CN106037773A - Blade position real-time monitoring system of MLC (multi-leaf collimator) system - Google Patents
Blade position real-time monitoring system of MLC (multi-leaf collimator) system Download PDFInfo
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- CN106037773A CN106037773A CN201610343631.2A CN201610343631A CN106037773A CN 106037773 A CN106037773 A CN 106037773A CN 201610343631 A CN201610343631 A CN 201610343631A CN 106037773 A CN106037773 A CN 106037773A
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- China
- Prior art keywords
- blade
- mlc
- time monitoring
- monitoring system
- slide rail
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
- A61B6/547—Control of apparatus or devices for radiation diagnosis involving tracking of position of the device or parts of the device
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
Abstract
The invention relates to a position detecting device, and in particular relates to a blade position real-time monitoring system of an MLC (multi-leaf collimator) system. The blade position real-time monitoring system comprises a control computer, a control chip, an A/D converter for providing position feedback information to the control chip, a multi-way selection signal collector for collecting information and transmitting the information to the A/D converter, as well as a motor revolution counter and a blade position sensor which are connected with the multi-way selection signal collector.
Description
Technical field
The present invention relates to position detecting device, particularly relate to a kind of MLC system leaf position real-time monitoring system.
Background technology
Medical electronic linear accelerator, for making irradiation field to greatest extent close to tumor shape, is provided with greatly leafy collimation
Device (multi-leaf collimator), is called for short MLC system, thus minimize degree affect normal structure to greatest extent
The purpose of killing tumor cell.The operational approach kept off than lead due to MLC system more accurately and quickly, is furnished with MLC system at present
Clinac medical institutions throughout the country in apply more and more extensive.Along with the raising of Medical Technology, radiation
Safety and reliability in treatment requires more and more higher, confirms that the position of each blade of MLC is medical the most real-time and accurately
One of critically important link of linear accelerator quality control efforts.
MLC system is the attachment device of clinac, is made up of hardware system and software system.Hardware system is again
Being divided into control computer and MLC cell two parts, control computer and send radiation field size instruction, MLC cell part is used for producing spoke
Launched field, is arranged on the collimator of accelerator, including MLC drive part, machine driven system and feedback control circuit, mainly has
Lead blade, screw rod, nut etc., lead leaf typically by 20 to, 40 to or lead flake that the 60 pairs of thickness is 2～3mm form, each blade is joined
A standby micromachine, by actuating device, micromachine can band moving vane stretching motion, all blades stretch in order, can
MLC is made to form specific shape.Be connected between adjacent blades face concaveconvex structure each other, has close structure, good leak-proof effect
Etc. feature.
Blade displacement distance controlling utilizes the encoding function of micromachine, the displacement correspondence driven by motor of one pitch of blade
Screw mandrel rotates a circle, according to blade displacement numerical value, obtains the number of turns rotated needed for motor, motor of thus deriving divided by screw mandrel pitch
The coding count returned after rotateing in place, thus initialization counter technology interrupt judging that blade displacement is by enumerator
No put in place.
Its work process is to control computer to send after radiation field size prescription instructs control computer, and controlling computer will be each
The location parameter of blade is converted into the required number of turns rotated of each sliding-vane motor, then sends operating instruction to each single-chip microcomputer, then
By ISP interface circuit to motor driving circuit board, motor driving circuit board drives the operating of each paddle motor, each motor internal band
Having revolution coding count element, the revolution reaching to set forms radiation field size after i.e. putting in place, starts emergent ray.
The performance-critical of MLC is motion accuracy and the movement velocity of blade, in MLC system real work, and respectively
The revolution counter of screw rod, nut and the motor self that motors access node closes is easy to error or fault occur, causes blade
Positional fault, thus cause x radiation x open country wrong or inaccurate, so a kind of MLC leaf position prison in real time of necessary design
Ore-controlling Role monitor vaned position meet the numerical value of setting, the once position letter of the position signalling of monitoring in real time and setting
Count value is the most corresponding, then the false information that reports an error is pointed out, and stops bundle, protects patient safety.
Summary of the invention
The technical problem to be solved in the present invention is how to overcome the deficiencies in the prior art, it is provided that a kind of MLC system blade position
Put real-time monitoring system.
