CN209404801U - A kind of anti-scatter grid - Google Patents
A kind of anti-scatter grid Download PDFInfo
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- CN209404801U CN209404801U CN201721471902.9U CN201721471902U CN209404801U CN 209404801 U CN209404801 U CN 209404801U CN 201721471902 U CN201721471902 U CN 201721471902U CN 209404801 U CN209404801 U CN 209404801U
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- scatter grid
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- scatter
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Abstract
A kind of X-ray anti-scatter grid, including multiple anti-scatter grid panels and multiple pedestals, the multiple anti-scatter grid panel are connected with multiple pedestals respectively, and the X-ray at least partially across anti-scatter grid panel can be absorbed in the pedestal.In this application, the first interval is formed between adjacent anti-scatter grid panel, the second interval is formed between adjacent susceptors, second interval is less than the first interval.
Description
Technical field
This application involves Medical Imaging Technology field, in particular to a kind of X-ray anti-scatter grid.
Background technique
In the Medical Imaging System of x-ray imaging technology, for example, in computer tomography (Computed
Tomography, CT) in system, what is recorded is X-ray by the intensity after human body.The X issued from X-ray emission source is penetrated
Line can be divided into three parts after human body: (1) being absorbed by the body；(2) imaging region is incident upon after cutting across human body；(3)
Intensity, frequency and direction are changed after interacting with human body, some of them may eventually pass through human body with different angles
Degree, position are incident upon imaging region.The X-ray that former X-ray characteristic is changed after human body is referred to as scattered x-ray.In general,
Scattered x-ray can reduce the image quality of image.Therefore, it is necessary to filter scattered x-ray as much as possible.
In existing X-ray anti-scatter technology, what is generallyd use is set between irradiated object and X-ray detector
Set anti-scatter grid.Anti-scatter grid panel is made of the good material of shielding X-ray performance, and is directed toward the focus in X-ray emission source.
Scattered x-ray is sponged after being irradiated to anti-scatter grid by anti-scatter grid panel, and the space between anti-scatter grid panel allows non-
The X-ray of scattering passes through.
However, during actually using X-ray scanning, due to may cause X-ray there are continuous high volume scan
The case where focal shift of bulb, occurs.In some embodiments, focal shift will affect the X-ray across anti-scatter grid,
It is inconsistent so as to cause each module of detector and interchannel response variation.In severe cases, it may result in final
Occurs artifact in scan image.Therefore, reduce or shield the inconsistent of the response variation of detector caused by bulb focal variation
Influence be very necessary.
Utility model content
For the influence of the focal variation of the above-mentioned X-ray bulb existing in the prior art of reduction, the application provides a kind of spy
The anti-scatter grid very designed.
On the one hand the application discloses a kind of anti-scatter grid, comprising: multiple anti-scatter grid panels and multiple pedestals, it is described
Multiple anti-scatter grid panels are connected with the multiple pedestal respectively.The first interval is formed between adjacent anti-scatter grid panel, it is adjacent
The second interval is formed between pedestal, second interval is less than the first interval.
In this application, the thickness of the anti-scatter grid panel is less than the width of the pedestal；The pedestal protrudes from institute
The two sides of anti-scatter grid panel are stated, the protrusion part of pedestal is absorbed into the X-ray for least partially penetrating the anti-scatter grid panel；Extremely
The width of protrusion part described in few side is not less than 20 μm.
In this application, the width close to the pedestal at anti-scatter grid center is less than the pedestal positioned at anti-scatter grid two sides
Width.
In this application, the anti-scatter grid panel is connected to the middle position of the pedestal.
In this application, the material that filling allows X-ray to pass through between the pedestal.
In this application, the pedestal connects detector, and the detector includes multiple probe units, the position of the pedestal
Set the gap corresponded between adjacent detector unit.
In this application, the width of the pedestal is greater than the gap width between adjacent detector unit.
In this application, the anti-scatter grid panel is vertical with the pedestal connect.
On the other hand the application discloses a kind of anti-scatter grid, the anti-scatter grid is set to X-ray emission source and spy
It surveys between device.The anti-scatter grid includes anti-scatter grid unit, limits multiple radiation between the anti-scatter grid unit
Path, the multiple radiation path are passed the radiation through and are incident on the detector；The anti-scatter grid unit is towards institute
The face area for stating detector is greater than the face area towards the X-ray emission source.
In this application, the anti-scatter grid unit is " L " type or inverted " t " type.
The application compared with the existing technology, passes through the structure barrier of anti-scatter grid ray due to caused by focal variation point
Cloth inhibits the response of detector to change, so as to improve image quality.
Detailed description of the invention
Fig. 1 is in some embodiments of the application using the schematical axial view of the CT system of anti-scatter grid；
Fig. 2 is the schematical side view of anti-scatter grid shown in some embodiments of the application；
Fig. 3 is anti-scatter grid shown in some embodiments of the application and the schematic diagram of bulb positional relationship；
Fig. 4 is the schematical perspective view of anti-scatter grid shown in some embodiments of the application；And
Fig. 5 is the schematical perspective view of anti-scatter grid shown in some embodiments of the application.
Fig. 1 label: 102 be X-ray emission source, and 104 be irradiated object, and 106 be anti-scatter grid, and 108 be detector
Device, 110 be transmitted ray, and 112 be scattered ray.
Fig. 2 label: 202a, 202b, 202c are anti-scatter grid panel, and 203a, 203b, 203c are pedestal, and 204 be gap.
Fig. 3 label: 302,312 be bulb focus, 303,304,314,315 be ray, 305 be anti-scatter grid panel, 306
It is detector for pedestal, 307.
Fig. 4 label: 401-404 is anti-scatter grid panel, and 411-414 is pedestal.
Fig. 5 label: 501,502 be anti-scatter grid panel, and 511,512 be pedestal.
Specific embodiment
In order to illustrate more clearly of the technical solution of embodiments herein, will make below to required in embodiment description
Attached drawing is briefly described.
Fig. 1 is the computer tomography (Computed that anti-scatter grid is applied in some embodiments of the application
Tomography, CT) system 100 schematical axial diagram.It is to be understood that CT is intended only as Medical Imaging System
One example, the anti-scatter grid in the application can be adapted for other using X-ray or the image of other kinds of ray
System.As shown in Figure 1, CT system 100 includes X-ray emission source 102 and detector assembly 108.Anti-scatter grid 106 is located at X
Between ray emission source 102 and detector assembly 108.Detector assembly 108 includes detector substrate and multiple scintillation crystals.Institute
The X-ray detected can be responded by stating scintillation crystal, generate electric signal for follow-up signal processing.It is sent out when X-ray by X-ray
After penetrating the sending of source 102 and passing through irradiated object 104 (for example, being detected human body), a part of scattered x-ray is (for example, penetrate
Line 112) it is absorbed by anti-scatter grid 106, a part of X-ray (for example, transmitted ray 110) passes through anti-scatter grid 106 and quilt
Detector assembly 108 detects.
In some embodiments, anti-scatter grid 106 can be directly arranged on detector assembly 108.For example, anti-scatter grid
Lattice 106 directly contact (upper surface of example as shown in figure 1) with the surface of detector assembly 108.In some embodiments, anti-scatter grid
Lattice 106 can be fixed at a certain distance from 108 top of detector assembly by bracket or other devices.
Fig. 2 is the schematical side view of anti-scatter grid shown in some embodiments of the application.As shown in Fig. 2, anti-scattered
Penetrating grid 106 includes multiple anti-scatter grid panels and multiple pedestals.Multiple anti-scatter grid panels and multiple pedestals can distinguish shape
At array distribution.For example, anti-scatter grid array includes anti-scatter grid panel 202a, anti-scatter grid panel 202b and anti-scattered
Penetrate Turbogrid plates 202c.Pedestal array includes pedestal 203a, pedestal 203b and pedestal 203c.In some embodiments, anti-scatter
An anti-scatter grid panel in grid array is corresponding with a pedestal in pedestal array.For example, anti-scatter grid panel 202a
It can be set above pedestal 203a, anti-scatter grid panel 202b can be set above pedestal 203b, anti-scatter grid panel
202c can be set above pedestal 203c.In some embodiments, an anti-scatter grid panel in anti-scatter grid array
It is vertically connected with a pedestal in pedestal array.For example, anti-scatter grid panel 202a can be vertically set on pedestal 203a.
In some embodiments, anti-scatter grid panel and pedestal can be integrally formed.For example, anti-scatter grid panel 202a and pedestal 203a
It is integrally formed；Or anti-scatter grid panel 202a, 202b and 202c and pedestal 203a, 203b and 203c are integrally formed.One
In a little embodiments, anti-scatter grid panel can be integrally formed and/or pedestal can be integrally formed.For example, anti-scatter grid panel
202a, 202b and 202c are integrally formed；Or pedestal 203a, 203b and 203c are integrally formed；Or anti-scatter grid panel 202a,
202b and 202c is integrally formed and pedestal 203a, 203b and 203c are integrally formed.Integrated molding mentioned here refers to one
A anti-scatter grid panel and a pedestal can form an anti-scatter grid unit, the anti-scatter grid panel and the pedestal
Respectively constitute a part of the anti-scatter grid unit.Multiple radial roads can be limited between the anti-scatter grid unit
Diameter, the multiple radiation path, which allows to radiate, to be passed through and is incident on the detector connecting with anti-scatter grid unit.It is described anti-
End face (that is, pedestal one end towards detector) area of the scatter grid unit towards detector is greater than the anti-scatter grid list
End face (that is, anti-scatter grid plate face to one end of x-ray source) of the member towards x-ray source.Optionally, the anti-scatter grid list
Member is " L " type or inverted " t " type.In some embodiments, anti-scatter grid panel can be welded on corresponding pedestal.In some realities
It applies in example, anti-scatter grid panel is connected with corresponding pedestal by a kind of dismountable mode.For example, can be set on the base
The track coincideing with anti-scatter grid edges of boards edge, anti-scatter grid panel be can be inserted or slid into track thus with pedestal phase
Even.The material of anti-scatter grid panel and the material of pedestal can be identical or different.Preferably, anti-scatter grid panel or pedestal
Material includes at least one of lead, molybdenum, tungsten or the alloy at least one of lead, molybdenum, tungsten for ingredient.
The channel of X-ray transmission is defined between pedestal, to reduce the decaying of transmission X-ray.Such as have between pedestal
Gap (as shown in 204 in Fig. 2) is used for transmission X-ray；Either filling does not absorb or does not absorb substantially X-ray in gap 204
Material.In some embodiments, which can be with the relative position between fixed pedestal.The packing material can pass through
The mode of injection molding forms.For example, the packing material of molten condition is infused in the state that temperature is higher than the fusing point of the packing material
Enter between pedestal array, can get solid packing material after supercooling.In the case where packing material is added by injection molding,
Different filling effects can be realized by using different molds.
It is worth noting that, be above an example for the description of packing material, those skilled in the art can be with
It in the case where not paying additional effort, modifies to the method and structure in the example, the modification is still the application's
In protection scope.For example, packing material can also be filled between anti-scatter grid array or part anti-scatter grid panel.
As shown in Fig. 2, pedestal 203a protrudes from the two sides of anti-scatter grid panel 202a, i.e. the width of pedestal 203a is greater than anti-
The thickness of scatter grid panel 202a.The width of pedestal mentioned here refers to channel direction (i.e. in figure of the pedestal along detector
Y-axis direction) length, the thickness of anti-scatter grid panel refers to that anti-scatter grid panel (is schemed along the channel direction of detector
Middle y-axis direction) length.The interval width formed between adjacent anti-scatter grid panel is greater than the interval formed between adjacent susceptors
Width.For example, the interval width between anti-scatter grid panel 202a and anti-scatter grid panel 202b is greater than pedestal 203a and pedestal
Interval width between 203b.In some embodiments, anti-scatter grid panel is located at the middle position of pedestal, i.e. pedestal is located at anti-
Width on the left of scatter grid is equal to pedestal and is located at the width on the right side of anti-scatter grid.In some embodiments, pedestal is at least
The width of one bulge point is not less than 20 μm.Protrusion part mentioned here refers to that the channel direction along detector (is schemed
Middle y-axis direction) on, the part that is not connected with anti-scatter grid panel on pedestal.Preferably, the width of two sides of base protrusion part
Degree is 30 μm respectively.Under some embodiments, anti-scatter grid array and pedestal array are in one-dimensional arrangement, and pedestal is at least at one
Width on direction is greater than the thickness of anti-scatter grid panel, is specifically shown in Fig. 4 and its associated description.In some embodiments, anti-scattered
Grid array and pedestal array are penetrated in two dimension arrangement, the width of pedestal at least in two directions is respectively greater than anti-scatter grid panel
Thickness, be specifically shown in Fig. 5 and its associated description.
Fig. 3 is the schematic diagram of the positional relationship of anti-scatter grid shown in some embodiments of the application and bulb.Such as Fig. 3
Shown, anti-scatter grid panel 305 can connect on pedestal 306, and the width of pedestal 306 along the y-axis direction is greater than anti-scatter grid
The thickness of plate 305.Pedestal 306 can be erected at 307 top of detector of X-ray equipment.Detector 307 may include a spy
Survey a unit 307a and probe unit 307b.Probe unit 307a or probe unit 307b may include one or more flashings
Crystal.In some embodiments, the bottom of anti-scatter grid panel 305 can be between probe unit 307a and probe unit 307b
Gap alignment.The width of pedestal 306 is greater than the gap width between probe unit 307a and probe unit 307b.X-ray ball
Pipe is located at anti-scatter grid 305, the same side of pedestal 306 and detector 307.Since X-ray has certain angle of divergence
Degree, in order to guarantee that anti-scatter grid array can shield the X-ray via irradiation object scatter as much as possible, without influencing from X
Directly through the X-ray of irradiation object after ray tube transmitting, can be between the anti-scatter grid panel in anti-scatter grid array
Certain angle, and X-ray bulb is then located at focal point pointed by anti-scatter grid array.Thus, anti-scatter grid panel 305
It will form a small angle between other anti-scatter grid panels.
When X-ray passes through anti-scatter grid array and pedestal array, a part of X-ray can be by anti-scatter grid panel
305 or pedestal 306 absorb, a part of X-ray can be radiated on detector 307.As shown, when X-ray bulb focus is located at
When 302 position, ray 303 falls in d point position after can passing through anti-scatter grid panel 305, forms shadow region on the left of d point, penetrates
Line 304 falls in b point after can passing through anti-scatter grid panel 305, and forms shadow region on the right side of b point.Similar, when X-ray ball
When pipe focal shift is to 312 position, ray 315 fall in c point after can passing through anti-scatter grid panel 305, and yin is formed on the left of c point
Shadow zone, ray 314 fall in a point after can passing through anti-scatter grid panel 305, form shadow region on the right side of a point.It can be seen that working as X
The position of ray tube focus changes (for example, in the detection, due to continuous high volume scan, leading to the coke of X-ray bulb
Point shifts) when, different size of shadow region can be generated on pedestal 306.Since X-ray, X-ray can be absorbed in pedestal
The variation of shadow region caused by bulb focal variation does not interfere with response of the detector for X-ray.Specifically, as in Fig. 3
Shown, the variation in shadow region is located on pedestal 306, and the part that do not blocked by pedestal 306 on probe unit 307a or 307b
The response of X-ray is not influenced by shadow region.Therefore, pedestal can reduce shadow region variation and respond X-ray to detector
Influence.In some embodiments, in the case where no pedestal, the variation of X-ray bulb focus will lead to detector array
In a channel to X-ray response there are 1 ‰ to 3 ‰ deviations.Response in view of channels different in detector to X-ray
Change inconsistent, the variation of X-ray bulb focus may cause on the picture ultimately generated that there are artifacts.
Fig. 4 is the schematical perspective view of anti-scatter grid shown in some embodiments of the application.As shown in figure 4, anti-scattered
Penetrating grid includes anti-scatter grid array and pedestal array.Anti-scatter grid array includes anti-scatter grid panel 401, anti-scatter grid
Panel 402, anti-scatter grid panel 403 and anti-scatter grid panel 404.Pedestal array includes pedestal 411, pedestal 412, pedestal
413 and pedestal 414.The pedestal in anti-scatter grid panel and pedestal array in anti-scatter grid array corresponds, and
Channel direction (the y-axis direction i.e. in figure) along detector array arranges, and forms one-dimensional anti-scatter grid.Pedestal 411, pedestal
412, pedestal 413, pedestal 414 protrude anti-scatter grid panel 401, anti-scatter grid panel along the channel direction of detector array respectively
402, anti-scatter grid panel 403, anti-scatter grid panel 404.In some embodiments, the width of different pedestals can be identical
, for example, pedestal 411, pedestal 412, pedestal 413, pedestal 414 can have same width.In some embodiments, different
The width of pedestal can be different.For example, the width close to the pedestal of anti-scatter grid array center can be greater than positioned at anti-scatter
The width of the width of the pedestal of grid array two sides or the pedestal close to anti-scatter grid array center, which can be less than to be located at, to be prevented
The width of the pedestal of scatter grid array two sides.It is corresponding since the X-ray angle for being incident to anti-scatter grid marginal position is larger
Anti-scatter grid panel generate shadow region it is relatively large, therefore corresponding base width can be set it is larger, preferably to disappear
Influence caused by except being responded on detector.
Fig. 5 is the schematical perspective view of anti-scatter grid shown in some embodiments of the application.As shown in figure 5, anti-scattered
Penetrating grid array includes anti-scatter grid panel 501 and anti-scatter grid panel 502.Pedestal array includes pedestal 511 and pedestal 512,
Pedestal 511 and 512 X-shape of pedestal are integral.In one embodiment, pedestal 511 and pedestal 512 can be integrally formed.One
In embodiment, pedestal 511 and pedestal 512 are vertically connected.In anti-scatter grid panel and pedestal array in anti-scatter grid array
Pedestal respectively along the channel direction (the y-axis direction i.e. in figure) of detector array and the slice direction of detector (i.e. in figure
Z-axis direction) arrangement, formed two-dimensional anti-scatter grid.Pedestal 511 protrudes anti-scatter grid along the channel direction of detector array
Plate 501.Pedestal 512 protrudes anti-scatter grid panel 502 along the slice direction of detector array.In some embodiments, along detection
The width of the width of the pedestal of device array channel direction arrangement and the pedestal along the arrangement of detector array slice direction is identical.
For example, pedestal 511 and pedestal 512 can have identical width, (width of pedestal 511 refers to length along the y-axis direction, pedestal
512 width refers to length along the z-axis direction).In some embodiments, along the pedestal of detector array channel direction arrangement
The width of width and the pedestal along the arrangement of detector array slice direction can be different.For example, the width of pedestal 511 is greater than and base
The width of seat 512.In some embodiments, the width of pedestal is depending on the shape of X-ray bulb, the shape of the X-ray beam of transmitting
Shape, the offset etc. that X-ray bulb may occur.
In the present embodiment, pedestal 511 and pedestal 512 are coplanar.In other embodiments, pedestal 511 and pedestal 512 can also
With non-coplanar.
The foregoing is merely the preferred implementations of the application, are not intended to limit this application, for the technology of this field
For personnel, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model, made
Any modification, equivalent substitution, improvement and etc. should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of anti-scatter grid characterized by comprising
Multiple anti-scatter grid panels form the first interval between adjacent anti-scatter grid panel；
Multiple pedestals, form the second interval between adjacent susceptors, the multiple anti-scatter grid panel respectively with the multiple pedestal
It is connected；And
Second interval is less than the first interval.
2. anti-scatter grid as described in claim 1, which is characterized in that the thickness of the anti-scatter grid panel is less than the base
The width of seat.
3. anti-scatter grid as described in claim 1, which is characterized in that the pedestal protrudes from corresponding anti-scatter grid panel
Two sides.
4. anti-scatter grid as claimed in claim 3, which is characterized in that the width of at least part of side protrusion is not less than 20
μm。
5. anti-scatter grid as described in claim 1, which is characterized in that the anti-scatter grid panel is connected to the pedestal
Middle position.
6. anti-scatter grid as described in claim 1, which is characterized in that filling allows X-ray to pass through between the pedestal
Material.
7. anti-scatter grid as claimed in claim 3, which is characterized in that the width close to the pedestal at anti-scatter grid center is small
In the width for the pedestal for being located at anti-scatter grid two sides.
8. a kind of anti-scatter grid is set between X-ray emission source and detector, it is configured to removal scattering radiation, feature exists
In, comprising:
Anti-scatter grid unit limits multiple radiation paths between the anti-scatter grid unit, and the multiple radiation path makes
Radiation passes through and is incident on the detector；And
The anti-scatter grid unit is greater than the end face face towards the X-ray emission source towards the face area of the detector
Product.
9. anti-scatter grid as claimed in claim 8, which is characterized in that filling allows X between the anti-scatter grid unit
The material that ray passes through.
10. anti-scatter grid as claimed in claim 8, which is characterized in that the anti-scatter grid unit is " L " type or falls
T-shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721471902.9U CN209404801U (en) | 2017-11-07 | 2017-11-07 | A kind of anti-scatter grid |
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| CN201721471902.9U CN209404801U (en) | 2017-11-07 | 2017-11-07 | A kind of anti-scatter grid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984803A (en) * | 2021-10-28 | 2022-01-28 | 上海联影医疗科技股份有限公司 | Anti-scatter assembly, radiation imaging assembly and system |
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2017
- 2017-11-07 CN CN201721471902.9U patent/CN209404801U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984803A (en) * | 2021-10-28 | 2022-01-28 | 上海联影医疗科技股份有限公司 | Anti-scatter assembly, radiation imaging assembly and system |
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Address after: 201807 Shanghai City, north of the city of Jiading District Road No. 2258 Patentee after: Shanghai Lianying Medical Technology Co., Ltd Address before: 201807 Shanghai City, north of the city of Jiading District Road No. 2258 Patentee before: SHANGHAI UNITED IMAGING HEALTHCARE Co.,Ltd. |
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