JPH09131340A - Bed for examinee, and medical image diagnosis device using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize space in a diagnosis device room by composing an upper part of a main body for supporting a top plate to be longitudinally movable along its length in such a way that it can be expanded/contracted in top plate moving directions. SOLUTION: A device is provided with a lower part main body 6' having a specified bottom surface area to be installed on a floor surface, and an upper part main body 8' provided at an upper end part of the lower part main body 6' and composed to be capable of expansion/contraction only along length in a horizontal plane. It is also provided with a top plate 3 on an upper surface of the upper part main body 8' to be extended along its length as a plate for a specified length to be longitudinally movable along the length for having an examinee on an upper surface of it. Required surface for a bed 4 for the examinee when the top plate 3 is moved forward can thus be reduced to effectively utilize space in a diagnosis device room.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bed for a subject for placing the subject on a table and feeding it into the measurement space of a medical image diagnostic apparatus for positioning, and particularly, for moving the table vertically in the longitudinal direction thereof. The present invention relates to a bed for a subject in which an upper part of a supportable body is expandable / contractible in a moving direction of the top plate and a space in a diagnostic apparatus room can be effectively used, and a medical image diagnostic apparatus using the same.

[0002]

2. Description of the Related Art Generally, a medical image diagnostic apparatus such as a digital X-ray fluoroscopic apparatus, an X-ray CT apparatus or an MRI apparatus is
As shown in FIG. 6, the diagnostic apparatus main body 1 and the bed 4 in which the bed main body 2 and the top plate 3 are combined are provided and installed in the diagnostic apparatus room 5 having an appropriate area. The diagnostic apparatus main body 1 includes, for example, an information carrier generating unit that generates an information carrier that penetrates into a subject placed in a measurement space, and an inside of the subject that is brought by the information carrier that penetrates into the subject. The information carrier detection unit for detecting the information carrier reflecting the tissue property of, and the image processing unit for image processing the detection signal detected by this information carrier detection unit, and the image signal generated by this image processing unit. The image is sent to the image display unit and displayed as an image. Also, sleeper 4
Is configured to vertically move the top plate 3 on which the subject is laid down into the measurement space as shown by an arrow A and to feed the top plate 3 to the measurement space.

The concrete structure of the bed 4 of such a medical image diagnostic apparatus is as shown in FIGS. 7 and 8.
That is, in FIG. 7, the bed main body 2 is the lower main body 6
And a lateral movement part 7 and an upper body 8. First, the lower body 6 has a predetermined bottom area and is installed on the floor to move the upper body 8 up and down.
And a pantograph in which the first link 10a and the second link 10b are combined in a cross shape, and a hydraulic cylinder 11 for driving the pantograph. Note that reference numeral 12
Indicates the drive source of the hydraulic cylinder 11. One ends of the first link 10a and the second link 10b are rotatably supported by pins 13a and 13b, respectively, and the other ends thereof are rollers 14a and 14b and guide plates 15a and 15 respectively.
With b, the position is stopped while sliding in the directions of arrows C and D. Then, by expanding and contracting the rod of the hydraulic cylinder 11, for example, the intermediate portion of the second link 10b is pushed and pulled to operate the pantograph, and the operation of the pantograph causes the upper main body 8 to move up and down. .

Next, the lateral movement part 7 is provided at the upper end of the lower body 6 to laterally move the upper body 8 in a horizontal direction in a direction perpendicular to its longitudinal direction. A linear guide 17 having an intermediate member 16 fixed at the upper ends of the links 10a and the second links 10b via pins 13a and rollers 14b, and a guide rail fixed at a right angle to the longitudinal direction of the upper body 8. ，
17, a motor 18 as a drive source for lateral movement fixed to a part of the intermediate member 16, a pinion 19 rotated by this motor, and a rack 20 fixed to a part of the upper main body 8 and engaged with the pinion 19. And a drive mechanism provided. Then, the pinion 19 is rotated by rotationally driving the motor 18, and the rack 20 meshing with the pinion 19 is linearly moved in the lateral direction.
The upper main body 8 to which 0 is coupled is laterally moved by the guides of the linear guides 17, 17.

Further, the upper main body 8 is provided on the upper surface of the lateral moving portion 7 and supports the top plate 3 above it.
For example, two parallel frame members 21a, 21b are connected by a plurality of plate members 22, 22, ... In a bridging manner, and can be laterally moved in the horizontal plane by the lateral movement section 7.

Further, in FIG. 8, the top plate 3 is provided above the upper main body 8 configured as shown in FIG. 7 so as to be vertically movable only along the longitudinal direction thereof. That is, as shown in FIG. 8A, the two frame members 21
Plate members 22 and 22 at both ends in the longitudinal direction connecting a and 21b
Sprocket 23, 23 is rotatably provided on the sprocket 23, and a chain 24 is hung around the sprocket 23, 23.
Is fixed, and the top plate 3 is attached to the upper end of the top plate fixing portion 25 in the form of a plate having a predetermined length in the horizontal plane. A plurality of rollers (not shown) are provided between the frame members 21a and 21b and the back surface of the top plate 3 to prevent the top plate 3 from bending. And FIG.
As shown in (b), the rotational driving force of the motor 26 is applied to the one sprocket 23, for example, the electromagnetic clutch 2
7 is transmitted, the chain 24 is rotated and the top plate 3 is moved through the top plate fixing portion 25 so that the top plate 3 has arrows A and B (see FIG. 8).
(See (a)).

[0007]

However, in the bed 4 in such a conventional medical image diagnostic apparatus, as shown in FIG.
As shown in FIG. 5, the upper body 8 has a certain length, and only the top plate 3 on which the human body (subject) is laid is arranged above the upper body 8 along the longitudinal direction of the upper body 8 by the arrow A, Since it was designed to move vertically as shown in FIG. 6B, the top plate 3 is moved vertically from the bed 4 located in front of the diagnostic apparatus body 1 in FIG. After being sent to the measurement space, the bed main body 2 remains positioned in front of the diagnostic apparatus main body 1 in the original length. In this case, since the upper main body 8 of the bed main body 2 is located within the diagnostic device room 5 with a certain length, the space in the diagnostic device room 5 is always occupied by that amount, and the space is effectively used. It will not be possible. Therefore, as shown in FIG. 6, when the diagnostic device room 5 is not so wide and the bed main body 2 reaches near the side wall of the diagnostic device room 5, the operator moves from one side of the bed main body 2 to the other side. Was sometimes hindered.

Particularly, in recent years, interventional radiology (hereinafter referred to as "IV
A treatment method using a catheter called “R” is abundantly performed. In this IVR procedure, for example, when there is an infarction in an annular artery and this is treated, a catheter is inserted from the aorta or the like, the catheter is advanced to a target blood vessel under fluoroscopy, and a balloon catheter is inserted at the target site. And atherectomy catheter are used to open the narrowed part of the blood vessel. In such an IVR procedure, it is necessary to find a target blood vessel under fluoroscopy and quickly insert a catheter into the target blood vessel. For that purpose, the image capturing system and the support mechanism are moved under fluoroscopy. It was necessary to move or move the top plate 3. During such an operation, the operator moves around the bed 4, but this operation may be obstructed by the bed body 2 shown in FIG. 6, and the operability in the IVR procedure or the like may deteriorate.

Therefore, the present invention addresses such a problem, and the upper part of the main body for supporting the top plate so as to be vertically movable in the longitudinal direction thereof is made expandable and contractable in the moving direction of the top plate. An object of the present invention is to provide a bed for a subject capable of effectively utilizing the above and a medical image diagnostic apparatus using the same.

[0010]

In order to achieve the above object, a bed for a subject according to the present invention has a lower main body having a predetermined bottom area and installed on a floor surface, and an upper end portion of the lower main body. And an upper main body that is configured to be expandable and contractible only in the longitudinal direction in a horizontal plane, and extends on the upper surface of the upper main body in a plate shape for a predetermined length along the longitudinal direction and moves vertically along the longitudinal direction. And a top plate on which the subject is laid down.

The upper body is combined with a fixing member fixed to the upper end of the lower body and having a predetermined length so as to be reciprocally slidable in a longitudinal plane of the fixing member.
It may be composed of a step or a plurality of steps of slide members.

Further, the upper body may be attached to the upper end of the lower body so as to be laterally movable in a direction perpendicular to the longitudinal direction of the top plate.

Furthermore, in the upper body, the one or a plurality of slide members may be slid in accordance with the vertical movement operation of the top plate by utilizing the driving force of a drive source for vertically moving the top plate. Good.

