CN105608282A - Design method of ray filter - Google Patents
Design method of ray filter Download PDFInfo
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- CN105608282A CN105608282A CN201511031035.2A CN201511031035A CN105608282A CN 105608282 A CN105608282 A CN 105608282A CN 201511031035 A CN201511031035 A CN 201511031035A CN 105608282 A CN105608282 A CN 105608282A
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- filtering
- filter plate
- ray
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Abstract
The invention discloses a design method of a ray filter. The method rapidly simulates ray filtering through Monte Carlo software, reduces the design period, does not need to process a series of filters, and reduces the design cost; moreover, the method directly analyzes filtering effect through the Monte Carlo software, is easier to operate, and improves the evaluation accuracy of filtering effect.
Description
Technical field
The present invention relates to ray filter plate, be specifically related to a kind of ray filter plate method for designing.
Background technology
The X ray that is applied to the x-ray source generation of industry and medical field has a certain amount of Energy distribution,There is pleochroism. At medical field, low energy ray is little to the contribution of imaging, and can increase patient's suctionReceive metering; And at industrial circle, the pleochroism of ray can produce hardening effect, be lowered into image quality. And penetrateLine filter plate, can not affect under the prerequisite of imaging, reduces the content of low energy ray in X ray, reaches filterRipple effect.
At present, existing filter plate adopts experimental technique in the time of design, comprises the following steps:
A) selected filtering material, and be processed into a series of filter plates with different-thickness;
B) measure the filter effect of different filter plates in this series filter plate, measure ray by these filteringThe situation of sheet post dose and power spectrum;
C) filter effect is assessed, selected suitable filter plate.
This filter plate method for designing is measure when ray energy spectrum need be with special instrument, and this instrument costHeight, and be not easy to operation; Meanwhile, need to process a series of multiple filter plate, processing, measuring process is multipleAssorted, the process-cycle is long, causes the design cycle long; In addition, this method for designing is not to the assessment of filter effectAccurately enough.
Summary of the invention
In view of this, the object of the invention is to optimize the method for designing of ray filter plate, a kind of ray is providedFilter plate method for designing, to shorten the design cycle, reduce design cost, reduce operation easier, to improve filteringThe accuracy of recruitment evaluation.
For achieving the above object, the invention provides following technical scheme:
A kind of ray filter plate method for designing, comprises the following steps:
1) utilize Monte Carlo software to calculate the roentgen dose X D of radiographic source in measuring position1And spectral distributionΨ1(E)；
2) utilize Monte Carlo software to set filtering condition;
3) utilize Monte Carlo software to set filtering material and thickness parameter;
4) set up model, and utilize the roentgen dose X D after Monte Carlo software calculation of filtered2And spectral distributionΨ2(E)；
5) utilize Monte Carlo software analytical procedure 4) in the roentgen dose X D that obtains2With spectral distribution Ψ2(E) beNoly meet step 2) in the filtering condition set, if meet, filter plate design, if do not meet, adjustmentFilter plate material and thickness parameter, repeating step 3), 4), 5), until meet filtering condition.
Further, step 5) complete after, according to step 5) the result processing filter plate of analog computation, go forward side by sideRow actual measurement, does not need filter plate structure to modify if actual measured results meets filtering requirements; IfDo not meet filtering requirements and adjust filter plate thickness, until actual measurement meets filtering requirements.
Further, described filtering condition is complete filtering, after filtering after ray filtering ray energy lower than a1keVComponent be 0, after filtering, ray accumulated dose meets D with the ratio of filtering predose2/D1> η, wherein, a1KeV isThe filtering energy limit value of setting, η is the D setting2/D1Ratio boundary.
Further, described filtering condition is part filtering, and after filtering, ray energy is at a1keV～a2Within the scope of keVThe component percentage that accounts for total amount be less than b%, after filtering, ray accumulated dose meets with the ratio of filtering predoseD2/D1> η, wherein, a1keV～a2KeV is the energy limit scope of filtering, and b% is ray after the filtering of settingEnergy is at a1keV～a2Accounting boundary value within the scope of keV, η is the D setting2/D1Ratio boundary.
Further, described Monte Carlo software is the software of writing based on DSMC.
Further again, described Monte Carlo software is Geant4 or EGS.
Further, described filtering material is metal material or alloy material.
Further again, described metal material is copper or aluminium or stainless steel.
Further, step 5) in while adjusting filter plate thickness, ensure to meet the bar of complete filtering or part filteringUnder part, choose the ratio D of ray accumulated dose and filtering predose after filtering2/D1Thickness when maximum.
