CN205486166U - Vane of multi -vane collimator positioner based on texture features - Google Patents
Vane of multi -vane collimator positioner based on texture features Download PDFInfo
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- CN205486166U CN205486166U CN201620064925.7U CN201620064925U CN205486166U CN 205486166 U CN205486166 U CN 205486166U CN 201620064925 U CN201620064925 U CN 201620064925U CN 205486166 U CN205486166 U CN 205486166U
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Abstract
The utility model discloses a vane of multi -vane collimator positioner based on texture features all is equipped with a signal acquisition optic fibre on every blade, along the direction wiring that is on a parallel with blade length, be close to the fiber end face of blade head position and aim at the blade surface perpendicularly, and have certain clearance between fiber end face and the blade upper surface, every blade upper surface of multi -leaf collimator all is equipped with the alternate stripe of periodic light and shade, the device still includes processing circuit, with the signal acquisition fiber connection is carried out the optical signal who gathers photoelectric conversion and handles obtaining pulse signal to carry out pulse count to this pulse signal, the device still includes direction of motion acquisition circuit, is connected with the encoder of taking certainly of driving vane's motor. The utility model discloses a blade positioning of high accuracy to positioner long -term stability and reliability's under the radiation ring border operation has been guaranteed.
Description
Technical field
This utility model relates to blade locking device, particularly relates to a kind of leafy collimation based on textural characteristics
Device blade locking device.
Background technology
In accurate radiotherapy, need formation reported as precisely as possible and target region shape one on the projecting direction of target area
The irradiation field caused, therefore the accuracy to irradiation field shape has higher requirement.
Multi-diaphragm collimator is used to produce the mechanical moving element of conformal radiation field size, is commonly called as multi-leaf optical grating, many
Leaf diaphragm etc., is widely used in medical domain, and multi-diaphragm collimator is to realize accurate radiotherapy launched field shape at present
The main equipment of shape.The levels of precision of multi-diaphragm collimator blade movement position directly affects irradiation field shape
Accuracy.
In prior art, the location to multi-diaphragm collimator mainly uses capacitance plate formula feedback or magnetic grid feedback
Formula, but contact positioner can easily cause the mill of device with blade contact relative movement occurs
Damaging, therefore the service life of contact positioner is short, reliability of positioning is the most poor.Contactless mainly
Using ruby to coordinate CCD camera location mode, this cordless is chronically at spoke due to CCD camera
Penetrating in environment, CCD chip easily lost efficacy, and needed often to change CCD camera.
Utility model content
The technical problems to be solved in the utility model is for the making of contact positioner in prior art
The defect short with the life-span, reliability of positioning is the most poor, and contactless need CCD chip easily to lose efficacy,
Need often to change the defect of CCD camera, it is provided that a kind of contactless based on textural characteristics leafy standard
Straight device blade locking device.
This utility model solves its technical problem and be the technical scheme is that
There is provided a kind of multi-diaphragm collimator blade locking device based on textural characteristics, including a signals collecting
Optical fiber, connects up along the direction being parallel to length of blade, and the fiber end face near leaf head position is the most right
Certain gap is there is between quasi-blade surface, and fiber end face and blade upper surface；Multi-diaphragm collimator
Blade upper surface is provided with periodic light and shade striated structure；
This device also includes signal processing circuit, is connected with described signals collecting optical fiber, the optical fiber that will gather
Signal carries out opto-electronic conversion and process obtains pulse signal, and this pulse signal is carried out step-by-step counting；
This device also includes direction of motion Acquisition Circuit, is connected with the encoder that carries of the motor driving blade.
In device described in the utility model, described signals collecting optical fiber is attached to former multi-diaphragm collimator and installs electricity
The position of Rong Ping.
In device described in the utility model, the cycle of described periodic light and shade striped is 0.01-0.2mm.
In device described in the utility model, the gap between fiber end face and blade upper surface is
0.01-0.5mm。
In device described in the utility model, shaping circuit that described signal processing circuit includes being sequentially connected with,
Peaker sum counter, described shaping circuit is connected with described signals collecting optical fiber.
In device described in the utility model, described signals collecting optical fiber is radiation-resistant fiber.
This utility model produces and provides the benefit that: this utility model is by contactless blade location dress
Put the blade to multi-diaphragm collimator to position, thus avoid the abrasion of device.By at blade table
Face makes accurate periodicity light and shade striated structure, according to the reflected signal record optical fiber of optical fiber through each
The number of the reflected light signal obtained after individual grating, thus obtain the blade displacement relative to optical fiber head
Amount.By direction of motion Acquisition Circuit, from feedback signal with encoder, obtain motor from motor and rotate forward
Inversion information, then by judging the motion side driving the rotating forward of the motor of blade, reversion to be achieved with blade
To information, it is achieved thereby that high-precision blade location, and ensure that positioner is long under radiation environment
The operation that phase is reliable and stable.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the partial structurtes that this utility model embodiment signals collecting optical fiber is arranged on multi-diaphragm collimator
Schematic diagram；
Fig. 2 is the reflected signal schematic diagram of the output of this utility model embodiment single signals collecting optical fiber；
Fig. 3 is the structural representation of this utility model embodiment signal processing circuit.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with attached
Figure and embodiment, be further elaborated to this utility model.Should be appreciated that described herein
Specific embodiment, only in order to explain this utility model, is not used to limit this utility model.
The multi-diaphragm collimator blade locking device based on textural characteristics of this utility model embodiment, such as Fig. 1
Shown in, each blade 3 is equipped with a signals collecting optical fiber 1, along the direction cloth being parallel to length of blade
Line, fiber end face perpendicular alignmnet blade surface near leaf head position is, and on fiber end face and blade
Certain gap is there is between surface；Each blade upper surface of multi-diaphragm collimator is equipped with the brightest
Striated structure 2 between dark phase, signals collecting fiber perpendicular is arranged in blade surface.This device also includes signal
Process circuit, be connected with signals collecting optical fiber, the fiber-optic signal of collection carried out opto-electronic conversion and processes,
Obtain the pulse signal of blade moving direction, and obtain blade in periodicity light and shade according to pulse count signal
The striped number of movement on alternate striated structure, according to striped number and width of fringe, it is possible to
The distance moved to blade.
In one embodiment of the present of invention, multi-diaphragm collimator blade locking device can only include one total
Signal processing circuit, processes the signal of signals collecting optical fiber corresponding to different leaves simultaneously.Multi-diaphragm collimator
Blade locking device can also include multiple signal processing circuit, and each processes signals collecting optical fiber respectively
Signal.
This device also includes direction of motion Acquisition Circuit, is connected with the encoder that carries of motor, the fortune of blade
Dynamic directional information can be by judging that the rotating forward of the motor of driving blade, reversion obtain, and motor rotates forward reversion to be believed
Breath can obtain from feedback signal with encoder from motor.
In a preferred embodiment of the present utility model, take the mode of grating photoelectric reading, by leaf
Sheet 3 surface makes accurate scale (the most periodic light and dark striated structure 2), and record optical fiber passes through
The number of the reflection light pulse signal obtained after each striped, thus obtain blade relative to optical fiber
The displacement of head.
On the position of the capacitance plate that optical fiber may be installed original multi-diaphragm collimator, to replace capacitance plate.Optical fiber
The upper surface of end face perpendicular alignmnet blade.Transmission Fibers againsts capacitance plate position, and along being parallel to leaf
The direction cabling of leaf length, to close leaf head position still further below, perpendicular alignmnet blade surface.Optical fiber
End face is 0.01-0.5mm with the distance of blade upper surface, as may be designed as 0.1mm, to ensure reflection light
Effectively collected by optical fiber.When moving the most afterwards, this distance keeps constant as far as possible, prevents from receiving
The strong and weak change of the reflection light of collection, forms interference signal.
The light and dark striated structure of periodicity of blade upper surface, it is possible to when optical fiber is with blade relative movement,
The light intensity making the reflection light of optical fiber forms periodically change, and its cycle is between 0.01-0.2mm.
According to the whole system demand to positioning precision, in order to realize ± repetitive positioning accuracy of 0.3mm, leaf
The cycle of the light and dark striated structure on sheet surface needs little as far as possible.Mode field diameter due to single-mode fiber
Be (MFD) 10.5 ± l.0nm, it is 0.14 as numerical aperture (NA), say, that the list of the emergent light of optical fiber
The limit angle of divergence is about 8 degree.So for the place of distance fiber end face 0.1mm, the emergent light of optical fiber
Spot diameter is about 0.028mm.
Emergent light, after blade surface reflects, returns to the position of fiber end face, and part light is collected by optical fiber,
It is transferred to follow-up system as reflected signal.Optical fiber is by the numerical value of optical fiber to the capacity gauge of reflection light
(NA) determines in aperture.It is to say, only at fiber core scope, the angle of incidence luminous energy quilt less than 8 degree
Optical fiber is collected.Therefore, actually in the range of the hot spot of 0.028mm diameter, the only diameter of central authorities is less than
The hot spot of 10.5 microns can be reflected to optical fiber thus be collected.Therefore, in theory, if blade table
The cycle of the light and dark striated structure in face is not less than this value, and optical fiber just can be by the change of reflective light intensity
Identify the movement of striped.
Therefore, for telecommunication optical fiber, it can identify the hot spot change of 0.01mm, therefore to realize ±
The repetitive positioning accuracy of 0.3mm, will accomplish the size of light and dark striated structure as far as possible less than this value
Ten times.
When optical fiber and blade generation relative movement when, due to the light and shade structure of blade surface striped, make
Obtain the reflected light signal collected by optical fiber and the change of power can occur.As in figure 2 it is shown, reflection light often arrives one
Individual peak value, means that blade moves the distance in the cycle of a striped, and the mode such as by counting is come
Carry out the displacement measurement of blade.But so can only obtain the size of the distance of movement, can not be moved
The information in dynamic direction.
In order to differentiate the moving direction of blade, by judging the driving rotating forward of motor of blade, reversion
Obtaining, motor rotates forward inversion information and obtains from feedback signal with encoder from motor.
In an embodiment of the present utility model, the optical signal in optical fiber is transformed into electricity through opto-electronic conversion
Signal, by shaping circuit shaping, obtains square wave.Processing through peaker, obtaining can be for counting again
The pulse signal of device counting.As illustrated in the block diagram of fig. 3, what signal processing circuit included being sequentially connected with is whole
Shape circuit, peaker sum counter, shaping circuit is connected with signals collecting optical fiber.
According to overall system performance index, it is considered to system redundancy coefficient is 4, then blade translational speed reaches 80
mm/s.If the light and dark striated structure cycle design of blade surface is 0.01mm, then produced anti-
The signal frequency penetrating light is 8000Hz, and the response frequency of general photodiode is substantially all
More than 100kHz, therefore, it is possible to well detect the signal of generation of each light and dark striated structure cycle.
The impact that optical fibre device may be caused for the radiation environment of the gamma ray residing for blade, one
Original capacitance plate is made the material of anti-radiation protection by aspect, on the other hand chooses radiation-resistant fiber as biography
Lose fibre, to reduce the radiation impact on fiber transmission attenuation.
At present, the long companies such as (Y FC) that flies all has the radiation-resistant fiber product of maturation.Such as Chang Fei company
Radioprotective single-mode fiber, according to TIA/EIA 455 64 standard testing, it is in accumulated dose 50krad,
Close rate is that under the continuous impulse irradiation of 0.1rad/s, the added losses at 1310nm window are less than
3dB/km's.Such optical fiber, for medical gamma radiation environment, adds corresponding anti-radiation protection, permissible
Ensure the running that signal transmission through fiber is steady in a long-term.
This utility model carries out the displacement measurement of blade by the way of counting, and the precision of its location is main
It is decided by the measure of precision of the scale of blade surface.Due to the numerical aperture of optical fiber and core mode field diameter all
Enough is little so that the optical fiber spatial discrimination dynamics when collecting incident illumination is bigger.As previously discussed,
Single-mode fiber can differentiate the hot spot of 0.01mm.Therefore, by the mode of fiber orientation, 0.01mm can be reached
The precision of magnitude.
It should be appreciated that for those of ordinary skills, can be changed according to the above description
Enter or convert, and all these modifications and variations all should belong to the protection of this utility model claims
Scope.
Claims (6)
1. a multi-diaphragm collimator blade locking device based on textural characteristics, it is characterized in that, a signals collecting optical fiber it is equipped with on each blade, along the direction wiring being parallel to length of blade, near the fiber end face perpendicular alignmnet blade surface of leaf head position, and between fiber end face and blade upper surface, there is certain gap；Each blade upper surface of multi-diaphragm collimator is equipped with periodic light and dark striated structure；
This device also includes signal processing circuit, is connected with described signals collecting optical fiber, the fiber-optic signal of collection carries out opto-electronic conversion and process obtains pulse signal, and this pulse signal is carried out step-by-step counting；
This device also includes direction of motion Acquisition Circuit, is connected with the encoder that carries of the motor driving blade.
Device the most according to claim 1, it is characterised in that described signals collecting optical fiber is attached to former multi-diaphragm collimator and installs the position of capacitance plate.
Device the most according to claim 1, it is characterised in that the cycle of described periodic light and shade striped is 0.01-0.2mm.
Device the most according to claim 1, it is characterised in that the gap between fiber end face and blade upper surface is 0.01-0.5mm.
Device the most according to claim 1, it is characterised in that described signal processing circuit includes shaping circuit, the peaker sum counter being sequentially connected with, described shaping circuit is connected with described signals collecting optical fiber.
Device the most according to claim 1, it is characterised in that described signals collecting optical fiber is radiation-resistant fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620064925.7U CN205486166U (en) | 2016-01-22 | 2016-01-22 | Vane of multi -vane collimator positioner based on texture features |
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| CN201620064925.7U CN205486166U (en) | 2016-01-22 | 2016-01-22 | Vane of multi -vane collimator positioner based on texture features |
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| CN205486166U true CN205486166U (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272659A (en) * | 2017-07-25 | 2017-10-20 | 上海联影医疗科技有限公司 | A kind of monitoring method of multi-diaphragm collimator and its state |
-
2016
- 2016-01-22 CN CN201620064925.7U patent/CN205486166U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272659A (en) * | 2017-07-25 | 2017-10-20 | 上海联影医疗科技有限公司 | A kind of monitoring method of multi-diaphragm collimator and its state |
| CN107272659B (en) * | 2017-07-25 | 2020-04-24 | 上海联影医疗科技有限公司 | Multi-leaf collimator and state monitoring method thereof |
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