The present invention the technical scheme is that a kind of MLC system leaf position real-time monitoring system for achieving the above object,
MLC system is made up of main body rack and blade, blade slide rail, it is characterised in that: include controlling computer, control chip, offer
Position feedback information to the A/D modular converter of control chip, carry out information gathering and pass to the multi-path choice of A/D modular converter
Signal picker, the motor rotations enumerator being connected with multi-path choice signal picker and blade position sensor, also include driving
The motor of moving vane and in order to control inverter and the power supply of motor, wherein said control chip is by the drive circuit connected
Inverter is controlled, is accurately realized by motor with the positional information realized control computer sends.
As preferably, described data acquisition circuit uses MAX306, and described A/D change-over circuit uses ADS-CCD1202MC.
As preferably, described control chip uses FPGAPL68C, and described drive circuit uses A3952SLB.
As preferably, described blade position sensor includes the resistive layer being positioned at blade slide rail upper end and is arranged on blade
Electrically conductive elastic ball on end face, described electrically conductive elastic bag includes spring and sliding ball, and described sliding ball pressing spring is embedded in leaf
In the groove arranged on end face on sheet, electrically conductive elastic bead contacts with the resistive layer of blade slide rail upper end, described leaf position
Sensor uses and identifies that voltage value signal analyzes the physical location judging blade.
Further, form variable-resistance potentiometer system between described electrically conductive elastic ball, blade and blade slide rail, make leaf
Sheet slide rail is as DC supply input, and blade is as DC output end, when blade moves, drives electrically conductive elastic ball, changes
Become the contact position with blade slide rail, change the output voltage of blade.
As preferably, the side of described blade is provided with groove, is provided with tooth bar, the side of described blade slide rail in described groove
Being provided with the gear being meshed with described tooth bar, described gear connects has conducting rod, the outside of described gear to be provided with a homogenizing
Semicircular arc resistance, described conducting rod contacts with semicircular arc resistance, and described leaf position detector includes blade side
Tooth bar, gear, conducting rod and semicircular arc resistance.
Further, conducting rod and semicircular arc resistance form arc potentiometer, using conducting rod as DC output end, and half
Circular arc resistance as DC supply input end, blade, is rotated by rack drives gear, drives conduction further when mobile
Bar, makes conducting rod that position change to occur on semicircular arc resistance, causes the change of output voltage.
It is an advantage of the current invention that: the position of blade can be accurately identified, it is to avoid traditional by technology humanized motor
The number of turns calculates the inaccurate shortcoming of vane position information.
Accompanying drawing explanation
Fig. 1 leaf position of the present invention monitoring system schematic diagram.
Fig. 2 blade position sensor of the present invention part-structure schematic diagram.
Fig. 3 blade position sensor of the present invention part-structure-blade construction schematic diagram.
Fig. 4 blade position sensor of the present invention part-structure-blade slide rail schematic diagram.
Detailed description of the invention
Embodiment 1
As it is shown in figure 1, a kind of MLC system leaf position real-time monitoring system, MLC system is by main body rack and blade 1, leaf
Sheet slide rail 2 forms, including control computer, control chip, offer position feedback information to the A/D modular converter of control chip,
Carry out information gathering and pass to the multi-path choice signal picker of A/D modular converter, be connected with multi-path choice signal picker
Motor rotations enumerator and blade position sensor, also include drive blade 1 motor and in order to control the inversion of motor
Device and power supply, inverter is controlled by wherein said control chip by the drive circuit connected, to realize calculating control
The positional information that machine sends accurately is realized by motor.
Described data acquisition circuit uses MAX306, and described A/D change-over circuit uses ADS-CCD1202MC, described control
Chip uses FPGAPL68C, and described drive circuit uses A3952SLB.
As in figure 2 it is shown, described blade position sensor includes the resistive layer being positioned at blade slide rail 2 upper end and is arranged on blade
Electrically conductive elastic ball on end face on 1, described electrically conductive elastic bag includes spring 11 and sliding ball 12, described sliding ball 12 pressing spring
11 are embedded on blade 1 in the groove 13 arranged on end face, and electrically conductive elastic bead connects with the resistive layer of blade slide rail 2 upper end
Touching, described blade position sensor uses and identifies that voltage value signal analyzes the physical location judging blade 1.