Beneficial effect of the present invention is:
A kind of ray filter plate method for designing of the present invention is utilized the filtering of Monte Carlo software Fast simulation ray,Shorten the design cycle, and without a series of multiple filter plates of processing, reduced design cost; In addition,Utilize this Monte Carlo software Direct Analysis filter effect, be easier to operation, and improved filter effect is commentedThe accuracy of estimating.
Brief description of the drawings
In order to make object of the present invention, technical scheme and beneficial effect clearer, the invention provides attached as followsFigure describes:
Fig. 1 is existing filter plate method for designing;
Fig. 2 is the steps flow chart schematic diagram of a kind of ray filter plate method for designing of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
A kind of ray filter plate method for designing, comprises the following steps:
1) utilize Monte Carlo software to calculate the roentgen dose X D of radiographic source in measuring position1And spectral distribution Ψ1(E)；
2) utilize Monte Carlo software to set filtering condition;
3) utilize Monte Carlo software to set filtering material and thickness parameter;
4) set up model, and utilize the roentgen dose X D after Monte Carlo software calculation of filtered2And spectral distributionΨ2(E)；
5) utilize Monte Carlo software analytical procedure 4) in the roentgen dose X D that obtains2With spectral distribution Ψ2(E) beNoly meet step 2) in the filtering condition set, if meet, filter plate design, if do not meet, adjustmentFilter plate material and thickness parameter, repeating step 3), 4), 5), until meet filtering condition.
In the present embodiment, described Monte Carlo software is the software of writing based on DSMC. Concrete,This Monte Carlo software is Geant4 or EGS.
In the present embodiment, described filtering material is metal material or alloy material. Concrete, described metal materialMaterial is copper or aluminium or stainless steel. This metal material or alloy material have good filter effect.
In the present embodiment, described filtering condition is complete filtering, and after filtering, after ray filtering, ray energy is lowIn a1The component of keV is 0, and after filtering, ray accumulated dose meets D with the ratio of filtering predose2/D1> η. Certainly,Described filtering condition also can be part filtering, and after filtering, ray energy is at a1keV～a2Component within the scope of keV accounts forThe percentage of total amount is less than b%, and after filtering, ray accumulated dose meets D with the ratio of filtering predose2/D1> η. ?In specific implementation process, filtering condition can be set according to the actual requirements. Wherein, a1KeV is the filter of settingWave energy boundary value, a1keV～a2KeV is the energy limit scope of filtering, and after filtering, ray energy existsa1keV～a2The percentage that component within the scope of keV accounts for total amount is less than b%, and η is the D setting2/D1Ratio circleLimit.
A kind of ray filter plate method for designing of the present invention is utilized the filtering of Monte Carlo software Fast simulation ray,Shorten the design cycle, and without a series of multiple filter plates of processing, reduced design cost; In addition,Utilize this Monte Carlo software Direct Analysis filter effect, be easier to operation, and improved filter effect is commentedThe accuracy of estimating.
As the improvement of such scheme, step 5) complete after, according to step 5) processing of the result of analog computationFilter plate, and carry out actual measurement, if meeting filtering requirements, actual measured results do not need filter plate structureModify; Adjust filter plate thickness if do not meet filtering requirements, until actual measurement meets filtering requirements.In the present embodiment, utilize actual measurement, further verify filter effect, the filtering that can improve filter plate is reliableProperty.
As the improvement of such scheme, step 5) in while adjusting filter plate thickness, ensure to meet complete filtering orUnder the condition of part filtering, choose the ratio D of ray accumulated dose and filtering predose after filtering2/D1Thick when maximumDegree, now, this thickness is optimum thickness, filter plate filter effect the best of this thickness.
Finally explanation, above preferred embodiment is only unrestricted in order to technical scheme of the present invention to be described,Although the present invention is described in detail by above preferred embodiment, those skilled in the artShould be appreciated that and can make various changes to it in the form and details, and do not depart from the present inventionClaims limited range.
Claims (9)
1. a ray filter plate method for designing, is characterized in that comprising the following steps:
1) utilize Monte Carlo software to calculate the roentgen dose X D of radiographic source in measuring position1And spectral distributionΨ1(E)；
2) utilize Monte Carlo software to set filtering condition;
3) utilize Monte Carlo software to set filtering material and thickness parameter;
4) set up model, and utilize the roentgen dose X D after Monte Carlo software calculation of filtered2And spectral distributionΨ2(E)；
5) utilize Monte Carlo software analytical procedure 4) in the roentgen dose X D that obtains2With spectral distribution Ψ2(E) beNoly meet step 2) in the filtering condition set, if meet, filter plate design, if do not meet, adjustmentFilter plate material and thickness parameter, repeating step 3), 4), 5), until meet filtering condition.
