CN102525492A - Device for selecting X-ray energy spectrum - Google Patents
Device for selecting X-ray energy spectrum Download PDFInfo
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- CN102525492A CN102525492A CN2010106157639A CN201010615763A CN102525492A CN 102525492 A CN102525492 A CN 102525492A CN 2010106157639 A CN2010106157639 A CN 2010106157639A CN 201010615763 A CN201010615763 A CN 201010615763A CN 102525492 A CN102525492 A CN 102525492A
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- ray
- reflectance coating
- filter lens
- coating filter
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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
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/4035—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter or grating
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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
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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
- A61B6/48—Diagnostic techniques
- A61B6/482—Diagnostic techniques involving multiple energy imaging
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
- G21K1/067—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators using surface reflection, e.g. grazing incidence mirrors, gratings
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K2201/00—Arrangements for handling radiation or particles
- G21K2201/06—Arrangements for handling radiation or particles using diffractive, refractive or reflecting elements
- G21K2201/062—Arrangements for handling radiation or particles using diffractive, refractive or reflecting elements the element being a crystal
Abstract
The invention relates to the field of medical imaging, in particular to a device for selecting an X-ray energy spectrum. The device comprises an X-ray tube and a reflective film light filter, wherein the reflective film light filter is arranged to ensure that an included angle is formed between the surface of the reflective film light filter and the propagation direction of an X-ray beam emitted by the X-ray tube to reflect an X-ray of a preset energy band, so that energy spectrum selection of the X-ray beam is realized, and a novel imaging mode and a novel application extension field are provided for the imaging of X rays when the signal-to-noise ratio is improved.
Description
Technical field
The present invention relates to the medical imaging field, relate in particular to a kind of X-ray energy spectrum selecting arrangement.
Background technology
In the x-ray imaging field, people hope in existing x-ray dose scope, further to reduce the x-ray dose that human body receives, with the radiation of further minimizing X ray to human body.Because the X ray that X-ray tube sends has successive wide power spectrum; For example be distributed in 1～150keV; Wherein low energy X ray (, and can be attenuated this has just caused absorption of human body useless X ray as 1～10keV) nonsensical to last imaging results when passing the histoorgan of human body.In order to reduce the radiation of low energy X ray to human body; Present common way is on the x-ray spread direction, to arrange some thin layers that are made up of attenuating material (hereinafter to be referred as damping layer); These attenuating materials for example are metal (like copper, aluminum) or nonmetal material (like graphite, politef), before X ray arrives human body, low energy X ray is attenuated.Though change has taken place in the X-ray energy spectrum through after the damping layer decay, but still has successive wide power spectrum, 10～150keV for example, as far as present x-ray imaging technology, the power spectrum of X ray is wide more, and signal to noise ratio is poor more; The X ray of wide power spectrum also can influence further developing of x-ray imaging method simultaneously.
In X-ray energy spectrum imaging (like the dual intensity imaging); X ray with a series of different-energies shines object to be checked; Obtaining the different manifestations of object to be checked on the histology, when limiter tube voltage was 70keV in the imaging of X ray dual intensity, it was 0～70keV that the X ray that obtains can be with; When limiter tube voltage is 140keV; It is 0～140keV that the X ray that obtains can be with; So it is overlapping that the X ray under two kinds of tube voltages can have, this overlapping in order to reduce, the X ray of selectively masking different-energy when needing a kind of power spectrum selector of design to apply different tube voltages to be implemented in.But in the prior art, can only reduce this overlappingly, and can't the X ray under two kinds of tube voltages be separated fully.The X ray that carries out after power spectrum is selected through the power spectrum selector in addition still has the power spectrum of broad, and signal to noise ratio is relatively poor, causes the application of power spectrum imaging to be difficult to expansion.
In addition; For some emerging x-ray imaging technology (for example phase contrast imaging); The monoenergetic X ray is an important foundation; Mainly under breadboard specified conditions, obtain this monoenergetic X ray through synchrotron radiation at present, because this monoenergetic X ray under household condition can't obtain, commercialization is difficulty very.
In addition, present x-ray imaging technical concerns is at the x-ray imaging (as through power spectrum and photon counting) of expanded function rather than the x-ray imaging on the anatomy, thus change x-ray imaging pattern.
