JPH1133010A - Magnetic resonance imaging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand an operation space for an IVR and the like in compliance with a shape of a device chamber by arranging a shift adjusting means by which position setting can be carried out so that the longitudinal direction of a bed and the predetermined positional direction crossing the generated magnetic flux of a static magnetic field generating device perpendicularly in the device keep substantially parallel or orthogonal positional relationship between them. SOLUTION: A top plate of a bed 52 is supported movably in the arrow Y direction along a side frame 53, while a leg 56 provided with a caster 57 is arranged under a base frame. Below the bed 52, a rail 65 is facingly fixed to the leg 56 orthogonaly to the longitudinal direction of the bed 52. A slide guide 62 is arranged in a mounting metal fitting 61 for a static magnetic field generating device 51, and a mounting plate 60 for the bed 52 is fixed to the slide guide 62 by means of a screw 63, so that the bed 52 can be arranged longitudinally in the predetermined position in which the bed 52 crosses the generated magnetic flux in the static magnetic field generating device 51 perpendicularly substantially, while the top plate can be moved in the arrow X direction by means of the slide guide 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic resonance imaging apparatus (sometimes abbreviated as MRI), and more particularly to an IVR, that is, an apparatus suitable for performing a therapeutic technique using a catheter or the like in image diagnosis. Related to the structure of the bed.

[0002]

2. Description of the Related Art In a conventional magnetic resonance imaging apparatus, a bed and a static magnetic field generator are integrally formed, and a fixed frame installed on a floor in a room and an upper frame moving opposite thereto are provided. It is composed of The upper frame supports a subject load by a hydraulic cylinder and forms a required movement trajectory using a pantograph. Further, the upper frame has a structure that allows a subject, for example, a top plate on which a human body lies to be movable in the body axis direction of the subject. Therefore, in order to move the subject to an area where imaging is possible, only the top plate is moved in the body axis direction. In addition, gantry (magnet body)
There is also a configuration example in which a support rail is provided from above and the upper part of the bed is slid thereon.

[0003]

The former of the prior art has the following problems. For example, when a couch on which a subject is placed on a couchtop is transferred into the diagnostic apparatus for imaging, only the couchtop is retracted from the diagnosis apparatus by the transfer amount, but the couch body remains without moving. However, the amount of protrusion from the diagnostic device does not change. In the latter prior art in which a support rail is provided on a gantry, the support rail protrudes from the gantry. Therefore, the limited operation space in the imaging room is not wide even when the bed is housed in the diagnostic apparatus, and the implementation of the therapeutic technique by the IVR is narrow, which impairs the operability. In terms of installation space,
A large installation space is required depending on the sum of the depth of the gantry and the longitudinal dimension of the bed and the width of the gantry. Furthermore, depending on the installation room, shapes such as a vertical rectangle and a square are various, and it is difficult to obtain an optimal relationship between a gantry and a bed corresponding to various shapes of the installation room. SUMMARY OF THE INVENTION An object of the present invention is to provide a bed for a magnetic resonance imaging apparatus suitable for various shapes of an apparatus room and suitable for expanding an operation space such as an IVR.

[0004]

According to the present invention, there is provided a magnetic resonance imaging apparatus having a bed and a static magnetic field generator, wherein the longitudinal direction of the bed is perpendicular to the generated magnetic flux of the static magnetic field generator. And a movement adjusting means for setting a position so that a predetermined position direction in the device to be maintained is substantially parallel to each other, and a movement adjusting means for setting a position so as to maintain a substantially perpendicular relationship to each other. . That is, the static magnetic field generator, the bed can be moved so that the longitudinal direction of the bed is substantially parallel, or a substantially right angle, toward a predetermined position direction in the device orthogonal to the generated magnetic flux,
A member is provided so that the top plate on which the subject is placed can be moved to a position where the subject can be photographed, and wheels for supporting the weight of the bed are provided. It is configured to be movable and fixed in the direction. Thereby, selectively from a direction orthogonal to the magnetic flux generated by the gantry of the magnetic resonance imaging apparatus,
The bed can be set so that it can be accessed.

[0005]

FIG. 1 is a block diagram showing the overall configuration of a magnetic resonance imaging apparatus according to the present invention. This magnetic resonance imaging apparatus obtains a tomographic image of a subject 1 using a magnetic resonance (NMR) phenomenon, and includes a static magnetic field generation system 2 having a necessary and sufficiently large bore diameter, a sequencer 7, a central processing unit, and the like. (Abbreviated as CPU) 8, a gradient magnetic field generation system 3, a transmission system 4, a reception system 5, a signal processing system 6, and the like. The static magnetic field generation system 2 generates a uniform magnetic flux around the subject 1 in the body axis direction or in a direction perpendicular to the body axis.
A magnetic field generating means based on a permanent magnet system, a charging conduction system, or a superconducting system is arranged.

