CN210843120U

CN210843120U - Bed board, inspection bed assembly and medical imaging equipment for computed tomography

Info

Publication number: CN210843120U
Application number: CN201921305569.3U
Authority: CN
Inventors: 尚洪
Original assignee: Siemens AG
Current assignee: Siemens Shanghai Medical Equipment Ltd; Siemens AG
Priority date: 2019-08-13
Filing date: 2019-08-13
Publication date: 2020-06-26
Anticipated expiration: 2029-08-13

Abstract

The utility model discloses embodiment discloses a bed board, inspection bed subassembly and medical imaging equipment for computed tomography. A couch for computed tomography comprising: a first carbon fiber sheet; a second carbon fiber sheet; the first carbon fiber plate and the second carbon fiber plate are arranged in a stacked mode, a hollow cavity is formed between the first carbon fiber plate and the second carbon fiber plate, and the hollow cavity is located in a computed tomography area. The utility model discloses embodiment can improve the formation of image quality of bed board to the cost is practiced thrift.

Description

Bed board, inspection bed assembly and medical imaging equipment for computed tomography

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a bed board, inspection bed subassembly and medical imaging equipment for computed tomography.

Background

Computed Tomography (CT) uses a precisely collimated X-ray beam, gamma rays, ultrasonic waves, etc. to scan a cross section of a certain part of a human body one by one together with a detector having a very high sensitivity, has the characteristics of fast scanning time, clear images, etc., and can be used for the examination of various diseases. Depending on the radiation used, computed tomography scans can be classified as: x-ray computed tomography (X-CT), Ultrasound Computed Tomography (UCT), and gamma-ray computed tomography (gamma-CT), among others.

The bed board is an important part of the computed tomography imaging equipment, not only plays a role in bearing load, but also has a great influence on the image quality due to the ray transmission performance. At present, the upper surface and the lower surface of a bed board are generally made of carbon fiber prepreg, and high-strength foam is uniformly filled in the bed board to improve the bearing capacity.

However, the bonding process of the high-strength foam and the carbon fiber often has the defects of bubbles, wrinkles and the like with different sizes, and the defects can reduce the ray transmission performance, thereby having adverse effects on the imaging quality.

Moreover, high strength foam can increase the cost of the bed board.

SUMMERY OF THE UTILITY MODEL

The utility model discloses embodiment provides a bed board, inspection bed subassembly and medical imaging equipment for computed tomography.

The utility model discloses embodiment's technical scheme includes:

a couch for computed tomography comprising:

a first carbon fiber sheet;

a second carbon fiber sheet;

the first carbon fiber plate and the second carbon fiber plate are arranged in a stacked mode, a hollow cavity is formed between the first carbon fiber plate and the second carbon fiber plate, and the hollow cavity is located in a computer tomography area.

Therefore, the hollow cavity is arranged in the inner space of the bed plate between the first carbon fiber plate and the second carbon fiber plate, so that the using amount of high-strength foam can be reduced, the imaging capacity of the bed plate is improved, and the cost of the bed plate is reduced. Particularly, the area where the hollow cavity is located does not contain high-strength foam any more, so that the defects of bubbles, wrinkles and the like do not exist, and the imaging capacity of the bed board is further improved.

In one embodiment, further comprising:

a first high strength foam layer disposed at a first end of the second carbon fiber sheet;

a second high strength foam layer disposed at an opposite end of the first end of the second carbon fiber sheet;

wherein the first high-strength foam layer and the second high-strength foam layer are arranged at intervals, and the hollow cavity is formed between the first high-strength foam layer and the second high-strength foam layer.

Therefore, the high-strength foam is respectively arranged at the two ends of the bed plate, so that the load bearing capacity of the bed plate can be ensured.

In one embodiment, further comprising:

a first glue film layer arranged between the first carbon fiber plate and the first high-strength foam layer and between the first carbon fiber plate and the second high-strength foam layer;

and the second glue film layers are arranged between the second carbon fiber plate and the first high-strength foam layer and between the second carbon fiber plate and the second high-strength foam layer.

Therefore, the first high-strength foam layer and the second high-strength foam layer are respectively fixed on the second carbon fiber plate through the adhesive film, and industrial manufacturing can be facilitated.

In one embodiment, the first high strength foam layer includes an interface for receiving a head rest.