Granted publication is number for the patent of CN100373184C discloses a kind of cut-off bandwidth dual pathways bandpass filter, and the bypass belt that it can suppress the transmission peaks two ends well has high peak value percent of pass simultaneously.But this optical filter is that visible light is carried out filtering, selects and can't carry out power spectrum far above the X ray of visible light to energy; And this patent is to be used for optical detector and field of space technology, rather than the x-ray imaging field.
Summary of the invention
For overcoming the defective of the above-mentioned prior art of mentioning; The present invention proposes a kind of X-ray energy spectrum selecting arrangement; Select X ray is carried out power spectrum; Promptly under the situation that does not change original X-ray energy spectrum, from original X-ray spectrum, obtain the predetermined X ray that can be with through this power spectrum selecting arrangement, thereby new imaging mode and new application extension field are provided for x-ray imaging.
In view of this; The present invention provides a kind of X-ray energy spectrum selecting arrangement; Said device comprises a kind of X-ray tube, also comprises a kind of reflectance coating filter lens, wherein; Said reflectance coating filter lens makes through layout between the direction of propagation of the X-ray beam that its surface sends with said X-ray tube and has an angle, so that the X ray of being scheduled to be with is reflected.
According to one embodiment of present invention, saidly predeterminedly can comprise being with of an above keV magnitude by band.
According to another embodiment of the invention, said predetermined can being with comprise that an above 10keV～150keV is with interior being with.
According to another embodiment of the invention, said can band be separated from one another.
Further, said device comprises the above reflectance coating filter lens, and these reflectance coating filter lenss are parallel.
According to one embodiment of present invention, said reflectance coating filter lens comprises that plural number plants material.
According to one embodiment of present invention, said reflectance coating filter lens comprises the plural layer reflectance coating.
Wherein, the bed thickness of each layer reflectance coating is the nm magnitude.
The bed thickness of said each layer reflectance coating can be provided with according to following bragg's formula: 2d sin θ=λ, and wherein, d representes the bed thickness of said each layer reflectance coating, and θ representes said angle, and λ representes the wavelength of the said predetermined X ray that can be with.
According to one embodiment of present invention, said plural layer reflectance coating comprises the reflective coating that is made up of the W material and by B
4The reflective coating that the C material constitutes, these two kinds of reflective coating arranged alternate.
According to one embodiment of present invention, the bed thickness of the said reflective coating that is made up of the W material is 1nm, and is said by B
4The bed thickness of the reflective coating that the C material constitutes is 1.5nm.
Preferably, said angle is 0.2 degree～2 degree.
From such scheme, can find out; Because the present invention provides a kind of X-ray energy spectrum selecting arrangement; It adopts the power spectrum selector of a kind of reflectance coating filter lens as X ray; Through reflecting realization the power spectrum of original X ray (being the X-ray beam that X-ray tube sends) is selected, obtaining the predetermined X ray that can be with, thereby new imaging mode and new application extension field are provided for x-ray imaging.Simultaneously, compare with the damping layer of prior art, the X ray that the present invention produces can be with narrower, or even narrow ability band approximate monoenergetic, the keV magnitude, when improving signal to noise ratio, has further reduced the x-ray dose that object to be checked receives.And, compare with existing X-ray energy spectrum imaging technique, a plurality of X ray that the present invention produces can be with can be separated from one another, do not have eclipsedly, help analysis image and raising image quality.In addition, device of the present invention can be produced in batches, helps commercialization.In addition; The present invention also adopts a plurality of reflectance coating filter lenss that incident X-rays is carried out plural secondary reflection; Do not changing the incident X-rays direction of propagation and need not under the situation that the relative origin-location of X-ray tube rotates; Obtain the predetermined X ray that can be with, be easy to realize based on present x-ray imaging equipment.
Description of drawings
Fig. 1 selects the comparative result sketch map that obtains for the damping layer with power spectrum selecting arrangement of the present invention and prior art carries out power spectrum to original X ray respectively.
Fig. 2 can be with the reflectance sketch map of X ray to difference for reflectance coating filter lens shown in Figure 1.
Fig. 3 selects for reflectance coating filter lens of the present invention original X ray being carried out power spectrum, obtains being similar to the X ray of monoenergetic, and the sketch map as a result that compares with the X ray of full width at half maximum 1keV.
