JPH06261883A - Magnetic resonance imaging device - Google Patents

Abstract

PURPOSE:To constitute a magnetic resonance imaging device so that a head rest part can be received in a top board at the time of a state that it is not used by connecting this head rest part integrally with the top board of a bed. CONSTITUTION:In the magnetic resonance imaging device provided with a bed having a top board 2 for placing an examinee thereon, this device is provided with a head rest part connected integrally with the top board 2, and also, connected so that it can be received in this top board 2. Also, this head rest part consists of a head rest 1, a link 3 in which one end is engaged to this head rest 1 and the other end is attached to the top board 2 of the bed so that it can be attached pivotally and integrally, and a supporting member 4 supported axially to this link 3 so as to be turnable, and a first groove part 5 for receiving the head rest part in the top board 2 of the bed, and a second groove part 6 for stopping the supporting member 4 at the time when the head rest part is set to a use state are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved apparatus for a headrest portion which is used in a magnetic resonance imaging apparatus and is used for photographing the head of an examinee and which is provided on a top plate of a bed.

[0002]

2. Description of the Related Art The nuclear magnetic resonance phenomenon is a phenomenon in which an atomic nucleus having a non-zero spin and magnetic moment placed in a static magnetic field resonates and emits only a specific electromagnetic wave.
This nucleus has an angular frequency ω ₀ (ω ₀ = 2πν
Resonates at ₀ , ν ₀ ; Larmor frequency).

Ω ₀ = γ · H ₀ where γ is the gyromagnetic ratio peculiar to the type of nucleus,
H ₀ is the static magnetic field strength.

An apparatus for performing a biomedical diagnosis using the above principle receives an electromagnetic wave of the same frequency as that induced after the above-mentioned resonance absorption by a receiving coil and performs signal processing to obtain a nuclear density and a longitudinal relaxation time T. ₁ , non-invasively obtaining diagnostic information in which information such as ₁ , lateral relaxation time T ₂ , flow, and chemical shift is reflected, for example, a slice image of a subject.

The collection of diagnostic information by nuclear magnetic resonance is capable of exciting all the parts of the subject placed in a static magnetic field and collecting signals. Due to the clinical requirement of the image, an actual device is designed to excite a specific site and collect its signal.

In this case, the specific region to be imaged is generally a slice region having a certain thickness, and an echo signal or FI from this slice region is generally used.
The nuclear magnetic resonance signal (NMR signal) of the D signal is collected by executing the data encoding process many times, and these data groups are subjected to image reconstruction processing by, for example, a two-dimensional Fourier transform method to obtain the specific slice region. I am trying to generate an image.

A head coil is used as a receiving coil in head imaging by such a magnetic resonance imaging apparatus. At this time, a headrest is used for mounting the head when the subject lies on the bed, and the head coil is arranged so as to surround the subject's head and the headrest. Conventionally,
As this headrest, for example, one shown in FIG. 4 has been used. This is used in a state where one end of the headrest 1 is screwed into a groove 2a provided in the top plate 2 of the bed.

[0008]

However, in this type of conventional headrest, the headrest must be removed when photographing the lower limbs, such as the knee, and the headrest must be screwed between when it is used and when it is not used. Since it had to be attached and detached, the work was troublesome and inconvenient. In addition, since it is screwed into a groove provided on the top plate of the bed, there is a disadvantage that a gap is formed between the groove and the headrest mounting portion, and the headrest is shaken left and right.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a headrest portion integrally with a top plate of a bed so that the headrest portion can be stored in the top plate when not in use. Another object of the present invention is to provide a magnetic resonance imaging apparatus.

[0010]

In order to achieve the above object, the present invention makes it possible for an operator to easily set a headrest to a use state or a non-use state by configuring the magnetic resonance imaging apparatus as follows. I made it possible.
That is, a means for irradiating the subject with electromagnetic waves in a static magnetic field, a receiving coil as means for detecting the response to the electromagnetic waves, and a bed for accurately positioning the subject's imaging position within the imaging region. In a magnetic resonance imaging apparatus having, a headrest portion is integrally provided on the top plate of the bed, and when the head coil is used as the receiving coil, the headrest portion is in use, and when not in use The feature is that the headrest part can be stored in the top plate.

Further, in this magnetic resonance imaging apparatus, the headrest portion includes a headrest, a link which is engaged with the headrest at one end thereof and the other end of which is integrally pivotally attached to the bed of the bed, and the link. A support member rotatably supported on the bed, and a first groove portion for accommodating the headrest portion on the bed of the bed and a second groove for stopping the support member when the headrest portion is in use. A groove is provided.

[0012]

According to the above construction, when photographing the head of the subject, the headrest portion can be lifted from the top plate by hand to be in use, and when not in use, the headrest portion is stored in the top plate. Since it is possible, there is no need to install and remove the headrest, which is convenient and hassle free.

Further, since the headrest portion is composed of the headrest, the link and the supporting member, and the top plate of the bed is provided with the first groove portion and the second groove portion, the headrest portion can be housed or used. , The storage state of the headrest has been simplified and the headrest does not shake left or right even when it is in use.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a magnetic resonance imaging apparatus to which the present invention is applied. This magnetic resonance imaging apparatus includes a computer system 10 as a control center of the entire system, and under the control of this computer system 10, a sequencer 11 causes a gradient magnetic field power supply 12 and a transmitter 13 to perform a sequence operation. At this time, an RF pulse is applied to the subject P placed on the bed 2 of the bed in the static magnetic field space of the main magnet 14 by the transmission coil 15 driven by the transmitter 13, and at the same time. A gradient magnetic field is applied by the gradient magnetic field coil 16 driven by the gradient magnetic field power supply 12. As a result, the magnetic resonance signal excited in the subject 1 is received by the receiver 1 via the receiving coil 17.
8 received and detected, computer system 1
Sent to 0. The computer system 10 collects magnetic resonance signals, obtains morphological information such as a slice image of the subject 1 based on the collected magnetic resonance signals, and displays the morphological information on the monitor 19.

The present invention is mainly an improvement of the headrest portion arranged on the top plate 2 on the bed of the magnetic resonance imaging apparatus. FIG. 2 shows an embodiment of the headrest portion of the magnetic resonance imaging apparatus of the present invention, and is a view showing a usage state thereof. 2 (a) is a perspective view, FIG. 2 (b) is a cross-sectional view of the top plate of the bed, and FIG. 2 (c) is a perspective view of the engaging portion. In FIG. 2, the headrest 1 is engaged with one end of the link 3 and supported by the protrusion 3 a of the link 3. The other end of the link 3 is integrally attached to the bed 2 of the bed so as to be pivotally mounted around the shaft 7. Further, the link 3 is provided with a support member 4 rotatably supported by a shaft 8. As shown in FIG. 2C, the protrusion 3a of the link 3 is formed with a convex portion, and the convex portion engages with the concave portion on the side of the headrest 1 with a pin 9 or the like to rotate the headrest 1. It supports movably. The headrest 1, the link 3, and the support member 4 form a headrest portion. On the other hand, the couchtop 2 of the bed is provided with a first groove portion 5 for accommodating the headrest portion and a second groove portion 6 for stopping the support member 4 when the headrest portion is in a use state. . When the headrest portion is to be used, the headrest 1 of the stored headrest portion is lifted from the first groove portion 5 by hand, and the support member 4 is locked in the second groove portion 6, as shown in FIG. Set to a proper usage state.

In the bed provided with the headrest portion, a static magnetic field is formed in the gantry or the like, and means for irradiating the subject with electromagnetic waves in the static magnetic field is arranged. It is provided for accurate positioning within the imaging area. When the head is imaged, a cylindrical head coil is used as a receiving coil, and the headrest 1 set in the used state is arranged in the cylinder of the head coil. The head of the subject lying on the bed is placed on the headrest 1 and imaging is performed. Therefore, each member constituting the headrest portion must be a nonmagnetic and nonconductive material so as not to be affected by the magnetic field.

FIG. 3 is a diagram showing an embodiment of the headrest portion of the magnetic resonance imaging apparatus of the present invention, showing its stored state. 3A is a perspective view, and FIG. 3B is a cross-sectional view of the top plate of the bed. FIG. 3 shows a state in which the headrest portion in the used state shown in FIG. 2 is stored in the bed of the bed when not in use. The support member 4 of the headrest portion in use is unlocked from the engagement with the second groove portion 6 and rotated, and the headrest 1 and the link 3 are pushed to rotate them around the shaft 7 and push them into the first groove portion 5. As a result, the storage state as shown in FIG. 3B can be easily achieved. Since the link 3 is pivotally attached to the shaft 7 in the headrest portion,
Headrest 1 no longer shakes left and right when in use.

[0018]

As described above, according to the present invention, the headrest portion can be easily lifted from the top plate by hand to be used, and when not in use, the headrest portion can be stored in the top plate. Therefore, there is no need to attach or remove the headrest, which eliminates the hassle and is convenient. Further, since the headrest portion is attached by a link so as to be pivotally attached, there is an effect that the headrest is prevented from moving to the left and right.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a magnetic resonance imaging apparatus to which the present invention is applied.

FIG. 2 is a diagram showing an example of a headrest portion of the magnetic resonance imaging apparatus of the present invention, showing a usage state thereof.

FIG. 3 is a diagram showing an example of a headrest portion of a magnetic resonance imaging apparatus of the present invention, showing a housed state thereof.

FIG. 4 is a diagram for explaining a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Headrest 2 Bed top 3 Link 4 Support member 5 First groove part 6 Second groove part 7 Axis 8 Axis 9 pin 14 Main magnet 15 Transmitting coil 16 Gradient magnetic field coil 17 Receiving coil

Claims (2)

[Claims] 1. A static magnetic field generating means for generating a static magnetic field, a gradient magnetic field generating means for generating a gradient magnetic field superimposed on the static magnetic field, and at least one of generation of a high frequency pulse and reception of a magnetic resonance signal. In a magnetic resonance imaging apparatus including an RF coil to be performed and a bed having a table on which a subject is placed, a headrest portion provided integrally with the table and capable of being stored in the table. A magnetic resonance imaging apparatus comprising: 2. The headrest portion according to claim 1,
The bed includes a headrest, a link having one end engaged with the headrest and the other end integrally and pivotally attached to a top plate of the bed, and a support member pivotally supported by the link. 2. A magnetic resonance imaging apparatus comprising: a top plate provided with a first groove portion for accommodating a headrest portion and a second groove portion for stopping the support member when the headrest portion is in use.