CN217853018U

CN217853018U - Filtering device for animal CT and animal CT

Info

Publication number: CN217853018U
Application number: CN202221548572.XU
Authority: CN
Inventors: 刘元杰; 尹春俊; 朱龙威
Original assignee: Wuhan Zhongke Medical Technology Industrial Technology Research Institute Co Ltd
Current assignee: Wuhan Zhongke Medical Technology Industrial Technology Research Institute Co Ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2022-11-22
Anticipated expiration: 2032-06-20

Abstract

The utility model relates to a filter and animal CT for animal CT. A filtration device for animal CT comprises: a support portion; a driving part disposed on the supporting part; the feed screw nut mechanism is connected with the driving part; the mounting part is slidably arranged on the supporting part, and the driving part drives the mounting part to reciprocate through the screw rod and nut mechanism; and a plurality of filter pieces, it is a plurality of the filter piece sets up on the installation department, it is a plurality of the filter piece is followed the moving direction of installation department interval arrangement in proper order, just the attribute of a plurality of filter pieces is different, wherein, the attribute includes material, thickness. The filtering device for animal CT can quickly and flexibly adjust the filtering effect.

Description

Filtering device for animal CT and animal CT

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a filter equipment and animal CT for animal CT.

Background

The animal CT (computed tomography) includes a gantry, a radiation source and a detector, which are oppositely disposed on the gantry. When an animal CT scans a scanned object, the scanned object is positioned between a ray source and a detector, and a ray bundle generated by the ray source penetrates through a scanned area of the scanned object. The detector is used for detecting the ray bundle passing through the scanned area of the scanned object, so that a CT image of the scanned area of the scanned object can be obtained according to a detection signal of the detector.

During the process of animal CT scanning the scanned object, many low energy rays exist in the ray beam generated by the ray source, and these low energy rays do not have any effect on the formation of CT image, but increase the exposure dose to the scanned object. Therefore, the animal CT further comprises a filtering device, which is disposed between the radiation source and the scanned object and is used for absorbing low-energy radiation in the radiation beam, so as to reduce the irradiation dose to the scanned object. And the filtering device can prevent the beam from hardening, so that the energy distribution of the beam passing through the scanned area of the scanned object is uniform.

However, conventional filtering devices for animal CT have difficulty in quickly and flexibly adjusting the filtering effect.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a filtering apparatus for animal CT and an animal CT, which can adjust the filtering effect quickly and flexibly, aiming at the problem that the conventional filtering apparatus for animal CT is difficult to adjust the filtering effect quickly and flexibly.

A filtration device for animal CT, the filtration device for animal CT comprising:

a support portion;

a driving part provided on the supporting part;

the feed screw nut mechanism is connected with the driving part;

the driving part drives the mounting part to reciprocate through the screw rod and nut mechanism; and

a plurality of filtration pieces, it is a plurality of the setting of filtration piece is in on the installation department, it is a plurality of the filtration piece is followed the moving direction of installation department interval arrangement in proper order, just the attribute of a plurality of filtration pieces is different, wherein, the attribute includes material, thickness.

In one embodiment, the mounting portion is provided with a plurality of transmission windows, and the filter sheets are disposed at the transmission windows, wherein the number of the transmission windows is greater than the number of the filter sheets.

In one embodiment, the area of the transmission window is smaller than the area of a projection area of a ray beam emitted by a ray source of the animal CT on the mounting part;

the distance between two adjacent transmission windows is larger than the width of a projection area of a ray bundle emitted by a ray source of the animal CT on the mounting part.

In one embodiment, the filtration device for animal CT further comprises:

the slide rail is arranged on the supporting part along the moving direction of the mounting part; and

the sliding part is in sliding fit with the sliding rail and is connected with the mounting part.

In an embodiment, the filtering device for animal CT further includes a limiting portion, the limiting portion is disposed on the supporting portion and is used for limiting the sliding portion, and the limiting portion is disposed on at least one side of the sliding portion along the moving direction of the mounting portion.

In one embodiment, the drive portion and the lead screw-nut mechanism are located on a first side of the support portion; the installation department the slide rail reaches the sliding part is located the second side of supporting part, wherein, the second side with first side is the opposite both sides of supporting part.

