CN109646820B - Accelerator head liftable adjusting device, radiotherapy equipment and control method - Google Patents
Accelerator head liftable adjusting device, radiotherapy equipment and control method Download PDFInfo
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- CN109646820B CN109646820B CN201811654694.5A CN201811654694A CN109646820B CN 109646820 B CN109646820 B CN 109646820B CN 201811654694 A CN201811654694 A CN 201811654694A CN 109646820 B CN109646820 B CN 109646820B
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- 238000001959 radiotherapy Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title abstract description 15
- 238000003384 imaging method Methods 0.000 claims description 31
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000002601 radiography Methods 0.000 description 12
- 230000005855 radiation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 206010028980 Neoplasm Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002595 magnetic resonance imaging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
Classifications
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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
-
- 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
- A61N5/1042—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy with spatial modulation of the radiation beam within the treatment head
-
- 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
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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
-
- 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 head lifting adjusting device, radiotherapy equipment and a control method. The adjusting device of the present invention comprises: the device comprises a base, wherein the upper surfaces of the two ends of the base are fixedly connected with stand columns, the height of each stand column is adjustable, the upper ends of the stand columns are fixedly connected with a machine head bearing frame, an accelerator machine head and a machine head deflection driving positioning device are arranged on the machine head bearing frame, and the machine head deflection driving positioning device can drive the accelerator machine head to do rotary deflection motion around a shaft and can measure and feed back deflection positions. The adjusting device solves the problem that the irradiation intensity received by each part of the scanned object is inconsistent due to the fact that the scanning center point is different from the equipment center point caused by the limitation of the equipment structure.
Description
Technical Field
The invention relates to the technical field of image-guided radiotherapy equipment, in particular to an accelerator head lifting adjusting device, radiotherapy equipment and a control method.
Background
In the current research work of radiotherapy systems carried out at home and abroad, the radioactive source handpiece can only rotate around the sickbed. For example, MRIdian from ViewRay in the united states of america mounts three Co60 radiation source heads via a rotating gantry. 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 perform multi-angle and multi-plane irradiation.
These devices are designed based on an ideal irradiation mode, i.e. assuming that the scanning center point can be positioned on the system center point by moving the treatment couch, etc., the head of the accelerator rotates around the system center point, so that the isocentric rotation of the scanning center point can be realized. In this case, since the scanning center point is located at the rotation center of the radiation source, the distance between the accelerator head and the scanning center point is a fixed value at each point in the rotation process of the accelerator head, and the intensity at the scanning center point is not changed due to factors such as the distance.
However, in practical application, due to different types, structures and imaging principles of the contrast device, the movement distance of the treatment couch is limited and the treatment couch cannot be randomly positioned, so that the position of the scanning center point may deviate from the center point of the system, and therefore, the scanning center point cannot be ensured, and the irradiation intensity received by the positions on the rotating track of the system is consistent.
Disclosure of Invention
In view of the above, the invention provides an accelerator head lifting adjusting device, radiotherapy equipment and a control method thereof, and aims to solve the existing problems.
The invention provides an accelerator head lifting adjusting device, which is used for radiotherapy equipment guided by image equipment and comprises the following components: the machine head supporting frame comprises a base, wherein connecting upright posts are fixedly arranged on the upper surfaces of two ends of the base, the upper ends of the upright posts are fixedly connected with a machine head supporting frame, the upright posts comprise lifting rods and brackets, one ends of the lifting rods are connected to the lower surface of the machine head supporting frame, and the other ends of the lifting rods are connected to the brackets; the machine head bearing frame is provided with an accelerator machine head and a machine head deflection driving positioning device, and the machine head deflection driving positioning device can drive the accelerator machine head to do rotary deflection motion around a shaft and can measure and feed back deflection positions.
Further, the number of the lifting rods is four, and the lifting rods are respectively connected to two ends of the machine head bearing frame in a pairwise manner.
Further, the lifting rod is a guide rail type lifting rod or a screw lifting rod. Preferably a screw lift rod.
Further, the screw rod lifter includes: the lifting column is sleeved with the lifting seat through a sliding guide sleeve, a motor is fixed at the bottom of the lifting seat, the motor is connected with a ball screw through a coupling, a ball screw nut is sleeved on the ball screw, a ball screw nut seat is sleeved outside the ball screw nut, and the ball screw nut seat is fixed on the inner wall of the lifting column.
Further, the sliding guide sleeve is a brass sliding guide sleeve, a nylon guide sleeve, a POM guide sleeve or a polytetrafluoroethylene guide sleeve.
Further, a balancing weight is further arranged below the base of the lifting adjusting device.
Further, the balancing weight is a metal balancing weight.
In another aspect, the invention further provides an image-guided radiotherapy apparatus, which comprises a contrast imaging apparatus, an accelerator head, a control processing module, and the accelerator head lifting adjusting device, wherein the accelerator head lifting adjusting device can drive the accelerator head and the contrast imaging apparatus to synchronously rotate around a rotation axis of the contrast imaging apparatus.
In addition, the invention also provides a control method of the image-guided radiotherapy equipment, which comprises the following steps,
The contrast imaging equipment acquires the position information of a scanning center point;
transmitting the vertical distance D to a control processing module to calculate and obtain the vertical distance D between the head of the accelerator and the scanning center point;
The control processing module acquires the deflection angle of the accelerator head around the rotating shaft of the contrast imaging device in real time, calculates and obtains the deflection angle of the accelerator head around the deflection shaft of the head and the height of the corresponding lifting rod under the condition that the vertical distance D from the accelerator head to the scanning center is unchanged, and feeds back the deflection angle to the head driving positioning device and the lifting rod; the machine head deflection driving positioning device drives the accelerator machine head to deflect a certain angle around the machine head deflection rotating shaft according to the feedback data, and the lifting rod is also adjusted to a certain height according to the feedback data.
The liftable adjusting device of the accelerator machine head solves the problem that the irradiation intensity received by each part of a scanned object is inconsistent due to different scanning center points caused by the limitation of the equipment structure by arranging the liftable upright post and combining the traditional machine head deflection driving positioning device. The image-guided radiotherapy equipment and the control method are convenient to operate, ensure that the vertical distance from the accelerator head to the scanning center point is consistent, and avoid the problem that the irradiation intensity received everywhere is inconsistent.
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 diagram of a lifting adjusting device for an accelerator head according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a structure of a lifting rod of a screw rod according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an image-guided radiotherapy apparatus with an accelerator head liftable adjustment device according to an embodiment of the present invention;
FIG. 4A is a schematic diagram of a control method of an image-guided radiotherapy apparatus having an accelerator adjustment device according to an embodiment of the present invention;
FIG. 4B is a schematic diagram II of an image-guided radiotherapy apparatus control method with an accelerator adjustment device according to an embodiment of the present invention;
Fig. 5 is a schematic diagram II of a radiotherapy apparatus guided by an image apparatus with an accelerator head lifting adjusting device according to an embodiment of the present invention.
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. 1-2, an accelerator handpiece liftable adjustment device for an image-guided radiotherapy apparatus is provided in an embodiment of the present invention; the device includes base 7, and the fixed surface is connected with stand 2 on the both ends of base 7, stand 2 height-adjustable, stand upper end fixedly connected with aircraft nose bears frame 3.
The machine head bearing frame 3 is provided with an accelerator machine head 1 and a machine head deflection driving positioning device 9, and an emission source and a multi-leaf collimator (MLC) are arranged in the accelerator machine head 1 and are used for emitting rays; the head deflection driving positioning device 9 is positioned at the periphery of the accelerator head 1, can drive the accelerator head 1 to perform a certain angle of rotation deflection movement around the accelerator head deflection rotary shaft 15, and can measure and feed back the deflection position.
The upright post 2 comprises a lifting rod 5 and a bracket 6, one end of the lifting rod 5 is connected to the lower surface of the machine head bearing frame 3, and the other end is connected to the bracket 6. Since the lifting rod 5 is liftable, the entire column height is also adjustable. For stability, the lifting rods 5 are four, and are respectively connected to two ends of the machine head bearing frame 3 in pairs.
