, and can drive the accelerator machine head to do rotary deflection motion around the shaft and can measure and feed back the deflection position;
both sides of the deflection bracket are provided with deflection driving devices;
the two sides of the deflection bracket are also respectively provided with a centering device;
the aligning device includes: the eccentric shaft is connected with the eccentric shaft locking nut; the eccentric shaft penetrates through the deflection bracket to be connected with the roller bearing, and is locked by the eccentric shaft locking nut;
When the device is used, the fixing screws on two sides of the deflection bracket are fixed on the contrast imaging equipment are loosened, the eccentric shaft locking nuts are loosened, the eccentric shafts on two sides of the deflection bracket aligning device are respectively rotated and adjusted to drive the bearing rollers to deflect in the aligning holes of the contrast imaging equipment, the rotating shafts of the deflection bracket are adjusted to coincide with the central shafts of the supporting aligning holes, and after the two sides of the deflection bracket are simultaneously adjusted to be concentric and coincident, the eccentric shaft locking nuts and the fixing screws on two sides of the deflection bracket are locked;
The balancing weight is also arranged below the deflection bracket, is made of a metal block, is made of a high-density metal material, and can effectively absorb and shield the energy of rays, so that the energy of the ray bundle after passing through the balancing weight is greatly attenuated.
2. The yaw support of claim 1 wherein the number of aligning holes is 4.
3. The yaw support of claim 1, wherein the yaw support is further provided with a position detection device.
4. A yaw support according to claim 3 wherein the position detection means is a rotary encoder or a grating scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811641321.4A CN109646819B (en) | 2018-12-29 | 2018-12-29 | Deflection bracket of accelerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811641321.4A CN109646819B (en) | 2018-12-29 | 2018-12-29 | Deflection bracket of accelerator |
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| CN109646819A CN109646819A (en) | 2019-04-19 |
| CN109646819B true CN109646819B (en) | 2024-07-16 |
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| CN201811641321.4A Active CN109646819B (en) | 2018-12-29 | 2018-12-29 | Deflection bracket of accelerator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112401918B (en) * | 2020-10-27 | 2025-01-17 | 佛山瑞加图医疗科技有限公司 | Medical patient support device |
| CN113870251B (en) * | 2021-10-19 | 2022-08-26 | 中南大学湘雅二医院 | Heart image processing method for accurate positioning of radiotherapy |
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