In one embodiment, the lead screw-nut mechanism is a ball screw-nut mechanism; and/or the presence of a gas in the gas,

the driving part is a motor.

In one embodiment, the output shaft of the driving portion is connected to a lead screw of the lead screw-nut mechanism, and the mounting portion is connected to a nut of the lead screw-nut mechanism.

In an embodiment, the filtering device for animal CT further comprises a coupler, and the driving part and the feed screw and nut mechanism are connected through the coupler.

An animal CT, comprising: the animal CT filtering device comprises a radiation source and a detector which are oppositely arranged, and any one of the animal CT filtering devices is used for being arranged between the radiation source and a scanned object.

The filtering device for animal CT and the animal CT are arranged between the ray source and the scanned object. The filter is used for filtering low-energy rays in a ray beam generated by the ray source. The driving part drives the feed screw nut mechanism to move so that the feed screw nut mechanism drives the mounting part to move, and the mounting part carries a plurality of filter discs to move synchronously. Because a plurality of filter pieces are arranged in proper order along the moving direction of installation department, consequently, the installation department carries a plurality of filter pieces synchronous motion's in-process, and a plurality of filter pieces can pass through bundle of rays in proper order. In the process that the installation part carries a plurality of filter pieces to move synchronously, the timing for controlling the driving part to stop driving is selected, so that any filter piece can be switched to filter the ray bundle, the filter pieces with different attributes can be selected to filter the ray bundle, and the filtering effect can be adjusted quickly and flexibly.

Drawings

FIG. 1 is a schematic diagram of a filtering apparatus for animal CT according to an embodiment;

FIG. 2 is a schematic view of another perspective of the filtration apparatus for animal CT of FIG. 1;

fig. 3 is a schematic view of another view of the filtering apparatus for animal CT in fig. 1.

Description of reference numerals:

a support portion 100;

a drive section 200; a coupling 210; a fixed base 220; a first portion 221; a second portion 222; a third portion 223;

a feed screw nut mechanism 300; a screw rod 310; the first support 311; a second support 312; a third support 313; a first support portion 3131; the second support portion 3132; a nut 320;

a mounting portion 400; a first connector 410; a transmissive window 420; a transmission window 420a provided with a filter sheet 500; the transmission window 420b where the filter sheet 500 is not disposed;

a filter sheet 500;

a slide rail 600;

a sliding part 700; a second connector 710; a first connection portion 711; a second connection portion 712;

a stopper 800; a third connecting member 810; a first connecting portion 811; a second connection portion 812.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Referring to fig. 1 to 3, one embodiment of the present application provides a filtering device for animal CT. The filtering device for animal CT comprises: a support portion 100, a driving portion 200, a lead screw-nut mechanism 300, a mounting portion 400, and a plurality of filter sheets 500. The driving part 200 is provided on the supporting part 100. The feed screw and nut mechanism 300 is connected to the drive unit 200. The mounting portion 400 is slidably disposed on the supporting portion 100. The mounting portion 400 is connected to the feed screw-nut mechanism 300. The driving unit 200 drives the mounting unit 400 to reciprocate through the lead screw and nut mechanism 300. The plurality of filter sheets 500 are provided on the mounting part 400, and the plurality of filter sheets 500 are sequentially arranged at intervals in the moving direction of the mounting part 400. The plurality of filter sheets 500 have different properties, wherein the properties include material and thickness. Since the attributes of the plurality of filter sheets 500 are different from each other, different filtering effects can be achieved.

The filtering device for the animal CT is arranged between a radiation source of the animal CT and a scanned object. The filter sheet 500 is used to filter out low energy radiation in the radiation beam generated by the radiation source. The driving part 200 drives the feed screw-nut mechanism 300 to move, so that the feed screw-nut mechanism 300 drives the mounting part 400 to move, and the mounting part 400 carries a plurality of filter sheets 500 to move synchronously. Since the plurality of filter sheets 500 are arranged in sequence along the moving direction of the mounting part 400, the plurality of filter sheets 500 can sequentially pass through the bundle of rays in the process of synchronously moving the mounting part 400 while carrying the plurality of filter sheets 500. In the process that the installation part 400 carries a plurality of filter sheets 500 to move synchronously, by selecting the time for controlling the driving part 200 to stop driving, the process can be switched to any filter sheet 500 to filter the ray bundle, namely, the filter sheets 500 with different attributes can be selected to filter the ray bundle, and then the filtering effect can be adjusted quickly and flexibly.

