CN103093850A - Filter assembly used for computer tomography system and computer tomography system - Google Patents
Filter assembly used for computer tomography system and computer tomography system Download PDFInfo
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- CN103093850A CN103093850A CN2011103618286A CN201110361828A CN103093850A CN 103093850 A CN103093850 A CN 103093850A CN 2011103618286 A CN2011103618286 A CN 2011103618286A CN 201110361828 A CN201110361828 A CN 201110361828A CN 103093850 A CN103093850 A CN 103093850A
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- pass filter
- support member
- filter assembly
- supporting piece
- upper supporting
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Abstract
The invention provides a filter assembly used for a computer tomography system and the computer tomography system, wherein the computer tomography system comprises the filter assembly. The computer tomography system is provided with an X-ray source, wherein the X-ray source is used for projecting X-ray bundles along a projecting shaft. The filter assembly comprises one or multiple filter components and supporting components, wherein the one or multiple filter components can enable the X-ray bundles to be attenuated and the supporting components can be used for supporting the one or multiple filter components. At least two relative sides of at least one filter component of the one or multiple filter components are respectively provided with one connecting portion except exposed sides, wherein the exposed sides are exposed to the X-ray bundles and the at least one connecting portion can be used for fixing the at least one filter component on the supporting components. The filter assembly has the advantages of being higher in intensity, capable of resisting effects brought by the centrifugal force and the thermal expansion of a high-end captive test (CT) system, capable of reducing manufacturing difficulty and capable of reducing manufacturing cost.
Description
Technical field
Relate generally to computer tomography of the present invention (CT) system, and relate more particularly to a kind of pass filter assembly for computed tomography systems and corresponding computed tomography systems.
Background technology
The CT system generally includes the x radiographic source, and it passes and be imaged object (being the patient) and by the fladellum of x ray detector array received to form guiding through calibration.In the CT system; the system that is called as collimating apparatus is usually used for making the x x radiation x dosage that the patient receives to minimize and homogenising; thereby the protection patient, and make approx the even intensity of the x ray that is received by the detecting device in the CT system, improve thus the sensitivity of detecting device.A kind of mode that realizes this target is to insert the pass filter assembly on the path of x beam.
Fig. 1 is the schematic exploded view of the pass filter assembly of prior art.Pass filter assembly shown in Figure 1 is generally used for low side CT system.This pass filter assembly can comprise support member 1 ', butterfly pass filter (bowtie filter) 2 ' and copper film 15 '.In Fig. 1, the support member 1 ' of pass filter assembly is to comprise the end support member integrative-structure of (also claiming the bottom pass filter).In the pass filter assembly of Fig. 1, only comprise a butterfly pass filter 2 '.This butterfly pass filter 2 ' can be divided into two kinds, has respectively large and small two kinds of different spline surfaces.As shown in the figure, butterfly pass filter 2 ' is fixed on support member 1 ' by a plurality of screws 13 ' in the middle.Copper film 15 ' is used for the x ray of further decaying when scan patients head or health.
Butterfly pass filter 2 ' is generally synthetic polymer, and Teflon for example, this synthetic polymer have the x radiation absorption spectral characteristic that is similar to water and is similar to thus human body.This butterfly pass filter can also be graphite.Butterfly pass filter 2 ' is intended to compensate and is imaged the variation of body aspect thickness.Pass this and be imaged the body center, usually the x ray that is also the thickest part is decayed minimumly by butterfly pass filter 2 ', be imaged the body edge and pass, usually the x ray that is also the thinnest part is decayed manyly by butterfly pass filter 2 ', thereby makes the x x radiation x dosage that the patient receives become even.Correspondingly, the radiation dose that passes the x ray that the patient arrives detecting device also can become even.
Support member 1 ' is used for holding and supporting butterfly pass filter 2 '.In the prior art, support member 1 ' is usually made of aluminum and be manufactured to one.The end support member that support member 1 ' comprises also plays the effect of filtration simultaneously, matches with the shape of butterfly pass filter, and end support member
The bottom is processed with spline surface, makes it have inhomogeneous thickness, and its thinnest part only has the thickness of a few tenths of a mm usually.