Form variable-resistance potentiometer system between electrically conductive elastic ball, blade 1 and blade slide rail 2, make blade slide rail 2
One end is as DC supply input, and one end of blade is as DC output end, when blade 1 moves, drives electrically conductive elastic
Ball, changes the contact position with blade slide rail 2, changes the output voltage of blade 1, the position of different magnitude of voltage correspondence blades 1
Information.
The operation principle of the present invention is: first pass through control computer export position data to the control chip of MLC system,
Position given information is passed to the drive circuit connected by control chip, and drive circuit passes through Driven by inverter revolution, enters
One step realizes the displacement of blade 1；While revolution, the horse that motor rotations enumerator and blade position sensor will be collected
The information of voltage (the actual positional information referring to blade) of the number of turns and blade 1 output that reach rotation passes to multi-path choice incessantly
Signal picker, the relevant information received is passed to A/D modular converter by multi-path choice signal picker, and further, A/D turns
The information of voltage that the number of turns and the blade 1 of revolution export is passed to control chip, by the process of control chip by die change block
With analyzing and comparing with position given information, the position given information received is made suitably adjustment, simultaneously also by position
Feedback information passes to the physical location controlling computer to show blade 1 in real time, forms motor rotations, potentiometer type position biography
The leaf position double check system of sensor.
Example 2 in real time
As shown in Figure 3,4, the end face of described blade 1 is provided with groove, is provided with tooth bar 14, described blade slide rail in described groove
The end face of 2 is provided with the gear 21 being meshed with described tooth bar 14, and described gear 21 connects conducting rod 22, described gear 21
Outside is provided with a homogenizing semicircular arc resistance 23, and described conducting rod 22 contacts with semicircular arc resistance 23, described blade position
Put detector and include the tooth bar 14 of blade end face, gear 21, conducting rod 22 and semicircular arc resistance 23, conducting rod 22 and semi arch
Shape resistance 23 forms arc potentiometer, and using conducting rod 22 as DC output end, the side of semicircular arc resistance 22 is as directly
Stream electrical input, blade 1, when mobile, is rotated by tooth bar 14 driven gear 21, drives conducting rod 22 further, makes conducting rod
22 there is position change on semicircular arc resistance 23, cause the change of output voltage, the position of different magnitude of voltage correspondence blades
Confidence ceases.Remaining is with embodiment 1.
Above-described embodiment simply to illustrate that the technology design of the present invention and feature, its objective is to be to allow in this area
Those of ordinary skill will appreciate that present disclosure and implements according to this, can not limit the scope of the invention with this.All
It is the change according to the equivalence done by the essence of present invention or modification, all should contain within the scope of the present invention.
Claims (7)
1. a MLC system leaf position real-time monitoring system, MLC system is made up of main body rack and blade, blade slide rail, its
Be characterised by: include control computer, control chip, offer position feedback information to the A/D modular converter of control chip, carry out
Information gathering also passes to the multi-path choice signal picker of A/D modular converter, the horse that is connected with multi-path choice signal picker
Reach revolution counter and blade position sensor, also include driving the motor of blade and in order to control inverter and the electricity of motor
Source, inverter is controlled by wherein said control chip by the drive circuit connected, to realize sending control computer
Positional information accurately realized by motor.
A kind of MLC system leaf position real-time monitoring system the most according to claim 1, it is characterised in that: described data
Acquisition Circuit uses MAX306, and described A/D change-over circuit uses ADS-CCD1202MC.
A kind of MLC system leaf position real-time monitoring system the most according to claim 1, it is characterised in that: described control
Chip uses FPGAPL68C, and described drive circuit uses A3952SLB.
A kind of MLC system leaf position real-time monitoring system the most according to claim 1, it is characterised in that described blade
Position sensor includes the resistive layer being positioned at blade slide rail upper end and the electrically conductive elastic ball being arranged on blade on end face, described in lead
Electricity elastic ball includes that spring and sliding ball, described sliding ball pressing spring are embedded on blade in the groove arranged on end face, leads
Electricity elastic pellet contacts with the resistive layer of blade slide rail upper end, and described blade position sensor uses and identifies voltage value signal
Analyze the physical location judging blade.
A kind of MLC system leaf position real-time monitoring system the most according to claim 4, it is characterised in that: described conduction
Form variable-resistance potentiometer system between elastic ball, blade and blade slide rail, make blade slide rail as DC supply input
End, blade is as DC output end, when blade moves, drives electrically conductive elastic ball, changes the contact position with blade slide rail,
Change the output voltage of blade.