The scanned object may be an animal, and the scanned region of the scanned object may be a lesion region of the animal. The number of filter sheets 500 may be any number of two, three, etc.

The filter sheets 500 may be different from each other in material or thickness, or may be different in material and thickness.

The support part 100 may be a support plate. The mounting portion 400 may be a mounting plate.

In one embodiment, the driving unit 200 is a motor, and the filter sheet 500 is switched by driving the motor, so that the response is fast and the switching accuracy is high.

In one embodiment, the lead screw-nut mechanism 300 is a ball screw-nut mechanism, which provides high transmission accuracy.

Referring to fig. 1 to fig. 3, in an embodiment, an output shaft of the driving portion 200 is connected to a lead screw 310 of a lead screw-nut mechanism 300, and the mounting portion 400 is connected to a nut 320 of the lead screw-nut mechanism 300, that is, the driving portion 200 drives the lead screw 310 to rotate, so that the lead screw 310 drives the nut 320 to move, and the nut 320 drives the mounting portion 400 to move synchronously.

In other embodiments, the output shaft of the driving portion may be connected to a nut of the lead screw-nut mechanism, and the mounting portion may be connected to a lead screw of the lead screw-nut mechanism, that is, the driving portion drives the nut to rotate, so that the nut drives the lead screw to move, and the lead screw drives the mounting portion to move synchronously.

Referring to fig. 1 to 3, in an embodiment, the filtration apparatus for animal CT further includes a coupler 210, and the driving portion 200 is connected to the lead screw-nut mechanism 300 through the coupler 210.

Referring to fig. 1 to 3, in an embodiment, an output shaft of the driving portion 200 is connected to a lead screw 310 of a lead screw-nut mechanism 300 through a coupling 210.

Referring to fig. 1 to 3, in an embodiment, the filtration device for animal CT further includes a fixing base 220, the fixing base 220 is disposed on the support portion 100, and the driving portion 200 is mounted on the fixing base 220 and thus is indirectly disposed on the support portion 100.

Referring to fig. 1 to 3, in an embodiment, the filtration device for animal CT further includes a first support 311 and a second support 312, the first support 311 and the second support 312 are respectively disposed on the support portion 100, and the first support 311 and the second support 312 are respectively used for supporting two ends of the lead screw 310 of the lead screw-nut mechanism 300.

Referring to fig. 1 to 3, in an embodiment, the driving portion 200 and the first supporting member 311 are respectively disposed on the fixing base 220 and are thereby indirectly disposed on the supporting portion 100.

Referring to fig. 1 to 3, in an embodiment, the fixing base 220 includes a first portion 221, a second portion 222 disposed opposite to the first portion 221, and a third portion 223 connecting the first portion 221 and the second portion 222. The driving part 200 is mounted to the first part 221, and thus is indirectly provided to the supporting part 100. The first support 311 is mounted to the second portion 222 so as to be indirectly disposed on the support 100. The coupling 210 is located between the first portion 221 and the second portion 222. Thus, not only the driving part 200 and the first supporting member 311 are conveniently and indirectly disposed on the supporting part 100, but also the position of the coupling 210 is conveniently arranged and the structure is compact.

In one embodiment, the third portion 223 is attached and connected to the supporting portion 100, so as to facilitate disposing the fixing base 220 on the supporting portion 100.

Referring to fig. 1 to 3, in an embodiment, the filtering device for an animal CT further includes a third support 313, and the second support 312 is connected to the third support 313. The third supporting member 313 includes a first supporting portion 3131 and a second supporting portion 3132 which are arranged at a right angle, the first supporting portion 3131 is attached and connected to the supporting portion 100, and the second supporting member 312 is connected to the second supporting portion 3132, so that the second supporting member 312 is indirectly arranged on the supporting portion 100.

Referring to fig. 1-3, in one embodiment, the filtration device for animal CT further includes a first connector 410. The first connector 410 may be a connection plate. The mounting portion 400 is connected to the lead screw-nut mechanism 300 by a first connecting member 410. Specifically, one end of the first connecting member 410 is connected to the lead screw-nut mechanism 300, and the other end is connected to the mounting portion 400.

Referring to fig. 1 to 3, in an embodiment, the mounting portion 400 is connected to the nut 320 by a first connecting member 410.

Referring to fig. 1 to 3, in an embodiment, a plurality of transmission windows 420 are disposed on the mounting portion 400, and the filter 500 is disposed at the transmission windows 420.

Specifically, the plurality of transmission windows 420 are sequentially arranged at intervals in the moving direction of the mounting part 400. Each filter sheet 500 may be disposed at a different transmission window 420, respectively. The transmission window 420 penetrates the mounting portion 400, and the filter 500 mounted to the transmission window 420 can pass the radiation beam. By providing a transmissive window 420, installation of the filter sheet 500 is facilitated.

In one embodiment, the shape of the transmission window 420 is square, such that the beam may be defined to be square after passing through the transmission window 420, which serves to control the beam shape.

In other embodiments, the shape of the transmission window 420 may be circular or other shapes.

Referring to fig. 1 to 3, in one embodiment, the number of the transmission windows 420 is greater than the number of the filter sheets 500.

Since the filter sheet 500 is disposed at the transmission windows 420 and the number of the transmission windows 420 is greater than that of the filter sheet 500, only a portion of the transmission windows 420a is provided with the filter sheet 500; and the other part of the transmission window 420b is not provided with the filter sheet 500 and is a hollow window structure.

As shown in fig. 1, in the present embodiment, the transmission window 420b, in which the filter sheet 500 is not provided, is located at one side of the plurality of transmission windows 420a, in which the filter sheet 500 is provided, in the moving direction of the mounting part 400. The number of the transmission windows 420b where the filter sheet 500 is not disposed is one.

In the process of moving the mounting part 400 by driving the driving part 200, the timing for controlling the driving part 200 to stop driving can be selected so that the transmission window 420b without the filter sheet 500 is positioned at the position of the ray bundle, so that the ray bundle can directly transmit through the transmission window 420b without the filter sheet 500 to the scanned object, and thus, the animal CT can obtain a CT image obtained under the condition that the ray bundle is not filtered. The CT image obtained under the condition that the radiation beam is not filtered has strong contrast with the CT image obtained under the condition that the radiation beam is filtered by the filter 500, thereby facilitating the contrast and the study of the characteristics of the CT images obtained under the two different conditions.

In other embodiments, the transmission window 420b where the filter sheet 500 is not disposed may be disposed between two adjacent transmission windows 420a where the filter sheet 500 is disposed, or the transmission windows 420b where the filter sheet 500 is not disposed may be disposed on both sides of a plurality of transmission windows 420a where the filter sheet 500 is disposed in the moving direction of the mounting part 400, respectively. The number of the transmission windows 420b where the filter sheet 500 is not provided may be two or the like.

Referring to fig. 1, in one embodiment, the solid structure 421 between any adjacent transmission windows 420 is used to block the ray bundle, i.e. acts as a shutter.

It is understood that since the plurality of transmission windows 420 are sequentially arranged at intervals in the moving direction of the mounting part 400, any adjacent transmission windows 420 have a solid structure 421 therebetween. In the process of driving the installation part 400 to move by the driving part 200, the timing for controlling the driving part 200 to stop driving is selected, so that any solid structure 421 can be switched to shield the ray bundle, and the ray bundle can be shielded quickly and conveniently. When the ray bundle is needed in the scanning process, the ray bundle can be filtered through the filter 500; in the case of not using the radiation beam, the radiation beam can be blocked by switching the filtering sheet 500 to the solid structure 421, so that the irradiation dose to the scanned object in the scanning process can be reduced, and a special shutter is not required to be additionally arranged.

In an embodiment, the distance between two adjacent transmission windows 420 (i.e. the width of the solid structure 421) is greater than the width of the projection area of the radiation beam emitted by the radiation source of the animal CT on the mounting portion 400, so that the solid structure 421 can effectively block the radiation beam. Note that the width in the present embodiment refers to a dimension in the moving direction of the mounting portion 400.

In one embodiment, the area of the transmission window 420 is smaller than the area of the projection region of the radiation beam emitted from the radiation source of the animal CT on the mounting part 400, so that the transmission window 420 is located within the projection range of the radiation beam on the mounting part 400. In this manner, the transmission window 420 allows for beam shape control and energy filtering.

In an embodiment, the area of the transmission window 420 is sized such that an effective projection area of the radiation beam (emitted from the radiation source of the animal CT) projected onto the detector of the animal CT after passing through the transmission window 420 is equal to a receiving area of an effective receiving area of the detector of the animal CT, so that the radiation is projected into the effective receiving area of the detector, thereby improving the effective radiation absorption efficiency of the detector.

Preferably, the area of the transmission window 420 is sized such that an effective projection area of the radiation beam (emitted by the radiation source of the animal CT) projected onto the detector of the animal CT after passing through the transmission window 420 is larger than a receiving area of an effective receiving area of the detector of the animal CT, so that it can be further ensured that the radiation is projected into the effective receiving area of the detector, and the effective radiation absorption efficiency of the detector can be further improved.

Referring to fig. 1 to 2, in an embodiment, the filtering apparatus for animal CT further includes a slide rail 600 and a sliding portion 700. The slide rail 600 is provided to the support part 100 along the moving direction of the mounting part 400. The sliding part 700 is slidably engaged with the slide rail 600 and is connected to the mounting part 400, so that the engagement of the sliding part 700 with the slide rail 600 can guide the moving direction of the mounting part 400.

Referring to fig. 1 to 2, in an embodiment, the filtration device for animal CT further includes a second connector 710, and the sliding portion 700 is connected to the mounting portion 400 through the second connector 710.

In one embodiment, the second connector 710 is coupled to the first connector 410, and thus indirectly coupled to the mounting portion 400.

Referring to fig. 1 to 2, in an embodiment, the second connecting member 710 includes a first connecting portion 711 and a second connecting portion 712 disposed at an angle. The first connection part 711 is attached and connected to the sliding part 700, thereby facilitating the connection of the second connection part 710 to the sliding part 700. The second connecting portion 712 is connected with the mounting part 400.

Referring to fig. 1 to 2, in an embodiment, the second connecting portion 712 is attached to and connected with the first connecting member 410, so as to facilitate the connection between the second connecting member 710 and the first connecting member 410.

Referring to fig. 1 to 3, in an embodiment, the filtering device for an animal CT further includes a limiting portion 800, wherein the limiting portion 800 is disposed on the supporting portion 100 and is used for limiting the sliding portion 700, so as to prevent the sliding portion 700 from being separated from the sliding rail 600 toward the direction of the limiting portion 800. The sliding portion 700 is provided with a stopper 800 at least on one side in the moving direction of the mounting portion 400.

The slide rail 600 is provided with a limiting portion 800 on either side of the moving direction of the mounting portion 400, or the slide rail 600 is provided with a limiting portion 800 on both sides of the moving direction of the mounting portion 400.

Referring to fig. 1 to 3, in an embodiment, the filtering device for an animal CT further includes a third connecting member 810, the third connecting member 810 includes a first connecting portion 811 and a second connecting portion 812 disposed at an angle, and the first connecting portion 811 is attached and connected to the supporting portion 100, so that the third connecting member 810 is conveniently connected to the supporting portion 100. The second connecting portion 812 is connected to the stopper 800.

Referring to fig. 1 to 3, in an embodiment, the second side and the first side are opposite sides of the supporting portion 100. The driving part 200 and the lead screw nut mechanism 300 are positioned on the first side of the supporting part 100, and the mounting part 400, the sliding rail 600 and the sliding part 700 are positioned on the second side of the supporting part 100, so that the structure of the filtering device for the animal CT is compact, and the whole size is small, so that the filtering device can be used for research on smaller isolated tissues and small animals.

An embodiment of the present application also provides an animal CT. Animal CT includes: the animal CT filtering device comprises a radiation source and a detector which are oppositely arranged, and any one of the animal CT filtering devices is used for being arranged between the radiation source and a scanned object.

In one embodiment, the animal CT includes a gantry. The ray source and the detector are respectively arranged on the stand. A filtration device for animal CT may be disposed on the frame.

The animal CT is used for arranging the filtering device between the ray source and the scanned object. The filter sheet 500 is used to filter out low energy radiation in the radiation beam generated by the radiation source. The driving part 200 drives the feed screw and nut mechanism 300 to move, so that the feed screw and nut mechanism 300 drives the mounting part 400 to move, and the mounting part 400 carries a plurality of filter sheets 500 to move synchronously. Since the plurality of filter sheets 500 are arranged in sequence along the moving direction of the mounting part 400, the plurality of filter sheets 500 can sequentially pass through the bundle of rays in the process of synchronously moving the mounting part 400 while carrying the plurality of filter sheets 500. In the process that the installation part 400 carries a plurality of filter sheets 500 to move synchronously, by selecting the time for controlling the driving part 200 to stop driving, the process can be switched to any filter sheet 500 to filter the ray bundle, namely, the filter sheets 500 with different attributes can be selected to filter the ray bundle, and then the filtering effect can be adjusted quickly and flexibly.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A filter device for animal CT, characterized in that, the filter device for animal CT comprises:

a support part (100);

a driving part (200), the driving part (200) being provided on the supporting part (100);

a feed screw and nut mechanism (300), the feed screw and nut mechanism (300) being connected to the drive section (200);

a mounting part (400), wherein the mounting part (400) is arranged on the supporting part (100) in a sliding way, and the driving part (200) drives the mounting part (400) to reciprocate through the feed screw and nut mechanism (300); and

a plurality of filtration pieces (500), it is a plurality of filtration piece (500) sets up on installation department (400), it is a plurality of filtration piece (500) are followed the moving direction of installation department (400) is interval arrangement in proper order, just the attribute of a plurality of filtration pieces (500) is mutually different, wherein, the attribute includes material, thickness.

2. The filtration device for animal CT according to claim 1, wherein a plurality of transmission windows (420) are provided on the mounting portion (400), the filter sheet (500) being provided at the transmission windows (420), wherein the number of transmission windows (420) is larger than the number of filter sheets (500).

3. The filtering device for animal CT according to claim 2, characterized in that the distance between two adjacent transmission windows (420) is larger than the width of the projection area of the ray beam emitted by the ray source of the animal CT on the mounting part (400).

4. The animal CT filtering device of claim 1, further comprising:

a slide rail (600), the slide rail (600) being provided to the support portion (100) along a moving direction of the mounting portion (400); and

sliding part (700), sliding part (700) with slide rail (600) sliding fit, and with installation department (400) are connected.

5. The animal CT filtering device according to claim 4, further comprising a limiting part (800), wherein the limiting part (800) is arranged on the support part (100) and is used for limiting the sliding part (700), and the limiting part (800) is arranged on at least one side of the sliding part (700) along the moving direction of the mounting part (400).

6. Filtering device for animal CT according to claim 4, characterized in that said drive portion (200) and said screw-nut mechanism (300) are located on a first side of said support portion (100); the installation department (400), slide rail (600) reach sliding part (700) are located the second side of supporting part (100), wherein, the second side with first side is the opposite both sides of supporting part (100).

7. The filtration device for animal CT of claim 1,

the feed screw and nut mechanism (300) is a ball feed screw and nut mechanism; and/or the presence of a gas in the gas,

the driving part (200) is a motor.

8. The animal CT filtering device according to claim 1, wherein the output shaft of the driving part (200) is connected to a lead screw (310) of the lead screw-nut mechanism (300), and the mounting part (400) is connected to a nut (320) of the lead screw-nut mechanism (300).

9. The animal CT filtration device according to claim 1, further comprising a coupling (210), wherein the drive part (200) and the screw-nut mechanism (300) are connected by the coupling (210).

10. An animal CT, comprising: a radiation source and a detector which are oppositely arranged, and the filtering device for animal CT as claimed in any one of claims 1-9, wherein the filtering device for animal CT is arranged between the radiation source and a scanned object.