Fig. 4 is for carrying out power spectrum selection with reflectance coating filter lens of the present invention to original X ray, obtain two isolating narrow can be with the sketch map of X ray.
Fig. 5 is for to reflect original X ray with a reflectance coating filter lens of the present invention, with the geometrical light-path sketch map of realizing that power spectrum is selected.
Fig. 6 is for to reflect original X ray with two reflectance coating filter lenss of the present invention, with the geometrical light-path sketch map of realizing that power spectrum is selected.
The specific embodiment
For making the object of the invention, technical scheme and advantage clearer, below lift embodiment and combine accompanying drawing further explain of the present invention.
The present invention provides a kind of power spectrum selecting arrangement that is different from damping layer, and it adopts a kind of reflectance coating filter lens rather than attenuating material, realizes the power spectrum of original X ray is selected through reflecting the predetermined X ray that can be with.
X-ray energy spectrum selecting arrangement of the present invention comprises a kind of X-ray tube and a kind of reflectance coating filter lens.This reflectance coating filter lens comprises plural number kind material.According to one embodiment of present invention, this reflectance coating filter lens comprises the plural layer reflectance coating that is plated on the one surface, the reflective coating that for example is made up of the W material and by B
4The reflective coating that the C material constitutes, the bed thickness of the reflective coating that wherein is made up of the W material is 1nm, by B
4The bed thickness of the reflective coating that the C material constitutes is 1.5nm, and these two kinds of reflective coating arranged alternate are formed one dimension artificial intraocular lenses structure, and periodicity is 150, so the structure of this reflectance coating filter lens is: [W (1.0nm)/B
4C (1.5nm)]
150Wherein, said one dimension artificial intraocular lenses can form coherent reflection by band to the specific of incident X-rays, thereby obtains high reflectance, here specific can with predetermined among the present invention just can band.So can select different reflectance coating filter lenss according to predetermined can the bringing of different X ray, for example obtain different reflectance coating filter lenss through material, bed thickness and the periodicity of selecting to constitute reflectance coating.
Reflectance coating filter lens of the present invention can be produced in batches through the Special Equipment of making reflectance coating.When this reflectance coating filter lens of preparation, can adopt magnetron sputtering technology in the ultra-smooth substrate, to be coated with the plural layer reflectance coating.Substrate surface must ultra-smooth, with effective minimizing because the coarse scattering that causes of substrate surface.After substrate is cleaned, put into the magnetron sputtering coater device to substrate, evacuate air is until reaching ultrahigh vacuum, and charge into sputter gas this moment again, alternately is coated with W reflective coating and B
4The C reflective coating.In addition, also can be coated with reflective coating with other materials.[W (1.0nm)/B but of the present invention
4C (1.5nm)]
150To (10～150keV) X-ray energy spectrum selects effect better in the x-ray imaging scope.
In addition; The reflectance coating filter lens can be designed as the bimodal reflectance coating filter lens that can obtain two ability bands through a power spectrum selection; Or the unimodal reflectance coating filter lens of an ability band; Or three with last multimodal reflectance coating filter lenss that can band, unimodal can band, bimodal can band and the reflectance size of multimodal in being with can realize through different designs the reflectance coating filter lens, like the surperficial angle of choice reflective film material, reflectance coating bed thickness, periodicity and incident X-rays and reflectance coating etc.For example when angle be 1 when spending, the reflectance coating filter lens can reach more than 90% the X ray reflection rate of 40～60kev through design, then is below 20% to the X ray reflection rate of other energy; When angle is 1.1 when spending, the reflectance coating filter lens can reach the X ray reflection rate of 60～80kev more than 90%, and the X ray reflection rate of other energy then is below 20%.
Reflectance coating filter lens of the present invention can realize that it is Prague (Bragg) formula that power spectrum is selected the principle of institute's foundation: 2d sin θ=Δ l=λ through reflection; Wherein d is the bed thickness of reflectance coating; λ for the X ray wavelength that reflects through reflectance coating (promptly; The predetermined X ray wavelength that can be with), θ is the angle on incident X-rays and reflectance coating surface (or reflectance coating filter lens surface).Inciding the X ray that has only wavelength X in the original X ray on the reflectance coating filter lens could be by each layer reflectance coating reflection, is superimposed through the reflection of plural layer reflectance coating, just can obtain to be scheduled to the X ray that can be with.According to bragg's formula, if will reflect sigmatron, just need reduce the angle on incident X-rays and reflectance coating surface, perhaps reduce the bed thickness of reflectance coating.Angle is more little, and the required precision of angle is also high more, in the embodiments of the invention, according to selected predetermined can being with, usually angle is arranged on 0.2～2 degree, and this explanation X ray is incident along the low-angle of pressing close to reflectance coating filter lens reflecting surface.The bed thickness of reflectance coating can be calculated by predetermined peak value and the width gauge that can be with, and bed thickness is generally the nm level, generally is no more than 5nm.
As shown in table 1 below is that the reflectance coating filter lens is to the different reflectivity of the X ray of 50～80keV when adopting different angles.Adopt the reflectance coating filter lens to comprise 200 layers of reflectance coating in the table, the bed thickness of every tunic is 1.7nm.
Table 1
| The X ray energy | Angle | Reflectance |
| 50keV | θ＝0.423° | 76.78％ |
| 60keV | θ＝0.352° | 79.39％ |
| 80keV | θ＝0.264° | 67.75％ |
Visible in the table 1, the angle on incident X-rays and reflectance coating surface is more little, and the X ray energy that the membrane filtration that is reflected light microscopic reflects is high more.In addition, be different with a kind of reflectance coating to the reflectance of different-energy X ray.
Fig. 1 selects the comparative result sketch map that obtains for the damping layer with power spectrum selecting arrangement of the present invention and prior art carries out power spectrum to original X ray respectively.Three curves among Fig. 1 are respectively: what dotted line was represented is original X ray; That chain-dotted line is represented is the result who original X ray is decayed with the aluminum damping layer of 2.5mm, and what solid line was represented is that reflectance coating filter lens of the present invention carries out the result that power spectrum is selected to original X ray.Original X-ray energy spectrum is between 10～110keV, and this power spectrum mainly is to be determined by the anode material of X-ray tube and tube voltage.With the aluminum damping layer of the 2.5mm power spectrum after to original X ray decay between 20～110keV; Damping layer just attenuates the low energy X ray below the 20keV; X-ray energy spectrum is squinted to high-energy section to some extent, select but can't carry out power spectrum, the X ray after the decay is still wide power spectrum.And with reflectance coating filter lens of the present invention original X ray is carried out after power spectrum selects; The X ray that obtains can be with and obviously be limited in the specified narrower zone (according to appointment between 40～83keV); X ray that is lower than 40keV and the X ray that is higher than 83keV are had well by effect simultaneously; It is thus clear that the transmitting film filter lens of the present invention's invention is compared damping layer and can be realized well the power spectrum of original X ray is selected, and the X ray that obtains can be with narrower.
Fig. 2 can be with the reflectance sketch map of X ray to difference for reflectance coating filter lens shown in Figure 1.Visible reflectance coating filter lens of the present invention has higher reflectance to the X ray of 40～83keV among Fig. 2, about 0.5～0.6, and X ray that is lower than 40keV and the X ray that is higher than 83keV is not reflected (reflectance is about 0.0) basically.So reflectance coating filter lens of the present invention has higher reflectance with regard to having realized to the predetermined X ray that can be with, and can suppress well the non-predetermined X ray that can be with.
In addition; According to bragg's formula; Under the fixed situation of reflectance coating filter lens (material, thickness and the number of plies that are reflectance coating are constant); Can come original X ray is reflected through the angle of regulating incident X-rays and reflectance coating surface, to obtain the different predetermined X ray that can be with, the X ray be with of narrower ability such as 20～30keV, 40～75keV, 80～100keV or 90～120keV for example.In the x-ray imaging technology, required X ray can be with and be generally 10～150keV, through different said angles is set, just can obtain 10～150keV with the interior various narrower X ray that can be with.
Because each layer reflectance coating of reflectance coating filter lens of the present invention all has very strong reflection to the X ray that incides on this layer reflectance coating; So just can carry out superpower reflection to the X ray of predetermined can being with (maybe can with window); And mask can be with X ray outside window at this; So just can realize the power spectrum of X ray is selected narrower can being with as shown in Figure 1 through this reflectance coating filter lens; Perhaps the narrow of keV magnitude can be with, even can be counted as the monoenergetic X ray, and be as shown in Figure 3; Perhaps have isolating dual intensity arrowband, as shown in Figure 4.And these narrower abilities are with, the narrow X ray that can be with need not change x-ray source and just can produce.
Fig. 3 selects for reflectance coating filter lens of the present invention original X ray being carried out power spectrum, obtains being similar to the X ray of monoenergetic, and the sketch map as a result that compares with the X ray of full width at half maximum 1keV.What represent with chain-dotted line among the figure is full width at half maximum 1keV (Full Width at Half Maximum, X ray FWHM), approximate monoenergetic (80keV).Here adopt FWHM to be because the curve of spectral distribution is not a square wave,, can only weigh the value of curve width with FWHM, with the broadening of more different spectral lines so there is not usually said width; What dot is original X ray; What represent with solid line is to select the X ray (79.5～80.5keV) of the approximate monoenergetic that obtains with the original X-ray energy spectrum that reflectance coating filter lens of the present invention is represented dotted line.Can find out among the figure that X ray that obtains with reflectance coating filter lens of the present invention and the X ray of FWHM 1keV are quite similar.Because this reflectance coating filter lens of the present invention can be produced in enormous quantities, therefore comparing prior art obtains the monoenergetic X ray through synchrotron radiation, is easier to commercialization and batch process.
Fig. 4 selects for reflectance coating filter lens of the present invention original X ray being carried out power spectrum, obtain two isolating narrow can be with the sketch map of X ray (being bimodal can being with).Two narrow can being with can (be about 23～28keV and 59～61keV) non-overlapping copies by X ray among the figure; And reflectance is all about 0.85; And two see through the rejection zone that the two ends, peak have broad again among the figure; Ended effectively and can be with the X ray that is about about 28～57keV, these two the narrow X ray of being with all are the keV magnitude.Moreover, filter lens of the present invention also can produce as shown in Figure 4 narrow more than three can band (being that multimodal can be with), or X ray, or the X ray that narrower ability is with more than two as shown in Figure 1 of approximate monoenergetic more than two as shown in Figure 3.Compare the X ray dual intensity imaging results of prior art, through reflectance coating filter lens of the present invention carry out X ray after power spectrum is selected can be be separated from one another, do not have eclipsed.Not transmission from one meridian to another reflectance coating filter lens of the present invention carry out power spectrum predetermined after selecting can band also can be have eclipsed, specifically by reflectance coating that constitutes the reflectance coating filter lens and angle decision.In addition, the different reflectivity of Fig. 3 and Fig. 4 be by different predetermined can band and factor affecting such as angle.
Fig. 5 is for to reflect original X ray with a reflectance coating filter lens of the present invention, with the geometrical light-path sketch map of realizing that power spectrum is selected.The X-ray tube 1 that dotted line is represented among the figure is positioned at 4 places, position, and do not have reflectance coating filter lens between X-ray tube 1 and the detector 3 this moment, and the X-ray beam shown in the dotted line that X-ray tube 1 sends is received by detector 3.After having arranged a reflectance coating filter lens 2 between X-ray tube 1 and the detector 3; Since X-ray tube 1 send X-ray beam 6 the direction of propagation need and reflectance coating filter lens 2 between have an angle (acute angle); Therefore X-ray tube 1 moves to current position 5 from original position 4; Also need adjust the position of reflectance coating filter lens 2 simultaneously, 5 places in the position like this, just there is a suitable angle 12 in the X-ray beam 6 that X-ray tube 1 sends with the surface (the plural layer reflectance coating has been plated on this surface) of reflectance coating filter lens 2; Make original X-ray beam 6 after the reflection of reflectance coating filter lens 2; The predetermined X ray 7 that can be with can be reflected with very high reflectance, and by detector 3 receptions, other can with the X ray membrane filtration light microscopic 2 that then is reflected mask; Here detector 3 along with moving of X-ray tube 1, and its position does not change.Wherein angle 12 can calculate according to the predetermined X ray wavelength that can be with and according to bragg's formula.In addition, need calculate the size of reflectance coating filter lens 2, make the surface of reflectance coating filter lens 2 can receive whole X-ray beams 6 at least, be unlikely to too big again and the waste reflective film material according to the angle of taper of X-ray beam 6.