Further, the medical image diagnostic apparatus as a related invention of the bed for a subject has an information carrier generating section for generating an information carrier penetrating into the subject placed in a measurement space, and an inside of the subject. An information carrier detection unit that detects an information carrier that reflects the tissue properties in the subject brought by the penetrated information carrier, and an image processing unit that performs image processing on the detection signal detected by this information carrier detection unit,
An image display unit that displays the image signal generated by this image processing unit as an image, and a top plate that lays the subject in the measurement space are vertically moved and fed, and the subject on the top plate is positioned in the measurement space. In the medical image diagnostic apparatus including a bed, the bed for a subject according to any one of the means is used as the bed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a partially exploded perspective view showing an embodiment of a bed 4'for a subject according to the present invention. The bed 4'for the subject is constructed by placing the subject on a top plate and using a digital X-ray fluoroscope or an X-ray CT apparatus, M.
The medical image diagnostic apparatus such as an RI apparatus is fed into the measurement space for positioning, and is composed of a bed main body 2'and a top plate 3 as shown in FIG.

The bed main body 2'supports the top plate 3 vertically above it, and in FIG. 1, it has a lower main body 6'and an upper main body 8 '. First, the lower body 6 '
A pantograph having a predetermined bottom area, which is installed on the floor to vertically move the upper body 8 ', and which has a base 9 having a predetermined area and a first link 10a and a second link 10b combined in an intersecting manner. , And a hydraulic cylinder 11 for driving this pantograph. One ends of the first link 10a and the second link 10b have pins 13a, 1 respectively.
3b is rotatably attached to the shaft, and the other end is roller 1 respectively.
4a, 14b and the guide plates 15a, 15b indicate arrows C, D
The position is stopped while sliding in the direction. By expanding and contracting the rod of the hydraulic cylinder 11, for example, the upper end of the first link 10a is pushed and pulled to operate the pantograph, and the operation of the pantograph causes the upper main body 8'to move up and down. There is.

Next, the upper body 8'is the lower body 6 '.
Is provided at the upper end of the above and supports the top plate 3 above it, and is configured to be expandable / contractible only in the longitudinal direction in a horizontal plane. That is, the upper body 8'includes a fixing member 28 having a predetermined length fixed to the upper end of the lower body 6 ',
The fixing member 28 is composed of two stages of slide members 29 and 30 which are combined so as to be reciprocally slidable in the longitudinal plane. In the fixing member 28, two parallel frame members 31a and 31b having a U-shaped cross section are arranged with their U-shaped openings facing each other inwardly, and their both ends are connected by connecting plates 32 and 32. The frame member 3
A stopper 33 is provided inside the base end portions of 1a and 31b. In addition, the first slide member 29 includes two parallel rod members 34a and 34b in the shape of the frame member 31a,
31b are arranged inside, and both ends thereof are connected by connecting plates 35, 35, and further, the above-mentioned bar members 34a, 34b
Rollers 36, 36 are provided on the outer surface of the base end of the
In addition, rollers 37, 37 are provided on the inner surface of the tip portion thereof, respectively. Then, the rollers 36, 36 provided on the outer side surface of the base end portion roll inside the U-shaped openings inside the frame members 31a, 31b, so that they can be reciprocally slidable in the longitudinal direction of the fixing member 28. ing.
Further, the second slide member 30 has two parallel frame members 38a, 38b having a U-shaped cross section arranged inside the rods 34a, 34b with their U-shaped openings facing each other. Connecting both ends of the plate 39,3
The frame members 38a and 38b are connected to each other by a stopper 9, and a stopper 40 is provided outside the tip end portions of the frame members 38a and 38b. The rollers 37, 37 provided on the inner side surfaces of the tips of the rods 34a, 34b roll in the U-shaped openings on the outside of the frame members 38a, 38b, so that the length of the first slide member 29 increases. It can slide back and forth in any direction.

The engagement state of the fixing member 28, the first slide member 29, and the second slide member 30 is as shown in the sectional view of FIG. That is, focusing on the left end side in FIG. 2, the pin 41 can freely rotate the U-shaped opening facing inward at the frame member 31a of the fixing member 28 to the outer surface of the bar member 34a of the first slide member 29. The roller 36 at the base end portion rotatably engaged with the roller 3 at the tip end portion rotatably provided by the pin 42 on the inner surface of the bar member 34a of the first slide member 29.
7 is rotatably engaged in the outwardly facing U-shaped opening at the frame member 38a of the second slide member 30. Then, the fixing member 28 and the first slide member 2
Since 9 and the second slide member 30 are formed symmetrically, they are in the same engaging state on the right end side in FIG. As a result, the first slide member 29 can be reciprocally slid within the longitudinal surface of the fixed member 28, and the second slide member 30 can be reciprocally slid within the longitudinal surface of the first slide member 29. It is said that.

A top plate 3 is provided on the upper surface of the upper body 8'of the bed body 2 ', as shown in FIG. The top plate 3 has a top surface on which a subject is laid, and extends on the top surface of the upper main body 8'in a plate shape with a predetermined length along the longitudinal direction and moves vertically along the longitudinal direction. Only possible. That is, as shown in FIG. 2, deflection preventing roller groups 43, 43, ... Are provided on the lower surface of the top plate 3, and the fixing member 28 and the first slide member 29 and the second slide member 30 are provided. The upper surface is rotatably slidably in contact with each other. Then, as shown in FIG. 1, a top plate fixing member 45 is attached downward to the lower surface of one end of the top plate 3 with a bolt 44, and as shown in FIG. Roller 47 with pin 46,
47 is rotatably provided, and these rollers 47, 4
7 is a cross section L in which the upper ends of columns 48, 48 standing on the upper surface of the connecting plate 39 of the second slide member 30 are attached.
It is slidably slidably in contact with the lower ends of the guide metal fittings 49, 49. As a result, the roller group 43, 43, ... And the rollers 47, 47 are rotated between the sliding members, and the top plate 3 is provided so as to be vertically movable along the longitudinal direction of the upper main body 8 '. There is. A stopper 50 is attached to the base end of the guide fitting 49 as shown in FIG.

Further, the upper body 8'uses the driving force of the driving source for vertically moving the top plate 3 as described above, and the above-mentioned 2
The step slide members 29, 30 are adapted to slide in accordance with the vertical movement operation of the top plate 3. First, referring to FIG. 3, the top plate 3 is driven by a motor 51 provided below the upper main body 8'at an appropriate position on the lower main body 6 ', and a sprocket 52 mounted on the rotary shaft of the motor 51.
And a pinion 55 rotatably supported by a pin 54 between columns 53, 53 standing up on the connecting plate 32 of the fixing member 28 of the upper main body 8 ', and fixed to the pin 54 of the pinion 55. The sprocket 56, the chain 57 wound around the sprocket 56 and the sprocket 52, and the bottom surface of the top plate 3 provided linearly along the longitudinal direction thereof as shown in FIG. The drive mechanism is composed of a pinion 55 and a rack 58 that meshes with the pinion 55. Then, the sprocket 52 is rotated by the rotational driving of the motor 51, this rotation is transmitted to another sprocket 56 via the chain 57, and the pinion 55 rotates, and the rotation of the pinion 55 causes the rack 58 that meshes with the pinion 55. Moves linearly, and the top plate 3 moves vertically as shown by arrows A and B in FIG. At this time, the stoppers 33, 40, provided on the ends of the fixing member 28 and the first slide member 29 and the second slide member 30, etc., according to the vertical movement operation of the top plate 3 in the directions of arrows A and B, respectively. The respective members 28, 29, 30 are sequentially slid or stopped by 50 or the like.

Next, the operation of the top plate 3 and the upper body 8'having the above-mentioned structure will be described. First, in FIG. 1, it is assumed that the first slide member 29 and the second slide member 30 of the main body 8'extend to the most front side in the longitudinal direction of the fixing member 28, and the second slide member It is assumed that the top plate 3 provided on the upper surface of the member 30 also moves in the direction of the arrow B and is located at the frontmost side. In this state, the motor 51 shown in FIG. 3 is rotationally driven, and the pinion 5 is passed through the sprocket 52, the chain 57, and the other sprocket 56.
By rotating 5 and linearly moving the rack 58 that meshes with the pinion 55, the top plate 3 moves in the direction of arrow A. By the movement of the top plate 3 in the direction of arrow A, the guide plate fittings 49, 4 on which the top plate fixing member 45 is located on both sides in FIG.
9 and a stopper 50 provided at the base end thereof.
Hit. When the motor 51 shown in FIG. 3 is driven to rotate as it is, the stopper 50 is pushed by the top plate fixing member 45, whereby the second slide member 30 moves in the arrow A direction. By the movement of the second slide member 30 in the direction of arrow A, the stopper 40 provided at the tip of the second slide member 30 is provided on the inner side surface of the tip of the first slide member 29. It hits the roller 37. Further, when the motor 51 shown in FIG. 3 is rotated as it is, the stopper 50 is pushed by the top plate fixing member 45 and the roller 37 is pushed by the stopper 40, whereby the first slide together with the second slide member 30 is pushed. The member 29 moves in the direction of arrow A. Then, the first slide member 29 moves in the direction of arrow A as it is, and finally the roller 36 provided on the outer surface of the base end portion of the first slide member 29 is attached to the base end portion of the fixing member 28. It stops by hitting the stopper 33 provided inside.