Thus, the first high strength foam layer may also include a head rest interface adapted to be inserted into a head rest.

In one embodiment, the second high strength foam layer includes spaced apart grooves having embedments disposed therein.

It can be seen that the strength and rigidity of the second high-strength foam layer can be increased by providing the grooves in which the embedded parts are arranged.

In one embodiment of the method of the present invention,

the couch plate includes a first end, a second end, and a middle portion between the first and second ends, the computed tomography area includes the second end and the middle portion, the hollow cavity is in the middle portion;

wherein the length interval of the hollow cavity is [0.8 m, 1.2 m ]; the length interval of the first end is [0.5 m, 1.1 m ]; the length interval of the second end is [0.12 meter, 0.18 meter ].

Thus, the hollow cavity is located between the second end (typically the head region of the patient) and the first end (typically the foot region of the patient), and is particularly suited to provide high quality imaging of the pelvic and abdominal regions of the patient.

A couch assembly for computed tomography comprising:

a bed plate as claimed in any one of the above;

a linear guide rail;

and the horizontal sliding mechanism is arranged at the lower part of the bed plate and is adapted to slide on the linear guide rail.

Medical imaging apparatus comprising a couch assembly as defined in any one of the above.

Drawings

Fig. 1 is an exemplary split structure diagram of a bed board for computed tomography according to an embodiment of the present invention.

Fig. 2 is an exemplary cross-sectional schematic view of a bed plate for computed tomography according to an embodiment of the present invention.

Fig. 3 is an exemplary schematic view of a formed bed plate for computed tomography according to an embodiment of the present invention.

Fig. 4 is an exemplary top view of a couch plate for computed tomography according to an embodiment of the present invention.

Fig. 5 is an exemplary block diagram of a table assembly for computed tomography according to an embodiment of the present invention.

Wherein the reference numbers are as follows:

reference numerals	Means of
		100	Bed board
101	A first carbon fiber plate
		102	Second carbon fiber plate
103	First high strength foam layer
		104	Second high strength foam layer
105	The first groove
		106	Second groove
107	First adhesive film layer
		108	Second adhesive film layer
109	Third adhesive film layer
		110	Interface
201	First end part
		202	Intermediate section
203	Second end portion
		204	Rivet
500	Inspection bed assembly
		501	Horizontal sliding mechanism
502	Linear guide rail

Detailed Description

In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.

For simplicity and clarity of description, the aspects of the present invention are described below by describing several representative embodiments. Numerous details of the embodiments are configured only to assist in understanding the aspects of the invention. It is clear, however, that the solution according to the invention can be implemented without being limited to these details. Some embodiments are not described in detail, but rather only to give a framework, in order to avoid unnecessarily obscuring aspects of the present invention. Hereinafter, "including" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention of chinese, the following description, when it does not specifically state the number of a component, means that the component may be one or more, or may be understood as at least one.

The couch plate for computed tomography has dual high requirements for imaging capacity and load bearing capacity.

In the interior of the bed plate of the prior art, a large amount of high-strength foam is uniformly filled to improve the load bearing capacity of the bed plate. The applicant found that: the defects of bubbles, folds and the like with different sizes are often generated in the combination process of the high-strength foam and the carbon fiber, so that the imaging capability of the bed plate is adversely affected.

In order to solve the technical problem, the applicant finds, through a great deal of research, that: by arranging the hollow cavity in the bed board, the using amount of high-strength foam can be reduced, the imaging capability of the bed board is improved, and the cost of the bed board is reduced. Further, the applicant has also found that: the high-strength foam is respectively arranged at the two ends of the bed plate, so that the load bearing capacity of the bed plate can be ensured.

Fig. 1 is a schematic view of a bed board for computed tomography according to an embodiment of the present invention.

As shown in fig. 1, the deck 100 includes:

a first carbon fiber sheet 101; wherein the first Carbon Fiber plate 101 comprises Carbon Fibers (CF) or a composite material (CFK) prepared using Carbon fibers;

a second carbon fiber sheet 102; wherein the second carbon fiber sheet 102 comprises carbon fibers or a composite material prepared using carbon fibers;

the first carbon fiber plate 101 and the second carbon fiber plate 102 are arranged in a stacked mode, a hollow cavity is formed between the first carbon fiber plate 101 and the second carbon fiber plate 102, and the hollow cavity is located in a computed tomography area.

The carbon fiber is a high-strength and high-modulus fiber material with the carbon content of more than 95%. The carbon fiber is a microcrystalline graphite material obtained by stacking organic fibers such as flaky graphite microcrystals along the axial direction of the fiber and performing carbonization and graphitization treatment. Carbon fibers have good radiopacity. Carbon fibers are added to materials such as resin, metal, ceramic, concrete and the like as reinforcing materials to form carbon fiber reinforced composite materials. Carbon fiber reinforced composites also have good radiopacity.

Therefore, the first carbon fiber sheet 101 including the carbon fiber or the composite material prepared using the carbon fiber has good radiation transmissivity. Likewise, the second carbon fiber sheet 102 comprising carbon fibers or a composite material prepared using carbon fibers also has good radiopacity.

A first carbon fiber sheet 101 and a second carbon fiber sheet 102 are arranged in layers to form (e.g., via a high temperature compression molding process) a bed deck 100. Firstly, the hollow cavity is contained between the first carbon fiber plate 101 and the second carbon fiber plate 102, so that the usage amount of high-strength foam can be remarkably reduced, and the cost of the bed board 100 can be reduced. Moreover, the hollow cavity in the computed tomography area has better radiolucency than the high strength foam, which also improves the imaging capabilities of the couch plate 100. In particular, the area where the hollow cavity is located does not contain high-strength foam any more, so that the defects of bubbles, wrinkles and the like do not exist, and the imaging capability of the bed plate 100 is further improved.

In one embodiment, the first carbon fiber plate 101 is implemented as a planar plate and the second carbon fiber plate 102 is implemented as an arc-shaped plate, wherein the corresponding center of the arc of the second carbon fiber plate 102 is located above the second carbon fiber plate 102, i.e., the second carbon fiber plate 102 is recessed downward. The first carbon fiber plate 101 is a surface plate of the bed plate 100, and the second carbon fiber plate 102 is a bottom plate of the bed plate 100. In the length direction of the bed board 100, two ends of a first carbon fiber board 101 in a planar board shape are fixed (for example, bonded via an adhesive film) with two corresponding ends of a second carbon fiber board 102 in an arc board shape; in the width direction of the bed board 100, both sides of the first carbon fiber plate 101 in a flat plate shape are fixed (e.g., bonded via an adhesive film) to corresponding both sides of the second carbon fiber plate 102 in an arc plate shape. The hollow cavity is formed in the inner space of the bed plate formed by the first carbon fiber plate 101 in the shape of a plane plate and the second carbon fiber plate 102 in the shape of an arc plate.

In another embodiment, the first carbon fiber plate 101 is implemented as an arc-shaped plate, and the second carbon fiber plate 102 is also implemented as an arc-shaped plate, wherein the corresponding center of the arc of the first carbon fiber plate 101 is located above the first carbon fiber plate 101, i.e., the first carbon fiber plate 101 is recessed downward, and the corresponding center of the arc of the second carbon fiber plate 102 is located above the second carbon fiber plate 102, i.e., the second carbon fiber plate 102 is also recessed downward. Further, the arc shape of the first carbon fiber sheet 101 and the arc shape of the second carbon fiber sheet 102 are concentric circles with each other. The first carbon fiber plate 101 and the second carbon fiber plate 102 which are concentric arcs have the advantage of easy integral molding. The first carbon fiber plate 101 in the shape of an arc plate is a surface plate of the bed plate 100, and the second carbon fiber plate 102 in the shape of an arc plate is a bottom plate of the bed plate 100. In the length direction of the bed board 100, two ends of the first carbon fiber board 101 in the shape of an arc are fixed (for example, bonded via an adhesive film) with two corresponding ends of the second carbon fiber board 102 in the shape of an arc; in the width direction of the bed board 100, both sides of the first carbon fiber plate 101 in the shape of an arc are fixed (e.g., bonded via an adhesive film) to corresponding both sides of the second carbon fiber plate 102 in the shape of an arc. The hollow cavity is formed in a bed board inner space formed by the arc-shaped first carbon fiber plate 101 and the arc-shaped second carbon fiber plate 102.

