CN2675166Y - Outlay type electric poly-leaf grating with dose monitoring function - Google Patents
Outlay type electric poly-leaf grating with dose monitoring function Download PDFInfo
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- CN2675166Y CN2675166Y CN 200420032731 CN200420032731U CN2675166Y CN 2675166 Y CN2675166 Y CN 2675166Y CN 200420032731 CN200420032731 CN 200420032731 CN 200420032731 U CN200420032731 U CN 200420032731U CN 2675166 Y CN2675166 Y CN 2675166Y
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- sensing head
- leaf
- optical grating
- leaf grating
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Abstract
The utility model relates to an outlay type electric poly-leaf grating with dose monitoring function which belongs to the manufacturing field of intelligent poly-leaf collimating devices. The utility model mainly comprises an electric poly-leaf grating and a micro computer controller. A beam dose sensing head is installed in the coverage field of the incidence end of the electric poly-leaf grating. The signal of the sensing head is transported to the micro computer controller. The outcoming signal of the micro computer controller are conveyed to the electric poly-leaf grating and are implemented a closed-loop control. The utility model can adjust automatically the velocity of movement of the leaf according to the dose rate of a linear accelerator in order to guarantee the accuracy of the dose needed in the radiotheraphy.
Description
One, technical field
This utility model relates to the medical apparatus and instruments that is used for radiotherapy, the multi-diaphragm collimator manufacturing field that concrete table is said so and had dosage monitoring function.
Two, background technology
Multi-leaf optical grating is that multi-diaphragm collimator is a kind of medical apparatus and instruments that is used for the radiation treatment tumor, and it determines the coverage field of radiotherapy by constituting appropriate intervals between the grating blade of the left and right sides to realize suitable shape limit bundle, and the motion of left and right sides grating blade is realized by the numerical control electric device.In the actual clinical intensity modulated therapy, because the linear accelerator close rate that is used with multi-leaf optical grating (ray is the circulation by the unit field area in the unit interval) is less stable often, sometimes even mutually far short of what is expected, can not reach the accuracy requirement of treatment aspect to exposure dose with required value.
Satisfy the requirement of exposure dose accuracy in the existing treatment, the one, improve existing linear accelerator, make its close rate remain on the perfect condition of stable and average, difficulty is higher technically for this, the manufacturing cost height, present stage is difficult to commercialization; The 2nd, starting with aspect the existing multi-leaf optical grating of improvement.And the design of existing multi-leaf optical grating generally focuses on the accuracy aspect that blade is shaped and (realizes blade shaping accuracy problem as CN1413746 " forming detection method of multi-blade collimator and multi-blade collimator " by the blade displacement monitoring device is set; And for example CN2523447 " the pitch error aligning gear of multi-diaphragm collimator " controls by the photoelectric sensing signal and adjusts blade shaping accuracy, to get rid of the error that the collimator screw pitch causes in making or using).Under the unsettled prerequisite of existing linear accelerator close rate, the technical measures that " blade be shaped accurately " only arranged are can not reach the treatment aspect far away to the requirement of irradiation dosage accuracy.
Three, utility model content
The purpose of this utility model provides a kind of external electric multiblade optical grating with dosage monitoring function, under the unsettled situation of roentgendosis rate, reaches the accuracy requirement of treatment to exposure dose.This novel purpose is achieved in that a kind of external electric multiblade optical grating with dosage monitoring function, comprise electric multiblade optical grating, microcomputer controller, also has the roentgendosis sensing head in the coverage field that is arranged on electric multiblade optical grating incident end, the signal of this sensing head is delivered to microcomputer controller, the output signal of microcomputer controller is sent to electric multiblade optical grating, implements closed loop control.