The sequencer 7 operates under the control of the CPU 8 and sends various commands necessary for data collection of tomographic images of the subject 1 to the transmission system 4, the gradient magnetic field generation system 3, and the reception system 5.

The transmission system 4 includes a high-frequency oscillator 11, a modulator 1
2. A high-frequency amplifier 13 and a transmission-side high-frequency coil 14a. The high-frequency pulse output from the high-frequency transmitter 11 is amplitude-modulated by the modulator 12 according to a command of the sequencer 7, and the high-frequency pulse subjected to the amplitude modulation is converted to
After the amplification, the subject 1 is supplied to a high-frequency coil 14a (transmitting side) arranged close to the subject 1, so that the subject 1 is irradiated with an electromagnetic wave.

The gradient magnetic field generating system 3 includes gradient magnetic field coils 9 and 9 wound in three directions of X, Y and Z, and a gradient magnetic field power supply 10 for driving the respective coils. The gradient magnetic field power supplies 10 for the coils in the X, Y, and Z directions are driven, and the gradient magnetic fields Gx, G in the X, Y, and Z directions are driven.
y and Gz are applied to the subject 1. By applying the gradient magnetic field, a slice plane for the subject 1 can be set.

The receiving system 5 comprises a high-frequency coil 14b (receiving side), an amplifier 15, a quadrature detector 16, and an A / D converter 17, and the subject 1 is exposed to electromagnetic waves emitted from the high-frequency coil 14a on the transmitting side. A response electromagnetic wave (NMR) signal is detected by a high-frequency coil 14b on the receiving side, which is arranged close to the subject 1, and the amplifier 15 and the quadrature phase detector 16
To the A / D converter 17 to convert into a digital quantity. At this time, the A / D converter 17 samples the two series of signals output from the quadrature phase detector 16 at a timing according to a command from the sequencer 7 and outputs two series of digital data. These digital signals are sent to the signal processing system 6 and subjected to Fourier transform.

The signal processing system 6 includes a CPU 8, a recording device such as a magnetic disk 18 and a magnetic tape 19, and a display 20 such as a CRT. The digital signal is used to perform a Fourier transform, a correction coefficient calculation, and an image reconstruction. And the like, and a signal intensity distribution of an arbitrary cross section or a distribution obtained by performing an appropriate operation on a plurality of signals is imaged and displayed on the display 20.

An embodiment of the present invention will be described in detail with reference to FIGS. 2, 3 and 4. FIG. FIG. 2 shows a bed 52 in a static magnetic field generator 51 with respect to a predetermined position direction orthogonal to the generated magnetic flux.
FIG. 3 is a perspective view of the static magnetic field generator 5 arranged in the vertical direction.
1 is a perspective view in which a bed 52 is arranged in a lateral direction with respect to a predetermined position direction orthogonal to a generated magnetic flux in FIG. The bed 52 shown in FIGS. 2 and 3 is the same. FIG. 4 is a perspective view showing a guide mechanism when the bed 52 shown in FIG. 3 is arranged in a lateral direction.

In FIG. 2, a couch 52 moves a table 54 on which a subject 1 (not shown in FIG. 1) rests in the direction of arrow Y along two side frames 53 on both sides. Supported as possible. Two side frames 5
Reference numerals 3 and 53 are welded and fixed to the base frame 55, and are configured to maintain an interval therebetween. Further, legs 56 each having four casters 57 are provided below the base frame 55. Further, a pair of rails 65, 65 are fixed to the legs 56 below the bed 52 in a direction perpendicular to the longitudinal direction of the bed 52.

The mounting bracket 61 fixed to the static magnetic field generator 51 is provided with a slide guide 62. The mounting plate 60 of the bed 52 is fixed to the slide guide 62 by using screws 63, whereby the static magnetic field generator 51 is mounted. Inside,
The bed 52 can be arranged in a vertical direction at a predetermined position substantially orthogonal to the generated magnetic flux, and the top 54 is configured to be movable in the arrow X direction by a slide guide.

However, the mounting bracket 61 and the static magnetic field generator 5
The position relative to 1 is not limited to the position shown in FIG. 2 as long as the direction is perpendicular to the magnetic flux generated by the gantry.

When a handle 59 provided on the rear portion of the top plate 54 is rotated, a pinion (not shown) engaged with the handle 59 engages with a rack (not shown) fixed to the side frame 53, so that the top plate 54 Can be locked to prevent movement. Further, since the bed 52 is provided with the casters 57, the casters 57 can be locked by depressing the pedal 58.