Considering that the provision of a hollow cavity may result in a limitation of the load bearing capacity of the bed deck 100, whereas the load bearing areas of the bed deck 100 are typically the ends of the bed deck, the applicant also proposes a preferred way to ensure the load bearing capacity of the bed deck 100.

In one embodiment, the deck 100 further comprises:

a first high strength foam layer 103 disposed at a first end of the second carbon fiber sheet 102;

a second high strength foam layer 104 disposed opposite the first end of the second carbon fiber sheet 102.

Wherein the first high strength foam layer 103 and the second high strength foam layer 104 are arranged at intervals, and the hollow cavity is formed between the first high strength foam layer 103 and the second high strength foam layer 104.

It can be seen that the embodiment of the present invention arranges the high strength foam layers in the opposite ends of the second carbon fiber plate 102, so as to compensate the load bearing capacity that may be affected by the hollow cavity. Moreover, the first high-strength foam layer 103 and the second high-strength foam layer 104 have a low elastic modulus, which has a good effect of absorbing and dispersing a shock impact load, and thus, the shock resistance of the deck 100 can be increased.

Preferably, the first high-strength foam layer 103 may be embodied as a Polymethacrylimide (PMI) foam or a Polyurethane (PU) foam. PMI foams are closed cell, rigid foams obtained by foaming a copolymer of methacrylic acid (MAA) and Methacrylonitrile (MAN). PU foam is a plastic made with polyurethane chemistry. Similarly, the second high strength foam layer 104 may be embodied as a PMI foam or a PU foam.

The above exemplary descriptions of the first high strength foam layer 103 and the second high strength foam layer 104 are exemplary, and those skilled in the art will appreciate that such descriptions are merely exemplary and are not intended to limit the scope of the embodiments of the present invention.

As shown in fig. 1, the first high strength foam layer 103 may also include an interface 110 for receiving a head rest. The interface 110 is preferably embodied as a U-shaped insertion notch. The second high strength foam layer 104 may extend partially beyond the second carbon fiber sheet 102. The portion extending beyond the second carbon fiber plate 102 is covered by the first carbon fiber plate 101 during the formation of the bed board, and the portion extending beyond the second carbon fiber plate 102 may be fixed to the horizontal sliding mechanism below the bed board 100 by a fixing means such as a rivet.

Preferably, the second high strength foam layer 104 may include spaced apart grooves with embedments disposed therein to further enhance load bearing capability. The number of the grooves can be one or more, and the embedded part is preferably a metal embedded part. The embedments may act as stiffeners and may increase the strength and rigidity of the second high strength foam layer 104.

For example, as shown in fig. 1, the second high-strength foam layer 104 includes a first groove 105 and a second groove 106 that are arranged at intervals in the width direction of the bed board 100, and metal embedments (e.g., aluminum embedments) are respectively arranged in the first groove 105 and the second groove 106.

The typical example of the second high-strength foam layer 104 is described above by taking the first groove 105 and the second groove 106 as examples, and those skilled in the art can appreciate that the number of grooves, the direction of the groove spacing arrangement, or the grooving direction can be adjusted according to the requirements of the specific application environment, and the embodiments of the present invention are not limited thereto.

The first high-strength foam layer 103 and the second high-strength foam layer 104 may be respectively fixed to the second carbon fiber sheet 102 by adhesive films.

As can be seen from fig. 2, the bed board 100 further includes:

a first adhesive film layer 107 disposed between the first carbon fiber sheet 101 and the first high-strength foam layer 103 and between the first carbon fiber sheet 101 and the second high-strength foam layer 104;

and a second adhesive film layer 108 disposed between the second carbon fiber sheet 102 and the first high-strength foam layer 103 and between the second carbon fiber sheet 102 and the second high-strength foam layer 104.

The first adhesive film layer 107 includes a first portion located on a first end side of the second carbon fiber sheet 102 and a second portion located on an opposite end side of the first end of the second carbon fiber sheet 102. A first portion of the first adhesive film layer 107 bonds the first carbon fiber sheet 101 to the first high strength foam layer 103 and a second portion of the first adhesive film layer 107 bonds an opposite end of the first carbon fiber sheet 101 to the second high strength foam layer 104.

The second glue film layer 108 includes a first portion located on a first end side of the second carbon fiber sheet 102 and a second portion located on an opposite end side of the first end of the second carbon fiber sheet 102. A first portion of the second film adhesive layer 108 bonds the second carbon fiber sheet 102 to the first high strength foam layer 103 and a second portion of the second film adhesive layer 108 bonds the second carbon fiber sheet 102 to the second high strength foam layer 104.

Preferably, the bed plate 100 further comprises:

and a third adhesive film layer 109 arranged between the first carbon fiber plate 101 and the second carbon fiber plate 102 for bonding and connecting the first carbon fiber plate 101 and the second carbon fiber plate 102.

Preferably, the first adhesive film layer 107, the second adhesive film layer 108, and the third adhesive film layer 109 are implemented as epoxy adhesive films. The epoxy resin adhesive film can be implemented as an epoxy resin soft adhesive film and an epoxy resin hard adhesive film. Wherein: taking dihydroxypropionic acid as a monomer, pentaerythritol as a core and toluene as a solvent, adding a catalyst A, and removing the solvent to obtain a hydroxyl-terminated hyperbranched polymer; adding a hydroxyl hyperbranched polymer and epoxy chloropropane into a reaction vessel, performing an open-loop reaction, adding a catalyst B, and performing a closed-loop reaction to obtain hyperbranched epoxy resin; mixing epoxy resin with hyperbranched epoxy resin, adding a curing agent, and preparing an epoxy resin adhesive film by a hot melting method; the catalyst A is p-toluenesulfonic acid or n-butyl titanate with the mass fraction of 2%; the catalyst B is a sodium hydroxide solution with the mass fraction of 10-20%.

The above exemplary descriptions of the first adhesive film layer 107, the second adhesive film layer 108 and the third adhesive film layer 109 are typical examples, and those skilled in the art will appreciate that such descriptions are merely exemplary and are not intended to limit the scope of the embodiments of the present invention.

Preferably, in the embodiment of the present invention, the first carbon fiber plate 101, the second carbon fiber plate 102, the first high-strength foam layer 103, the second high-strength foam layer 104, the first glue film layer 107, the second glue film layer 108 and the third glue film layer 109 can be integrally formed into the bed board 100 by using a high-temperature molding process in the prior art.

While the above exemplary manufacturing process for the bed plate is described, it will be appreciated by those skilled in the art that this description is merely exemplary and is not intended to limit the scope of embodiments of the present invention.

Fig. 3 is an exemplary schematic view of a formed bed plate for computed tomography according to an embodiment of the present invention. Fig. 4 is an exemplary top view of a couch plate for computed tomography according to an embodiment of the present invention.

As can be seen in fig. 4, the deck 100 includes a first end 201, a second end 203, and an intermediate portion 202 between the first end 201 and the second end 203. The first end part 201 is formed by the joint adhesion of the third adhesive film layer 109, the second part of the first adhesive film layer 107 and the second part of the second adhesive film layer 108, and is formed by the first carbon fiber plate 101, the second carbon fiber plate 102 and the second high-strength foam layer 104; the second end 203 is formed by the joint adhesion of the third adhesive film layer 109, the first part of the first adhesive film layer 107 and the first part of the second adhesive film layer 108, and is formed by the first carbon fiber plate 101, the second carbon fiber plate 102 and the first high-strength foam layer 103; the intermediate portion 202 is formed by bonding the first carbon fiber plate 101 and the second carbon fiber plate 102 via the third adhesive film layer 109.

Wherein the computed tomography area includes the second end 203 and the middle 202, and the hollow cavity inside the couch top 100 is in the middle 202. The first end 201 is a non-computed tomography area and includes a second high strength foam layer 104 that provides load bearing capability to the couch top 100. A plurality of rivets 204 are disposed on the first end 201. The first end 201 is fixed to a horizontal sliding mechanism under the deck 100 via rivets 204. The second end 203 includes a first high strength foam layer 103, which may also provide load bearing capability to the deck 100. An interface for receiving a head rest is also provided in the second end 203.

Preferably, the length interval of the hollow cavity is [0.8 meter, 1.2 meter ]; the length of the first end 201 is [0.5 m, 1.1 m ]; the length of the second end 203 is in the interval of 0.12 m, 0.18 m.

It can be seen that the hollow cavity is located between the second end 203 (typically the head region of the patient) and the first end 201 (typically the foot region of the patient), and is particularly suited to providing high quality imaging of the pelvic and abdominal regions of the patient. Moreover, the first end 201 and the second end 203, which are respectively arranged with respective high strength foam layers, may ensure the load bearing capacity of the bed sheet 100.

