CN209630462U - The magnetic field compensation system of the radiotherapy system of guided by magnetic resonance - Google Patents
The magnetic field compensation system of the radiotherapy system of guided by magnetic resonance Download PDFInfo
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- CN209630462U CN209630462U CN201822259472.5U CN201822259472U CN209630462U CN 209630462 U CN209630462 U CN 209630462U CN 201822259472 U CN201822259472 U CN 201822259472U CN 209630462 U CN209630462 U CN 209630462U
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- magnetic resonance
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Abstract
The utility model discloses a kind of magnetic field compensation systems of the radiotherapy system of guided by magnetic resonance, radiotherapy system includes MR imaging apparatus and radiotheraphy device, MR imaging apparatus includes main magnet, radiotheraphy device includes radiation head, radiation head is internally provided with grating blade and drives the motor of grating blade, the magnetic field compensation system includes compensation control device, compensation permanent magnet, and the magnetic field strength test device and position sensor being connected with motor, compensation control device are used to control the movement of compensation permanent magnet.The utility model can dynamically adjust the intensity in compensation magnetic field, so that effective operation of motor be effectively ensured.
Description
Technical field
The utility model relates to radiotherapy equipment technical fields, and in particular to a kind of radiotherapy system of guided by magnetic resonance
Magnetic field compensation system.
Background technique
The radiotherapy system of guided by magnetic resonance obtains the accurate position of patient tumors in radiotherapy by real-time magnetic resonance image
It sets, does not then influence tumor vicinity healthy cell again using the radiation that the radiation head of radiotheraphy device carries out effective dose to tumour,
And then realize more accurate radiotherapy.
But in the radiotherapy apparatus of guided by magnetic resonance, due to the influence of the high-intensity magnetic field of magnetic resonance, make radiation head at one
It works in magnetic field environment, causes the torque for the motor for driving grating blade to become smaller, influence the driving of the grating blade in radiation head,
It cannot even drive grating blade to move, lead to radiation head failure.The prior art is that a magnet is directly fixed on radiation head, with
It generates opposing magnetic field and reduces the magnetic field strength of motor present position, and then the torque for reducing motor declines degree.But this side
Formula has following defects that the motor when radiation head is moved relative to the magnetic field of magnetic resonance, in radiation head in magnetic resonance institute
Position in the magnetic field of generation be it is changed, the magnetic field strength of motor present position can also change, the torque of motor
Also can change therewith, and the above method generate opposing magnetic field magnetic field strength be it is fixed, be not easy to according to motor position tune
Whole magnetic field strength causes failure so that the torque for also resulting in motor is insufficient；In addition when the magnetic field that magnetic resonance itself generates occurs
When variation, the above method also cannot achieve the adjustment of opposing magnetic field intensity, to can not effectively eliminate or reduce magnetic field to motor
The influence of operation.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of field compensation systems of the radiotherapy system of guided by magnetic resonance
System can dynamically adjust the intensity in compensation magnetic field, so that effective operation of motor be effectively ensured.
In order to solve the above-mentioned technical problem, the technical scheme that the utility model is provided is as follows:
A kind of magnetic field compensation system of the radiotherapy system of guided by magnetic resonance, the radiotherapy system includes MR imaging apparatus
And radiotheraphy device, the MR imaging apparatus include main magnet, the radiotheraphy device includes radiation head, inside the radiation head
It is provided with grating blade and drives the motor of the grating blade, which includes compensation control device, compensates forever
Magnet, and the magnetic field strength test device and position sensor that are connected with motor, the compensation control device is for controlling
The movement of system compensation permanent magnet.
The MR imaging apparatus further includes base, and the main magnet has been rotatably coupled on the base, described
Radiotheraphy device further includes bracket, and the radiation head is fixed on the bracket, and the bracket is pivotably connected in the main magnetic
On body.
The swing angle of the relatively described main magnet of the bracket is -20 °~20 °.
The bracket and the main magnet are hinged.
The encoder for detecting the bracket displacement is connected on the bracket.
Magnetic shield is connected on the position sensor.
The magnetic shield is in sphere shape.
The radiation head is in cone.
The magnet bore for accommodating patient is provided in the main magnet.
The isocenter point of the radiotheraphy device is located on the axis of the magnet bore.
The utility model has the following beneficial effects: the field compensation of the radiotherapy system of the guided by magnetic resonance of the utility model
System can compensate intensity and the direction in magnetic field to adjust according to magnetic field at motor and motor position, motion compensation permanent magnet, from
And effectively realize the dynamic adjustment in compensation magnetic field, the influence for effectively eliminating or reducing main field to motor operation guarantees motor
Effectively operation；Compensation effect and better reliability；Convenient for operation, regulated efficiency and adjustment reliability are higher.
Detailed description of the invention
Fig. 1 is the schematic illustration of the utility model compensation device；
Fig. 2 is the structural schematic diagram of the radiotherapy system of the utility model；
Fig. 3 is the side structure schematic view of Fig. 2；
In figure: 1, main magnet, 2, bracket, 3, radiation head.
Specific embodiment
The utility model is described in further detail in the following with reference to the drawings and specific embodiments, so that those skilled in the art
The utility model may be better understood and can be practiced, but illustrated embodiment is not as the restriction to the utility model.
As shown in Figure 1, Figure 2 and Figure 3, present embodiment discloses a kind of magnetic field of radiotherapy system for guided by magnetic resonance benefits
System is repaid, radiotherapy system includes MR imaging apparatus and radiotheraphy device, and MR imaging apparatus includes main magnet 1, radiotherapy dress
It sets including radiation head 3, the motor for being internally provided with grating blade and driving grating blade of radiation head 3；
Wherein, MR imaging apparatus is for acquiring magnetic resonance image to obtain the exact position of patient tumors in radiotherapy；
Radiotheraphy device is used to carry out tumour radiotherapy, and radiation head 3 is used to issue the radiographic source of radiation, to fill for magnetic resonance imaging
Set the position progress radiotherapy for obtaining tumour；Motor driven grating blade is moved to change the beam of the injection of radiation head 3
Shape and size, to adapt to shape, the size and location of tumour.
Above-mentioned magnetic field compensation system includes compensation control device, compensation permanent magnet, and the magnetic field being connected with motor
Strength testing device and position sensor；Magnetic field strength test device is for detecting motor in the magnetic field caused by main magnet 1
Magnetic induction intensity；Position sensor is used to detect the position of motor；Compensation control device is used to control the shifting of compensation permanent magnet
Dynamic, by control compensation permanent magnet with respect to motor position, adjustable motor is in the magnetic field caused by compensation permanent magnet
The size of magnetic induction intensity.
Further, further, magnetic field strength test device uses Tesla meter.
In a wherein embodiment, MR imaging apparatus further includes base, has been rotatably coupled master on base
Magnet 1 namely main magnet 1 itself can rotate with respect to base；As shown in Fig. 2-Fig. 3, radiotheraphy device further includes bracket 2, branch
Radiation head 3 is fixed on frame 2, bracket 2 is pivotably connected in main magnet 1.Radiation head 3 is driven by the swing of frame 2
It swings, the adjusting range in the beam direction of the injection of radiation head 3 can be increased, so as to irradiate tumour from more directions,
The setting structure is simple, is convenient for operation, can also save space.In addition when radiation head 3 is swung with respect to main field 1, motor position
Also it can change correspondingly, therefore cooperate with above-mentioned compensation control device, can preferably eliminate magnetic field produced by main magnet 1 to motor
Influence, guarantee the normal operation of motor.
By the rotation of main magnet 1 and the swing of bracket 2 so that radiation head 3 is moved with following two, one is with
The rotation of main magnet 1, one is the swings of opposite main magnet 1, thus the adjustment of more conducively angle of radiation.
Further, bracket 2 is -20 °~20 ° with respect to the swing angle of main magnet 1, is more conducively had to tumor locus
Effect irradiation, guarantees the intensity and effective dose of irradiation.
In a wherein embodiment, bracket 2 and main magnet 1 are hinged or bracket 2 and main magnet 1 pass through bearing
It is connected, the swing of radiation head 3 is better achieved.
In a wherein embodiment, magnetic shield is connected on position sensor, with prevent position sensor by
Magnetic disturbance.
Further, magnetic shield is in sphere shape, more preferably to play the effect of magnetic protection.
In a wherein embodiment, radiation head 3 with the installation for grating blade of being more convenient for, and is convenient in cone
The installation of radiation head 3 and bracket 2.Radiation head 3 is not limited to above-mentioned shape, and circle or other shapes can also be used.
In a wherein embodiment, the encoder of the displacement for detection support 2 is connected on bracket 2, with more preferable
Ground determines the position of radiation head 3, it is ensured that the radial location of beam.
Wherein, the magnet bore of main magnet 1 being internally provided with for accommodating patient.
Further, the isocenter point of radiotheraphy device is located on the axis of magnet bore.
According to the definition of international standard IEC isocenter (ISOCENTRE): in radiology device, the base of various movements
Fiducial axis line is around the movement of common center point, and radial axis is passed through in this smallest sphere centered on putting, this point is equal centers
Point.As long as namely the tumor center of patient is placed on isocenter point, no matter what angle rack, radiation head and therapeutic bed are in
Degree, or make any rotation, radiation center is overlapped with tumor center always.
The present embodiment also discloses a kind of field compensation method of radiotherapy system for guided by magnetic resonance, defines main magnet
It is main field that 1 magnetic field generated, which is magnetic field caused by main field namely MR imaging apparatus, the magnetic that compensation permanent magnet generates
For compensation magnetic field, above-mentioned field compensation method the following steps are included:
1) motor position is detected using position sensor, and detect motor in master using magnetic field strength test device
Magnetic induction intensity in magnetic field；
2) it is pre- with respect to motor to calculate compensation permanent magnet for the magnetic induction intensity and motor position according to motor in main field
If distance, so that magnetic induction of the motor in compensation magnetic field is strong between compensation permanent magnet and motor after above-mentioned pre-determined distance
It spends identical with magnetic induction intensity of the motor in main field；
And magnetic induction intensity direction of the motor in main field is determined according to the Distribution of Magnetic Field of motor position and main field；
It should be understood that due to the Distribution of Magnetic Field situation of main field be it is determining, can determine that motor exists according to the distribution situation
Magnetic induction intensity direction in main field；
3) it is moved to motor using compensation control device control compensation permanent magnet at a distance of the position of above-mentioned pre-determined distance, and
So that magnetic induction intensity of magnetic induction intensity direction and motor of the motor in compensation magnetic field in main field is contrary, such as
The direction in compensation magnetic field can be changed by adjusting the direction of permanent magnet, so that magnetic induction of the motor in compensation magnetic field is strong
It is contrary to spend the magnetic induction intensity of direction and motor in main field.
Influence of the main field to motor can be offset in real time by the above process, the normal operation of motor is effectively ensured.
The magnetic field compensation apparatus and method of the radiotherapy system of the guided by magnetic resonance of the present embodiment, can effectively realize at motor
The real-time measurement in magnetic field and motor position, and the intensity for compensating magnetic field is adjusted according to the real-time motion compensation permanent magnet of measurement result
And direction, to effectively realize the dynamic adjustment in compensation magnetic field, the influence for effectively eliminating or reducing main field to motor operation is protected
Demonstrate,prove effective operation of motor；It is relatively stable to compensate the compensation magnetic field that permanent magnet generates, benefit is adjusted by motion compensation permanent magnet
Repay the intensity in magnetic field, compensation effect and better reliability；The compensation device convenient for operation, regulated efficiency and adjustment reliability compared with
It is high.
Embodiment described above is only preferred embodiments for fully illustrating the utility model, the utility model
Protection scope it is without being limited thereto.Those skilled in the art made equivalent substitute or change on the basis of the utility model
It changes, both is within the protection scope of the present invention.The protection scope of the utility model is subject to claims.
Claims (10)
1. a kind of magnetic field compensation system of the radiotherapy system of guided by magnetic resonance, the radiotherapy system include MR imaging apparatus and
Radiotheraphy device, the MR imaging apparatus include main magnet, and the radiotheraphy device includes radiation head, are set inside the radiation head
Be equipped with grating blade and drive the motor of the grating blade, characterized in that the magnetic field compensation system include compensation control device,
Permanent magnet is compensated, and the magnetic field strength test device and position sensor that are connected with motor, the compensation control device
For controlling the movement of compensation permanent magnet.
2. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as described in claim 1, characterized in that the magnetic resonance
Imaging device further includes base, and the main magnet has been rotatably coupled on the base, and the radiotheraphy device further includes bracket,
The radiation head is fixed on the bracket, the bracket is pivotably connected in the main magnet.
3. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as claimed in claim 2, characterized in that the bracket phase
Swing angle to the main magnet is -20 °~20 °.
4. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as claimed in claim 2, characterized in that the bracket and
The main magnet is hinged.
5. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as claimed in claim 2, characterized in that on the bracket
It is connected with the encoder for detecting the bracket displacement.
6. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as described in claim 1, characterized in that the position passes
Magnetic shield is connected on sensor.
7. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as claimed in claim 6, characterized in that the magnetic protection
Cover is in sphere shape.
8. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as described in claim 1, characterized in that the radiation head
In cone.
9. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as described in claim 1, characterized in that the main magnet
Inside it is provided with the magnet bore for accommodating patient.
10. the magnetic field compensation system of the radiotherapy system of guided by magnetic resonance as claimed in claim 9, characterized in that the radiotherapy
The isocenter point of device is located on the axis of the magnet bore.
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| CN201822259472.5U CN209630462U (en) | 2018-12-29 | 2018-12-29 | The magnetic field compensation system of the radiotherapy system of guided by magnetic resonance |
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| CN201822259472.5U CN209630462U (en) | 2018-12-29 | 2018-12-29 | The magnetic field compensation system of the radiotherapy system of guided by magnetic resonance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847196A (en) * | 2018-12-29 | 2019-06-07 | 佛山瑞加图医疗科技有限公司 | The magnetic field compensation system and method for the radiotherapy system of guided by magnetic resonance |
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2018
- 2018-12-29 CN CN201822259472.5U patent/CN209630462U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847196A (en) * | 2018-12-29 | 2019-06-07 | 佛山瑞加图医疗科技有限公司 | The magnetic field compensation system and method for the radiotherapy system of guided by magnetic resonance |
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