Next, referring to FIGS. 3 and 4, a description will be given of the movement guide mechanism when the bed 52 is arranged horizontally. As shown in FIG. 4, a guide 64 is provided in the static magnetic field generator 51,
Rails 65, 65 attached to the bed 52 are used as guides 64,
64 so as to be slidable. As a result, the bed 52 arranged horizontally as shown in FIG. 3 moves in the direction of arrow Y along the guide 64, and the static magnetic field generator 5
The bed 52 is configured so as to be able to be drawn into the interior so as to be arranged in the lateral direction with respect to a predetermined position direction orthogonal to the generated magnetic flux in 1.

As described above, by using the bed 52 according to the present invention, it is easy to obtain an optimal gantry and bed layout corresponding to the size of the room in which the magnetic resonance imaging apparatus is installed and the arrangement of various devices. Therefore, it is possible to provide a magnetic resonance imaging apparatus suitable for expanding an operation space such as an IVR.

[0018]

According to the present invention, the bed is freely selected and set so as to be vertically or horizontally arranged in a direction of a predetermined position orthogonal to the magnetic flux generated in the magnetic resonance imaging apparatus. When the subject is transferred into the diagnostic apparatus, the bed itself can be transferred together, so that the limited operation space in the diagnostic apparatus room is expanded and the installation efficiency of the indoor apparatus is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a magnetic resonance imaging apparatus according to the present invention.

FIG. 2 is a perspective view in which a bed is arranged in a vertical direction with respect to a predetermined position direction orthogonal to a magnetic flux generated in a static magnetic field generation device according to the present invention.

FIG. 3 is a perspective view in which a bed is arranged in a horizontal direction with respect to a predetermined position direction orthogonal to a magnetic flux generated in a static magnetic field generation device according to the present invention.

FIG. 4 is a perspective view showing a bed movement guide mechanism in FIG. 3;

[Explanation of symbols]

1. Subject 2: Static magnetic field generation system 3.
Gradient magnetic field generation system 4 ... Transmission system 5 ... Reception system 6 ...
Signal processing system 7 ... Sequencer 8 ... CPU 9 ...
Gradient magnetic field coil 10 ... Gradient magnetic field power supply 11 ... High frequency oscillator 12
... Modulator 13 ... Amplifier 14a ... High-frequency transmission coil 14b
... High frequency receiving coil 15 ... Amplifier 16 ... Quadrature transfer detector 17
... A / D converter 18 ... Magnetic disk 19 ... Magnetic tape 20
... display 51 ... static magnetic field generator 52 ... bed 53 ... side frame 54 ... top plate 55 ... base frame 56 ... leg 57 ... caster 58 ... pedal 59 ... handle 60 ... plate 61 ... mounting bracket 62 ... slide guide 63 ... screw 64 … Guide 65… Rail

Claims (5)

[Claims] 1. A static magnetic field generation system including a gradient magnetic field generation system, a transmission system including a high-frequency transmission coil for irradiating an object with electromagnetic waves,
A receiving system including a high-frequency receiving coil for detecting a magnetic resonance signal from the subject, a signal processing system for obtaining a physical characteristic image of the subject based on the detection signal, and an apparatus main body including a built-in electrostatic magnetic field generating unit; A bed for transferring the subject to a predetermined position in the apparatus body orthogonal to the magnetic flux generated by the static magnetic field generating means, wherein the bed is moved in the longitudinal direction of the bed and the predetermined position. First movement adjusting means for setting the position so that the directions thereof maintain a substantially parallel relationship with each other; and the bed so that a longitudinal direction of the bed and the predetermined position direction maintain a substantially perpendicular relationship to each other. A magnetic resonance imaging apparatus comprising: a second movement adjusting means for setting a position. 2. The apparatus according to claim 1, wherein the first movement adjusting means and the second movement adjusting means move and fix the subject toward the predetermined position in the apparatus main body to a position where the subject can be photographed. 2. The magnetic resonance imaging apparatus according to claim 1, wherein the magnetic resonance imaging apparatus has a function of performing 3. The first movement adjusting means includes: a top board on which the subject is placed on the bed and which moves to a position where the subject can be imaged; and a top board that moves along the bed. 3. A guide unit for causing the bed to be fixed to an apparatus main body having the static magnetic field generating unit therein, and a wheel supporting the bed. Magnetic resonance imaging equipment. 4. The connecting device according to claim 3, wherein said connecting means for fixing said bed to said apparatus main body includes engaging guide means movable in a direction substantially perpendicular to the longitudinal direction of said bed. Magnetic resonance imaging device. 5. The second movement adjusting means is provided between the apparatus main body and the couch, and includes a guide and a rail for guiding the entire couch so as to be movable, and wheels for supporting the couch. The magnetic resonance imaging apparatus according to claim 1, wherein: