JP2001258864A - Inclined magnetic field unit and magnetic resonance imaging device - Google Patents
Inclined magnetic field unit and magnetic resonance imaging deviceInfo
- Publication number
- JP2001258864A JP2001258864A JP2000076019A JP2000076019A JP2001258864A JP 2001258864 A JP2001258864 A JP 2001258864A JP 2000076019 A JP2000076019 A JP 2000076019A JP 2000076019 A JP2000076019 A JP 2000076019A JP 2001258864 A JP2001258864 A JP 2001258864A
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- Prior art keywords
- magnetic field
- vibration
- sealing
- vacuum
- gradient magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主に医療診断等に
用いられる磁気共鳴イメージング（ＭＲＩ）装置および
その遮音方法に係り、特に、傾斜磁場コイルの駆動に伴
って発生する騒音を大幅に抑制できるようにした静音型
の傾斜磁場ユニットおよび磁気共鳴イメージング装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic resonance imaging (MRI) apparatus mainly used for medical diagnosis and the like and a sound insulation method thereof, and in particular, greatly reduces noise generated when a gradient magnetic field coil is driven. The present invention relates to a silent type gradient magnetic field unit and a magnetic resonance imaging apparatus that can be used.
【０００２】[0002]
【従来の技術】医療診断用の磁気共鳴イメージング装置
は被検体内の原子核スピンの磁気共鳴現象に基づく画像
化装置であり、非侵襲で、しかも放射線被曝が無い状態
で被検体内部の画像を得ることができる。このため、臨
床の場でもその有用性が近年富に発揮されている。一般
に、ＭＲ画像を得るための磁気共鳴イメージング装置
は、撮影空間に被検体を挿入・配置するガントリと、こ
のガントリと共働させる装置本体とを備える。ガントリ
には各種の装備が施されるが、とりわけ、診断空間に静
磁場を発生させる超電導磁石などの磁石、静磁場に重畳
させる線形の傾斜磁場を発生させる傾斜磁場コイル、お
よび高周波信号を送信するとともにＭＲ信号を受信する
ＲＦコイルが必須になっている。撮像時には、所望のパ
ルスシーケンスにしたがってそれらの傾斜磁場コイル、
およびＲＦコイルが駆動される。つまり、パルスシーケ
ンスにしたがって、静磁場中に置かれた被検体にｘ，
ｙ，ｚ軸各方向の線形傾斜磁場が重畳され、被検体の原
子核スピンがラーモア周波数の高周波信号で磁気的に励
起される。この励起に伴って発生する磁気共鳴（ＭＲ）
信号が検出され、この信号に基づいて被検体の例えば２
次元断層像が再構成される。2. Description of the Related Art A magnetic resonance imaging apparatus for medical diagnosis is an imaging apparatus based on a magnetic resonance phenomenon of nuclear spins in a subject, and obtains an image of the inside of the subject in a non-invasive state without radiation exposure. be able to. For this reason, its usefulness has been demonstrated in clinical settings in recent years. In general, a magnetic resonance imaging apparatus for obtaining an MR image includes a gantry for inserting and arranging a subject in an imaging space, and a device main body cooperating with the gantry. The gantry is equipped with various types of equipment, such as a magnet such as a superconducting magnet that generates a static magnetic field in the diagnostic space, a gradient coil that generates a linear gradient magnetic field that is superimposed on the static magnetic field, and transmits a high-frequency signal. In addition, an RF coil for receiving the MR signal is indispensable. During imaging, those gradient coils according to the desired pulse sequence,
And the RF coil is driven. That is, according to the pulse sequence, x,
A linear gradient magnetic field in each of the y- and z-axis directions is superimposed, and the nuclear spin of the subject is magnetically excited by a high frequency signal of the Larmor frequency. Magnetic resonance (MR) generated with this excitation
A signal is detected, and for example, 2
A two-dimensional tomographic image is reconstructed.
【０００３】このような磁気共鳴イメージングにおい
て、近年、イメージングに要する時間を短縮したいとい
うイメージングの高速化のニーズが非常に高くなってい
る。これに応えるべく、高速ＥＰＩ法など、傾斜磁場パ
ルスの高速スイッチング（高速反転）を伴うパルスシー
ケンスが開発され、実用化にも成功しているものもあ
る。傾斜磁場パルスを発生させると、その立上がりや反
転時に傾斜磁場コイルに電磁気力が作用する。この電磁
気力はコイルユニットに機械的歪みを起こさせ、これに
よりユニット全体から振動が発生する。このコイルユニ
ットの振動により、空気振動が生じ、騒音が発生すると
いう問題がある。とくに、傾斜磁場パルスを高速反転さ
せると、その振動は増大するから、高速化が進むほど発
生する騒音も増大する。この騒音は、ガントリの撮影空
間に横になっている被検体（患者）に非常な不快感や不
安感を与えることがある。このため、かかる騒音を排除
すべく、従来、いくつかの提案がなされている。たとえ
ば特開昭６３−２４６１４６号、特開平６−１８９９３
２号、特開平１０−１１８０４３号（以後それぞれ第１
〜第３の従来例と称する）などに示されているように、
傾斜磁場コイルのユニット全体を真空容器内に密封し、
真空空間により振動または騒音の空気伝搬を絶つという
試みである。[0003] In such magnetic resonance imaging, in recent years, there has been a very high demand for high-speed imaging in order to reduce the time required for imaging. In response to this, pulse sequences involving high-speed switching (high-speed inversion) of gradient magnetic field pulses, such as the high-speed EPI method, have been developed, and some of them have been successfully commercialized. When a gradient magnetic field pulse is generated, an electromagnetic force acts on the gradient magnetic field coil when the pulse rises or reverses. This electromagnetic force causes mechanical distortion in the coil unit, which causes vibration to occur from the entire unit. Due to the vibration of the coil unit, there is a problem that air vibration is generated and noise is generated. In particular, when the gradient magnetic field pulse is reversed at a high speed, the vibration increases, so that as the speed increases, the noise generated also increases. This noise may give the subject (patient) lying in the imaging space of the gantry very discomfort or anxiety. For this reason, several proposals have conventionally been made to eliminate such noise. For example, JP-A-63-246146, JP-A-6-18993
No. 2 and Japanese Patent Application Laid-Open No.
To a third conventional example), etc.,
Seal the entire gradient coil unit in a vacuum vessel,
It is an attempt to cut off the air propagation of vibrations or noise by a vacuum space.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、第１お
よび第２の従来例における遮音方法では、空気を伝わっ
て聞こえる空気伝搬は真空状態により遮断することがで
きるが、固定のための接触による固定伝搬は遮断するこ
とができず、この固定伝搬により大きな音が発生し、騒
音対策としては不十分であった。また、第３の従来例の
ように、特に振動の大きい傾斜磁場コイルを単独に床で
支え固定伝搬を抑える方法もあるが、傾斜磁場コイルと
床までの距離が長いため、傾斜磁場コイルを床に支える
支柱の下部の位置が少しずれると、支柱上部に取り付け
られた傾斜磁場コイルの位置が大きくずれることとな
り、傾斜磁場コイルの位置調整が困難であり、据付調整
にも長時間を要し費用も嵩むという問題を有していた。However, in the sound insulation methods of the first and second conventional examples, the air propagation that can be heard through the air can be cut off by a vacuum, but the fixed propagation by the contact for fixing is not possible. Could not be cut off, and this fixed propagation produced a loud noise, which was insufficient as a noise countermeasure. As in the third conventional example, there is also a method in which a gradient magnetic field coil having particularly large vibration is supported on the floor alone to suppress fixed propagation. However, since the distance between the gradient magnetic field coil and the floor is long, the gradient magnetic field coil is mounted on the floor. If the position of the lower part of the supporting column is slightly shifted, the position of the gradient magnetic field coil attached to the upper part of the supporting column will be largely shifted, making it difficult to adjust the position of the gradient magnetic field coil. There was a problem that the bulk also increased.
【０００５】また、第３の従来例では、傾斜磁場コイル
を支える手段および傾斜磁場コイルの周囲に形成された
密閉空間を形成する手段が構成上複雑であり、また部品
点数も多くなる等して、装置全体も複雑な構成となりコ
ストも高くつく。そこで、本発明は上記課題を解決し、
簡単な構成で、空気伝搬だけでなく、固定伝搬を遮断し
た静音型の傾斜磁場ユニットおよび磁気共鳴イメージン
グ装置を提供することを目的する。In the third conventional example, the means for supporting the gradient magnetic field coil and the means for forming an enclosed space formed around the gradient magnetic field coil are complicated in structure, and the number of parts is increased. In addition, the entire apparatus has a complicated structure, and the cost is high. Then, the present invention solves the above-mentioned problems,
An object of the present invention is to provide a silent-type gradient magnetic field unit and a magnetic resonance imaging apparatus that have a simple configuration and block not only air propagation but also fixed propagation.
【０００６】[0006]
【課題を解決するための手段】上述の課題を解決するた
め、請求項１に記載の発明は、撮影空間に静磁場を生成
するための静磁場発生手段と、前記撮影空間に傾斜磁場
を生成するための傾斜磁場発生手段と、前記傾斜磁場発
生手段の周囲に形成された真空状態を保持するための密
閉手段と、前記撮影空間を確保するための隔壁と、前記
静磁場発生手段と傾斜磁場発生手段の間に介在して振動
の伝搬を抑制するための第１の防振部材と、前記静磁場
発生手段と前記隔壁の間に介在して振動の伝搬を抑制す
るための第２の防振部材と、を具備することを特徴とす
る。According to an aspect of the present invention, there is provided a static magnetic field generating means for generating a static magnetic field in an imaging space, and a gradient magnetic field generating means for generating a gradient magnetic field in the imaging space. Magnetic field generating means for performing the operation, sealing means for maintaining a vacuum state formed around the gradient magnetic field generating means, partition walls for securing the imaging space, the static magnetic field generating means and the gradient magnetic field A first vibration isolating member interposed between the generating means for suppressing propagation of vibration, and a second vibration isolating member interposed between the static magnetic field generating means and the partition for suppressing propagation of vibration. And a vibration member.
【０００７】本発明は上記構成により、傾斜磁場発生手
段の周囲を真空状態にし、傾斜磁場発生手段と静磁場発
生手段の間に設けられた第１の防振部材、および静磁場
発生手段と隔壁の間に設けられた第２の防振部材によ
り、空気伝搬だけでなく、固定伝搬を遮断することがで
きる。また、請求項１３に記載の発明は、撮影空間に傾
斜磁場を生成するための傾斜磁場発生手段と、前記傾斜
磁場発生手段の周囲に形成された真空状態を保持するた
めの密閉手段と、前記撮影空間を確保するための隔壁
と、前記撮影空間に静磁場を生成するための静磁場発生
手段と前記傾斜磁場発生手段の間に介在して振動の伝搬
を抑制するための第１の防振部材と、前記静磁場発生手
段と前記隔壁の間に介在して振動の伝搬を抑制するため
の第２の防振部材と、を具備することを特徴とする。According to the present invention, a first vibration damping member provided between the gradient magnetic field generating means and the static magnetic field generating means, the static magnetic field generating means and the partition wall are provided by setting the periphery of the gradient magnetic field generating means in a vacuum state by the above configuration. With the second vibration isolator provided between them, not only air propagation but also fixed propagation can be cut off. The invention according to claim 13 is characterized in that a gradient magnetic field generating means for generating a gradient magnetic field in an imaging space, a sealing means for maintaining a vacuum state formed around the gradient magnetic field generating means, and A partition for securing a photographing space, and a first vibration isolation for suppressing propagation of vibration by interposing between a static magnetic field generating means for generating a static magnetic field in the photographing space and the gradient magnetic field generating means. And a second vibration damping member interposed between the static magnetic field generating means and the partition wall to suppress the propagation of vibration.
【０００８】本発明は上記構成により、傾斜磁場発生手
段の周囲を真空状態にし、傾斜磁場発生手段と既存の静
磁場発生手段の間に設けられた第１の防振部材、および
静磁場発生手段と隔壁の間に設けられた第２の防振部材
により、空気伝搬だけでなく、固定伝搬を遮断すること
ができる。According to the present invention, a first vibration isolating member provided between the gradient magnetic field generating means and the existing static magnetic field generating means, and a static magnetic field generating means, wherein the periphery of the gradient magnetic field generating means is evacuated by the above structure. With the second vibration isolating member provided between the and the partition, not only air propagation but also fixed propagation can be cut off.
【０００９】[0009]
【発明の実施の形態】以下、本発明に係る第１の実施の
形態について、図面を参照して詳細に説明する。図１
（ａ）は、第１の実施の形態における磁気共鳴イメージ
ング装置を、被検体の挿入方向から見た一部切欠正面図
である。図１（ｂ）は、上図が図１（ａ）におけるＡ−
Ｏ断面図、下図がＯ−Ｂ断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment according to the present invention will be described in detail with reference to the drawings. FIG.
FIG. 2A is a partially cutaway front view of the magnetic resonance imaging apparatus according to the first embodiment, as viewed from a direction in which a subject is inserted. FIG. 1 (b) shows the upper diagram of FIG.
An O sectional view and a lower figure are OB sectional views.
【００１０】図１に示すように、本実施の形態では、患
者を挿入・配置する撮影空間Ｓを有したガントリ１９
と、このガントリ１９の撮影空間Ｓに被検体８を載せて
挿入される天板９と、ガントリ１９および天板９を有す
る図示しない寝台部の動作を制御するとともにＭＲ送受
信信号を制御、処理する図示しない制御・処理部とを備
える。ガントリ１９はその内側中央部に患者を挿入・配
置するための略円筒状の撮影空間Ｓを貫通して形成した
構造になっている。この略円筒状の撮影空間Ｓに対し
て、その軸方向をＺ方向とし、このＺ方向に直交する方
向をＸ、Ｙ方向とする。なお、Ｘ、Ｙ、Ｚ方向は図１
（ａ）に示されている。ガントリ１９は、撮影空間Ｓに
静磁場を生成する静磁場磁石を内部に備えた真空容器１
を備える。真空容器１に設けられた静磁場コイルは、例
えば超電導磁石で構成され、全体形状は所定径の略円筒
状に形成され、同様に真空容器１も円筒形に形成されて
いる。真空容器１は超伝導磁石に必要な極低温度、例え
ば略４Ｋを維持するために、通常略１０−３Torr以下の
高真空に保たれている。As shown in FIG. 1, in this embodiment, a gantry 19 having an imaging space S for inserting and arranging a patient is provided.
In addition, the operation of the table 9 into which the subject 8 is placed and inserted into the imaging space S of the gantry 19, and the operation of the couch (not shown) having the gantry 19 and the table 9 are controlled and the MR transmission and reception signals are controlled and processed. A control / processing unit (not shown) is provided. The gantry 19 has a structure formed so as to penetrate a substantially cylindrical imaging space S for inserting and arranging a patient at a central portion inside the gantry 19. The axial direction of the substantially cylindrical imaging space S is defined as a Z direction, and directions orthogonal to the Z direction are defined as X and Y directions. The X, Y and Z directions are shown in FIG.
This is shown in FIG. The gantry 19 is a vacuum vessel 1 having a static magnetic field magnet for generating a static magnetic field in the imaging space S.
Is provided. The static magnetic field coil provided in the vacuum vessel 1 is composed of, for example, a superconducting magnet, and has an overall shape formed in a substantially cylindrical shape having a predetermined diameter. Similarly, the vacuum vessel 1 is also formed in a cylindrical shape. The vacuum vessel 1 is usually maintained at a high vacuum of about 10 −3 Torr or less in order to maintain the extremely low temperature required for the superconducting magnet, for example, about 4K.
【００１１】真空容器１は、略円筒状の外周面に、４本
の脚体２７…２７を備え、この脚体２７…２７により設
置面としての床Ｆ上に支持されている。また、床Ｆはた
とえばコンクリート性の剛性の高い材料で形成されてい
る。真空容器１の内周側には、真空容器１の内径よりも
小さい外径を有する円筒形の傾斜磁場コイル２と、傾斜
磁場コイル２の内径よりも小さい外径を有する円筒形の
内筒４が設けられている。The vacuum vessel 1 has four legs 27... 27 on a substantially cylindrical outer peripheral surface, and is supported on a floor F as an installation surface by the legs 27. The floor F is made of, for example, a concrete-based material having high rigidity. A cylindrical gradient coil 2 having an outer diameter smaller than the inner diameter of the vacuum vessel 1 and a cylindrical inner cylinder 4 having an outer diameter smaller than the inner diameter of the gradient coil 2 are provided on the inner peripheral side of the vacuum vessel 1. Is provided.
【００１２】傾斜磁場コイル２は、巻線としてｘコイ
ル、ｙコイルおよびｚコイルを有し、それらをボビン上
に積層・含浸して形成したもので、全体として略円筒状
に形成されている。傾斜磁場コイル２は、支持ブラケッ
ト５、防振ゴム６および磁石インターフェース７からな
る接続部分を介して、真空容器１に取り付けられてい
る。なお詳しい説明は後述する。内筒４は、防振ゴム１
１、真空蓋３、Ｏリング１０、磁石インターフェース
７、ボルト２０、ワッシャー２１からなる接続部分を介
して、真空容器１に取り付けられており、真空容器１の
内周側と内筒４および真空蓋３とにより傾斜磁場コイル
２の周囲を真空に保つようになっている。なお、詳しい
説明は後述する。The gradient magnetic field coil 2 has an x-coil, a y-coil, and a z-coil as windings, and is formed by laminating and impregnating them on a bobbin, and has a substantially cylindrical shape as a whole. The gradient magnetic field coil 2 is attached to the vacuum vessel 1 via a connection portion including a support bracket 5, an anti-vibration rubber 6, and a magnet interface 7. A detailed description will be given later. The inner cylinder 4 is made of the vibration-proof rubber 1
1, a vacuum lid 3, an O-ring 10, a magnet interface 7, a bolt 20, and a washer 21 are attached to the vacuum vessel 1 via a connection portion, and the inner peripheral side of the vacuum vessel 1, the inner cylinder 4, and the vacuum lid. 3 keeps the area around the gradient coil 2 vacuum. A detailed description will be given later.
【００１３】また、真空蓋３の一部には、真空ホース１
７が取り付けられており、その先に真空ポンプ１８が設
けられている。つぎに、上述の傾斜磁場コイル２と真空
容器１の接続について詳しく説明する。傾斜磁場コイル
２は、Ｚ方向の両端に略円弧状の支持ブラケット５が、
ボルト等の接続具で接続されている。支持ブラケット５
は、Ｚ方向から見た場合、傾斜磁場コイル２の一部に沿
うような形である略円弧状であり、また、Ｘ方向から見
た断面は略Ｌ字型となっている。なお、略Ｌ字型の一辺
は、傾斜磁場コイル２の内周と外周の間の厚さと略同じ
長さであり、この部分に傾斜磁場コイル２と接続するた
めのボルト用の穴が設けられている。Further, a part of the vacuum lid 3 includes a vacuum hose 1.
7 is attached, and a vacuum pump 18 is provided in front of it. Next, the connection between the above-described gradient coil 2 and the vacuum vessel 1 will be described in detail. The gradient magnetic field coil 2 has substantially arc-shaped support brackets 5 at both ends in the Z direction.
They are connected by connecting tools such as bolts. Support bracket 5
Has a substantially arc shape along a part of the gradient magnetic field coil 2 when viewed from the Z direction, and has a substantially L-shaped cross section when viewed from the X direction. One side of the substantially L-shape is approximately the same length as the thickness between the inner circumference and the outer circumference of the gradient magnetic field coil 2, and a hole for a bolt for connecting to the gradient magnetic field coil 2 is provided in this portion. ing.
【００１４】また、前記Ｌ字型の他の一辺は、内周側に
くるように配置され、その外周側には、防振ゴム６が２
つ取り付けられている。Ｚ方向の両側にある支持ブラケ
ット５にそれぞれ取り付けられた計４つの防振ゴム６
は、略円筒状の真空容器１のＺ方向の両側に溶接などに
より接合された真空容器１と略同径の略環状の磁石イン
ターフェース７に取り付けられている。磁石インターフ
ェース７の形状は図１にこだわる必要がなく、上下非対
称でもよい。Further, the other side of the L-shape is disposed so as to be on the inner peripheral side, and two rubber cushions 6 are provided on the outer peripheral side thereof.
One is attached. Four anti-vibration rubbers 6 respectively attached to the support brackets 5 on both sides in the Z direction
Is attached to a substantially annular magnet interface 7 having substantially the same diameter as the vacuum vessel 1 joined to both sides in the Z direction of the substantially cylindrical vacuum vessel 1 by welding or the like. The shape of the magnet interface 7 does not need to be limited to FIG. 1 and may be vertically asymmetric.
【００１５】また、ここで支持ブラケット５および防振
ゴム６は天板９よりも下部の空間に設けられている。こ
れにより、天板９より上部の密閉空間は下部の密閉空間
に比べ体積を小さくすることができ、図１に示されると
おり、真空蓋３の上部を撮影空間Ｓ側に切り込ませて作
成することができ、被検体８が上部を向いた状態でガン
トリ１９内に挿入される際、圧迫感を和らげることがで
きる。なお、さらに、防振ゴム６は傾斜磁場コイル２の
重量を下部から支える役目も有している。したがって、
傾斜磁場コイル２と真空容器１の接続は、傾斜磁場コイ
ル２に支持ブラケット５を設け、支持ブラケット５に防
振ゴム６を取り付け、防振ゴム６に磁石インターフェー
ス７を取り付け、磁石インターフェース７に真空容器１
が接合されている。なお、ここで接続の順序が特に限定
されるわけではない。Here, the support bracket 5 and the vibration isolating rubber 6 are provided in a space below the top plate 9. Thereby, the volume of the closed space above the top plate 9 can be made smaller than that of the closed space below, and as shown in FIG. 1, the closed space is formed by cutting the upper portion of the vacuum lid 3 into the photographing space S side. When the subject 8 is inserted into the gantry 19 with the subject 8 facing upward, the feeling of oppression can be reduced. Further, the vibration isolating rubber 6 also has a role of supporting the weight of the gradient coil 2 from below. Therefore,
The gradient magnetic field coil 2 and the vacuum vessel 1 are connected by providing a support bracket 5 on the gradient magnetic field coil 2, attaching an anti-vibration rubber 6 to the support bracket 5, attaching a magnet interface 7 to the anti-vibration rubber 6, and attaching a vacuum to the magnet interface 7. Container 1
Are joined. Here, the order of connection is not particularly limited.
【００１６】つぎに、上述の真空容器１と内筒４の接続
について、真空容器１と真空蓋３の接続、および真空蓋
３と内筒４の接続に分けて、詳しく説明する。図２は、
図１（ｂ）における真空容器１に設けられた磁石インタ
ーフェース７と真空蓋３の接続部の拡大図である。真空
容器１と真空蓋３の接続は、真空容器１に設けられた前
記磁石インターフェース７に真空蓋３からボルト２０と
ワッシャー２１で締め付けて固定する構造である。Next, the connection between the above-described vacuum vessel 1 and the inner cylinder 4 will be described in detail separately for the connection between the vacuum vessel 1 and the vacuum lid 3 and the connection between the vacuum lid 3 and the inner cylinder 4. FIG.
FIG. 2 is an enlarged view of a connection portion between a magnet interface 7 and a vacuum lid 3 provided in the vacuum vessel 1 in FIG. The connection between the vacuum vessel 1 and the vacuum lid 3 has a structure in which the vacuum interface 3 is fixed to the magnet interface 7 provided in the vacuum vessel 1 by tightening the vacuum lid 3 with bolts 20 and washers 21.
【００１７】真空蓋３は、内筒４と真空容器１の口径の
差による隙間を、Ｚ方向の両側から密閉するためのもの
で、外径は真空容器１の径と略同じ程度、内径は内筒４
の径と略同じ程度の略環状の形状である。また、真空蓋
３の磁石インターフェース７側には、真空蓋３の周回に
沿うように略環状の溝が設けられており、前記略環状の
溝にＯリング１０が設けられている。Ｏリング１０は、
真空蓋３と磁石インターフェース７の密閉性を高めるた
めに用いられている。また、真空蓋３の周回上には、ボ
ルト２０を締め付けるための穴が設けられている。The vacuum lid 3 is used to seal a gap due to a difference in diameter between the inner cylinder 4 and the vacuum vessel 1 from both sides in the Z direction. The outer diameter is approximately the same as the diameter of the vacuum vessel 1 and the inner diameter is Inner cylinder 4
And a substantially annular shape having a diameter substantially equal to the diameter of the ring. On the magnet interface 7 side of the vacuum lid 3, a substantially annular groove is provided along the circumference of the vacuum lid 3, and an O-ring 10 is provided in the substantially annular groove. O-ring 10
It is used to enhance the tightness between the vacuum lid 3 and the magnet interface 7. A hole for tightening the bolt 20 is provided on the circumference of the vacuum lid 3.
【００１８】つぎに、真空蓋３と内筒４の接続について
説明する。図３は真空蓋３と内筒４の接続部の拡大図で
ある。真空蓋３と内筒４の間には、防振ゴム１１が設け
られている。防振ゴム１１は、内径が真空蓋３の内径お
よび内筒４の内径と略同じ程度の略環状の形状で、Ｘ方
向から見た断面は略Ｌ字型である。真空蓋３および内筒
４は、防振ゴム１１をＹ方向から挟み且つＺ方向からも
挟むことができる構造となっている。防振ゴム１１をＺ
方向から挟むことにより、図１（ｂ）および図３中の矢
印Ａ７で示される外気圧と真空圧の圧力差により生じる
力により、真空蓋３および内筒４を密閉、接続すること
ができる。Next, the connection between the vacuum lid 3 and the inner cylinder 4 will be described. FIG. 3 is an enlarged view of a connection portion between the vacuum lid 3 and the inner cylinder 4. An anti-vibration rubber 11 is provided between the vacuum lid 3 and the inner cylinder 4. The anti-vibration rubber 11 has a substantially annular shape whose inner diameter is substantially the same as the inner diameter of the vacuum lid 3 and the inner diameter of the inner cylinder 4, and has a substantially L-shaped cross section as viewed in the X direction. The vacuum lid 3 and the inner cylinder 4 have a structure capable of sandwiching the vibration isolating rubber 11 from the Y direction and also from the Z direction. Anti-vibration rubber 11
By sandwiching from the direction, the vacuum lid 3 and the inner cylinder 4 can be sealed and connected by a force generated by a pressure difference between the outside air pressure and the vacuum pressure indicated by an arrow A7 in FIG. 1B and FIG.
【００１９】また、防振ゴム１１をＹ方向から挟むこと
により、Ｙ方向からの力、例えば内筒４または被検体８
の重量などの力から、内筒４を保持することができる。
なお、Ｌ字型の各部分の長さは、内筒４に多少の力たと
えば内筒４の重量または被検体の体重程度が加わっても
変形しにくく、内筒４と真空蓋３が外れないような長さ
にしておく。By sandwiching the vibration isolating rubber 11 in the Y direction, a force in the Y direction, for example, the inner cylinder 4 or the subject 8
The inner cylinder 4 can be held by a force such as weight.
The length of each part of the L-shape is difficult to be deformed even if a slight force is applied to the inner cylinder 4, for example, the weight of the inner cylinder 4 or the weight of the subject, and the inner cylinder 4 and the vacuum lid 3 do not come off. Keep it to such a length.
【００２０】また、防振ゴム１１の真空蓋３側および内
筒４側のそれぞれ対向する位置には、凸部１１ａが設け
られている。なお、図３では、使用前の形状を示すため
点線で円弧状に凸部１１ａを描いているが、実施に使用
される際には、真空蓋３と円筒４の間につぶれた形状で
挿入される。凸部１１ａは、防振ゴム１１の周回に沿う
ような略環状の形状であり、真空蓋３と内筒４を密閉す
ることができ、真空度を高めるために使用されている。
また、防振ゴム１１が円筒４と接する面のうち凸部１１
ａ以外の面には、Ｘ方向から見た断面が防振ゴム１１の
Ｌ字型に沿うようなクランク型をしており、Ｚ方向から
見た断面が、撮影空間Ｓを周回するような略環状である
剛性の高いフランジ１１ｂが設けられている。フランジ
１１ｂは内筒４が外力により動いた際の防振ゴム１１の
変形を防止するために設けられており、必要に応じて使
用・不使用を選択すればよい。Further, convex portions 11a are provided at positions of the vibration isolating rubber 11 facing the vacuum lid 3 and the inner cylinder 4, respectively. In FIG. 3, the convex portion 11 a is drawn in an arc shape by a dotted line to show the shape before use, but when it is used for implementation, the convex portion 11 a is inserted between the vacuum lid 3 and the cylinder 4 in a collapsed shape. Is done. The convex portion 11a has a substantially annular shape along the circumference of the vibration-isolating rubber 11, can seal the vacuum lid 3 and the inner cylinder 4, and is used for increasing the degree of vacuum.
Also, of the surface where the vibration isolating rubber 11 contacts the cylinder 4,
On the surface other than a, the section viewed from the X direction has a crank shape along the L-shape of the vibration isolating rubber 11, and the section viewed from the Z direction has a substantially circular shape around the photographing space S. An annular rigid flange 11b is provided. The flange 11b is provided to prevent deformation of the vibration isolating rubber 11 when the inner cylinder 4 is moved by an external force, and may be used or not used as needed.
【００２１】つぎに、本実施の形態の作用および効果を
説明する。まず、真空ポンプ１８を作動させて、傾斜磁
場コイル２を囲む内筒４と真空容器１真空蓋３の間の密
閉空間の排気を行い、密閉空間内に所定値の真空状態を
つくる。真空状態の前記密閉空間は振動(すなわち騒音)
の空気伝搬を遮断するために設けられており、その真空
度は上述の真空容器１内の真空度に比べて低くてもよ
い。例えば、数Torr程度でも良い。なお、以下に１気圧
の空気と比較した空気伝搬の遮音効果の式を示す。 Ｉ＝20×log10（P/760）[dB]Next, the operation and effect of this embodiment will be described. First, the vacuum pump 18 is operated to evacuate the sealed space between the inner cylinder 4 surrounding the gradient magnetic field coil 2 and the vacuum lid 3 of the vacuum vessel 1 to create a predetermined vacuum state in the sealed space. The enclosed space in a vacuum state vibrates (i.e., noises)
The degree of vacuum may be lower than the degree of vacuum in the vacuum vessel 1 described above. For example, it may be about several Torr. The equation of the sound insulation effect of air propagation compared to air at 1 atm is shown below. I = 20 × log 10 (P / 760) [dB]
【００２２】ここで、Ｉは遮音率、Ｐは真空度である。
たとえば、密閉空間の真空度を略0.7Torrとすると、１
気圧の空気による遮音に比べ約60dBの遮音効果を得るこ
とができる。また、真空容器１内に設けられた静磁場コ
イルに流れる電流により撮影空間Ｓに静磁場が生成され
ており、天板９上に横になった被検体８が撮影空間Ｓ内
に挿入される。このとき天板９は、内筒４に設けられた
図示しない天板レールによりガイド・支持されても良い
し、内筒４には、直接被検体８の体重がかからないよう
なその他の支持構造であってもよい。Here, I is the sound insulation rate, and P is the degree of vacuum.
For example, if the degree of vacuum in the enclosed space is approximately 0.7 Torr, then 1
The sound insulation effect of about 60dB can be obtained compared with the sound insulation by the air of the atmospheric pressure. In addition, a static magnetic field is generated in the imaging space S by a current flowing through a static magnetic field coil provided in the vacuum vessel 1, and the subject 8 lying on the top 9 is inserted into the imaging space S. . At this time, the top plate 9 may be guided and supported by a top plate rail (not shown) provided on the inner cylinder 4, or the inner cylinder 4 may have another support structure that does not directly apply the weight of the subject 8. There may be.
【００２３】ついでＲＦコイルの設置、スライス面の位
置決めなどの必要な準備がなされた後、診断が開始され
る。つまり、制御・処理部から所望のパルスシーケンス
に応じて制御指令がガントリの各要素に出されて、被検
体８からのＭＲ信号が受信される。このＭＲ信号に基づ
いて画像データが再構成される。このパルスシーケンス
に基づく駆動状態において、傾斜磁場コイル２には急峻
に立ち上がりまた立ち下がるパルス電流が供給される。
とくに、パルスシーケンスが高速撮影用のシーケンスで
ある場合、かかるパルス電流の極性が高速に反転され
る。傾斜磁場コイル２は強い静磁場中に置かれているか
ら、これに高速で変化するパルス電流が流れる度に電磁
気力が発生し、この電磁気力により振動が発生する。電
磁気力の大きさはｘコイル、ｙコイル、ｚコイルの位置
などに応じて複雑に異なるから、傾斜磁場コイル２は通
常複雑なモードで振動する。Then, after necessary preparations such as installation of an RF coil and positioning of a slice plane are performed, diagnosis is started. That is, a control command is issued from the control / processing unit to each element of the gantry according to a desired pulse sequence, and an MR signal from the subject 8 is received. Image data is reconstructed based on the MR signal. In the drive state based on this pulse sequence, a pulse current that rises and falls sharply is supplied to the gradient coil 2.
In particular, when the pulse sequence is a sequence for high-speed imaging, the polarity of the pulse current is reversed at high speed. Since the gradient magnetic field coil 2 is placed in a strong static magnetic field, an electromagnetic force is generated each time a pulse current that changes at a high speed flows through the coil, and a vibration is generated by the electromagnetic force. Since the magnitude of the electromagnetic force varies in a complicated manner depending on the positions of the x coil, the y coil, the z coil, etc., the gradient magnetic field coil 2 normally vibrates in a complicated mode.
【００２４】傾斜磁場コイル２が振動しても、本実施の
形態の場合傾斜磁場コイル２は真空空間に置かれている
ので、その周りの空気が振動するということがない。つ
まり、図１（ｂ）中の矢印Ａ１で示すような振動の空気
伝搬が確実に排除、抑制され、外部に伝わる振動が著し
く軽減される。Even if the gradient magnetic field coil 2 vibrates, in the case of the present embodiment, since the gradient magnetic field coil 2 is placed in the vacuum space, the air around it does not vibrate. That is, the air propagation of the vibration as indicated by the arrow A1 in FIG. 1B is reliably eliminated and suppressed, and the vibration transmitted to the outside is significantly reduced.
【００２５】これに対して、傾斜磁場コイル２の振動
は、支持ブラケット５を介して固体伝搬し、外部に漏れ
ようとする。しかしながら、この固体伝搬に対しても上
述したように種々の振動吸収を行っているので、漏れ出
る振動は非常に小さくなる。まず、傾斜磁場コイル２を
下端から支持しているＺ軸方向両端の支持ブラケット５
に設けられた防振ゴム６により振動が吸収されるため、
真空容器１に設けられた磁石インターフェース７への振
動の伝達が抑制される。防振ゴム６で取り切れなかった
振動のみが磁石インターフェース７に伝搬する。On the other hand, the vibration of the gradient coil 2 propagates through the support bracket 5 and leaks to the outside. However, as described above, various vibrations are absorbed in this solid propagation, so that the leaked vibrations are very small. First, support brackets 5 at both ends in the Z-axis direction that support the gradient coil 2 from the lower end.
The vibration is absorbed by the vibration isolating rubber 6 provided in the
Transmission of vibration to the magnet interface 7 provided in the vacuum vessel 1 is suppressed. Only the vibration that cannot be removed by the vibration isolating rubber 6 propagates to the magnet interface 7.
【００２６】磁石インターフェース７に伝搬された振動
は、図２中の矢印Ａ２に示されるように、磁石インター
フェース７にボルト２０で取り付けられた真空蓋３に導
かれる。真空蓋３に導かれた振動は、つぎに図３中の矢
印Ａ３に示されるように内筒４に伝搬しようとするが、
真空蓋３と内筒４の間には防振ゴム１１が設けられてい
るため、振動の固定伝搬が抑制され、真空蓋３から内筒
４に伝わる振動が著しく軽減される。また、防振ゴム１
１は、上述のように、外気圧と真空圧の圧力差によって
真空空間は密閉され、また、真空蓋３と内筒４でＹ方向
に挟まれる構造により、ボルト等の接続具を使用しなく
ても、内筒４を保持することができる。The vibration transmitted to the magnet interface 7 is guided to the vacuum lid 3 attached to the magnet interface 7 with bolts 20, as shown by an arrow A2 in FIG. The vibration guided to the vacuum lid 3 then tries to propagate to the inner cylinder 4 as shown by an arrow A3 in FIG.
Since the anti-vibration rubber 11 is provided between the vacuum lid 3 and the inner cylinder 4, fixed propagation of vibration is suppressed, and the vibration transmitted from the vacuum lid 3 to the inner cylinder 4 is significantly reduced. Also, anti-vibration rubber 1
1 is that, as described above, the vacuum space is sealed by the pressure difference between the outside air pressure and the vacuum pressure, and the structure is sandwiched between the vacuum lid 3 and the inner cylinder 4 in the Y direction. Thus, the inner cylinder 4 can be held.
【００２７】一般的に、接続具を用いた場合には、接続
具を介して固定振動が伝搬されるが、本実施の形態で
は、真空蓋３と内筒４の接続には防振ゴム以外の接続具
を用いていないため、固定伝搬を著しく減少させること
ができる。本実施の形態では、（１）とくに振動の大き
い傾斜磁場コイル２から発生する振動（すなわち騒音）
の空気伝搬を真空空間の生成により大幅に遮断し、
（２）かかる振動を傾斜磁場コイル２に設けられた支持
ブラケット５と磁石インターフェース７の間に備えられ
た防振ゴム６で極力除去し、（３）残った振動も真空蓋
３と内筒４の間に備えられた防振ゴム１１で確実に除去
する。In general, when a connecting tool is used, fixed vibration is propagated through the connecting tool. In the present embodiment, however, the connection between the vacuum lid 3 and the inner cylinder 4 is made by means other than the vibration-proof rubber. The fixed propagation can be remarkably reduced because the connecting device of (1) is not used. In the present embodiment, (1) vibration (ie, noise) generated from the gradient coil 2 having particularly large vibration
The air propagation of is greatly cut off by creating a vacuum space,
(2) Such vibrations are eliminated as much as possible by the vibration-proof rubber 6 provided between the support bracket 5 provided on the gradient coil 2 and the magnet interface 7. (3) The remaining vibrations are also removed from the vacuum lid 3 and the inner cylinder 4. It is surely removed by the anti-vibration rubber 11 provided between them.
【００２８】これにより、ガントリ１９全体の騒音はも
ちろん、特に、被検体８の近くにある内筒４の振動によ
る騒音を抑えることができ、高速パルスシーケンスを使
う場合であっても、傾斜磁場コイル２の振動に起因した
振動および騒音を格段に低減させることができ、特に、
内筒４の内側にいる被検体８に与える不安感や不快感を
良好に解消することができる。また、傾斜磁場コイル２
を支えるブラケット５、防振ゴム６は天板９の下部にの
み存在し、真空蓋３の上部が撮影空間S側に切り込んだ
形となって外部に広い空間を作っているため、被検体に
開放感を与えている。Thus, not only the noise of the entire gantry 19 but also the noise caused by the vibration of the inner cylinder 4 near the subject 8 can be suppressed. Even when a high-speed pulse sequence is used, the gradient magnetic field coil can be used. 2 can significantly reduce the vibration and noise caused by the vibration,
Anxiety and discomfort given to the subject 8 inside the inner cylinder 4 can be favorably eliminated. Also, the gradient magnetic field coil 2
The bracket 5 and the vibration isolating rubber 6 that support the camera are provided only at the lower part of the top plate 9, and the upper part of the vacuum lid 3 is cut into the imaging space S to create a wide space outside, so Gives a sense of openness.
【００２９】次に、本発明に係る第１の実施の形態の第
１の変形例について、図面を参照して説明する。なお、
第１の実施の形態と同一構成のものは同一番号を付して
詳しい説明は省略する。本変形例は、磁石インターフェ
ース７と真空蓋３の接続部分の変形例であり、拡大図と
して、図４に示されている。Next, a first modification of the first embodiment according to the present invention will be described with reference to the drawings. In addition,
Components having the same configuration as the first embodiment are denoted by the same reference numerals, and detailed description is omitted. This modification is a modification of the connection portion between the magnet interface 7 and the vacuum lid 3, and is shown in FIG. 4 as an enlarged view.
【００３０】第１の実施の形態では、図２に示すよう
に、磁石インターフェース７と真空蓋３が接している構
造であるが、本実施の形態では、磁石インターフェース
７と真空蓋３の間に密閉用防振ゴム１２を設ける。密閉
用防振ゴム１２は磁石インターフェース７と真空蓋３の
間を密閉する役割を果たしている。密閉用防振ゴム１２
は外気圧と真空圧の圧力差によって磁石インターフェー
ス７と真空蓋３の間に強く挟まれ固定される。またさら
に、密閉用防振ゴム１２には、凸部１２ａが設けられて
いる。凸部１２ａは、防振ゴムの真空蓋３側および磁石
インターフェース７側のそれぞれ対向する位置に設けら
れている。凸部１２ａは、密閉用防振ゴム１２の周回に
沿うような略環状の形状であり、真空蓋３と磁石インタ
ーフェース７を密閉することができ、真空度を高めるた
めに使用されている。密閉用防振ゴム１２は撮影空間Ｓ
を周回するような略環状のものである。In the first embodiment, as shown in FIG. 2, the structure is such that the magnet interface 7 and the vacuum lid 3 are in contact with each other. An anti-vibration rubber 12 for sealing is provided. The sealing rubber 12 serves to seal the space between the magnet interface 7 and the vacuum lid 3. Anti-vibration rubber for sealing 12
Is strongly sandwiched and fixed between the magnet interface 7 and the vacuum lid 3 due to the pressure difference between the outside air pressure and the vacuum pressure. Further, the anti-vibration rubber 12 for sealing is provided with a convex portion 12a. The protrusions 12a are provided at positions facing each other on the vacuum lid 3 side and the magnet interface 7 side of the vibration-proof rubber. The convex portion 12a has a substantially annular shape along the circumference of the vibration isolating rubber 12 for sealing, and can seal the vacuum lid 3 and the magnet interface 7 and is used to increase the degree of vacuum. The anti-vibration rubber 12 for sealing is in the shooting space S
The ring is a substantially annular one.
【００３１】密閉用防振ゴム１２を設けた場合、図４中
の矢印Ａ４に示されるように、振動は、磁石インターフ
ェース７から真空蓋３に伝搬しようとするが、密閉用防
振ゴム１２により、振動の固定伝搬が抑制される。ま
た、ワッシャー２１と真空蓋３の間にワッシャー型の防
振ゴム１４を設けても良い。防振ゴム１４を設けた場
合、図中の矢印Ａ５に示されるように、振動は、磁石イ
ンターフェース７からボルト２０、ワッシャー２１を介
して真空蓋３に伝搬しようとするが、防振ゴム１４によ
り、振動の固定伝搬が抑制される。When the vibration isolating rubber 12 is provided, vibration tends to propagate from the magnet interface 7 to the vacuum lid 3 as shown by an arrow A4 in FIG. In addition, fixed propagation of vibration is suppressed. Further, a washer-type anti-vibration rubber 14 may be provided between the washer 21 and the vacuum lid 3. When the vibration isolating rubber 14 is provided, the vibration tries to propagate from the magnet interface 7 to the vacuum lid 3 via the bolt 20 and the washer 21 as shown by an arrow A5 in the drawing. In addition, fixed propagation of vibration is suppressed.
【００３２】なお、防振ゴム１４を使用すると、防振効
果は大きくなるが、必要に応じて使用・不使用を決定す
れば良い。本変形例では、真空蓋３と磁石インターフェ
ース７間に密閉用防振ゴム１２を用いることにより、第
１の実施の形態の効果に加え、Ｏリングを用いずに、真
空蓋３と磁石インターフェース７を密閉することができ
ると同時に、磁石インターフェース７から真空蓋３への
固定振動を抑制することができ、振動による騒音をさら
に抑えることができる。次に、本発明に係る第１の実施
の形態の第２の変形例について、図面を参照して説明す
る。なお、第１の実施の形態および第１の変形例と同一
構成のものは同一番号を付して詳しい説明は省略する。The use of the anti-vibration rubber 14 increases the anti-vibration effect. However, it is sufficient to determine whether to use or not to use the anti-vibration rubber 14 as needed. In the present modified example, by using the vibration isolating rubber 12 for sealing between the vacuum lid 3 and the magnet interface 7, in addition to the effect of the first embodiment, the vacuum lid 3 and the magnet interface 7 can be used without using an O-ring. At the same time, the fixed vibration from the magnet interface 7 to the vacuum lid 3 can be suppressed, and the noise due to the vibration can be further suppressed. Next, a second modification of the first embodiment according to the present invention will be described with reference to the drawings. The same components as those in the first embodiment and the first modified example are denoted by the same reference numerals, and detailed description is omitted.
【００３３】本変形例は、磁石インターフェース７と真
空蓋３の接続部分の変形例であり、拡大図として、図５
に示されている。本変形例では、第１の変形例における
磁石インターフェース７のボルト２０が取り付けられた
部分よりもさらに外周側に、ボルト２２とワッシャー２
３により、Ｘ方向から見た断面は略Ｌ字型であるブラケ
ット１５を設ける。ブラケット１５は、Ｚ方向から見た
場合、真空蓋３の下側にあり真空蓋３の重量を支えてい
る。ブラケット１５と真空蓋３の間には支持用防振ゴム
１６が設けられている。真空蓋３の重量は、真空蓋３の
下部に設けられた支持用防振ゴム１６を介して、ブラケ
ット１５により充分支えることができる。ブラケット１
５および支持用防振ゴム１６は真空蓋３の周囲全体に配
置する必要はなく、例えば図１の傾斜磁場コイル２の重
量を支えるために用いた防振ゴム６のように、真空蓋３
の下部の２ヶ所（Ｚ方向に２ヶ所で合計４ヶ所）に設け
られていればよい。This modified example is a modified example of a connection portion between the magnet interface 7 and the vacuum lid 3, and is an enlarged view of FIG.
Is shown in In the present modification, the bolt 22 and the washer 2 are further disposed on the outer peripheral side than the portion where the bolt 20 of the magnet interface 7 in the first modification is attached.
According to 3, a bracket 15 having a substantially L-shaped cross section as viewed in the X direction is provided. The bracket 15 is below the vacuum lid 3 and supports the weight of the vacuum lid 3 when viewed from the Z direction. A supporting anti-vibration rubber 16 is provided between the bracket 15 and the vacuum lid 3. The weight of the vacuum lid 3 can be sufficiently supported by the bracket 15 via a vibration isolating rubber 16 for support provided below the vacuum lid 3. Bracket 1
It is not necessary to dispose the vibration damping rubber 5 and the supporting anti-vibration rubber 16 around the entire circumference of the vacuum lid 3. For example, like the vibration isolating rubber 6 used to support the weight of the gradient magnetic field coil 2 in FIG.
It is only necessary to be provided at the two lower positions (two positions in the Z direction, a total of four positions).
【００３４】また、図中の矢印Ａ６に示されるように、
振動はブラケット１５から真空蓋３に伝搬しようとする
が、支持用防振ゴム１６により振動の伝搬が抑制され
る。支持用防振ゴム１６とブラケット１５の間には図示
していない支持用防振ゴム１６の高さ調整機能があり、
装置を組み立てるときには真空蓋３を支持用防振ゴム１
６に載せ、高さ調整機能により真空蓋３が中心に位置す
るように調整し、ボルト２０で軽く締め付けてから真空
に引くことにより、密閉用防振ゴム１２が真空蓋３と磁
石インターフェース７により両側からしっかりと押しつ
けられ密閉される。Further, as indicated by an arrow A6 in the figure,
The vibration tends to propagate from the bracket 15 to the vacuum lid 3, but the propagation of the vibration is suppressed by the supporting vibration-proof rubber 16. There is a height adjustment function of the support anti-vibration rubber 16 (not shown) between the support anti-vibration rubber 16 and the bracket 15.
When assembling the device, the vacuum lid 3 is used to support the anti-vibration rubber 1
6, the vacuum lid 3 is adjusted to the center position by the height adjusting function, lightly tightened with bolts 20 and then evacuated. Pressed tightly from both sides and sealed.
【００３５】支持用防振ゴム１６は数１００ｋｇ以上の
傾斜磁場コイル２の重量を支えるため比較的剛性の大き
なゴムを必要とするが、部分的な支持により接触面積を
小さくして振動の伝搬を効果的に軽減することができ、
真空蓋３の全周に配置され接触面積の大きな密閉用防振
ゴム１２は、単位面積当たりに加わる力が支持用防振ゴ
ム１６ほど大きくないので、比較的剛性の小さな柔らか
いゴムを用い振動の伝搬を効果的に抑制できる。本変形
例では、第１の実施の形態および第１の変形例の効果に
加え、真空蓋３に重い重量が加わった場合でも、真空蓋
３を確実に支持した状態で、第１の実施の形態および第
１の変形例と同様、振動を抑制することができる。The supporting anti-vibration rubber 16 needs rubber having relatively large rigidity to support the weight of the gradient magnetic field coil 2 of several hundred kg or more. Can be effectively reduced,
Since the force applied per unit area of the rubber vibration isolating rubber 12 having a large contact area and arranged around the entire periphery of the vacuum lid 3 is not as large as that of the rubber vibration isolating rubber 16 for support, soft rubber having relatively small rigidity is used. Propagation can be effectively suppressed. In the present modified example, in addition to the effects of the first embodiment and the first modified example, even when a heavy weight is applied to the vacuum lid 3, the first embodiment is performed with the vacuum lid 3 securely supported. Vibration can be suppressed as in the embodiment and the first modification.
【００３６】次に、本発明に係る第１の実施の形態の第
３の変形例について、図面を参照して説明する。なお、
第１の実施の形態と同一構成のものは同一番号を付して
詳しい説明は省略する。本変形例は、真空蓋３と内筒４
の接続部分の変形例であり、拡大図として、図６に示さ
れている。第１の実施の形態では、密閉機能および支持
機能の両機能をもつ防振ゴム１１を用いていたのに対
し、内筒４の重量を支えるための支持用防振ゴム２５と
密閉するための密閉用防振ゴム２４とが別に用いられ
る。支持用防振ゴム２５は内筒４の周囲全体に配置する
必要はなく、たとえば図１の傾斜磁場コイル２の重量を
支えるために用いた防振ゴム６のように、内筒４の下部
の２ヶ所（Z方向に２ヶ所で合計４ヶ所)に設けられてい
ればよい。Next, a third modification of the first embodiment according to the present invention will be described with reference to the drawings. In addition,
Components having the same configuration as the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In this modification, the vacuum lid 3 and the inner cylinder 4
Is a modified example of the connection portion of FIG. 6, and is shown in FIG. 6 as an enlarged view. In the first embodiment, the anti-vibration rubber 11 having both the sealing function and the supporting function is used, but the anti-vibration rubber 25 for supporting the weight of the inner cylinder 4 and the anti-vibration rubber 25 for sealing are used. The sealing rubber 24 is used separately. It is not necessary to dispose the supporting anti-vibration rubber 25 over the entire circumference of the inner cylinder 4. For example, like the anti-vibration rubber 6 used to support the weight of the gradient magnetic field coil 2 in FIG. It suffices if it is provided at two places (two places in the Z direction, a total of four places).
【００３７】一方、密閉用防振ゴム２４は略円環状に撮
影空間Sを周回するように設けられ、大気圧と真空圧の
圧力差によって真空蓋３と内筒４に強く挟まれ固定され
る。さらに、真空蓋３と内筒４の密閉を確実にして真空
度を高めるために、密閉用防振ゴム２４の真空蓋３側お
よび内筒４側のそれぞれ対向する位置には凸部２４ａを
設けてもよい。本変形例では、第１の実施の形態の効果
に加え、接触面積の小さな支持用防振ゴム２５には比較
的剛性の高いゴムを使用し、円環状の接触面積の大きな
密閉用防振ゴム２４には比較的剛性の小さなゴムを用い
ることにより、剛性の高いフランジを設けなくても、防
振ゴム１１の変形を防止することができ、また、支持用
防振ゴム２５および密閉用防振ゴム２４の剛性を調整す
ることにより、振動の伝搬に対し効果的な抑制が可能で
ある。On the other hand, the vibration isolating rubber 24 for sealing is provided so as to orbit around the photographing space S in a substantially annular shape, and is strongly sandwiched and fixed between the vacuum lid 3 and the inner cylinder 4 by a pressure difference between the atmospheric pressure and the vacuum pressure. . Further, in order to ensure the sealing between the vacuum lid 3 and the inner cylinder 4 and increase the degree of vacuum, convex portions 24a are provided at opposing positions on the vacuum lid 3 side and the inner cylinder 4 side of the vibration isolating rubber 24 for sealing. You may. In this modified example, in addition to the effects of the first embodiment, a relatively rigid rubber is used for the supporting vibration isolating rubber 25 having a small contact area, and a sealing vibration isolating rubber having a large annular contact area is used. By using rubber having relatively small rigidity for the rubber 24, it is possible to prevent deformation of the vibration isolating rubber 11 without providing a flange having high rigidity. By adjusting the rigidity of the rubber 24, the propagation of vibration can be effectively suppressed.
【００３８】次に、本発明に係る第１の実施の形態の第
４の変形例について、図面を参照して説明する。なお、
第１の実施の形態と同一構成のものは同一番号を付して
詳しい説明は省略する。本変形例は、傾斜磁場コイル２
と真空容器１との接続部分の変形例であり、拡大図とし
て、図７に示されている。なお、図７では、磁石インタ
ーフェース７と真空蓋３の接続部分は、上述の第２の変
形例が記載されている。Next, a fourth modification of the first embodiment according to the present invention will be described with reference to the drawings. In addition,
Components having the same configuration as the first embodiment are denoted by the same reference numerals, and detailed description is omitted. In this modification, the gradient coil 2
FIG. 7 is a modified example of a connection part between the vacuum vessel 1 and the vacuum vessel 1, and is shown in FIG. 7 as an enlarged view. In FIG. 7, the connection portion between the magnet interface 7 and the vacuum lid 3 is described in the above-described second modification.
【００３９】本変形例では、傾斜磁場コイル２の下部で
Ｚ方向の両端に各１個または２個あるいはそれ以上の複
数の防振ゴム２６が配置され、防振ゴム２６は傾斜磁場
コイル２の重量で押しつけられて真空容器１に接続され
ている。真空容器１の防振ゴム２６が接触する部分およ
びその周囲は、傾斜磁場コイルの重量を支えかつ防振ゴ
ム２６を伝搬する振動を押さえるに十分な剛性を持った
構造に作られている。本変形例では、第１の実施の形態
の効果に加え、第１の実施の形態で用いられている支持
ブラケット５を用いることなく、実施することができ、
非常に単純でコストも安価になる利点がある。In this modification, one or two or more anti-vibration rubbers 26 are arranged at both ends in the Z direction below the gradient magnetic field coil 2, and the anti-vibration rubber 26 is It is pressed by weight and connected to the vacuum vessel 1. The portion of the vacuum vessel 1 in contact with the anti-vibration rubber 26 and its surroundings are made to have a structure having sufficient rigidity to support the weight of the gradient magnetic field coil and to suppress the vibration propagating through the anti-vibration rubber 26. In this modification, in addition to the effects of the first embodiment, the present embodiment can be implemented without using the support bracket 5 used in the first embodiment.
There is an advantage that the cost is very simple and the cost is low.
【００４０】なお、上述の実施の形態および変形例で
は、防振機能に加え密封機能を有する防振部材にはゴム
系の材料が適しているため、防振部材として一例である
防振ゴムを用いて説明したが、振動を抑制する部材であ
ればゴム系の材料に限定されない。また、既存の磁気共
鳴イメージング装置における静磁場コイルをガントリに
残し、傾斜磁場コイル２、真空蓋３、内筒４を含む装置
を傾斜磁場ユニットとし、取り付けることも可能であ
る。この場合には、既存の磁気共鳴イメージング装置に
おける静磁場コイルを利用することができる。In the above-described embodiments and modifications, since a rubber-based material is suitable for the vibration-proof member having a sealing function in addition to the vibration-proof function, the vibration-proof rubber, which is an example, is used as the vibration-proof member. Although the description has been given using the member, the member is not limited to the rubber-based material as long as the member suppresses vibration. Further, it is also possible to leave the static magnetic field coil in the existing magnetic resonance imaging apparatus in the gantry and mount the apparatus including the gradient magnetic field coil 2, the vacuum lid 3, and the inner cylinder 4 as a gradient magnetic field unit. In this case, a static magnetic field coil in an existing magnetic resonance imaging apparatus can be used.
【００４１】また、なお、上述の実施の形態および変形
例では、前記傾斜磁場発生手段の周囲に形成された真空
状態を保持するための密閉手段に、環状の真空蓋３を用
いたが、真空状態にできる構成であれば、特に形状等は
限定されない。In the above-described embodiment and modifications, the annular vacuum lid 3 is used as the sealing means for maintaining the vacuum state formed around the gradient magnetic field generating means. The shape and the like are not particularly limited as long as they can be brought into a state.
【００４２】[0042]
【発明の効果】以上詳細に説明したように、本発明によ
れば、傾斜磁場発生手段の周囲を真空状態にし、傾斜磁
場発生手段と静磁場発生手段の間に第１の防振ゴムを設
け、また、静磁場発生手段と隔壁の間に第２の防振ゴム
を設けることにより、２重または３重に固定伝搬を遮断
でき、簡単な構成で空気伝搬だけでなく効果的に固定伝
搬を抑制し、静音型の傾斜磁場ユニットおよび磁気共鳴
イメージング装置を提供することができる。As described above in detail, according to the present invention, the surroundings of the gradient magnetic field generating means are evacuated, and the first rubber is provided between the gradient magnetic field generating means and the static magnetic field generating means. In addition, by providing the second vibration isolating rubber between the static magnetic field generating means and the partition wall, fixed propagation can be cut off two or three times, and not only air propagation but also fixed propagation can be effectively achieved with a simple configuration. Thus, it is possible to provide a silent type gradient magnetic field unit and a magnetic resonance imaging apparatus.
【図１】（ａ）本発明に係る第１の実施の形態における
磁気共鳴イメージング装置の一部切欠正面図である。 （ｂ）本発明に係る第１の実施の形態における磁気共鳴
イメージング装置の断面図である。FIG. 1A is a partially cutaway front view of a magnetic resonance imaging apparatus according to a first embodiment of the present invention. FIG. 1B is a cross-sectional view of the magnetic resonance imaging apparatus according to the first embodiment of the present invention.
【図２】本発明に係る第１の実施の形態における磁石イ
ンターフェースと真空蓋の接続部の拡大図である。FIG. 2 is an enlarged view of a connection portion between a magnet interface and a vacuum lid according to the first embodiment of the present invention.
【図３】本発明に係る第１の実施の形態における真空蓋
と内筒の接続部の拡大図である。FIG. 3 is an enlarged view of a connection portion between a vacuum lid and an inner cylinder according to the first embodiment of the present invention.
【図４】本発明に係る第１の実施の形態の第１の変形例
における磁石インターフェースと真空蓋の接続部の拡大
図である。FIG. 4 is an enlarged view of a connection portion between a magnet interface and a vacuum lid in a first modification of the first embodiment according to the present invention.
【図５】本発明に係る第１の実施の形態の第２の変形例
における磁石インターフェースと真空蓋の接続部の拡大
図である。FIG. 5 is an enlarged view of a connection portion between a magnet interface and a vacuum lid in a second modification of the first embodiment according to the present invention.
【図６】本発明に係る第１の実施の形態の第３の変形例
における真空蓋と内筒の接続部の拡大図である。FIG. 6 is an enlarged view of a connection portion between a vacuum lid and an inner cylinder in a third modification of the first embodiment according to the present invention.
【図７】本発明に係る第１の実施の形態の第４の変形例
における磁気共鳴イメージング装置の断面図である。FIG. 7 is a sectional view of a magnetic resonance imaging apparatus according to a fourth modification of the first embodiment of the present invention.
１ 真空容器 ２ 傾斜磁場コイル ３ 真空蓋 ４ 内筒 ５ 支持ブラケット ６ 防振ゴム ７ 磁石インターフェース ８ 被検体 ９ 天板 １０ 防振ゴム １１ 防振ゴム １１ａ 凸部 １１ｂ フランジ １２ 防振ゴム １２ａ 凸部 １４ 防振ゴム １５ ブラケット １６ 防振ゴム １７ 真空ホース １８ 真空ポンプ １９ ガントリ ２０ ボルト ２１ ワッシャー ２２ ボルト ２３ ワッシャー ２４ 防振ゴム ２４ａ 凸部 ２５ 防振ゴム ２６ 防振ゴム ２７ 脚体 Ｆ 床 Ｓ 撮影空間 DESCRIPTION OF SYMBOLS 1 Vacuum container 2 Gradient magnetic field coil 3 Vacuum lid 4 Inner cylinder 5 Support bracket 6 Anti-vibration rubber 7 Magnet interface 8 Subject 9 Top plate 10 Anti-vibration rubber 11 Anti-vibration rubber 11a Convex part 11b Flange 12 Anti-vibration rubber 12a Convex part 14 Anti-vibration rubber 15 Bracket 16 Anti-vibration rubber 17 Vacuum hose 18 Vacuum pump 19 Gantry 20 Bolt 21 Washer 22 Bolt 23 Washer 24 Anti-vibration rubber 24a Convex part 25 Anti-vibration rubber 26 Anti-vibration rubber 27 Leg F Floor S Shooting space
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高森 博光 栃木県大田原市下石上1385番地 株式会社 東芝那須工場内 (72)発明者 魚崎 泰弘 栃木県大田原市下石上1385番地 株式会社 東芝那須工場内 Ｆターム(参考） 4C096 AB47 CA15 CA67 CA70 CB19 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiromitsu Takamori 1385 Shimoishigami, Otawara City, Tochigi Prefecture, Toshiba Nasu Factory Co., Ltd. (72) Inventor Yasuhiro Uozaki 1385 Shimoishigami, Otawara City, Tochigi Prefecture F, Toshiba Nasu Factory Co., Ltd. Term (reference) 4C096 AB47 CA15 CA67 CA70 CB19
Claims (24)
場発生手段と、前記撮影空間に傾斜磁場を生成するため
の傾斜磁場発生手段と、前記傾斜磁場発生手段の周囲に
形成された真空状態を保持するための密閉手段と、前記
撮影空間を確保するための隔壁と、前記静磁場発生手段
と前記傾斜磁場発生手段の間に介在して振動の伝搬を抑
制するための第１の防振部材と、前記静磁場発生手段と
前記隔壁の間に介在して振動の伝搬を抑制するための第
２の防振部材と、を具備することを特徴とする磁気共鳴
イメージング装置。1. A static magnetic field generating means for generating a static magnetic field in an imaging space, a gradient magnetic field generating means for generating a gradient magnetic field in the imaging space, and a vacuum formed around the gradient magnetic field generating means A sealing means for maintaining a state, a partition for securing the photographing space, and a first barrier for suppressing propagation of vibration by being interposed between the static magnetic field generating means and the gradient magnetic field generating means. A magnetic resonance imaging apparatus comprising: a vibration member; and a second vibration isolation member interposed between the static magnetic field generating means and the partition to suppress propagation of vibration.
手段の下部空間にあり且つ前記撮影空間に挿入される被
検体の挿入方向の両端それぞれの位置に配置されたこと
を特徴とする請求項１記載の磁気共鳴イメージング装
置。2. The apparatus according to claim 1, wherein the first vibration isolating member is located in a space below the gradient magnetic field generating means and at both ends of the subject to be inserted into the imaging space in the insertion direction. The magnetic resonance imaging apparatus according to claim 1.
前記隔壁の間の空間を密閉し且つ前記隔壁を支持するた
めの密閉支持部材を有することを特徴とする請求項１ま
たは２記載の磁気共鳴イメージング装置。3. The sealing means according to claim 1, wherein said sealing means has a sealing support member for sealing a space between said static magnetic field generating means and said partition and supporting said partition. Magnetic resonance imaging device.
手段と前記密閉支持部材の間および前記密閉支持部材と
前記隔壁の間の少なくともどちらか一方に配置されたこ
とを特徴とする請求項３記載の磁気共鳴イメージング装
置。4. The apparatus according to claim 1, wherein the second vibration isolating member is disposed between the static magnetic field generating means and the hermetic support member and / or between the hermetic support member and the partition wall. The magnetic resonance imaging apparatus according to claim 3.
真空状態を保持する密閉機能を有することを特徴とする
請求項４記載の磁気共鳴イメージング装置。5. The magnetic resonance imaging apparatus according to claim 4, wherein the second vibration isolation member has a sealing function of maintaining a vacuum state in the vacuum space.
る位置に凸部を有することにより、密閉機能を備えたこ
とを特徴とする請求項４記載の磁気共鳴イメージング装
置。6. The magnetic resonance imaging apparatus according to claim 4, wherein the second vibration isolation member has a sealing function by having convex portions at positions facing each other.
された第２の防振部材は、前記隔壁の下部に配置され前
記隔壁の重量を支えるための支持用防振部材と前記真空
空間を密閉するために前記隔壁の周囲に配置された密閉
用防振部材とからなることを特徴とする請求項４乃至６
いずれか１項記載の磁気共鳴イメージング装置。7. A second vibration isolating member disposed between the hermetic support member and the partition wall, the supporting vibration isolating member disposed below the partition wall for supporting the weight of the partition wall, and the vacuum space. And a vibration isolating member for sealing disposed around the partition wall for sealing the partition wall.
The magnetic resonance imaging apparatus according to claim 1.
の間に配置された第２の防振部材は、前記密閉支持部材
の下部に配置され前記密閉支持部材の重量を支えるため
の支持用防振部材と前記真空空間を密閉するために前記
密閉支持部材の周囲に配置された密閉用防振部材とから
なることを特徴とする請求項４乃至６いずれか１項記載
の磁気共鳴イメージング装置。8. A second vibration isolator disposed between the hermetic support member and the static magnetic field generating means is provided below the hermetic support member for supporting the weight of the hermetic support member. The magnetic resonance imaging apparatus according to any one of claims 4 to 6, further comprising a vibration isolating member and a sealing vibration isolating member disposed around the sealing support member to seal the vacuum space. .
の圧力差を用いて固着され、前記真空空間の真空状態を
保持する密閉機能を有することを特徴とする請求項４記
載の磁気共鳴イメージング装置。9. The system according to claim 4, wherein the second vibration isolator is fixed using a pressure difference between an outside air pressure and a vacuum pressure, and has a sealing function of maintaining a vacuum state of the vacuum space. Magnetic resonance imaging equipment.