Based on the above description, the embodiment of the present invention further provides an examining table assembly for computed tomography.

As shown in fig. 5, the examination bed assembly 500 includes:

the bed board 100 shown in fig. 1 includes: a first carbon fiber sheet; the first carbon fiber sheet comprises carbon fibers or a composite material prepared from carbon fibers; a second carbon fiber sheet; the second carbon fiber sheet comprises carbon fibers or a composite material prepared from carbon fibers; the first carbon fiber plate and the second carbon fiber plate are arranged in a stacked mode, a hollow cavity is formed between the first carbon fiber plate and the second carbon fiber plate, and the hollow cavity is located in a computed tomography area;

a linear guide 502;

the horizontal sliding mechanism 501 is arranged at the lower part of the bedplate 100 and is adapted to slide on the linear guide rail 502.

Preferably, the bed plate 100 further comprises: a first high strength foam layer disposed at a first end of the second carbon fiber sheet; a second high strength foam layer disposed at an opposite end of the first end of the second carbon fiber sheet; wherein the first high-strength foam layer and the second high-strength foam layer are arranged at intervals, and the hollow cavity is formed between the first high-strength foam layer and the second high-strength foam layer.

Preferably, the bed plate 100 further comprises: the first glue film layers are arranged between the first carbon fiber plate and the first high-strength foam layer and between the first carbon fiber plate and the second high-strength foam layer; and the second glue film layer is arranged between the second carbon fiber plate and the first high-strength foam layer and between the second carbon fiber plate and the second high-strength foam layer.

Preferably, the horizontal sliding mechanism 501 may be implemented as a sliding plate.

It should be noted that not all the modules in the above structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Couch plate (100) for computed tomography, comprising:

a first carbon fiber sheet (101);

a second carbon fiber sheet (102);

wherein the first carbon fiber plate (101) and the second carbon fiber plate (102) are arranged in a stacked manner, and a hollow cavity is formed between the first carbon fiber plate (101) and the second carbon fiber plate (102) and is in a computed tomography area.

2. The couch board (100) for computed tomography according to claim 1, further comprising:

a first high strength foam layer (103) arranged at a first end of the second carbon fibre sheet (102);

a second high strength foam layer (104) disposed at an opposite end of the first end of the second carbon fiber sheet (102);

wherein the first high strength foam layer (103) and the second high strength foam layer (104) are arranged at a distance, the hollow cavity being formed between the first high strength foam layer (103) and the second high strength foam layer (104).

3. The couch board (100) for computed tomography according to claim 2, further comprising:

a first glue film layer (107) arranged between the first carbon fiber sheet (101) and the first high-strength foam layer (103) and between the first carbon fiber sheet (101) and the second high-strength foam layer (104);

a second glue film layer (108) arranged between the second carbon fiber sheet (102) and the first high strength foam layer (103) and between the second carbon fiber sheet (102) and the second high strength foam layer (104).

4. Bed slat (100) for computed tomography according to claim 2 or 3,

the first high strength foam layer (103) includes an interface (110) for receiving a head rest.

5. Bed slat (100) for computed tomography according to claim 2 or 3,

the second high strength foam layer (104) includes spaced apart grooves (105, 106), with embedments disposed in the grooves (105, 106).

6. The couch plate (100) for computed tomography according to any of claims 1-3,

the couch top (100) including a first end portion (201), a second end portion (203), and an intermediate portion (202) between the first end portion (201) and the second end portion (203), the computed tomography area including the second end portion (203) and the intermediate portion (202), the hollow cavity being in the intermediate portion (202);

wherein the length interval of the hollow cavity is [0.8 m, 1.2 m ]; the length interval of the first end (201) is [0.5 m, 1.1 m ]; the length interval of the second end (203) is [0.12 meter, 0.18 meter ].

7. Couch assembly (500) for computed tomography, comprising:

the bed sheet (100) of any of claims 1-6;

a linear guide (502);

the horizontal sliding mechanism (501) is arranged at the lower part of the bed plate (100) and is adapted to slide on the linear guide rail (502).

8. Medical imaging apparatus, characterized in that it comprises an examination table assembly (500) according to claim 7.