JPH0698873A - Subject carrier mechanism for bed for mri - Google Patents

Abstract

PURPOSE:To enable effective utilization of an internal capacity of a receiving coil by supporting deflection of a subject carrier base of a bed for MRI with a pin to reduce the volume of the carrier base. CONSTITUTION:A magnet 1 is provided and a magnetostatic field space 2 is generated with the magnet 1. A subject 3 lies on a second top board 4, a receiving coil 5 is provided wrapping the second top board 4 and the subject 3 from below a carrier base and a truck 7 with the receiving coil 5 thereon is provided in a space 6 under the second top board 4. A pin 8 for preventing deflection of the second top board 4 as caused by the weight of the subject 3 is provided on a bed body top board 9 picking out to the space 6 therebelow. The receiving coil 5 is placed on the truck 7 and can move to a measuring part of the subject 3. When the subject 3 and the carrier base are wrapped in the finite internal capacity of the receiving coil 5, the volume of the carrier base is reduced to expand the selection of the subject 3. But any reduction in the volume of the carrier base causes shortage of strength to let the carrier base deflect and to prevent this deflection, the carrier base is supported with the pin 8 thereby allowing compensation for the insufficiency of the strength.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subject placement mechanism of a bed for MR imaging equipment (hereinafter referred to as MRI).

[0002]

2. Description of the Related Art In commonly used MRI, a table on which a subject is placed is made of a rigid body which is not flexible. Therefore, the mounting table becomes a thick rigid body,
Both weight and volume are increasing.

[0003]

In MRI, the internal volume of a coil that receives a nuclear magnetic resonance signal is finite, and the measurement site of the subject (in this case, the torso portion) and the subject are contained therein. If the second top plate to be placed is included together, the second
The smaller the proportion of the top plate, the greater the proportion of the subject. Therefore, it becomes necessary to thin the second top plate. If the wall thickness is made thin, the rigidity of the second top plate becomes poor and the bending becomes large. Therefore, the problem is how to prevent it from bending even if it becomes thin.

[0004]

In order to achieve the above object, a pin for preventing the second top plate from bending is provided.

If the pin is fixed in a fixed state, it will hinder the movement of the carriage. Therefore, the problem could be solved by using a mechanism in which the pin changes the direction from the vertical direction to the horizontal direction as the carriage moves.

[0006]

In order to prevent the bending of the second top plate on which the subject is placed, a plurality of pins are provided in the space between the second top plate and the bed body. The pin has a shaft rotatably provided at an intermediate portion in the longitudinal direction of the pin so that the pin can rotate about the shaft. One end of the pin supports the second top plate and the other end is attached with an object having a large specific gravity to form a weight. Therefore, the weight always remains stationary with the lower side facing upward and the opposite side facing upward. Therefore, when a load is applied on the second top plate, the top plate bends but is supported by the tips of the pins.

In addition, the movement of the carriage causes the second movement by the carriage.
The top plate is pushed up, and at the same time, the pin is pushed down horizontally, so that it does not interfere with the movement of the truck. As the dolly passes, the pin changes its direction vertically by itself (restoring force) and at the same time supports the second top plate.

[0008]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram conceptually showing the system configuration of the entire MRI to which the subject placing mechanism according to the present invention is applied.

In FIG. 1, there is a magnet 1 and a static magnetic field space 2 generated by the magnet 1. The subject 3 is lying on the second top plate 4, and the receiving coil 5 is provided from below the mounting table 4 to include the second top plate 4 and the subject. In the lower space 6 of the second top plate 4, there is a carriage 7.

The pin 8 for preventing the second top plate 4 from bending is projected into the space of the lower space 6 while being provided on the main body top plate 9 of the bed body.

In this configuration, the second top plate 4 is bent by the weight of the subject 3 but is supported by the carriage 7 or the pin 8, and the receiving coil 5 is placed on the carriage 7. It is possible to move to the measurement site of the subject 3.

FIG. 2 is a conceptual diagram showing the relationship among the second top plate 4, the carriage 7 and the pins 8.

In FIG. 2, one end of the second top plate 4 is supported by a hinge mechanism, and the other end thereof is in the state of both supporting beams supported by both ends, the second top plate 4 and the main body top plate. The space between 9 is a space.

The carriage 7 can freely move within the space of the lower space 6.

The pin 8 for preventing the second top plate 4 from bending is rotatably provided on the main body top plate 9 by a shaft 10.

One end of the pin 8 prevents the second top plate 4 from bending and at the same time a weight 11 is provided at the other end, and the weight 11 is always on the lower side with the shaft 10 as a fulcrum. 3 and 4 are conceptual diagrams showing the functions of the pin 8 and the carriage 7.

In FIG. 3, when the carriage 7 moves in the direction of the horizontal arrow and comes into contact with the pin 8, the pin 8 rotates about the shaft 10 in the direction of the arcuate arrow while the carriage 7 further moves. As shown in FIG. 4, the pin 8 is buried in the main body top plate 9 and does not hinder the movement of the carriage 7.

When the carriage 7 passes over the pin 8, the pin 8
Rises by itself (restoring force), turns vertically,
It functions to prevent the top plate 4 from bending.

A single pin 8 or a plurality of pins 8 may be provided.

The pin 8 is a spring in addition to being restored by itself.
There is also a method of restoring using a panel panel, a coil spring, a rubber cord, etc., but the present invention is simple and better. Although the pin 8 is provided in the main body top plate 9 in the present invention, it may be provided in the second top plate 4, but this is not a good idea because it goes against the purpose of thinning the second top plate.

[0022]

As described above, according to the present invention, when the subject and its mounting table are contained in the finite inner volume of the receiving coil, it is necessary to reduce the volume of the mounting table. Can expand the choice of workers.

However, reducing the volume of the mounting table causes a problem in that the strength is insufficient.

In the present invention, by supporting the mounting table with a pin in order to prevent bending of the mounting table due to insufficient strength,
The shortage of strength, which is the drawback, was compensated for.

It should be noted that the simplest method is to use the restoring force due to its own weight, so that the occurrence rate of failures is small, and the subject placing mechanism of the MRI bed is optimal in terms of manufacturing cost. It is a thing.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an entire system of a subject placement mechanism of an MRI bed according to the present invention.

FIG. 2 is a conceptual diagram showing a relationship between a second top plate 4, a carriage 7 and a pin 8.

FIG. 3 is an explanatory view of a mechanism of a pin 8.

FIG. 4 is an explanatory view of a mechanism of a pin 8.

[Explanation of symbols]

1 ... Magnet, 2 ... Static field space, 3 ... Subject, 4 ... Second top plate,
5 ... Receiving coil, 6 ... Space, 7 ... Truck, 8 ... Pin, 9 ...
Main body top plate, 10 ... Shaft, 11 ... Weight.

Claims (5)

[Claims] 1. In an MRI that performs image diagnosis, chemical measurement, and blood flow measurement using a nuclear magnetic resonance phenomenon, a space is provided below a mounting table (hereinafter referred to as a second top plate) on which a subject is mounted. A mechanism for placing a subject on an MRI bed, wherein a mechanism for preventing the second top plate from bending is provided in the space. 2. The subject placement mechanism for an MRI bed according to claim 1, wherein the member for preventing the second top plate from bending is constituted by a rigid pin. 3. The rigid pin according to claim 2, wherein the second top plate is prevented from bending, and the receiving coil (hereinafter referred to as a probe) is moved to the space by mounting the probe on a measurement site of the subject. An MRI bed subject mounting mechanism having a structure that does not hinder the movement of a probe mounting table (hereinafter referred to as a trolley). 4. The rigid pin according to claim 3, which prevents the second top plate from bending, changes its direction in the horizontal direction by the movement of the dolly, and changes its direction in the vertical direction while the dolly passes over the pin of the rigid body. A subject placement mechanism for an MRI bed, which is characterized by being restored. 5. The subject placement mechanism for an MRI bed according to claim 4, wherein a weight is provided at one end of the rigid pin as a mechanism for maintaining the rigid pin in the vertical direction at all times.