The lifting rod 5 may be a screw lifting rod or a rail lifting rod, etc., preferably a screw lifting rod, and fig. 2 shows a specific embodiment of a screw lifting rod, including: the lifting column 512 is sleeved in the lifting seat 511 through a sliding guide sleeve 513, a motor 515 is fixed at the bottom of the lifting seat 511, the motor 515 is fixed at the bottom of the lifting seat 511 through a motor seat 519, a ball screw 516 is connected to the motor 515 through an elastic coupler 514, a ball screw nut 518 is sleeved on the ball screw 516, a ball screw nut seat 517 is sleeved outside the ball screw nut 518, and the ball screw nut seat 517 is fixed on the inner wall of the lifting column 512. In this way, the motor 515 drives the ball screw nut 518 to move up and down through the ball screw 516, and the ball screw nut seat 517 plays a limiting role, so that the lifting column 512 can be driven to move up and down when the ball screw nut 518 moves up and down.
The sliding guide sleeve 513 can reduce the gap between the lifting column 512 and the lifting seat 511 and the friction force during the up-and-down movement, and reduce the power of the driving motor. The sliding guide sleeve 513 may be made of a sliding guide material such as brass, nylon, POM, or polytetrafluoroethylene.
Further, in order to keep balance, the operation is more stable, and a balancing weight 4 is further arranged below the base 7 of the lifting adjusting device. Preferably the weight 4 is a metal weight and may also assist in absorbing excess radiation from the accelerator head 1.
An image-guided radiotherapy apparatus having an accelerator head liftable adjusting device and a control method thereof according to an embodiment of the present invention will be described below with reference to fig. 3 to 4.
As shown in fig. 3, an image-guided radiotherapy apparatus has an accelerator head liftable adjusting device as shown in fig. 1, a contrast imaging apparatus 10, an accelerator head 1, and a control processing module. The radiography imaging device 10 is used for scanning and imaging tumor of a patient, accurate radiotherapy is carried out on the tumor through an image-guided radiotherapy device, the radiography imaging device 10 comprises nuclear magnetism MRI, CT, DR and the like, the whole set of radiotherapy device is fixed and supported through a radiography device support 11, the radiography device support 11 is installed on the radiography imaging device 10 through a radiography device slewing bearing 12, therefore, the radiography imaging device can do slewing motion around a radiography device slewing axis 13, the accelerator head 1 is fixed on an accelerator head lifting adjusting device, the accelerator head lifting adjusting device is installed and fixed on two sides of the radiography imaging device 10 in a crossing mode through a stand column 2, and the accelerator head 1 and the radiography imaging device 10 are driven to rotate around the radiography imaging device slewing axis 13 synchronously.
Referring to fig. 4A, the ideal irradiation mode of the accelerator handpiece 1 is to position the scan center point 18 on the system center point 17 by moving the treatment couch (i.e., the system center point 17 coincides with the rotation axis 13 of the contrast apparatus), and the rotation of the accelerator handpiece 1 around the system center point 17 can realize the isocentric rotation of the scan center point 18. In this case, since the scan center point 18 is located at the rotation center of the radiation source, the distance from the accelerator head 1 to the scan center point 18 is a fixed value at each point during the rotation of the accelerator head 1 about the rotation axis 13 of the contrast apparatus, and the intensity at the scan center point 18 does not change due to the distance or the like.
However, in practical applications, due to different types, structures and imaging principles of the contrast apparatus, the moving distance of the patient bed is limited, and the patient bed cannot be randomly positioned, so that the position of the scan center point 18 may deviate from the system center point 17, as shown in fig. 4A, in this case, if the accelerator head 1 continues to rotate around the rotation axis 13 of the contrast apparatus in the original manner, a situation such as that the beam cannot irradiate the scan center point 18 may occur. For irradiation to the scan center point 18, the existing apparatus can irradiate the beam of rays only by deflecting the accelerator head 1 by an angle α about the head yaw pivot axis 15 to aim the beam of rays at the scan center point 18. In this way, however, the distance from the accelerator head 1 to the scan center point 18 is necessarily different from location to location in the path of the accelerator rotation about the system center point 17, which results in a change in the energy of the radiation reaching the scan center point 18.
The radiotherapy equipment of the embodiment of the invention is provided with the liftable adjusting device, the upright post 2 of the radiotherapy equipment is liftable, the position of the accelerator head 1 can be adjusted up and down through the telescopic lifting rod 5, and meanwhile, the adjustment range can be enlarged by combining the deflection of the accelerator head 1 around the deflection rotating shaft 15 of the accelerator head, so that the vertical distance from the accelerator head 1 to the scanning center point 18 is unchanged in the rotating process, and the irradiation intensity to the scanning center point 18 is unchanged in the rotating process of the accelerator head 1 along with the radiography imaging equipment 10 around the rotating shaft 13.
Specifically, when the scan center point 18 of the patient 16 cannot be placed on the system center point 17, the control method of the radiotherapy apparatus according to the embodiment of the present invention is as follows:
1) The contrast imaging device 10 acquires position information of the scanning center point 18;
2) The vertical distance D from the accelerator handpiece 1 to the scanning center point 18 is obtained through calculation by the control processing module;
3) The control processing module acquires the deflection angle of the accelerator head 1 around the rotary shaft 13 of the contrast imaging device in real time, calculates and obtains the deflection angle of the accelerator head 1 around the head deflection shaft 15 and the height of the corresponding lifting rod 5 under the condition that the vertical distance D from the accelerator head 1 to the scanning center point 18 is unchanged, and feeds back to the head deflection driving positioning device 9 and the lifting rod 5; further, the head yaw drive positioning device 9 drives the accelerator head 1 to yaw a certain angle around the head yaw pivot shaft 15 based on the feedback data, and the lifter 5 is also adjusted to a certain height based on the feedback data.
In a specific embodiment, referring to fig. 4A and 4B, firstly, a scanning object is scanned and imaged by the imaging device 10 to obtain position information of a scanning center point 18, then, as shown in fig. 4A, when the accelerator head 1 does not deflect around a rotating shaft of the imaging device, that is, when the deflection angle is 0 °, the vertical distance D from the accelerator head to the scanning center is ensured to be unchanged, the control processing module calculates that the deflection angle of the accelerator head 1 around the head deflection shaft 15 and the height a of the corresponding lifting rod are alpha, and then the angle a is fed back to the head deflection driving positioning device 9 and the lifting rod 5, and further, the head deflection driving positioning device 9 drives the accelerator head 1 to deflect by an angle alpha around the head deflection rotating shaft 15 according to feedback data, and the lifting rod 5 is also adjusted to be a height a, so that the vertical distance D from the accelerator head to the scanning center is realized.
When the control processing module obtains that the rotation angle of the accelerator head 1 along with the contrast imaging device 10 around the rotating shaft 13 of the contrast device is theta, the vertical distance D from the accelerator head to the scanning center is unchanged, the deflection angle of the accelerator head 1 around the head deflection shaft 15 is beta, the height of the corresponding lifting rod is B, and then the angle is fed back to the head deflection driving positioning device 9 and the lifting rod 5, and further the head deflection driving positioning device 9 drives the accelerator head 1 to deflect beta around the head deflection rotating shaft 15 according to feedback data, and the lifting rod 5 is also adjusted to be B, so that the vertical distance from the accelerator head to the scanning center is D.
Thus, as described above, when the accelerator head 1 continuously rotates around the equipment isocenter 17, the head yaw driving positioning device 9 drives the accelerator head 1 to yaw according to the real-time position, and adjusts the yaw angle, and at the same time, the lifting rod 5 adjusts the height of the upright post 2, specifically, the distance between the head carrier 3 and the bracket 6, by self-expansion and contraction, so as to ensure that the vertical distance from the accelerator head 1 to the scanning center is constant.
The liftable adjusting device of the accelerator head of the embodiment of the invention can be integrated with the contrast imaging equipment 10 as shown in fig. 3, so that the adjusting device and the contrast imaging equipment 10 rotate simultaneously; in addition, the connector 29 may be mounted outside the contrast imaging apparatus 10, and may be rotated independently or simultaneously with the contrast imaging apparatus 10, as shown in fig. 5.
In summary, the liftable adjusting device for the accelerator head provided by the embodiment of the invention solves the problem of inconsistent irradiation intensity received by each part of a scanned object caused by different scanning center points due to equipment structure limitation by arranging the liftable upright post and combining the head deflection driving positioning device. The image-guided radiotherapy equipment and the control method are convenient to operate, ensure that the vertical distance from the accelerator head to the scanning center point is consistent, and avoid the problem that the irradiation intensity received everywhere is inconsistent.
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 (8)
1. The image-guided radiotherapy equipment comprises contrast imaging equipment, an accelerator head and a control processing module, and is characterized by further comprising an accelerator head lifting adjusting device, wherein the accelerator head lifting adjusting device can drive the accelerator head and the contrast imaging equipment to synchronously rotate around a rotating shaft of the contrast imaging equipment;
The accelerator aircraft nose liftable adjusting device includes: the machine head supporting frame is fixedly connected with the upper end of the upright post;
The stand column comprises a lifting rod and a bracket, one end of the lifting rod is connected to the lower surface of the machine head bearing frame, and the other end of the lifting rod is connected to the bracket;
The machine head supporting frame is provided with an accelerator machine head and a machine head deflection driving positioning device, and the machine head deflection driving positioning device can drive the accelerator machine head to do rotary deflection movement around a machine head deflection rotary shaft and can measure and feed back deflection positions;
The control of the image-guided radiotherapy apparatus is as follows: the contrast imaging equipment acquires the position information of a scanning center point; transmitting the vertical distance D to a control processing module to calculate and obtain the vertical distance D between the head of the accelerator and the scanning center point; the control processing module acquires the deflection angle of the accelerator head around the rotating shaft of the contrast imaging device in real time, calculates and obtains the deflection angle of the accelerator head around the rotating shaft of the head deflection and the height of the corresponding lifting rod under the condition that the vertical distance D from the accelerator head to the scanning center is unchanged, and feeds back the deflection angle to the head deflection driving positioning device and the lifting rod; the machine head deflection driving positioning device drives the accelerator machine head to deflect a certain angle around the machine head deflection rotating shaft according to the feedback data, and the lifting rod is also adjusted to a certain height according to the feedback data.
2. The image-guided radiotherapy apparatus of claim 1, wherein: the lifting rods are four, and are respectively connected to the two ends of the machine head bearing frame in a pairwise manner.
3. The image-guided radiotherapy apparatus of claim 1, wherein: the lifting rod is a guide rail type lifting rod or a screw lifting rod.
4. The image-guided radiotherapy apparatus of claim 3, wherein: the lifting rod is a screw rod lifting rod.
5. The image-guided radiotherapy apparatus of claim 4, wherein: the lifter includes: the lifting column is sleeved in the lifting seat through a sliding guide sleeve, a motor is fixed at the bottom of the lifting seat, the motor is connected with a ball screw through a coupling, a ball screw nut is sleeved on the ball screw, a ball screw nut seat is sleeved outside the ball screw nut, and the ball screw nut seat is fixed on the inner wall of the lifting column.
6. The image-guided radiotherapy apparatus of claim 5, wherein: the sliding guide sleeve is a brass sliding guide sleeve, a nylon sliding guide sleeve, a POM sliding guide sleeve or a polytetrafluoroethylene sliding guide sleeve.
7. The image-guided radiotherapy apparatus of claim 1, wherein: and a balancing weight is further arranged below the base of the lifting adjusting device.
8. The image-guided radiotherapy apparatus of claim 7, wherein: the balancing weight is a metal balancing weight.
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| CN201811654694.5A CN109646820B (en) | 2018-12-29 | 2018-12-29 | Accelerator head liftable adjusting device, radiotherapy equipment and control method |
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| CN201811654694.5A CN109646820B (en) | 2018-12-29 | 2018-12-29 | Accelerator head liftable adjusting device, radiotherapy equipment and control method |
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| CN103517737A (en) * | 2011-01-20 | 2014-01-15 | 爱可瑞公司 | Radiation Therapy Delivery System with Ring Gantry |
| CN205759156U (en) * | 2016-05-31 | 2016-12-07 | 林玲玲 | A kind of radiation locating support |
| CN209645671U (en) * | 2018-12-29 | 2019-11-19 | 佛山瑞加图医疗科技有限公司 | Accelerator head liftable regulating device and radiotherapy apparatus |
| CN209662466U (en) * | 2018-12-29 | 2019-11-22 | 佛山瑞加图医疗科技有限公司 | A kind of accelerator adjustment device |
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