In the above-mentioned design, adopt microcomputer controller.Microcomputer controller and roentgendosis sensing head are formed automatic control system, the signal of this sensing head is delivered to microcomputer controller, the output signal of microcomputer controller is passed to the control device of electric multiblade optical grating, sensing head this physical signalling of close rate that each is instantaneous is converted to the signal of telecommunication and is input to microcomputer controller, the standard dose rate (the determined specified radiotherapy time of specified close rate of treatment required dosage ÷ linear accelerator) that goes out with calculated in advance in the micro computer compares, and with the output of the difference signal of actual dose rate and standard dose rate, to adjust the folding time of staying of Motor Control vane type grating.If this difference signal Δ is timing, then shorten radiotherapy irradiation time (being the vane type grating opening time), when being negative, then prolong radiotherapy irradiation time (being the vane type grating opening time) as if the difference signal Δ, if the difference signal Δ is 0 o'clock, then carries out radiotherapy on schedule and get final product.Like this, in the intensity modulated therapy process, this novel variation that can monitor the close rate of linear accelerator at any time, and control the relative position and the time of staying of two blades in real time, change and the error of generation to compensate out close rate, thereby, even under the unsettled prerequisite of linear accelerator roentgendosis rate, also can pass through the timing monitoring means, reach the accuracy of radiotherapy required dosage.
Four, description of drawings
Accompanying drawing is this novel vertical view.
Five, the specific embodiment
In the accompanying drawing, the existing external electric multiblade light coral 1 of this novel employing, its left part blade 2a and right part blade 2 can move back and forth along the direction of arrow, gap between the left and right blade constitutes the radiotherapy coverage field, and the anterior coverage field of blade position is provided with dose sensor support 4, and this roentgendosis sensing head can adopt semiconductor sensing head (buyable), sensing head is a plurality of (more than 3 and 3), preferably select 5 for use, one of them is positioned at coverage field middle part, all the other 4 can be arranged on around.In the intensity modulated therapy process, the close rate that by radioactive source 3 is the ray of linear accelerator is detected by the roentgendosis sensing head in good time, and its corresponding signal of telecommunication inputed among the microcomputer controller, microcomputer controller compares this input signal and standard signal, its difference is passed to electric multiblade optical grating as an output signal, adjust the movement velocity of two blades of control multi-leaf optical grating, to guarantee the accuracy of radiotherapy required dosage.
Claims (5)
1, a kind of external electric multiblade optical grating with dosage monitoring function, comprise electric multiblade optical grating, microcomputer controller, it is characterized in that, also has the roentgendosis sensing head in the coverage field that is arranged on electric multiblade optical grating (1) incident end, the signal of this sensing head is delivered to microcomputer controller, and the output signal of microcomputer controller is sent to electric multiblade optical grating.
2, multi-leaf optical grating according to claim 1 is characterized in that, described roentgendosis sensing head is arranged on the support (4).
3, multi-leaf optical grating according to claim 1 and 2 is characterized in that, described roentgendosis sensing head is a plurality of.
4, multi-leaf optical grating according to claim 3 is characterized in that, described roentgendosis sensing head is 5, and one of them is positioned at the coverage field middle part.
5, multi-leaf optical grating according to claim 3 is characterized in that, described roentgendosis sensing head is the semiconductor sensing head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420032731 CN2675166Y (en) | 2004-02-05 | 2004-02-05 | Outlay type electric poly-leaf grating with dose monitoring function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420032731 CN2675166Y (en) | 2004-02-05 | 2004-02-05 | Outlay type electric poly-leaf grating with dose monitoring function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2675166Y true CN2675166Y (en) | 2005-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420032731 Expired - Fee Related CN2675166Y (en) | 2004-02-05 | 2004-02-05 | Outlay type electric poly-leaf grating with dose monitoring function |
Country Status (1)
| Country | Link |
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| CN (1) | CN2675166Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111773558A (en) * | 2020-07-01 | 2020-10-16 | 苏州雷泰医疗科技有限公司 | Method and device for using grating to servo dosage rate and radiotherapy equipment |
-
2004
- 2004-02-05 CN CN 200420032731 patent/CN2675166Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111773558A (en) * | 2020-07-01 | 2020-10-16 | 苏州雷泰医疗科技有限公司 | Method and device for using grating to servo dosage rate and radiotherapy equipment |
| WO2022000963A1 (en) * | 2020-07-01 | 2022-01-06 | 苏州雷泰医疗科技有限公司 | Method and apparatus for using grating to perform servo control over dose rate, and radiotherapy device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |