JPH0440939A - Mri device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an MRI apparatus in which the wiring structure of a signal line for transmitting a signal from a receiving probe to the outside is improved.

(Prior Art) An MRI apparatus (magnetic resonance diagnostic apparatus) used for diagnosing the inside of a human body consists of a bed, a table movably provided on the bed on which a subject is placed, and a top plate for placing a patient on the bed. It is equipped with a gantry that applies a magnetic field and a receiving probe that is placed on the top plate and receives information from the subject who is exposed to the magnetic field by the gantry, and applies the magnetic field to the subject who is on the gantry or the top plate. The receiving probe receives the signal emitted by the subject who is exposed to the magnetic field produced by the gantry, and the signal received by the receiving probe is image-processed by a signal processing circuit to observe the inside of the subject's body as an image. It has been made possible.

Therefore, in an MRI apparatus, in order to transmit the signal output from the receiving probe to a signal processing circuit provided separately from the MRI apparatus, the signal line for signal output connected to the receiving probe is drawn out to the outside of the MRI apparatus. and connected to the signal processing circuit.

Conventionally, in order to lead out the signal line of the receiving probe to the outside of the MRI apparatus, the following configuration has been adopted.

One method is to install a stationary connector on the gantry, connect the signal line drawn out from the reception probe placed on the top plate to the connector provided on the gantry, and then connect the output signal line to this connector to perform MRI. It is connected to the output signal processing circuit outside the device.

In addition, as another configuration, a moving body that moves along the moving direction of the top plate is provided on the gantry, a connector is provided on this moving body, and a signal line drawn out from a receiving probe arranged on the top plate is connected to the moving body. In some cases, the signal line is connected to a connector provided in the MRI apparatus, and a signal line for arching is connected to this connector to be drawn out to the outside of the MRI apparatus and connected to a signal processing circuit.

(Problems to be Solved by the Invention) However, the above-described conventional configuration for leading the signal line of the receiving probe to the outside of the MRI apparatus has the following problems.

The problems with the former configuration are as follows.

When performing a diagnosis, the top plate on which the subject is placed is moved inside the cylindrical gantry, and when the diagnosis is completed, the top plate is moved to the outside of the gantry. For this reason, there is a risk that the signal wire wired between the receiving probe placed on the top plate and the connector installed on the gantry may get caught on the top plate, gantry, or the patient when the top plate moves, causing the wire to break. .

The signal line wired between the reception probe placed on the top plate and the connector installed on the gantry is located above the top plate, so the patient sitting on the top plate may come into contact with the signal line. It's easy to do. When a subject comes into contact with a signal line, the signal current flowing through the signal line may drop and the identity of the pixel may become unclear.

The problems with the latter configuration are as follows.

Since a movable body is required to be installed on the gantry and a configuration for movably holding this movable body on the gantry, the number of parts installed in the device increases, the configuration of the device becomes complex, and manufacturing costs are high. become.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide an MRI apparatus equipped with a simple and highly reliable wiring structure for leading the signal line of a receiving probe to the outside of the apparatus. Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, the MRI training of the present invention includes a bed, a top plate which is movably provided on the bed and on which the patient is placed, and a bed for the patient to be examined. a gantry that applies a magnetic field to a subject; and a reception probe that is placed on the top plate and receives information from the subject who has received the magnetic field from the gantry; A connector that connects the signal line pulled out from the probe, a lead-out signal line connected to this connector and pulled out to the outside of the top plate, and a part of this lead-out signal line located outside the top plate in the direction of movement of the top plate. The present invention is characterized in that a signal wire holding member for pulling out a signal is provided, which is held along the top plate and is movable along the moving direction as the top plate moves.

(Function) Since the top plate is equipped with a connector that connects the signal line pulled out from the reception probe and the signal line for extraction, the signal line and connector move together as the top plate moves, and the top plate The signal line drawn out from the receiving probe does not get caught on the top plate or gantry when moving. The signal line drawn out from the receiving probe is connected to the connector provided on the top plate over a short distance, so there is very little risk of the signal line coming into contact with the subject. Unlike conventional moving bodies, there is no need to provide a large-scale member to lead the signal line of the receiving probe to the outside of the device, and only a signal line holding member with a simple structure is provided, resulting in a simple configuration.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

FIG. 8 shows the entire MRI apparatus, with reference numeral 1 indicating a horizontally arranged bed, 2 a top plate which is movable horizontally on the bed 1 and on which the subject H is placed, and 3 adjacent to the bed 1. 4 is a receiving probe disposed on the top plate 2; 5 is a lifting device, for example, a pantograph type, for raising and lowering the bed 1;

The configurations of the bed 1 and the top plate 2 will be explained with reference to FIGS. 1 to 7.

The bed 1 has guide rails 6 formed in the longitudinal direction on both sides thereof. As shown in FIG. 1, a pair of pulleys 7 are disposed on the bed 1 on the outside of one of the guide rails 6 with an interval in the longitudinal direction, and the pulleys 7 are arranged parallel to the guide rail 6. Belt 8 is wrapped around it. One pulley 7 is rotated by a motor (not shown) provided on the bed 1, and the belt 8 is rotated accordingly.

A top plate support 9 is fixed to the lower part of the end of the top plate 2 where the feet of the subject H placed on the top plate are located, and a pair of guides of the bed 1 are attached to both sides of the top plate support 9. A roller 10 that rotatably engages with the rail 6 is attached. Also,
A plurality of rollers 11 are attached to the center of the lower surface of the top plate 2 in a longitudinal direction, and these rollers 11 are rotatably engaged with guide rails (not shown) provided on the bed 1.

Thereby, the top plate 2 is provided on the bed 1 so as to be movable in the horizontal direction. In addition, the connecting body 1 attached to one side of the top plate support 9
2 is connected to a belt 8. As a result, the top plate 2 is driven toward and away from the gantry 3.

The configuration of the wiring for leading the signal line of the receiving probe 4 to the outside of the MRI apparatus will be explained with reference to FIGS. 1 to 7.

A connector 13 is attached to the upper surface of the end of the top plate 2 where the head of the subject H is located, along with the receiving probe 4. A signal line 14 for outputting a signal is drawn out from the receiving probe 4, and the signal line 14 of the receiving probe 4 is connected to the connector 13. A terminal box 15 is attached to the upper surface of the end of the top plate 2 where the feet of the subject H are located, and inside the terminal box 15 there are terminals 15a115.
b is accommodated. A lead-out signal line 16 is wired on the lower surface of the top plate 2 from the end where the head of the subject H is located to the end where the feet are located.
One end is pulled out to the top surface side of the top plate 2 through a hole 17 formed in the top plate 2, and a connector 1 is provided on the top surface of one end of the top plate 2.
3, and the other end is connected to the hole 1 formed in the top plate 2.
8 to the upper surface of the top plate 2, and is connected to one terminal 15a housed inside a terminal box 15 provided on the upper surface of the other end of the top plate 2.

A lead-out signal line 19 is connected to the other terminal 15b housed inside the terminal box 15, and this lead-out signal line 19 is drawn out and wired from the top plate 2 to the bed 1 according to a configuration described later. ing.

The lead-out signal line 19 is led from the top side of the top plate 2 to the bottom side through a hole 20 formed at the other end of the top plate 2.
The signal line guide 22 is guided along a connecting body 21 attached to the other side of the top plate support 9 provided at the top plate support 9 . The signal line guide 22 is shaped like a hammer and is formed on the outside of the other guide rail 6 in parallel with the other guide rail 6 on the bed 1 . The connecting body 21 extends from the top plate support 9 to the signal line guide 22 across the guide rail 6 of the bed 1. -Signal line guide 2
An elongated leaf spring 23 is disposed at 2 as a signal line holding means. That is, the plate spring 23 is arranged along the longitudinal direction of the signal line guide 22 with the middle part of the longitudinal direction bent for bending, and one end is fixed to the connecting body 21 while the other end is bent. It is fixed to the connecting body 21 on the side wall of the signal line guide 22 at a location near the gantry 3 . The leaf spring 23 is kept in contact with the side wall of the signal line guide 22 so as to extend along the longitudinal direction. Leaf spring 2 like this
The arrangement configuration No. 3 is for the purpose of elastically deforming the leaf spring 23 along the movement direction with the movement of the top plate 2 without strain. As shown in FIG. 1, FIG. 6, and FIG. It is wired in the longitudinal direction from one end of the signal line guide 22 to the other end of the leaf spring 23 fixed to the signal line guide 22, and is further drawn out downward through a hole 24 formed in the bottom wall of the signal line guide 22. The portion of the lead-out signal wire 19 wired along the leaf spring 23 is inserted into a synthetic resin tube 25 and bundled. As a result, the output signal line 19 drawn out from the top plate 2 is always held by the leaf spring 23 in a state where it is wired along a direction parallel to the top plate 2.

The lead-out signal line 19 is further led out to the outside of the MRI apparatus along the components of the lifting device 5, as shown in FIG. 8, for example, and connected to a signal processing circuit provided separately from the MRI apparatus. . The signal processing circuit includes, for example, an amplifier 26,
It is composed of a transmitting/receiving circuit 27 and a CPU 28.

The operation of the MRI apparatus configured in this way will be explained.

When not performing diagnosis, the top plate 2 is stopped at a position away from the gantry 3. FIG. 1 shows the position of the top plate 2 when no diagnosis is performed. In this case, the top plate 2 is the bed 1
in the corresponding position.

When making a diagnosis, the subject H is placed lying on the top plate 2 as shown in FIGS. 3 and 8.

For example, when diagnosing the head of the subject H, the reception probe 4 is placed over the head. The belt 8 is rotated by driving the top plate driving motor to rotate one pulley 7 around which the belt 8 is wound. The top plate 2 is moved toward the gantry 3 via the connecting body 12 by the rotation of the belt 8 . Top plate 2
The roller [0] provided on the top plate support 9 rotates on the guide rail 6 of the bed 1, and the roller [1] moves by rotating on the rail of the bed 1.

As the top plate 2 moves toward the gantry 3, the top plate 2
The connecting body 21 attached to the bed 1 moves together, and one end of the leaf spring 23 arranged on the signal line guide 22 of the bed 1 or the connecting body 2
1 and forcibly moves towards gantry 3. The leaf spring 23 is arranged in a folded state along the longitudinal direction of the signal line guide 22, and has one end fixed to the connecting body 21 and the other end fixed to the side wall of the signal line guide 22. For this reason,
When one end of the leaf spring 23 moves together with the connecting body 21, the folded portion also moves toward the gantry 3, and the portion that was in contact with the side wall of the signal line guide 22 moves away from the side wall.

In this way, the leaf spring 23 is attached to the gantry 3 along with the top plate 2.
move towards. Therefore, the leaf spring 23 moves while remaining disposed in the signal line guide 22 in the longitudinal direction, that is, along the moving direction of the top plate 2, while being elastically deformed as the top plate 2 moves. Therefore, the lead-out signal wire 19, which is wired and held along the longitudinal direction of the leaf spring 23, that is, along the moving direction of the top plate 2, moves along the moving direction as the top plate 2 moves.

When the receiving probe 4 placed on the top plate 2 reaches the inside of the gantry 3, the movement of the top plate 2 is stopped.

Then, a magnetic field is applied to the subject H on the top plate 2 by the gantry 3. The receiving probe 4 receives information from the subject H who has received this magnetic field, and outputs a signal according to the information. A signal from the receiving probe 4 passes through a signal line 14 connected thereto, and then passes through a lead-out signal line 16 wired to the lower surface of the top plate 2 via a connector 13. Further, the signal is transmitted to the signal processing circuit via the terminals 15a and 15b provided in the terminal box 15 and the lead-out signal line 19.

After the diagnosis, the top plate 2 is moved away from the gantry 3 and stopped at the original position. The operation in this case is the opposite of the above case.

In the MRI apparatus of this embodiment, a connector 13 is provided on the top surface of the top plate 2, and the signal line 14 of the receiving probe 4 is connected to this connector 13, so that when the top plate 2 moves,
Receiving probe 4, signal line 14, connector 13 or top plate 2
and move together. Therefore, when the top plate 2 moves, the signal line 14 connected to the receiving probe 4 is connected to the bed 1.
, will not get caught on the top plate 2 or gantry 3. In addition, the receiving probe 4, signal line 14, and connector 13 are placed together on the top plate 2, and the patient H on the top plate 2 connects the signal line 14 to the connector 13 at the shortest distance. The risk of contact with the signal line 14 is very small, and it is possible to prevent an accident in which the energy of the signal current flowing through the signal line 14 is reduced due to the subject H touching the signal line 14.

Furthermore, when the top plate 2 moves, the signal line 19 for drawing out from the top plate 2 is held by the leaf spring 23 and moves naturally and effortlessly along the moving direction of the top plate 2. Accidents such as damage to the lead-out signal line 19 and difficulty in moving the top plate 2 can be prevented from occurring.

Note that the present invention is not limited to the embodiments described above, and can be implemented with various modifications.

For example, the member that holds the lead-out signal line 14 drawn out from the top plate 2 is not limited to a leaf spring. Further, the terminals 15a and 15b may not be provided on the top plate 2, and the signal line 16 for drawing out the bow and the signal line 19 for drawing out may be configured as an integrated signal line.

[Effects of the Invention] As explained above, according to the MRI apparatus of the present invention, the top plate has a connector for connecting the signal line drawn out from the receiving probe, and a signal line connected to the connector and drawn out to the outside of the top plate. and a pull-out signal line that holds the portion of the pull-out signal line located outside the top plate along the moving direction of the top plate and is movable along the moving direction as the top plate moves. Since a holding member is provided, the signal wire pulled out from the receiving probe will not get caught on the top board or gantry when the top board is moved, and there is very little risk of the signal wire coming into contact with the patient. Unlike conventional moving bodies, there is no need to provide a large-scale member to lead the signal line of the probe to the outside of the device, and the structure is simple.

In addition, when the tabletop moves, the signal wire for pulling out from the tabletop to the outside moves naturally and effortlessly along the direction of movement of the tabletop, so that the signal wire for pulling is connected to the tabletop or bed. There is no tangle, and it is possible to prevent accidents such as damage to the lead-out signal wire and difficulty in moving the top plate.

[Brief explanation of the drawing]

The drawings show an embodiment of the MRI apparatus of the present invention, FIGS. 1 and 2 are plan views of the top plate and the bed, FIG. 3 is a plan view of the top plate, and FIG. 4 is a plan view of the top plate and the bed. A side view, FIG. 5 is a sectional view taken along line C-C in FIG. 1, and FIG. 6 is a cross-sectional view taken along line C-C in FIG. 1.
FIG. 7 is an enlarged sectional view taken along the line C--C in FIG. 1, and FIG. 8 is a diagram showing a state in which diagnosis is performed. 1... Bed, 2... Top plate, 3... Gantry, 4...
- Receiving probe, 13... Connector, 14... Signal line, 16.19... Output signal line, 23... Leaf spring. Figure 5 Figure 6 Applicant's agent Patent attorney Takehiko Suzue Figure 7

Claims (1)

[Claims] A bed, a top plate which is movably provided on the bed and on which the subject is placed, a gantry which applies a magnetic field to the subject, and the subject who is placed on the top plate and receives the magnetic field from the gantry. a receiving probe for receiving information from a user, and the top plate includes a connector to which a signal line drawn out from the receiving probe is connected, and a drawer connected to the connector and drawn out to the outside of the top plate. and a pull-out signal line that holds a portion of the pull-out signal line located outside the top plate along the moving direction of the top plate and is movable along the moving direction as the top plate moves. MR characterized in that a holding member is provided.
I device.