2. a kind of ray filter plate method for designing according to claim 1, is characterized in that: step 5)After completing, according to step 5) result of analog computation processing filter plate, and carry out actual measurement, survey if actualAmount result meets filtering requirements does not need filter plate structure to modify; If not meeting filtering requirements adjustsFilter plate thickness, until actual measurement meets filtering requirements.
3. the method for designing of a kind of ray filter plate according to claim 1, is characterized in that: described filterRipple condition is complete filtering, after filtering after ray filtering ray energy lower than a1The component of keV is 0, after filteringRay accumulated dose meets D with the ratio of filtering predose2/D1> η, wherein, a1KeV is filtering energy circle of settingLimit value, η is the D setting2/D1Ratio boundary.
4. a kind of ray filter plate method for designing according to claim 1, is characterized in that: described filteringCondition is part filtering, and after filtering, ray energy is at a1keV～a2Component within the scope of keV accounts for the percentage of total amountBe less than b%, after filtering, ray accumulated dose meets D with the ratio of filtering predose2/D1> η, wherein, a1keV～a2keVFor the energy limit scope of filtering, b% be set filtering after ray energy at a1keV～a2Accounting within the scope of keVThan boundary value, η is the D setting2/D1Ratio boundary.
5. a kind of ray filter plate method for designing according to claim 1, is characterized in that: its feature existsIn: described Monte Carlo software is the software of writing based on DSMC.
6. a kind of ray filter plate method for designing according to claim 5, is characterized in that: described illiteracy is specialCaro software is Geant4 or EGS.
7. a kind of ray filter plate method for designing according to claim 1, is characterized in that: described filteringMaterial is metal material or alloy material.
8. a kind of ray filter plate method for designing according to claim 7, is characterized in that: described metalMaterial is copper or aluminium or stainless steel.
9. a kind of ray filter plate method for designing according to claim 1, is characterized in that: step 5)When middle adjustment filter plate thickness, ensure to meet under the condition of complete filtering or part filtering, penetrate after choosing filteringThe ratio D of line accumulated dose and filtering predose2/D1Thickness when maximum.
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| CN201511031035.2A CN105608282B (en) | 2015-12-31 | 2015-12-31 | A kind of ray filtration design method |
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| CN201511031035.2A CN105608282B (en) | 2015-12-31 | 2015-12-31 | A kind of ray filtration design method |
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| CN105608282B CN105608282B (en) | 2018-09-11 |
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Citations (5)
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| WO2007046306A1 (en) * | 2005-10-19 | 2007-04-26 | Nippon Electric Glass Co., Ltd. | Radiation shielding glass and method for manufacture thereof |
| US20070121779A1 (en) * | 2005-10-07 | 2007-05-31 | Akihiko Nishide | Image reconstructing method and x-ray ct apparatus |
| CN103349555A (en) * | 2013-04-27 | 2013-10-16 | 中国人民解放军北京军区总医院 | X ray filtration device, X ray filtration system and mobile CT scanner |
| CN104318972A (en) * | 2014-10-29 | 2015-01-28 | 重庆真测科技股份有限公司 | Design method of X-ray flattening filter |
| CN204536229U (en) * | 2014-12-31 | 2015-08-05 | 同方威视技术股份有限公司 | A kind of filter and a kind of substance detecting device |
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2015
- 2015-12-31 CN CN201511031035.2A patent/CN105608282B/en active Active
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| US20070121779A1 (en) * | 2005-10-07 | 2007-05-31 | Akihiko Nishide | Image reconstructing method and x-ray ct apparatus |
| WO2007046306A1 (en) * | 2005-10-19 | 2007-04-26 | Nippon Electric Glass Co., Ltd. | Radiation shielding glass and method for manufacture thereof |
| CN103349555A (en) * | 2013-04-27 | 2013-10-16 | 中国人民解放军北京军区总医院 | X ray filtration device, X ray filtration system and mobile CT scanner |
| CN104318972A (en) * | 2014-10-29 | 2015-01-28 | 重庆真测科技股份有限公司 | Design method of X-ray flattening filter |
| CN204536229U (en) * | 2014-12-31 | 2015-08-05 | 同方威视技术股份有限公司 | A kind of filter and a kind of substance detecting device |
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| 代志力 等: "一种基于NP设计X射线均整片的方法", 《全国射线数字成像与CT新技术》 * |
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Denomination of invention: A Design Method for Ray Filters Effective date of registration: 20230605 Granted publication date: 20180911 Pledgee: Chongqing Bank Co.,Ltd. Major Branch Pledgor: CHONGQING ZHENCE SCIENCE AND TECHNOLOGY Co.,Ltd. Registration number: Y2023500000039 |
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