In high-end CT system, due to very high rotational speed and larger aperture, can produce very large centrifugal force.In addition, in high-end CT system, detector size is widened, and for being complementary with it, the size of pass filter also can correspondingly be widened, and this has increased the quality of pass filter, has further increased centrifugal force.Thermal expansion also can occur along with the variation of environment temperature and other factors in each material that in addition, consists of the pass filter assembly.
Yet as shown in Figure 1, in the prior art, butterfly pass filter 2 ' is upward for the thickness less at the position that is connected with support member, and the intensity that itself can provide is limited.In addition, at butterfly pass filter 2 ' middle part, cause stressed relatively concentrated due to connecting portion.Therefore, under centrifugal force and the caused stress of thermal expansion in high-end CT system, butterfly pass filter 2 ' is easily chipping.
In addition, as mentioned above, support member 1 ' is made by highly purified aluminium usually.As everyone knows, aluminium itself is the not high metal of a kind of intensity, under above-mentioned centrifugal force and the caused stress of thermal expansion, is easy to occur moderate finite deformation.
In addition, as mentioned above, the end support member of support member 1 ' has inhomogeneous thickness, but whole support member is integrated.Need wider pass filter in high-end CT system, in integrated situation, also will form simultaneously end support member in uneven thickness, there is great difficulty in this on making.In addition, in the prior art, must be very high for the manufacture of the purity of the aluminium of support member 1 ', thus make manufacturing cost higher.
Therefore, in the art, need a kind of pass filter assembly that can overcome the problems referred to above and corresponding CT system.
Summary of the invention
The object of the present invention is to provide a kind of in high-end CT system centrifugal force and the effect of thermal expansion under only occur very little distortion, easily make and the pass filter assembly of cost and corresponding CT system.
For achieving the above object, the invention provides a kind of pass filter assembly for computed tomography systems, this computed tomography systems has for the x radiographic source along axis of projection projection x beam, this pass filter assembly comprises: one or more pass filter elements are used for making the decay of x beam; And support member, be used for supporting these one or more pass filter elements, wherein at least one the pass filter element in these one or more pass filter elements has respectively at least one coupling part at least two opposite flanks except the exposure that is exposed to the x beam, is used for this at least one pass filter element is fixed to support member.
The present invention also provides a kind of computed tomography systems, comprises according to pass filter assembly of the present invention.
Description of drawings
According to the detailed description of hereinafter carrying out with reference to accompanying drawing, the purpose of above and other of the present invention and feature will become obviously, wherein:
Fig. 1 is the schematic exploded view of the pass filter assembly of prior art;
Fig. 2 is the schematic three-dimensional three-dimensional view of pass filter assembly according to an embodiment of the invention;
Fig. 3 is the schematic exploded view of pass filter assembly according to an embodiment of the invention;
Fig. 4 be according to an embodiment of the invention the pass filter assembly along the diagrammatic cross-sectional view in A-A cross section;
Fig. 5 is the 3 D stereo view of the different angles of the upper supporting piece of pass filter assembly according to an embodiment of the invention; And
Fig. 6 is the 3 D stereo view of the different angles of the end support member of pass filter assembly according to an embodiment of the invention and pass filter.
In these accompanying drawings, represent same or analogous part with identical reference number.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
Fig. 2 is the schematic three-dimensional three-dimensional view of pass filter assembly according to an embodiment of the invention.Pass filter assembly shown in Figure 2 can comprise upper supporting piece 1, little butterfly pass filter 2, large butterfly pass filter 3, copper film 15 and end support member 4.Upper supporting piece 1 can have two rectangle holes, thereby can hold two graphite or Teflon pass filter.At the end of upper supporting piece 1, can have corresponding feature, make this pass filter assembly can be arranged on linear carrying slide block and move under direct motor drive.Reinforcement in upper supporting piece 1 has strengthened the intensity of pass filter assembly.Wherein, little butterfly pass filter 2 can be used for patient's head is carried out CT examination, and large butterfly pass filter 3 can be used for CT examination is carried out at patient other positions.Copper film 15 can with prior art in identical.
Should be noted that Fig. 2 just schematically.Different embodiment according to the subject invention, upper supporting piece 1 can be integrative-structure with end support member 4, the quantity of butterfly pass filter can be different, perhaps can adopt the pass filter of other shapes, and copper film 15 are optional.
Fig. 3 is the schematic exploded view of pass filter assembly according to an embodiment of the invention.As shown in Figure 3, can respectively have one at the two ends of butterfly pass filter 2 and 3 with the coupling part of boring, be used for being fastened to upper supporting piece 1 by screw 13, rather than be connected (referring to Fig. 1) with support member by the thinner part in the middle part of pass filter as in prior art.At first the advantage of doing like this be, the force part is moved on to two-end thickness larger zone from the weakness zone at butterfly pass filter 2 and 3 middle parts, greatly improved the intensity of force part itself.That does like this is also advantageous in that, from mechanics principle, changes concentrated force way of the prior art into two ends respectively stressed, makes stressed more even on whole butterfly pass filter 2 and 3, thereby has improved the bulk strength of butterfly pass filter 2 and 3.
As shown in Figure 3, butterfly pass filter 2 and 3 shape of a saddle recess are arranged in the exposure that is exposed to the x beam of this butterfly pass filter. Butterfly pass filter 2 and 3 except exposure, two ends with two opposite flanks the coupling part of boring on can have respectively at least one shoulder shape surface 11 or 12 (referring to Fig. 6), be used for upper supporting piece 1 on corresponding shoulder shape surface 5 or 6 (referring to Fig. 5) coupling that has.This has further increased the intensity of whole pass filter assembly.
In addition, as shown in Figure 3, the integral type support member 1 ' of prior art is substituted by upper supporting piece 1 and end support member 4 these two parts that separate.This makes can separately make upper supporting piece 1 and end support member 4, thereby reduces manufacture difficulty.In addition, can also make upper supporting piece 1 and end support member 4 with different materials, then connect them with screw 14.For example, upper supporting piece 1 can be with making than the material of end support member semi-finals Du Genggao.According to embodiments of the invention, upper supporting piece 1 can be used the aluminium alloy manufacturing, and end support member 4 can be made with aluminium.In this case, end support member 4 is called end support member aluminium pass filter.By doing like this, not only strengthened the intensity of upper supporting piece 1, and reduced manufacturing cost (because only having end support member 4 to make with highly purified aluminium).
Should be noted that Fig. 3 just schematically.Different embodiment according to the subject invention, the coupling part with boring on butterfly pass filter 2 and 3 can not be positioned at two ends, but is positioned on other sides, as long as this side is not the exposure of this butterfly pass filter.Similarly, what the position on butterfly pass filter 2 and 3 shoulder shape surface also can be from shown in Fig. 3 is different, and for example, this shoulder shape surface can be positioned at the two ends of butterfly pass filter 2 and 3.Upper supporting piece 1 and end support member 4 can also be made with other suitable materials existing or exploitation in the future.In addition, may be used alone, can also be used in combination with coupling part, the shoulder shape surface of boring and upper supporting piece 1 and end support member 4 these three stack features of separately making.Even in same pass filter assembly, also can adopt simultaneously according to butterfly pass filter of the present invention (for example the butterfly pass filter 2) with according to the butterfly pass filter (for example the butterfly pass filter 3) of prior art.Screw 13 and 14 can be substituted by other mechanical connections.Mechanical connection is process and the method for utilizing securing member that part is coupled together.Machanical fastener commonly used mainly contains bolt, screw and rivet.Mechanical connection is more reliable than interconnection techniques such as splicing or spot welding, and easily changes.Certainly, screw 13 substitutes with being connected also can be connected by on-mechanical.
Fig. 4 be according to an embodiment of the invention the pass filter assembly along the diagrammatic cross-sectional view in A-A cross section.In Fig. 4, the x axle is parallel with the axis of projection of the radiogenic x beam of x, and y axle and z axle define the plane perpendicular to the x axle perpendicular to the x axle.As shown in Figure 4, on y axle and z direction of principal axis, can have the space between upper supporting piece 1 and butterfly pass filter 2 and 3, this provides certain space for the thermal expansion on this both direction.On the x direction of principal axis, butterfly pass filter 2 and 3 shoulder shape surface 11 or 12 with upper supporting piece 1 on corresponding shoulder shape surface 5 or 6 (referring to Fig. 5) mate.Shoulder shape surface 11 or 12 can be very narrow, has the space thereby make between upper supporting piece 1 and butterfly pass filter 2 and 3, for certain space has been reserved in the possible thermal expansion on the y direction of principal axis.
Should be noted that Fig. 4 just schematically.Different embodiment according to the subject invention, quantity and the position of shoulder shape surperficial 11 and 12 can differences to that indicated in the drawings.
Fig. 5 is the 3 D stereo view of the different angles of the upper supporting piece of pass filter assembly according to an embodiment of the invention.Can be clear that the shoulder shape surface 5 or 6 and be used for the boring that is connected with end support member 4 on upper supporting piece 1 from Fig. 5.
Fig. 6 is the 3 D stereo view of the different angles of the end support member of pass filter assembly according to an embodiment of the invention and pass filter.Can be clear that from Fig. 6 butterfly pass filter 2 and the shoulder shape of being connected surface 11 or 1 and end support member 4 be used for the boring that is connected with upper supporting piece 1.As shown in Figure 6, end support member 4 can have supporting walls edge 7, and this supporting walls edge 7 can be designed as has higher hardness, has again the manufacturability of improvement simultaneously.End support member 4 can be fixed to upper supporting piece 1 by screw 14, the lower surface coupling of the surface of end support member 4 and upper supporting piece 1.Therefore, centrifugal force will be applied on the lower surface rather than end support member 4 of upper supporting piece 1.In addition, end support member 4 can also have respectively low profile 8 and the large profile 9 with little butterfly pass filter 2 and large butterfly pass filter 3 couplings.
The present invention also provides a kind of computed tomography systems that comprises according to pass filter assembly of the present invention.
Pass filter assembly according to the present invention has higher intensity, can resist the impact that centrifugal force in high-end CT system and thermal expansion bring, and has reduced manufacture difficulty, and has reduced manufacturing cost.
Should be noted that embodiment described above is only exemplary and nonrestrictive, and those skilled in the art can design a lot of alternatives in the situation that do not depart from the scope of appended claims.The verb that uses " comprises " does not get rid of element and the element outside step and the step of putting down in writing in claims or instructions.The word that used before element " one " is not got rid of and is had a plurality of this elements.In the claims, any reference number that is placed in bracket all should not be construed as limitations on the claims.
Claims (11)
1. pass filter assembly that is used for computed tomography systems, described computed tomography systems has for the x radiographic source along axis of projection projection x beam, and described pass filter assembly comprises:
One or more pass filter elements are used for making the decay of x beam; And
Support member is used for supporting described one or more pass filter element,
At least one pass filter element in wherein said one or more pass filter element has respectively at least one coupling part at least two opposite flanks except the exposure that is exposed to the x beam, be used for described at least one pass filter element is fixed to described support member.
2. pass filter assembly according to claim 1, wherein said support member comprise upper supporting piece and the end support member of separately making.
3. pass filter assembly according to claim 2, wherein for the manufacture of the intensity of the material of described upper supporting piece higher than the intensity for the manufacture of the material of support member of the described end.
4., wherein on the direction vertical with described axis of projection, there is the space in pass filter assembly according to claim 1 between described at least one pass filter element and described support member.
5., wherein on the direction vertical with described axis of projection, there is the space in pass filter assembly according to claim 2 between described at least one pass filter element and described upper supporting piece.
6. pass filter assembly according to claim 1, has respectively at least one shoulder shape at least at least on two opposite flanks of wherein said at least one pass filter element in all the other sides except the exposure that is exposed to the x beam and described two opposite flanks surperficial, and it is surperficial to have corresponding shoulder shape on wherein said support member, thereby described at least one pass filter element is matched described support member.
7. pass filter assembly according to claim 1, wherein said at least one coupling part connect by mechanical connection or on-mechanical and are connected with described support member.
8. pass filter assembly according to claim 2, has respectively at least one shoulder shape at least at least on two opposite flanks of wherein said at least one pass filter element in all the other sides except the exposure that is exposed to the x beam and described two opposite flanks surperficial, and it is surperficial to have corresponding shoulder shape on wherein said upper supporting piece, thereby described at least one pass filter element is matched described upper supporting piece.
9. pass filter assembly according to claim 2, wherein said at least one coupling part connect by mechanical connection or on-mechanical and are connected with described upper supporting piece.
10. pass filter assembly according to claim 3, wherein the material for the manufacture of described upper supporting piece is aluminium alloy, and is aluminium for the manufacture of the material of support member of the described end.
11. a computed tomography systems comprises according to claim 1-10 described pass filter assemblies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110361828.6A CN103093850B (en) | 2011-10-31 | 2011-10-31 | Filter assembly used for computer tomography system and computer tomography system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110361828.6A CN103093850B (en) | 2011-10-31 | 2011-10-31 | Filter assembly used for computer tomography system and computer tomography system |
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| Publication Number | Publication Date |
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| CN103093850A true CN103093850A (en) | 2013-05-08 |
| CN103093850B CN103093850B (en) | 2017-04-26 |
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| CN201110361828.6A Active CN103093850B (en) | 2011-10-31 | 2011-10-31 | Filter assembly used for computer tomography system and computer tomography system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103829963A (en) * | 2012-11-27 | 2014-06-04 | Ge医疗系统环球技术有限公司 | Collimation instrument and CT system with same |
| CN105640581A (en) * | 2016-02-29 | 2016-06-08 | 江苏美伦影像系统有限公司 | Oral cavity CT front X-ray filter |
Citations (5)
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|---|---|---|---|---|
| US3631249A (en) * | 1968-10-03 | 1971-12-28 | Siemens Ag | Adjustment apparatus for x-ray wedge filter plates |
| US3717768A (en) * | 1970-02-09 | 1973-02-20 | Medinova Ab | X-ray filter device in combination with a positioning light converging means |
| US3819937A (en) * | 1971-03-11 | 1974-06-25 | A Sovijarvi | Apparatus and method for making x-ray films |
| US3976889A (en) * | 1973-09-19 | 1976-08-24 | Siemens Aktiengesellschaft | X-ray diagnostic apparatus |
| US20110033030A1 (en) * | 2007-12-28 | 2011-02-10 | Koninklijke Philips Electronics N.V. | Filter assembly for computed tomography systems |
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2011
- 2011-10-31 CN CN201110361828.6A patent/CN103093850B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3631249A (en) * | 1968-10-03 | 1971-12-28 | Siemens Ag | Adjustment apparatus for x-ray wedge filter plates |
| US3717768A (en) * | 1970-02-09 | 1973-02-20 | Medinova Ab | X-ray filter device in combination with a positioning light converging means |
| US3819937A (en) * | 1971-03-11 | 1974-06-25 | A Sovijarvi | Apparatus and method for making x-ray films |
| US3976889A (en) * | 1973-09-19 | 1976-08-24 | Siemens Aktiengesellschaft | X-ray diagnostic apparatus |
| US20110033030A1 (en) * | 2007-12-28 | 2011-02-10 | Koninklijke Philips Electronics N.V. | Filter assembly for computed tomography systems |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103829963A (en) * | 2012-11-27 | 2014-06-04 | Ge医疗系统环球技术有限公司 | Collimation instrument and CT system with same |
| CN105640581A (en) * | 2016-02-29 | 2016-06-08 | 江苏美伦影像系统有限公司 | Oral cavity CT front X-ray filter |
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| Publication number | Publication date |
|---|---|
| CN103093850B (en) | 2017-04-26 |
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