JPH0451775Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a nuclear magnetic resonance imaging system (hereinafter referred to as an MRI system), and in particular, it reduces the body movement of the abdomen and chest of the subject and provides high-quality This invention relates to an MRI device suitable for obtaining images.

[Prior art]

The object fixing device in conventional MRI apparatuses was designed to prevent the object from falling off the bed (hereinafter referred to as the bed), and fixed parts other than the high-frequency receiving coil.

[The problem that the idea aims to solve]

However, in the above-mentioned conventional technology, no consideration was taken to prevent body movement of the subject within the high-frequency receiving coil, and there was a problem in that artifacts occurred in the image.

The cause of the artifact is as follows.

MRI machines generally take measurements multiple times intermittently.
Breathing cannot be stopped during the entire measurement since the entire measurement takes several minutes. Therefore,
Body movements due to breathing are inevitable, and the same shape is measured at different positions in the measurement data, resulting in artifacts and blurring on the image.

The present invention has been made to solve the above problems.

An object of the present invention is to provide a technique that can prevent body movement of a subject within a high-frequency receiving coil and obtain good images without artifacts or blur.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a static magnetic field generating magnet that generates a static magnetic field in the vertical and horizontal directions orthogonal to the body axis of the subject lying on the top of the bed, and In an MRI apparatus having a high-frequency receiving coil that is placed close to a subject and irradiates the subject with electromagnetic waves or detects electromagnetic waves emitted from the subject, a coil provided in the longitudinal direction of the side end of the top plate a fixed band mounting member;
The most important feature is that it includes a high-frequency receiving coil installed on the top plate side and a cross-shaped fixing band installed to avoid the high-frequency receiving coil.

[Effect]

According to the above-mentioned method, the subject is fixed to the top of the bed from above the subject's abdomen or chest with a fixing band that crosses at the center of the subject to avoid the high-frequency receiving coil, for example. Since the body movement of the subject can be suppressed, artifacts caused by the body movement of the subject can be removed.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In addition, in all the figures for explaining the examples,
Components having the same function are given the same reference numerals, and repeated explanations thereof will be omitted.

This invention is described in Japanese Patent Application No. 62-324068.
This relates to an MRI device. Since the main body of the MRI apparatus of this embodiment is the same as that of the above-mentioned Japanese Patent Application No. 62-324068, its explanation will be omitted here.

FIG. 1 is a plan view for explaining the schematic configuration of the main parts of an embodiment of the MRI apparatus of the present invention, and FIG.
FIG. 3 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a sectional view taken along line B-B in FIG. 2, and FIG.
FIG. 3 is an explanatory diagram for explaining the schematic configuration of the coil shown in FIGS.

In the MRI apparatus of this embodiment, as shown in FIGS. 1 to 4, a mat 7 is spread on a top plate 2, and the subject 1 lies on it. The high-frequency receiving coil 3 is placed on the top plate 2 so that the lower high-frequency receiving coil 3, which is divided into two parts, is placed below the imaging site of the subject 1 in advance. A magic tape (fixing band attachment member) 6a for fixing the fixing band 6 and the like is provided on the back surface of the side end of the top plate 2.
When pressing the abdomen of the subject 1, the fixing mat 5 is placed on the abdomen and the fixing band 6 is fixed to the Velcro tape 6a on the back of the top board with the Velcro tape 6b sewn to the fixing band 6. After fixing the subject 1, the upper high-frequency receiving coil 4 shown in FIG. It is attached to the lower high frequency receiving coil 3 using the connector 3a. The fixed band 6 has a cross shape and is designed to avoid the upper high frequency receiving coil 4. When the thickness of the subject fixing part changes, the fixing band 6 is adjusted to reach the magic tape 6a on the back side of the top plate 2 by changing the thickness of the fixing mat 5. When photographing the chest,
The arrangement of the mat 7 and the lower high-frequency receiving coil 3 may be rearranged so that the lower high-frequency receiving coil 3 is placed under the chest.

In this embodiment, the high-frequency receiving coils 3 and 4 are divided into upper and lower halves, but the fixed band of the present invention can also be used with an integrated type.

The members used near the high-frequency receiving coils 3 and 4 are made of non-magnetic material in order to prevent the static magnetic field from being emitted.

The fixing mats 5 and 7 are made of, for example, polyurethane sponge. The fixing band is made of, for example, nylon cloth, and the top plate 2 is made of, for example, FRP resin.

The high-frequency receiving coils 3 and 4 are described in detail in the aforementioned Japanese Patent Application No. 62-324068, so their explanation will be omitted here.

As can be seen from the above description, according to the present embodiment, a fixed band is inserted from above the abdomen or chest of the subject 1 and crosses at the center of the subject 1 so as to avoid the high frequency receiving coils 3 and 4, for example. By fixing the subject 1 to the top plate 2 at step 6, the body movement of the subject 1 can be suppressed. Artifacts caused by body movements in the longitudinal direction of the plate 2 can be removed.

Although the present invention has been specifically explained above based on examples, it goes without saying that the present invention is not limited to the above-mentioned examples, and can be modified in various ways without departing from the gist thereof. .

[Effect of idea]

As explained above, according to the present invention, it is possible to avoid the high-frequency receiving coil and suppress the movement of the imaging area of the subject, so it is possible to remove artifacts caused by body movements of the subject on the image. .

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining the schematic configuration of the main parts of an embodiment of the MRI apparatus of the present invention, and FIG.
FIG. 3 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a sectional view taken along line B-B in FIG. 2, and FIG.
FIG. 3 is an explanatory diagram for explaining the schematic configuration of the coil shown in FIGS. In the figure, 1... Subject, 2... Top plate, 3... Lower high frequency receiving coil, 3a... Connector, 4...
Upper high frequency receiving coil, 4a...Connector, 5
...Fixing mat, 6...Fixing band, 6a...Magic tape, 6b...Magic tape, 7...
Matsuto.

Claims (1)

[Scope of utility model registration request] It has a static magnetic field generating magnet that generates a static magnetic field in the vertical and horizontal directions perpendicular to the body axis of a subject lying on the top of the bed, and is placed close to the subject to generate electromagnetic waves to the subject. In a nuclear magnetic resonance imaging apparatus having a high frequency receiving coil for irradiating electromagnetic waves or detecting electromagnetic waves emitted from a subject, a fixing band mounting member provided in the longitudinal direction of the side end of the top plate, and a top plate side 1. A nuclear magnetic resonance imaging apparatus comprising: a high-frequency receiving coil provided at the top; and a cross-shaped fixed band provided to avoid the high-frequency receiving coil.