CN211022731U - CT grid and CT apparatus - Google Patents
CT grid and CT apparatus Download PDFInfo
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- CN211022731U CN211022731U CN201922030928.5U CN201922030928U CN211022731U CN 211022731 U CN211022731 U CN 211022731U CN 201922030928 U CN201922030928 U CN 201922030928U CN 211022731 U CN211022731 U CN 211022731U
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Abstract
The utility model relates to the field of medical equipment, particularly, relate to a CT grid and CT equipment. The CT grid comprises a plurality of filter sheets, and the adjacent filter sheets are stacked in sequence; the filtering sheet is provided with a plurality of filtering holes which are distributed in a grid shape and penetrate through; the number of the filter holes of each filter sheet is the same; the filtering holes of the adjacent filtering sheets are in one-to-one correspondence, and a plurality of filtering holes are positioned at the same corresponding position and are encircled to form a ray channel; the intersection of the central lines of the plurality of ray channels coincides with the focal point of the tube sphere. The grid structure is stable, the precision is high, the absorption rate of scattered rays is improved, and the final imaging quality is further improved.
Description
Technical Field
The utility model relates to the field of medical equipment, particularly, relate to a CT grid and CT equipment.
Background
The grid is an important component of a CT apparatus and is mainly disposed at the front end of a crystal for receiving X-rays. It is known that X-rays emitted from a tube bulb generate strong scattered rays after passing through a measured object, which seriously affects the image quality. The grid plays a role in shielding scattered rays and improving image quality.
At present, a grid is mostly composed of supports and grid pieces (tungsten steel pieces or other materials with high X-ray absorption rate), wherein the grid pieces are arranged between the supports, each grid piece is focused at one point, and channels between the grid pieces correspond to an X-ray receiving unit in a crystal. However, the grid is simple in structure, the grid pieces are arranged between the supports in an approximately parallel mode, deformation is easily caused, the distance between the grid pieces is affected, and further image quality is affected.
At present, some manufacturers also produce a two-dimensional grid through methods such as 3D printing and electric spark, and some manufacturers adopt a structure of mutually perpendicular grid pieces. However, the grid has disadvantages, and the 3D printing and spark firing processing methods have high process costs. The problem that the vertical grid structure cannot realize bidirectional centripetal is that the vertical grid structure generally adopts two groups of grid structures which are mutually vertical.
SUMMERY OF THE UTILITY MODEL
The utility model aims at including, for example, provide a CT grid and CT equipment, it can provide stable in structure, the higher grid of precision, improves the absorption rate to the scattered ray simultaneously, further improves ultimate image quality.
The embodiment of the utility model discloses a can realize like this:
in a first aspect, an embodiment of the present invention provides a CT grid, which is used in cooperation with a tube and a ball of a CT apparatus, including:
a plurality of stacked filter sheets, adjacent ones of which are stacked in sequence;
each filter sheet is provided with a plurality of filter holes which are distributed in a grid shape and penetrate through; the number of the filter holes of each filter sheet is the same;
the filtering holes of any two adjacent filtering sheets are in one-to-one correspondence, and a plurality of filtering holes in the same corresponding position are encircled to form a ray channel;
an intersection of the centerlines of a plurality of the ray channels, the intersection configured to coincide with a focal point of the tube sphere.
In an alternative embodiment, adjacent filter pores are parallel to each other on the same filter sheet.
In an alternative embodiment, the filter holes are parallelogram shaped.
In alternative embodiments, the filter holes are diamond shaped or rectangular.
In an alternative embodiment, the filter sheet is made of tungsten steel material.
In an alternative embodiment, the CT grid further comprises supports on which the filter foils are each arranged.
In an alternative embodiment, the inner wall of the filter hole is obliquely arranged;
the opening of the filter hole close to the focus is small, the opening far away from the focus is large, and the opening of the filter hole is larger the farther away from the focus;
the ray channel forms an inclined channel with a flat inner wall.
In an alternative embodiment, the radiation channels form a centripetal quadrangular pyramid pointing towards the focal spot.
In an alternative embodiment, the inner wall of the filter hole is straight;
the opening of the filter hole close to the focus is small, the opening far away from the focus is large, and the opening of the filter hole is larger the farther away from the focus;
the ray channel forms an inclined channel with a preset inclined angle.
In a second aspect, embodiments of the present invention provide a CT apparatus, which includes the CT grid of any one of the foregoing embodiments.
The utility model discloses beneficial effect includes, for example:
the utility model aims at providing a CT grid which comprises a plurality of filtering sheets which are stacked in sequence, a plurality of filtering holes are arranged on the filtering sheets, and a plurality of filtering holes at the same corresponding position are enclosed to form a ray channel; the intersection point of the central lines of the ray channels is coincident with the focus of the tube ball. The combined assembly mode of the CT grid is more convenient, and the inner wall of the ray channel is airtight, so that the absorption rate of scattered rays is better. To sum up, the embodiment of the utility model provides a new stable in structure, the higher grid of precision improves the absorption rate to the scattered ray simultaneously, further improves final image quality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a diagram illustrating the relationship between an X-ray focus and a grid and a crystal in the prior art;
fig. 2 is a schematic structural diagram of a unidirectional shielding grid in the prior art;
fig. 3 is a schematic view of the structure of a two-dimensional grid-form grid of the prior art;
fig. 4 is a schematic diagram of a first structure of a CT grid according to the present embodiment;
fig. 5 is a schematic diagram of a second structure of the CT grid according to the present embodiment;
fig. 6 is a schematic diagram of a third structure of the CT grid according to the present embodiment;
fig. 7 is a schematic diagram of a fourth structure of the CT grid according to the present embodiment.
Icon: 11-a grid; 12-a crystal; 100-grid; 101-a support; 102-a grid sheet; 200-a grid; 300-a grid; 301. 302, 303-filter sheet; 400-grid; 401. 402, 403-filter sheet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated device or element must have a specific position, be constructed and operated in a specific orientation, and thus, should not be interpreted as a limitation of the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
FIG. 1 is a diagram illustrating the relationship between an X-ray focus and a grid and a crystal in the prior art. As shown in the figure: the grid 11 and the crystal 12 are uniformly arranged on an arc with the tube focus as the center, and the X-ray is emitted from the tube focus and finally reaches the crystal 12 receiving the X-ray through the grid 11. Since X-rays generate a lot of scattered rays after passing through the object to be measured, which affects the image quality, it is necessary to fan the slits of the grid 11 to the tube focus in order to filter out unwanted scattered rays.
Fig. 2 is a schematic structural diagram of a conventional unidirectional shielding grid, as shown in the figure: the grid 100 is composed of a support 101 and a grid 102, but can only shield the scattered rays in the X direction, and cannot effectively shield the scattered rays in the Z direction, and a large amount of scattered rays are absorbed by the crystal, thereby affecting the image.
Fig. 3 is a schematic structural diagram of a conventional two-dimensional grid-type grid, as shown in the figure: the grid 200 shields scattered rays in both the X direction and the Z direction, but since the length of the grid 200 in the Y direction is much longer than the size of the grid, it is difficult to machine and form the grid, and the accuracy is poor.
In order to overcome the above problem, a CT grid and a CT apparatus are provided in the following embodiments.
Example 1
Referring to fig. 4, the present embodiment provides a CT grid 300 for cooperating with a tube of a CT apparatus, which includes a plurality of stacked filter sheets 301, 302, 303.
A plurality of adjacent filter sheets 301, 302, 303 are stacked in sequence;
each filter sheet 301, 302, 303 has a plurality of filter holes distributed in a grid-like manner; the number of filter holes of each filter sheet 301, 302, 303 is the same;
the filtering holes of any two adjacent filtering sheets 301, 302 and 303 are in one-to-one correspondence, and a plurality of filtering holes at the same corresponding position are encircled to form a ray channel;
an intersection of the centerlines of the plurality of ray channels, the intersection configured to coincide with a focal point of the tube sphere.
The CT grid 300 includes a plurality of filter sheets 301, 302, 303 stacked in sequence, the filter sheets 301, 302, 303 are provided with a plurality of filter holes, and the plurality of filter holes at the same corresponding position surround to form a ray channel; the intersection of the central lines of the plurality of ray channels coincides with the focal point of the tube sphere. The combined assembly mode of the CT grid 300 is more convenient, the inner wall of a ray channel is airtight, the absorption rate of scattered rays is better, and the final imaging quality is further improved.
Please continue to refer to fig. 4 to 5 for further details.
In the present embodiment, adjacent filter sheets 301, 302, and 303 are fixed together by bonding or the like to constitute a grid 300 main body. It should be noted that, in other embodiments, the connection manner of the adjacent filter sheets 301, 302, 303 may also be welding, and the like, which is merely an example.
In an alternative embodiment, the filter sheets 301, 302, 303 are made of tungsten steel material. It should be noted that, here, only the material of tungsten steel is used for illustration, and in other embodiments, the tungsten steel sheet may be replaced by other material with high X-ray absorption.
In an alternative embodiment, the CT grid 300 further comprises a support on which the filter foils 301, 302, 303 are arranged. The support may be made of any material and shape, as long as it is a structure that can fix the filter sheets 301, 302, and 303.
In an alternative embodiment, adjacent filter holes are parallel to each other in the same filter sheet 301, 302, 303. Optionally, the filter holes are parallelogram shaped. Furthermore, the filtering holes are rhombic or rectangular.
In this embodiment, filter the hole and be a plurality of quad slit of arranging of array in proper order, and a plurality of filtration holes are rectangle array in proper order and are arranged.
Furthermore, the sizes of each grid type filter sheet 301, 302 and 303 are different, and the inner walls of the filter holes are obliquely arranged; the opening of the filtering hole close to the focus is small, the opening far away from the focus is large, and the opening of the filtering hole is larger as the distance from the focus is farther; the ray channel forms an inclined channel with a flat inner wall.
When these mesh- like filter sheets 301, 302, 303 are superimposed, a centripetal quadrangular pyramid pointing towards the focal point of the tube sphere is thus formed. This space of the quadrangular pyramid can be regarded as the path of the X-rays. Finally, the intersection point of the central lines of all the ray channels is coincided with the tube sphere focus.
The embodiment of the utility model also provides a CT equipment, CT equipment includes any one of the CT grid 300 of the aforesaid embodiment. The CT device has high imaging quality and less image interference.
Example 2
The present embodiment provides a CT grid 400, which is substantially the same as the CT grid 300 of embodiment 1, except that the inner walls of the filter holes of the filter sheets (401, 402, 403, etc.) in the present embodiment are arranged straight;
the opening of the filtering hole close to the focus is small, the opening far away from the focus is large, and the opening of the filtering hole is larger as the distance from the focus is farther;
the ray passage forms an inclined passage with a preset inclined angle.
Please continue to refer to fig. 6 to 7 for further details.
Further, different filter sheets are bonded together through a tool according to the order of the sizes of the edge grids. The grid of filter foils (401, 402, 403, etc.) need not have an oblique angle, but the channels formed by them have a certain oblique angle, and finally the intersection of the centre lines of the channels coincides with the tube sphere focus. The CT grid has the characteristics of easy processing, low cost and good economic benefit.
The embodiment of the utility model also provides a CT equipment, CT equipment includes the CT grid of any one of the aforesaid embodiment. The CT device has high imaging quality and less image interference.
The utility model discloses beneficial effect includes, for example:
the utility model aims at providing a CT grid which comprises a plurality of filtering sheets which are stacked in sequence, a plurality of filtering holes are arranged on the filtering sheets, and a plurality of filtering holes at the same corresponding position are enclosed to form a ray channel; the intersection of the central lines of the plurality of ray channels coincides with the focal point of the tube sphere. The combined assembly mode of the CT grid is more convenient, and the inner wall of the ray channel is airtight, so that the absorption rate of scattered rays is better. To sum up, the embodiment of the utility model provides a new stable in structure, the higher grid of precision improves the absorption rate to the scattered ray simultaneously, further improves final image quality.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A CT grid for use with a tube globe of a CT apparatus, comprising:
a plurality of stacked filter sheets;
each filter sheet is provided with a plurality of filter holes which are distributed in a grid shape; the number of the filter holes of each filter sheet is the same;
the filtering holes of any two adjacent filtering sheets are in one-to-one correspondence, and a plurality of filtering holes are positioned at the same corresponding position and are encircled to form a ray channel;
a plurality of centerlines of the ray channels have an intersection point configured to coincide with a focal point of the tube sphere.
2. CT grid according to claim 1, characterized in that:
on the same filter sheet, the adjacent filter holes are parallel to each other.
3. CT grid according to claim 1, characterized in that:
the filtering holes are in a parallelogram shape.
4. A CT grid according to claim 3, characterized in that:
the filtering holes are rhombic or rectangular.
5. CT grid according to claim 1, characterized in that:
the filtering sheet is made of tungsten steel material.
6. CT grid according to claim 1, characterized in that:
the CT grid also comprises a support, and the filter sheets are arranged on the support.
7. CT grid according to any of claims 1-6, characterized in that:
the inner wall of the filtering hole is obliquely arranged;
the opening of the filter hole close to the focus is small, the opening of the filter hole far away from the focus is large, and the opening of the filter hole is larger the farther away from the focus;
the ray channel forms an inclined channel with a flat inner wall.
8. CT grid according to claim 7, characterized in that:
the ray channels form a centripetal quadrangular pyramid pointing towards the focal spot.
9. CT grid according to any of claims 1-6, characterized in that:
the inner walls of the filtering holes are arranged straightly;
the opening of the filter hole close to the focus is small, the opening of the filter hole far away from the focus is large, and the opening of the filter hole is larger the farther away from the focus;
the ray channel forms an inclined channel with a preset inclined angle.
10. A CT apparatus, characterized by:
the CT device comprises a CT grid according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922030928.5U CN211022731U (en) | 2019-11-20 | 2019-11-20 | CT grid and CT apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922030928.5U CN211022731U (en) | 2019-11-20 | 2019-11-20 | CT grid and CT apparatus |
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| Publication Number | Publication Date |
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| CN211022731U true CN211022731U (en) | 2020-07-17 |
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| CN201922030928.5U Active CN211022731U (en) | 2019-11-20 | 2019-11-20 | CT grid and CT apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977966A (en) * | 2020-08-04 | 2020-11-24 | 深圳市安健科技股份有限公司 | Two-dimensional grid and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977966A (en) * | 2020-08-04 | 2020-11-24 | 深圳市安健科技股份有限公司 | Two-dimensional grid and manufacturing method thereof |
| CN111977966B (en) * | 2020-08-04 | 2022-09-13 | 深圳市安健科技股份有限公司 | Two-dimensional grid and manufacturing method thereof |
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