A kind of MLC system leaf position real-time monitoring system the most according to claim 1, it is characterised in that: described blade
End face be provided with groove, be provided with tooth bar in described groove, the end face of described blade slide rail is provided with the tooth being meshed with described tooth bar
Wheel, described gear connects and has conducting rod, the outside of described gear to be provided with a homogenizing semicircular arc resistance, described conducting rod with
Semicircular arc resistance contacts, and described leaf position detector includes the tooth bar of blade end face, gear, conducting rod and semicircular arc
Resistance.
A kind of MLC system leaf position real-time monitoring system the most according to claim 6, it is characterised in that: conducting rod and
Semicircular arc resistance forms arc potentiometer, and using conducting rod as DC output end, semicircular arc resistance is defeated as unidirectional current
Entering end, blade, when mobile, rotated by rack drives gear, drives conducting rod further, makes conducting rod at semicircular arc electricity
There is position change in resistance, cause the change of output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343631.2A CN106037773A (en) | 2016-05-20 | 2016-05-20 | Blade position real-time monitoring system of MLC (multi-leaf collimator) system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610343631.2A CN106037773A (en) | 2016-05-20 | 2016-05-20 | Blade position real-time monitoring system of MLC (multi-leaf collimator) system |
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| Publication Number | Publication Date |
|---|---|
| CN106037773A true CN106037773A (en) | 2016-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610343631.2A Pending CN106037773A (en) | 2016-05-20 | 2016-05-20 | Blade position real-time monitoring system of MLC (multi-leaf collimator) system |
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Citations (9)
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|---|---|---|---|---|
| CN1413746A (en) * | 2001-10-23 | 2003-04-30 | 深圳市一体智能技术有限公司 | Forming detection method of multi-blade collimator and multi-blade collimator |
| CN1530151A (en) * | 2003-03-13 | 2004-09-22 | ��ʽ���綫֥ | Multiblade collimator |
| US20060193441A1 (en) * | 2005-02-28 | 2006-08-31 | Cadman Patrick F | Method and apparatus for modulating a radiation beam |
| CN101739034A (en) * | 2008-11-12 | 2010-06-16 | 深圳市海博科技有限公司 | Method for controlling movement of multi-diaphragm collimator |
| CN102755696A (en) * | 2012-07-09 | 2012-10-31 | 清华大学 | Multi-blade collimator for tomotherapy and dynamic intensity modulated radiation therapy and control method of multileaf collimator |
| CN103272338A (en) * | 2013-05-20 | 2013-09-04 | 清华大学 | Radiotherapy equipment and radiotherapy system with radiotherapy equipment |
| CN103462624A (en) * | 2013-09-05 | 2013-12-25 | 中国科学院深圳先进技术研究院 | X-ray generator beam limiting device and blade driving device thereof |
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| CN105006319A (en) * | 2015-07-10 | 2015-10-28 | 吴忠仪表有限责任公司 | Feedback device for electric actuating mechanism |
-
2016
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Patent Citations (9)
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|---|---|---|---|---|
| CN1413746A (en) * | 2001-10-23 | 2003-04-30 | 深圳市一体智能技术有限公司 | Forming detection method of multi-blade collimator and multi-blade collimator |
| CN1530151A (en) * | 2003-03-13 | 2004-09-22 | ��ʽ���綫֥ | Multiblade collimator |
| US20060193441A1 (en) * | 2005-02-28 | 2006-08-31 | Cadman Patrick F | Method and apparatus for modulating a radiation beam |
| CN101739034A (en) * | 2008-11-12 | 2010-06-16 | 深圳市海博科技有限公司 | Method for controlling movement of multi-diaphragm collimator |
| CN102755696A (en) * | 2012-07-09 | 2012-10-31 | 清华大学 | Multi-blade collimator for tomotherapy and dynamic intensity modulated radiation therapy and control method of multileaf collimator |
| CN103272338A (en) * | 2013-05-20 | 2013-09-04 | 清华大学 | Radiotherapy equipment and radiotherapy system with radiotherapy equipment |
| CN103462624A (en) * | 2013-09-05 | 2013-12-25 | 中国科学院深圳先进技术研究院 | X-ray generator beam limiting device and blade driving device thereof |
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Application publication date: 20161026 |
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| RJ01 | Rejection of invention patent application after publication |