As a result, as shown in FIG. 4, the top plate 3 first moves as indicated by the arrow A ₁ , then the second slide member 30 moves together with the top plate 3 as indicated by the arrow A ₂ , and After that, the first slide member 29 moves together with the top plate 3 and the second slide member 30 as shown by an arrow A ₃ . As a result, the top plate 3 moves by a distance of (A ₁ + A ₂ + A ₃ ) and sends the subject into the measurement space, and accordingly the upper main body 8 ′ contracts in the moving direction A of the top plate 3 in sequence. And finally shortens until it is almost equal to the length of the fixing member 28 only. Therefore, the area occupied by the subject bed 4'is reduced.

On the other hand, in order to move the top plate 3 in the direction of the arrow B to return the subject from the measurement space to the outside, it is sufficient to move it in the reverse order of the above operation. That is, in FIG. 3, when the motor 51 is rotationally driven in the reverse direction, the top plate 3 first moves in the reverse direction as shown by the arrow B ₁ and then the second slide member 30 moves. The top plate 3 moves with the arrow B ₂ , and then the first slide member 29 moves with the top plate 3 and the second slide member 30 as the arrow B ₃ . As a result,
The top plate 3 is moved by a distance of (B ₁ + B ₂ + B ₃ ) to return the subject from the measurement space to the outside, and accordingly, the upper main body 8 ′ is sequentially extended in the moving direction B of the top plate 3. Finally, as shown in FIG. 1, the length is increased until it becomes equal to the total length of the fixed member 28, the first slide member 29, and the second slide member 30. Therefore, the subject's bed 4 '
Returns to its original state.

In FIG. 1, a horizontal moving portion is not provided between the lower main body 6'and the upper main body 8 ', but like the conventional example shown in FIG. The upper main body 8'may be attached to the upper end of the lower main body 6'movably laterally in a direction perpendicular to the longitudinal direction of the top plate 3. Further, in FIG. 1, the lower main body 6 '
Has a pantograph in which the first link 10a and the second link 10b are combined and is configured to be vertically movable, but it is not necessarily required to be vertically movable. Further, in the above description, the upper main body 8'has the two-stage slide members 29 and 30, but the present invention is not limited to this, and the slide member may have only one stage, or three or more stages. The slide member may be provided.

FIG. 5 is a plan view showing the overall construction of a medical image diagnostic apparatus as a related invention of the subject's bed 4'shown in FIG. This medical image diagnostic apparatus is provided with a gantry having a measurement space into which a subject is inserted, such as a digital X-ray fluoroscope, an X-ray CT apparatus, or an MRI apparatus, and is particularly applicable to the above-mentioned IVR procedure. Is. As shown in FIG. 5, the medical image diagnostic apparatus includes a diagnostic apparatus main body 1 and a bed 4'combined with a bed main body 2'and a top plate 3, and inside the diagnostic apparatus room 5 having an appropriate area. It is installed in. The diagnostic apparatus main body 1 includes, for example, an information carrier generating unit that generates an information carrier that penetrates into a subject placed in a measurement space, and an inside of the subject that is brought by the information carrier that penetrates into the subject. The information carrier detection unit for detecting the information carrier reflecting the tissue property of, and the image processing unit for image processing the detection signal detected by this information carrier detection unit, and the image signal generated by this image processing unit. The image is sent to the image display unit and displayed as an image. Further, the bed 4 ′ is adapted to vertically move the top plate 3 on which the subject is laid in the measurement space as shown by an arrow A and to feed the top plate 3 to the measurement space in the measurement space. .

Here, in the present invention, the bed 4 '
As shown in FIG. 1, an upper part of a bed main body 2'which supports the top plate 3 so as to be vertically movable in the longitudinal direction thereof, and an upper part of the bed main body 2'is extendable in the moving direction of the top plate 3 '. Is used. With such a configuration, in the medical image diagnostic apparatus shown in FIG. 5, when the patient bed 4'is driven to move the table 3 in the direction of arrow A, the upper body of the bed body 2'according thereto is moved. 8 '(see FIG. 1) sequentially moves as shown by arrow E and contracts. At this time, when the top plate 3 is most advanced in the direction of arrow A, the bed main body 2 '
As shown by the solid line, contracts to a length of only the slack fixing member 28 in FIG. 1 to form a space in the space inside the diagnostic device chamber 5. Therefore, by utilizing this vacant space, the surgeon is not much hindered from moving around the bed 4'by the bed 4 ', and the operability in the IVR procedure or the like is improved. When the top plate 3 is moved in the direction of arrow B from this state, the upper main body 8'of the bed main body 2'is sequentially moved and extended as indicated by the arrow F accordingly. At this time, when the top plate 3 is most retracted in the direction of arrow B,
The bed main body 2'extends to a length substantially the same as the top plate 3 as shown by the chain line, and returns to the original state.

[0027]

EFFECT OF THE INVENTION A bed for a subject according to the present invention (see FIG. 1)
Since it is configured as described above, the upper main body of the bed main body that supports the tabletop so as to be vertically movable in the longitudinal direction of the tabletop can be expanded and contracted in the moving direction of the tabletop. It is possible to reduce the occupied area of the subject bed and effectively use the space in the diagnostic device room.

Further, since the medical image diagnostic apparatus (see FIG. 5) as the related invention is constructed as described above, the upper main body of the bed main body which supports the tabletop as the bed so as to be vertically movable in the longitudinal direction thereof. By using the subject couch that is capable of expanding and contracting in the moving direction of the couchtop, the couch body contracts when the couchtop on which the test subject is laid is advanced and inserted into the measurement space of the diagnostic device. As a result, a space is formed in the space inside the diagnostic device room. Therefore, by utilizing this vacant space, the operator can improve the operability in the IVR procedure or the like without much obstruction of the movement around the bed by the bed.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view showing an embodiment of a bed for a subject according to the present invention.

FIG. 2 is a transverse cross-sectional view of an upper main body of the bed main body cut along a central portion thereof.

FIG. 3 is a transverse cross-sectional view of the upper body, similarly cut along the base end portion thereof.

FIG. 4 is a perspective view of an essential part showing a state where the upper body and the top plate are operated and the upper body is contracted most.

5 is a plan explanatory view showing an overall configuration of a medical image diagnostic apparatus as a related invention of the subject's bed shown in FIG. 1. FIG.

FIG. 6 is an explanatory plan view showing an overall configuration of a conventional medical image diagnostic apparatus.

FIG. 7 is a partially exploded perspective view showing a bed of a conventional medical image diagnostic apparatus.

FIG. 8 is an explanatory view of a main part showing an upper main body and a drive mechanism of a top plate in the bed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 diagnostic apparatus main body 2'bed main body 3 top plate 4'subject bed 5 diagnostic apparatus room 6'lower main body 7 lateral moving section 8'upper main body 28 fixing member 29 first slide member 30 second slide member 51 heaven Motors for vertical movement of plates 52, 56 Sprocket 55 Pinion 57 Chain 58 Rack

Claims (5)

[Claims] 1. A lower main body having a predetermined bottom area and installed on a floor surface, and an upper main body which is provided at an upper end portion of the lower main body and is configured to extend and contract only in a longitudinal direction in a horizontal plane, A top plate which extends on the upper surface of the upper main body in a plate shape with a predetermined length along the longitudinal direction thereof and which is vertically movable along the longitudinal direction and on which the subject lies down. A bed for a subject characterized by the above. 2. The upper body comprises a fixing member fixed to the upper end of the lower body and having a predetermined length, and one or more steps combined so as to be reciprocally slidable in the longitudinal plane of the fixing member. The couch for a subject according to claim 1, wherein the couch comprises a slide member. 3. The bed according to claim 1, wherein the upper main body is attached to the upper end of the lower main body so as to be laterally movable in a direction perpendicular to the longitudinal direction of the top plate. 4. The upper body uses a driving force of a driving source for vertically moving a top plate so that the one-stage or a plurality of stages of slide members slide in accordance with a vertical movement operation of the top plate. The bed for a subject according to claim 2 or 3. 5. An information carrier generating section for generating an information carrier penetrating into a subject placed in a measurement space, and a tissue property in the subject brought by the information carrier penetrating into the subject. An information carrier detection unit that detects the reflected information carrier, an image processing unit that performs image processing on the detection signal detected by this information carrier detection unit, and an image display unit that displays the image signal generated by this image processing unit as an image And a bed for vertically moving and sending a top plate on which the subject is laid in the measurement space and positioning the subject on the top plate in the measurement space. Item 4. A medical image diagnostic apparatus using the subject's bed according to any one of items 1 to 4.