But in Fig. 5; Translation has not only taken place but also rotation has taken place with respect to original position 4 in the X-ray tube 1 at 5 places, position; But the position of detector 3 does not but change synchronously, so corresponding change will take place the geometry arrangement mode of X-ray tube and detector, because X-ray tube and detector all are CT (X ray computer fault imagings; Computed Tomography) vitals of frame; So this change can influence whole shelf design, bring difficulty both for the existing frame design of improvement, can improve the cost of frame design again.If but translation takes place in 4 original relatively of positions of X-ray tube 1, and does not rotate, and is just relatively easy in the frame design so, other assemblies are taken place than about-face.
Preferably adopt two parallel reflectance coating filter lenss based on this present invention; Can certainly adopt reflectance coating filter lens parallel more than three; Only need make X-ray tube 1 relative origin-location 4 that translations take place just to make that be scheduled to can be with X ray 7 by the purpose of detector 3 receptions to reach through incident X-rays being carried out more than twice or three times reflection; Simultaneously also kept constant with the direction of propagation of original X ray, as shown in Figure 6.
Fig. 6 is for to reflect original X ray with two reflectance coating filter lenss of the present invention, with the geometrical relationship sketch map of realizing that power spectrum is selected.Here with two the reflectance coating filter lenss difference called after first reflectance coating filter lenss 21 and the second reflectance coating filter lens 22.Illustrate three X-ray tubes 1 among Fig. 6, wherein be positioned at 4 places, position and position 5 place's X-ray tubes 1 all dot.When not having reflectance coating filter lens 21 and 22 between position 4 and detector 3, be positioned at the X-ray beam shown in the dotted line that the X-ray tube 1 at 4 places, origin-location sends and received by detector 3.When having only a reflectance coating filter lens 22 between position 5 and the detector 3; X-ray tube 1 need be from the home position 4 could in-position 5 through translations and rotation; Make after X ray (being the reverse extending line of the X ray 10) membrane filtration that is reflected light microscopic 22 reflections that position 5 place's X-ray tubes 1 send, received by detector 3.But after having arranged two reflectance coating filter lenss 21 and 22 between X-ray tube 1 and the detector 3; X-ray tube 1 just only needs to move to current position 8 from original position 4; Adjust the position of two reflectance coating filter lenss simultaneously, make the first reflectance coating filter lens 21 parallel with the second reflectance coating filter lens 22, the X-ray beam 6 that sends of X-ray tube 1 is at first by 21 reflections of the first reflectance coating filter lens like this; Obtain the predetermined X ray 10 that can be with; Then this predetermined X ray 10 that can be with by 22 reflections of the second reflectance coating filter lens, obtains the predetermined X ray 7 that can be with, and is received by detector 3 again; Here X ray 10 is identical with being with of X ray 7, and detector 3 is the not translation along with the translation of X-ray tube 1 also.So; Reflection through two reflectance coating filter lenss 21 and 22; The X-ray beam 6 that 8 place's X-ray tubes 1 send in the position is received by detector 3; And make that the direction of propagation of X-ray beam 6 is parallel with the direction of propagation of the predetermined X ray 7 that can be with, keep the constant purpose of original x-ray spread direction thereby reach.
According to bragg's formula; Can be through changing original X ray reaches the different X ray that can be with of reflection to the angle of reflectance coating filter lens purpose; And angle can reach through the position of adjustment X-ray tube; As shown in Figure 6, X-ray tube 1 moves to position 8 from original position 4, and visible among the figure X-ray tube 1 relative origin-location 4 at 8 places has taken place to make progress and translation to the right in the position; This translation can realize through following mode: because the translation distance translation distance more to the right that makes progress is big; So the translation that makes progress can realize through the translation of X-ray tube 1, therefore in the frame design, should make X-ray tube 1 can carry out the translation of this centimetre of magnitude distance; Then can realize that this translation is generally a millimeter magnitude through the focus generation translation that makes the X-ray tube 1 after the upwards translation in the horizontal direction, because the target surface of X-ray tube is limited, this also can realizing to right translation by X-ray tube certainly.
In addition; The position 4 and the position 5 of X-ray tube are centrosymmetric about position 8; Position 5 and position 8 are centrosymmetric about the planar line 13 of reflectance coating filter lens 21 simultaneously; Reason is the angle, X ray 10 of planar line 13 and the planar line 14 of angle, X-ray beam 6 and the second reflectance coating filter lens 22 of the reverse extending line of X ray 10 and the angle of the reverse extending line of angle, planar line 14 and the X ray 7 of planar line 14, all equals the size of angle 11.These two reflectance coating filter lenss 21 and some parameters of 22; For example size and position; Can utilize the similar formula of triangle, under the situation of X-ray tube focus generation translation, calculate to the distance and the angle of the second reflectance coating filter lens according to focus, this focus of X-ray tube; Under the situation of only X-ray tube generation translation; Calculate to the distance and the angle 11 of the second reflectance coating filter lens position, this position according to X-ray tube; But this moment X-ray tube focus be translation along with the translation of X-ray tube; Therefore generally speaking, reflectance coating filter lens 21 and 22 position and arrangement are that focus, this focus according to X-ray tube calculated to the distance and the angle 11 of the second reflectance coating filter lens.For example; The position 4 of X-ray tube, position 8 and angle 11 are known; And the direction of propagation of the X-ray beam that 8 place's X-ray tubes send in the position is parallel with the exit direction of the X ray that reflects through the second reflectance coating filter lens; Because position 4 is centrosymmetric with position 5 about position 8, so just can obtain position 5, and position 5 is positioned on the reverse extending line of the incident X-rays that incides the second reflectance coating filter lens 22.Obtain the distance of the first reflectance coating filter lens 21 and position 8 according to the size of the distance of the position 8 and the second reflectance coating filter lens 22 and angle 11.According to the triangle correspondence theorem, 4 distance is 2 times of the first reflectance coating filter lens 21,8 distances to the position to the second reflectance coating filter lens 22 to the position, thereby obtains the particular location of the second reflectance coating filter lens 22.The basis X-ray beam that 8 place's X-ray tubes send in the position and the angle of the first reflectance coating filter lens are angle 11 again, thus the arrangement of the first reflectance coating filter lens 21.
It should be noted that; Because X ray 10 is identical with being with of X ray 7 among Fig. 6, all be the predetermined X ray that can be with, so reflecting incident X-rays 10,22 needs of the second reflectance coating filter lens get final product; Do not select and need not carry out power spectrum to incident X-rays through reflection; Therefore in order to practice thrift cost, the second reflectance coating filter lens 22 here also can not adopt the material and the structure of reflectance coating filter lens of the present invention, as long as can carry out all or the great majority reflection incident X-rays.In addition; Reflectance coating filter lens of the present invention can also be as a kind of wave filter or molding (like wedge shape) wave filter of pre-filtering; Be used for the x-ray imaging equipment that needs are regulated or selected X ray to be with, like CT, X ray projector equipment, C type arm equipment and micro-CT etc.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. X-ray energy spectrum selecting arrangement; Said device comprises a kind of X-ray tube; It is characterized in that said device also comprises a kind of reflectance coating filter lens, wherein; Said reflectance coating filter lens makes through layout between the direction of propagation of the X-ray beam that its surface sends with said X-ray tube and has an angle, so that the X ray of being scheduled to be with is reflected.
2. device according to claim 1 is characterized in that, said predetermined can being with comprise being with of an above keV magnitude.
3. require described device according to claim 1, it is characterized in that, said predetermined can being with comprise that an above 10keV～150keV is with interior being with.
4. according to claim 2 or 3 described devices, it is characterized in that said can band be separated from one another.
5. device according to claim 1 is characterized in that, said device further comprises the above reflectance coating filter lens, and these reflectance coating filter lenss are parallel.
6. device according to claim 1 is characterized in that, said reflectance coating filter lens comprises plural number kind material.
7. device according to claim 1 is characterized in that, said reflectance coating filter lens comprises the plural layer reflectance coating.
8. device according to claim 7 is characterized in that, the bed thickness of each layer reflectance coating is the nm magnitude.
9. device according to claim 8 is characterized in that, the bed thickness of said each layer reflectance coating is provided with according to following bragg's formula:
2d?sinθ＝λ，
Wherein, d representes the bed thickness of said each layer reflectance coating, and θ representes said angle, and λ representes the wavelength of the said predetermined X ray that can be with.
10. device according to claim 7 is characterized in that, said plural layer reflectance coating comprises the reflective coating that is made up of the W material and by B
4The reflective coating that the C material constitutes, these two kinds of reflective coating arranged alternate.
11. device according to claim 10 is characterized in that, the bed thickness of the said reflective coating that is made up of the W material is 1nm, and is said by B
4The bed thickness of the reflective coating that the C material constitutes is 1.5nm.
12. device according to claim 1 is characterized in that, said angle is 0.2 degree～2 degree.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106157639A CN102525492A (en) | 2010-12-31 | 2010-12-31 | Device for selecting X-ray energy spectrum |
| PCT/EP2011/074202 WO2012089794A1 (en) | 2010-12-31 | 2011-12-29 | An apparatus for selecting x-ray energy spectrum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106157639A CN102525492A (en) | 2010-12-31 | 2010-12-31 | Device for selecting X-ray energy spectrum |
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| CN102525492A true CN102525492A (en) | 2012-07-04 |
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| CN2010106157639A Pending CN102525492A (en) | 2010-12-31 | 2010-12-31 | Device for selecting X-ray energy spectrum |
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| CN (1) | CN102525492A (en) |
| WO (1) | WO2012089794A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930918A (en) * | 2012-10-30 | 2013-02-13 | 同济大学 | Soft X ray grazing incidence optical system based on double-energy-point multilayer membrane and application thereof |
| CN105873344A (en) * | 2016-03-22 | 2016-08-17 | 中国工程物理研究院流体物理研究所 | Transverse gradient multi-layer film reflective element based X-ray monoenergetic imaging method |
| CN106483152A (en) * | 2016-11-21 | 2017-03-08 | 中北大学 | A kind of X-ray energy spectrum imaging method |
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| US4675889A (en) * | 1985-07-08 | 1987-06-23 | Ovonic Synthetic Materials Company, Inc. | Multiple wavelength X-ray dispersive devices and method of making the devices |
| US4958363A (en) * | 1986-08-15 | 1990-09-18 | Nelson Robert S | Apparatus for narrow bandwidth and multiple energy x-ray imaging |
| US20020080916A1 (en) * | 1999-08-02 | 2002-06-27 | Licai Jiang | Multilayer optics with adjustable working wavelength |
| WO2009017348A2 (en) * | 2007-07-27 | 2009-02-05 | Hanwha L & C Corp. | Optical filter for a quasi-monochromatic x-ray and multi-energy x-ray imaging system with the quasi-monochromatic x-ray |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100373184C (en) | 2004-01-06 | 2008-03-05 | 同济大学 | Broad cut-off band bipassage bandpass optical filter and its preparation method |
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2010
- 2010-12-31 CN CN2010106157639A patent/CN102525492A/en active Pending
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- 2011-12-29 WO PCT/EP2011/074202 patent/WO2012089794A1/en active Application Filing
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|---|---|---|---|---|
| US4675889A (en) * | 1985-07-08 | 1987-06-23 | Ovonic Synthetic Materials Company, Inc. | Multiple wavelength X-ray dispersive devices and method of making the devices |
| US4958363A (en) * | 1986-08-15 | 1990-09-18 | Nelson Robert S | Apparatus for narrow bandwidth and multiple energy x-ray imaging |
| US20020080916A1 (en) * | 1999-08-02 | 2002-06-27 | Licai Jiang | Multilayer optics with adjustable working wavelength |
| WO2009017348A2 (en) * | 2007-07-27 | 2009-02-05 | Hanwha L & C Corp. | Optical filter for a quasi-monochromatic x-ray and multi-energy x-ray imaging system with the quasi-monochromatic x-ray |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102930918A (en) * | 2012-10-30 | 2013-02-13 | 同济大学 | Soft X ray grazing incidence optical system based on double-energy-point multilayer membrane and application thereof |
| CN105873344A (en) * | 2016-03-22 | 2016-08-17 | 中国工程物理研究院流体物理研究所 | Transverse gradient multi-layer film reflective element based X-ray monoenergetic imaging method |
| CN106483152A (en) * | 2016-11-21 | 2017-03-08 | 中北大学 | A kind of X-ray energy spectrum imaging method |
| CN106483152B (en) * | 2016-11-21 | 2019-10-22 | 中北大学 | A kind of X-ray energy spectrum imaging method |
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| Publication number | Publication date |
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| WO2012089794A1 (en) | 2012-07-05 |
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Application publication date: 20120704 |