CN109954228A - A kind of medical accelerator electronic portal imaging device EPID positioning device - Google Patents
A kind of medical accelerator electronic portal imaging device EPID positioning device Download PDFInfo
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- CN109954228A CN109954228A CN201811591379.2A CN201811591379A CN109954228A CN 109954228 A CN109954228 A CN 109954228A CN 201811591379 A CN201811591379 A CN 201811591379A CN 109954228 A CN109954228 A CN 109954228A
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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
- A61N5/103—Treatment planning 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
- A61N5/1048—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
- A61N5/1048—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
- A61N2005/1054—Monitoring, verifying, controlling systems and methods for verifying the position of the patient with respect to the radiation beam using a portal imaging system
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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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- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a kind of medical accelerator electronic portal imaging device EPID positioning devices, belong to radiotherapy instrument technical field.Turnover mechanism installation in device is on the base, turnover mechanism realizes the rotation around mounting axis, the turning positioning mechanical being mounted on turning positioning mechanical carries out mechanical position limitation to the flip angle of turnover mechanism, and the rotational positioning anti-backlash mechanism being mounted on turnover mechanism eliminates the transmission sideshake of turnover mechanism；Straight-line motion mechanism is mounted on turnover mechanism, ray detecting device is mounted on straight-line motion mechanism, the linear positioning mechanisms being mounted on turnover mechanism carry out mechanical position limitation to the linear motion of straight-line motion mechanism, and the straight line positioning anti-backlash mechanism in straight-line motion mechanism eliminates the transmission sideshake of linear transmission mechanism.The present invention is capable of the position of resetting ray detecting device quick by turnover mechanism and straight-line motion mechanism, reliable.
Description
Technical field
The invention belongs to radiotherapy instrument technical fields, and in particular to a kind of medical accelerator electronics portal imaging system
System positioning device.
Background technique
Using accelerator to tumor patient carry out precise radiotherapy during, it is desirable that the practical irradiation field of real-time verification with
Plan the consistency of irradiation field, the positioning accuracy and repetitive positioning accuracy of ray detecting device are that irradiation field real-time verification is accurate
Guarantee.Complexity is assembled by existing frequently-used link rod turnover mechanism, and occupied space is big, is unfavorable for modularized production, positioning accuracy and tune
Examination peopleware is related, and the quality stability of batch production is difficult to control.
Summary of the invention
In view of this, the present invention provides a kind of medical accelerator electronic portal imaging device EPID positioning device, Neng Goutong
Cross the position of turnover mechanism and quick, the reliable resetting ray detecting device of straight-line motion mechanism.
A kind of medical accelerator electronic portal imaging device EPID positioning device, the positioning device include pedestal, turnover mechanism,
Rotational positioning anti-backlash mechanism, turning positioning mechanical, straight-line motion mechanism, straight line position anti-backlash mechanism, linear positioning mechanisms and penetrate
Line detection device；
On the base, turnover mechanism realizes the rotation around mounting axis for the turnover mechanism installation, is mounted on overturning positioning
Turning positioning mechanical in mechanism carries out mechanical position limitation to the flip angle of turnover mechanism, and the rotation being mounted on turnover mechanism is fixed
Position anti-backlash mechanism eliminates the transmission sideshake of turnover mechanism；The straight-line motion mechanism is mounted on turnover mechanism, ray
Detection device is mounted on straight-line motion mechanism, is mounted on the linear positioning mechanisms on turnover mechanism to the straight of straight-line motion mechanism
Line movement carries out mechanical position limitation, the straight line positioning anti-backlash mechanism in straight-line motion mechanism to the transmission sideshake of linear transmission mechanism into
Row is eliminated.
Further, the turning positioning mechanical includes overturning locating piece and adjusts screw, and linear positioning mechanisms include straight
Line locating piece and adjusting screw；The position that adjusting screw on the overturning locating piece and rectilinear key limits needed for being used to finely tune
It sets.
Further, the pedestal includes mounting base, main support column, aiding support column and bearing block；Main support column and
Aiding support column is vertically fixed on mounting base, and bearing block is mounted on aiding support column.
Further, the turnover mechanism includes that rotary decelerator, overturning driving decelerating motor, rotational positioning disappear gap machine
Structure, shaft, linear motion support and angular samples device；
The rotary reducer is fixedly connected with main support column, overturning driving decelerating motor and the fixed company of rotary decelerator
It connects, rotary decelerator is fixedly connected with rotational positioning anti-backlash mechanism, and rotational positioning anti-backlash mechanism is fixed with linear motion support
Connection, linear motion support are mounted on bearing block by shaft, and shaft is fixedly connected with angular samples device, and overturning driving is slowed down
When motor works, linear motion support makees flip-flop movement, and angular samples device carries out the angle position sampling of linear motion support.
Further, the rotational positioning anti-backlash mechanism includes rotating the gap support that disappears, rotating the gap output shaft that disappears, rotate the gap that disappears
Spring, big stop collar, small stop collar and holding screw；
The gap output shaft that disappears that rotates is concentrically mounted in the center mounting hole for rotating the gap support that disappears, and rotation anti-backlash is in
It is radial at the same be embedded in rotation disappear gap support and rotation disappear gap output shaft mounting groove in so that rotation disappears gap support and rotation disappears
Has the ability of relative resilient rotation between gap output shaft, big stop collar and small stop collar, which are respectively embedded into rotation and disappear, gap support and to be turned
It is fixed in the dynamic gap output shaft that disappears and by holding screw, plays the position-limiting action to rotation anti-backlash.
Further, the straight-line motion mechanism include linear mould group, linear drives decelerating motor, optoelectronic switch assembly and
Pinboard；
Linear drives decelerating motor is fixedly connected with linear mould group, and the linear slide block and straight line of linear mould group position the gap machine that disappears
Structure is fixedly connected, and straight line positioning anti-backlash mechanism is fixedly connected with pinboard, when linear drives decelerating motor works, linear mould group
Linear slide block makees straight reciprocating motion, and the linear slide block of linear mould group drives ray detecting device to stretch out or contract by pinboard
It returns, optoelectronic switch assembly determines the flexible extreme position of ray detecting device, and optoelectronic switch assembly is fixedly connected with linear mould group
And position is adjustable.
Further, straight line positioning anti-backlash mechanism includes that disappear gap support, straight line of straight line disappears gap piston and compressed spring,
Straight line disappears gap piston and compressed spring be located at straight line disappear gap support mounting groove in, compressed spring is in pre-compressed state, straight line
The gap that disappears piston can move under external force along compressed spring axis direction；
The disappear upper and lower ends of gap support of straight line are fixedly connected with pinboard and linear mould group sliding block respectively, when linear motion machine
When structure runs to ray detecting device and is in designated position, rectilinear key and straight line, which disappear, gap piston contact and compresses compression bullet
Spring, limitation pinboard continue to move, and the opposite force that compressed spring generates passes to linear mould group by the straight line gap support that disappears, so that
Linear transmission pair is in close contact, and eliminates the transmission sideshake of linear transmission mechanism, guarantees that ray detecting device repeatedly moves back and forth
Fixed position is returned to afterwards.
The utility model has the advantages that
(1) present invention using rotational positioning anti-backlash mechanism and overturning locating piece guarantee corner positioning it is reliable, without return difference, can
Ensure to turn to same position every time.
(2) present invention guarantees that ray detecting device positions reliable, nothing using straight line positioning anti-backlash mechanism and rectilinear key
Return difference, it can be ensured that each straight-line displacement to same position.
(3) present invention employs anti-collision mechanisms and protective cover to prevent ray detecting device by external force collision.
(4) present invention employs decelerating motors, simplify the whole drive mechanism of device.
Detailed description of the invention
Fig. 1 is the ray detecting device initial position schematic diagram of structure of the invention；
Fig. 2 is that the ray detecting device of structure of the invention positions schematic diagram；
Fig. 3 is the structural schematic diagram of rotational positioning anti-backlash mechanism of the present invention；
Fig. 4 is the structural schematic diagram that straight line of the present invention positions anti-backlash mechanism.
Wherein, 1- mounting base, the main support column of 2-, 3- aiding support column, 4- rotary decelerator, 5- overturning driving are slowed down
Motor, 6- bearing block, 7- shaft, 8- linear motion support, the linear mould group of 9-, 10- linear drives decelerating motor, 11- limited block,
12- pinboard, 13- protective cover, 14- ray detecting device, 15- anti-collision mechanism, 16- angular samples device, 17- optoelectronic switch group
Part, 18- rotational positioning anti-backlash mechanism, 18-1- rotate the gap support that disappears, and 18-2- rotates the gap output shaft that disappears, and 18-3- rotates the gap bullet that disappears
Spring, the big stop collar of 18-4-, the small stop collar of 18-5-, 18-6- holding screw, 19- straight line position anti-backlash mechanism, and 19-1- straight line disappears
Gap support, 19-2- straight line disappear gap piston, 19-3- compressed spring, and 20- overturns locating piece, and 21- adjusts screw, the positioning of 22- straight line
Block, 23- adjust screw.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
As shown in figure 1 and 2, the present invention provides a kind of medical accelerator electronic portal imaging device EPID positioning device,
Positioning device includes turnover mechanism, straight-line motion mechanism, pedestal, turning positioning mechanical, linear positioning mechanisms, anti-collision mechanism and penetrates
Line detection device；
The pedestal includes mounting base 1, main support column 2, aiding support column 3 and bearing block 6；
The turnover mechanism includes rotary decelerator 4, overturning driving decelerating motor 5, rotational positioning anti-backlash mechanism 18, turns
Axis 7, linear motion support 8 and angular samples device 16；
The straight-line motion mechanism includes linear mould group 9, linear drives decelerating motor 10, optoelectronic switch assembly 17, straight line
Position anti-backlash mechanism 19 and pinboard 12；
The turning positioning mechanical includes overturning locating piece 20 and adjusting screw 21；
The linear positioning mechanisms include rectilinear key 22 and adjusting screw 23；
Mounting base 1 in the substrate is fixedly connected with main support column 2, mounting base 1 and the fixed company of aiding support column 3
It connects, main support column 2 is fixedly connected with the rotary reducer 4 in turnover mechanism, the shaft 7 in 6 inner ring of bearing block and turnover mechanism
It is fixedly connected；
Linear motion support 8 in the turnover mechanism is fixedly connected with the linear mould group 9 in straight-line motion mechanism；
Pinboard 12 in the straight-line motion mechanism is fixedly connected with protective cover 13；
The turning positioning mechanical is fixedly connected with mounting base 1, and position is adjustable, and adjustment adjusts screw position, is protected
Demonstrate,prove turnover mechanism work it is vertical with the mounting plane of mounting base 1 to 14 mounting plane of ray detecting device when, adjust screw and
Limited block 11 in turnover mechanism contacts, positioning turning angle, and tightens the position that locking nut positioning adjusts screw；
The linear positioning mechanisms are fixedly connected with the linear motion support 8 in turnover mechanism, and position is adjustable, adjustment
Adjust screw position, guarantee straight-line motion mechanism work when moving to designated position to ray detecting device 14, adjust screw with
Straight line positioning anti-backlash mechanism 19 in straight-line motion mechanism contacts, and positions the position of ray detecting device 14, and tighten locking screw
Mother's positioning adjusts the position of screw；
Mounting base 1 in the substrate is respectively fixedly connected with main support column 2, aiding support column 3, aiding support column 3
It is fixedly connected with bearing block 6,6 inner ring of bearing block and 4 mounting-positioning holes of rotary decelerator of main support column 2 are concentric；
Rotary decelerator 4 in the turnover mechanism uses pivoting support and ring surface enveloped worm structure, worm and gear
For face contact, driving torque is big, and movement is steady, and low noise, the service life is long, and overturning driving decelerating motor 5 and rotary decelerator 4 are solid
Fixed connection, rotary decelerator 4 are fixedly connected with rotational positioning anti-backlash mechanism 18, rotational positioning anti-backlash mechanism 18 and linear motion
Support 8 is fixedly connected, and linear motion support 8 is fixedly connected with shaft 7, and shaft 7 is fixedly connected with angular samples device 16, and overturning is driven
When dynamic decelerating motor 5 works, linear motion support 8 makees flip-flop movement, and angular samples device 16 carries out the angle of linear motion support 8
Position sampling；
As shown in Fig. 3, the rotational positioning anti-backlash mechanism includes rotating the gap support 18-1 that disappears, rotating the gap output shaft that disappears
18-2, rotation anti-backlash 18-3, big stop collar 18-4, small stop collar 18-5 and holding screw 18-6；
The gap output shaft 18-2 that disappears that rotates is concentrically mounted in the center mounting hole for rotating the gap support 18-1 that disappears, and rotation disappears
Gap spring 18-3 it is radial and meanwhile be embedded in rotation disappear gap support 18-1 and rotation disappear gap output shaft 18-2 mounting groove in so that
Rotation, which disappears gap support 18-1, and rotation disappears has the ability of relative resilient rotation between gap output shaft 18-2, big stop collar 18-4 and
Small stop collar 18-5 is respectively embedded into that rotation disappears gap support 18-1 and rotation disappears in gap output shaft 18-2 and by holding screw 18-6
It is fixed, play the position-limiting action to rotation anti-backlash 18-3.
Rotation disappears gap support 18-1 and rotation disappears gap output shaft 18-2 respectively with 4 output shaft of rotary reducer and linear motion
Support 8 is fixedly connected, when turnover mechanism work is vertical with the mounting plane of mounting base 1 to 14 mounting plane of ray detecting device
When, the overturning locating piece 20 in turning positioning mechanical prevents linear motion support 8 from continuing to overturn, and rotation anti-backlash 18-3 is generated
Opposing torque make the worm gear of rotary decelerator 4, worm screw revolute pair be in close contact, eliminate the biography of rotary decelerator 4
Dynamic sideshake, guarantees the precise angular positions of ray detecting device 14；
Linear drives decelerating motor 10 in the straight-line motion mechanism is fixedly connected with linear mould group 9, linear mould group 9
Linear slide block is fixedly connected with straight line positioning anti-backlash mechanism 19, and straight line positioning anti-backlash mechanism 19 is fixedly connected with pinboard 12, directly
When line drives decelerating motor 10 to work, the linear slide block of linear mould group 9 makees straight reciprocating motion, ray detecting device 14 stretch out or
It retracts, optoelectronic switch assembly 17 determines the flexible extreme position of ray detecting device 14, optoelectronic switch assembly 17 and linear mould group 9
It is fixedly connected and position is adjustable.
As shown in Fig. 4, straight line positioning anti-backlash mechanism 19 includes that disappear gap support 19-1, straight line of straight line disappears gap piston
19-2 and compressed spring 19-3, the straight line gap piston 19-2 and compressed spring 19-3 that disappears are located at straight line and disappear the mounting groove of gap support 19-1
Interior, compressed spring 19-3 is in pre-compressed state, and straight line disappears gap piston 19-2 under external force can be along compressed spring 19-3
Axis direction movement.
The disappear upper and lower ends of gap support 19-1 of straight line are fixedly connected with pinboard 12 and linear 9 sliding block of mould group respectively, when straight
When line movement mechanism runs to ray detecting device 14 and is in designated position, rectilinear key 22 and straight line the gap piston 19-2 that disappears are connect
Compressed spring 19-3 is touched and compresses, limitation pinboard 12 continues to move, and the opposite force that compressed spring 19-3 is generated is disappeared by straight line
Gap support 19-1 passes to linear mould group 9, so that linear transmission pair is in close contact, eliminates the transmission side of linear transmission mechanism
Gap guarantees ray detecting device more than 14 times to return to fixed position after moving back and forth.
The protective cover 13 is fixedly connected with ray detecting device 14, prevents ray detecting device 14 from directly being hit；
The anti-collision mechanism 15 is fixedly connected with ray detecting device protective cover 13, when anti-collision mechanism 15 is squeezed by external force
After when being subjected to displacement, the anti-collision switch of triggering anti-collision mechanism 15 is sent to host by collision alarm, the sensitivity of anti-collision mechanism 15
It is adjustable；
After the electronic portal imaging device EPID positioning device receives positioning instruction, turnover mechanism first makees expansion movement, operation
To the mounting plane upright position of 14 mounting plane of ray detecting device and mounting base 1, then, straight-line motion mechanism stretches out
Movement, is located in designated position for ray detecting device 14；During expansion, when anti-collision mechanism 15 is squeezed displacement, electricity
Sub- Real time portal imaging positioning device rotates backward initial angle, and during stretching, anti-collision mechanism 15 is squeezed displacement
When, electronic portal imaging device EPID positioning device counter motion to initial position accelerates after the completion of ray detecting device 14 positions
In the device course of work, when anti-collision mechanism 15 is squeezed displacement, accelerator makees corresponding disposition according to by collision alarm, is being collided
After reason releases and presses trouble shooting key, it just can be carried out and act in next step；
After the electronic portal imaging device EPID positioning device receives reset instruction, retract action is first completed, then completes to withdraw
Rotary movement；In reseting procedure, when anti-collision mechanism 15 is squeezed displacement, electronic portal imaging device EPID positioning device is reversely moved
Make, after being released by collision reason and pressing trouble shooting key, just can be carried out and act in next step.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of medical accelerator electronic portal imaging device EPID positioning device, which is characterized in that the positioning device include pedestal,
Turnover mechanism, rotational positioning anti-backlash mechanism, turning positioning mechanical, straight-line motion mechanism, straight line positioning anti-backlash mechanism, straight line positioning
Mechanism and ray detecting device；
On the base, turnover mechanism realizes the rotation around mounting axis, is mounted on turning positioning mechanical for the turnover mechanism installation
On turning positioning mechanical mechanical position limitation is carried out to the flip angle of turnover mechanism, the rotational positioning being mounted on turnover mechanism disappears
Gap mechanism eliminates the transmission sideshake of turnover mechanism；The straight-line motion mechanism is mounted on turnover mechanism, X-ray detection X
Device is mounted on straight-line motion mechanism, and the linear positioning mechanisms being mounted on turnover mechanism transport the straight line of straight-line motion mechanism
Dynamic to carry out mechanical position limitation, the straight line positioning anti-backlash mechanism in straight-line motion mechanism disappears to the transmission sideshake of linear transmission mechanism
It removes.
2. medical accelerator as described in claim 1 electronic portal imaging device EPID positioning device, which is characterized in that described to turn over
Rotating positioning mechanism is including overturning locating piece and adjusts screw, and linear positioning mechanisms include rectilinear key and adjusting screw；It is described
The position that adjusting screw on overturning locating piece and rectilinear key limits needed for being used to finely tune.
3. medical accelerator as claimed in claim 1 or 2 electronic portal imaging device EPID positioning device, which is characterized in that institute
Stating pedestal includes mounting base, main support column, aiding support column and bearing block；Main support column and aiding support column are vertically fixed on
On mounting base, bearing block is mounted on aiding support column.
4. medical accelerator as claimed in claim 3 electronic portal imaging device EPID positioning device, which is characterized in that described to turn over
Rotation mechanism include rotary decelerator, overturning driving decelerating motor, rotational positioning anti-backlash mechanism, shaft, linear motion support and
Angular samples device；
The rotary reducer is fixedly connected with main support column, and overturning driving decelerating motor is fixedly connected with rotary decelerator,
Rotary decelerator is fixedly connected with rotational positioning anti-backlash mechanism, rotational positioning anti-backlash mechanism and the fixed company of linear motion support
It connects, linear motion support is mounted on bearing block by shaft, and shaft is fixedly connected with angular samples device, and overturning driving is slowed down electric
When machine works, linear motion support makees flip-flop movement, and angular samples device carries out the angle position sampling of linear motion support.
5. medical accelerator as described in claim 1 electronic portal imaging device EPID positioning device, which is characterized in that described turn
Dynamic positioning anti-backlash mechanism includes rotating the gap support that disappears, rotating the gap output shaft that disappears, rotation anti-backlash, big stop collar, small stop collar
And holding screw；
The gap output shaft that disappears that rotates is concentrically mounted in the center mounting hole for rotating the gap support that disappears, and rotation anti-backlash is in radiation
Shape be embedded in simultaneously rotation disappear gap support and rotation disappear gap output shaft mounting groove in so that rotation disappears gap support and the rotation gap that disappears is defeated
Has the ability of relative resilient rotation between shaft, big stop collar and small stop collar are respectively embedded into that rotation disappears gap support and rotation disappears
It is fixed in gap output shaft and by holding screw, plays the position-limiting action to rotation anti-backlash.
6. medical accelerator as described in claim 1 electronic portal imaging device EPID positioning device, which is characterized in that described straight
Line movement mechanism includes linear mould group, linear drives decelerating motor, optoelectronic switch assembly and pinboard；
Linear drives decelerating motor is fixedly connected with linear mould group, and linear slide block and straight line the positioning anti-backlash mechanism of linear mould group are solid
Fixed connection, straight line positioning anti-backlash mechanism are fixedly connected with pinboard, when the work of linear drives decelerating motor, linear mould group it is linear
Sliding block makees straight reciprocating motion, and the linear slide block of linear mould group drives ray detecting device to stretch out or retract, light by pinboard
Electric switch unit determines the flexible extreme position of ray detecting device, and optoelectronic switch assembly is fixedly connected with linear mould group and position
It is adjustable.
7. medical accelerator as claimed in claim 6 electronic portal imaging device EPID positioning device, which is characterized in that described straight
Line positioning anti-backlash mechanism includes that disappear gap support, straight line of straight line disappears gap piston and compressed spring, and straight line disappears gap piston and compressed spring
In the mounting groove that straight line disappears gap support, compressed spring is in pre-compressed state, and the straight line gap piston that disappears under external force can
It is enough to be moved along compressed spring axis direction；
The disappear upper and lower ends of gap support of straight line are fixedly connected with pinboard and linear mould group sliding block respectively, when straight-line motion mechanism is transported
When row be in designated position to ray detecting device, rectilinear key and straight line, which disappear, gap piston contact and compresses compressed spring, limit
Pinboard processed continues to move, and the opposite force that compressed spring generates passes to linear mould group by the straight line gap support that disappears, so that straight line
Transmission is in close contact, and eliminates the transmission sideshake of linear transmission mechanism, guarantees to return after ray detecting device repeatedly moves back and forth
To fixed position.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591379.2A CN109954228B (en) | 2018-12-25 | 2018-12-25 | Electronic radiation field image system positioning device for medical accelerator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811591379.2A CN109954228B (en) | 2018-12-25 | 2018-12-25 | Electronic radiation field image system positioning device for medical accelerator |
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| CN109954228B CN109954228B (en) | 2021-03-12 |
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|---|---|
| CN109954228B (en) | 2021-03-12 |
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