在する第２の防振部材が、断面が略Ｌ字型部分を含む形
状であり、前記略Ｌ字型部分を前記密閉支持部材と前記
隔壁で挟むことにより、外気圧と真空圧の圧力差を用い
て、前記密閉支持部材と前記隔壁を接続保持する接続保
持機能を有することを特徴とする請求項４乃至６いずれ
か１項記載の磁気共鳴イメージング装置。10. A second vibration isolation member interposed between the hermetic support member and the partition wall has a cross section including a substantially L-shaped portion, and the second L-shaped portion is formed in a shape including the substantially L-shaped portion. 7. A connection holding function for connecting and holding the sealing support member and the partition by using a pressure difference between an outside air pressure and a vacuum pressure by being sandwiched by the partition. Magnetic resonance imaging equipment.
の防振部材のうち少なくとも１つの防振部材がゴム系の
材料からなることを特徴とする請求項１乃至１０いずれ
か１項記載の磁気共鳴イメージング装置。11. The first vibration isolation member or the second vibration isolation member.
11. The magnetic resonance imaging apparatus according to claim 1, wherein at least one of the vibration isolating members is made of a rubber-based material.
取り囲む略環状部材であり、前記略環状部材の上部は下
部よりも前記撮影空間側に入りこんだ形状を有すること
を特徴とする請求項３乃至１１いずれか１項記載の磁気
共鳴イメージング装置。12. The device according to claim 3, wherein the sealing support member is a substantially annular member surrounding the photographing space, and an upper portion of the substantially annular member has a shape penetrating the photographing space side from a lower portion. 12. The magnetic resonance imaging apparatus according to any one of claims 11 to 11.
傾斜磁場発生手段と、前記傾斜磁場発生手段の周囲に形
成された真空状態を保持するための密閉手段と、前記撮
影空間を確保するための隔壁と、前記撮影空間に静磁場
を生成するための静磁場発生手段と前記傾斜磁場発生手
段の間に介在して振動の伝搬を抑制するための第１の防
振部材と、前記静磁場発生手段と前記隔壁の間に介在し
て振動の伝搬を抑制するための第２の防振部材と、を具
備することを特徴とする傾斜磁場ユニット。13. A gradient magnetic field generating means for generating a gradient magnetic field in an imaging space, a sealing means for maintaining a vacuum state formed around the gradient magnetic field generating means, and for securing the imaging space. A first vibration damping member interposed between a static magnetic field generating means for generating a static magnetic field in the imaging space and the gradient magnetic field generating means for suppressing propagation of vibration; A gradient magnetic field unit comprising: a second vibration isolation member interposed between a generation unit and the partition to suppress propagation of vibration.
生手段の下部空間にあり且つ前記撮影空間に挿入される
被検体の挿入方向の両端それぞれの位置に配置されたこ
とを特徴とする請求項１３記載の傾斜磁場ユニット。14. The apparatus according to claim 1, wherein the first vibration isolating member is located in a space below the gradient magnetic field generating means and at each of both ends in an insertion direction of a subject to be inserted into the imaging space. The gradient magnetic field unit according to claim 13.
と前記隔壁の間の空間を密閉し且つ前記隔壁を支持する
ための密閉支持部材を有することを特徴とする請求項１
３または１４記載の傾斜磁場ユニット。15. The sealing device according to claim 1, wherein the sealing means has a sealing support member for sealing a space between the static magnetic field generating means and the partition and supporting the partition.
15. The gradient magnetic field unit according to 3 or 14.
生手段と前記密閉支持部材の間および前記密閉支持部材
と前記隔壁の間の少なくともどちらか一方に配置された
ことを特徴とする請求項１５記載の傾斜磁場ユニット。16. The apparatus according to claim 16, wherein the second vibration isolating member is disposed between the static magnetic field generating means and the hermetic support member and / or between the hermetic support member and the partition wall. The gradient magnetic field unit according to claim 15.
の真空状態を保持する密閉機能を有することを特徴とす
る請求項１６記載の傾斜磁場ユニット。17. The gradient magnetic field unit according to claim 16, wherein the second vibration isolation member has a sealing function of maintaining a vacuum state of the vacuum space.
する位置に凸部を有することにより、密閉機能を備えた
ことを特徴とする請求項１６記載の傾斜磁場ユニット。18. The gradient magnetic field unit according to claim 16, wherein the second vibration isolator has a sealing function by having convex portions at positions facing each other.
置された第２の防振部材は、前記隔壁の下部に配置され
前記隔壁の重量を支えるための支持用防振部材と前記真
空空間を密閉するために前記隔壁の周囲に配置された密
閉用防振部材とからなることを特徴とする請求項１６乃
至１８いずれか１項記載の傾斜磁場ユニット。19. A second vibration isolator disposed between the hermetic support member and the partition wall, wherein the second vibration isolator member is disposed below the partition wall to support the weight of the partition wall, and the vacuum space. The gradient magnetic field unit according to any one of claims 16 to 18, further comprising a sealing vibration isolating member disposed around the partition wall to seal the partition.
の間に配置された第２の防振部材は、前記密閉支持部材
の下部に配置され前記密閉支持部材の重量を支えるため
の支持用防振部材と前記真空空間を密閉するために前記
密閉支持部材の周囲に配置された密閉用防振部材とから
なることを特徴とする請求項１６乃至１８いずれか１項
記載の傾斜磁場ユニット。20. A second vibration damping member disposed between the hermetic support member and the static magnetic field generating means is provided at a lower portion of the hermetic support member for supporting the weight of the hermetic support member. 19. The gradient magnetic field unit according to claim 16, comprising a vibration isolating member and a sealing vibration isolating member arranged around the sealing support member to seal the vacuum space.
圧の圧力差を用いて固着され、前記真空空間の真空状態
を保持する密閉機能を有することを特徴とする請求項１
６記載の傾斜磁場ユニット。21. The apparatus according to claim 1, wherein the second vibration isolating member is fixed using a pressure difference between an outside air pressure and a vacuum pressure, and has a sealing function of maintaining a vacuum state of the vacuum space.
7. The gradient magnetic field unit according to 6.
在する第２の防振部材が、断面が略Ｌ字型部分を含む形
状であり、前記略Ｌ字型部分を前記密閉支持部材と前記
隔壁で挟むことにより、外気圧と真空圧の圧力差を用い
て、前記密閉支持部材と前記隔壁を接続保持する接続保
持機能を有することを特徴とする請求項１６乃至１８い
ずれか１項記載の傾斜磁場ユニット。22. A second vibration damping member interposed between the hermetic support member and the partition wall has a cross section including a substantially L-shaped portion, and the substantially L-shaped portion is formed with the hermetic support member. 19. A connection holding function for connecting and holding the sealing support member and the partition by using a pressure difference between an outside air pressure and a vacuum pressure by being sandwiched by the partition. Gradient magnetic field unit.
の防振部材のうち少なくとも１つの防振部材がゴム系の
材料からなることを特徴とする請求項１３乃至２２いず
れか１項記載の傾斜磁場ユニット。23. The first vibration isolation member or the second vibration isolation member.
23. The gradient magnetic field unit according to claim 13, wherein at least one of the vibration isolating members is made of a rubber-based material.
取り囲む略環状部材であり、前記略環状部材の上部は下
部よりも前記撮影空間側に入りこんだ形状を有すること
を特徴とする請求項１５乃至２３いずれか１項記載の傾
斜磁場ユニット。24. The sealing support member is a substantially annular member that surrounds the photographing space, and an upper portion of the substantially annular member has a shape penetrating the photographing space side from a lower portion. 24. The gradient magnetic field unit according to any one of claims 23 to 23.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000076019A JP3367932B2 (en) | 2000-03-17 | 2000-03-17 | Gradient magnetic field unit and magnetic resonance imaging apparatus |
| US09/764,214 US6954068B1 (en) | 2000-01-21 | 2001-01-19 | Magnetic resonance imaging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000076019A JP3367932B2 (en) | 2000-03-17 | 2000-03-17 | Gradient magnetic field unit and magnetic resonance imaging apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001258864A true JP2001258864A (en) | 2001-09-25 |
| JP3367932B2 JP3367932B2 (en) | 2003-01-20 |
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ID=18593821
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000076019A Expired - Fee Related JP3367932B2 (en) | 2000-01-21 | 2000-03-17 | Gradient magnetic field unit and magnetic resonance imaging apparatus |
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| Country | Link |
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| JP (1) | JP3367932B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009031092A1 (en) * | 2007-09-07 | 2009-03-12 | Koninklijke Philips Electronics N.V. | Magnetic resonance examination system with reduced acoustic noise |
| JP2009061267A (en) * | 2007-08-09 | 2009-03-26 | Toshiba Corp | Magnetic resonance imaging apparatus |
| JP2009090101A (en) * | 2007-09-21 | 2009-04-30 | Toshiba Corp | Magnetic resonance apparatus gantry and magnetic resonance apparatus |
| JP2011078501A (en) * | 2009-10-05 | 2011-04-21 | Toshiba Corp | Magnetic resonance diagnostic apparatus |
| KR101426274B1 (en) * | 2012-11-06 | 2014-08-05 | 삼성전자주식회사 | Gradient coil mounting unit and Magnetic resonance imaging apparatus employing the same |
-
2000
- 2000-03-17 JP JP2000076019A patent/JP3367932B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009061267A (en) * | 2007-08-09 | 2009-03-26 | Toshiba Corp | Magnetic resonance imaging apparatus |
| WO2009031092A1 (en) * | 2007-09-07 | 2009-03-12 | Koninklijke Philips Electronics N.V. | Magnetic resonance examination system with reduced acoustic noise |
| JP2009090101A (en) * | 2007-09-21 | 2009-04-30 | Toshiba Corp | Magnetic resonance apparatus gantry and magnetic resonance apparatus |
| JP2011078501A (en) * | 2009-10-05 | 2011-04-21 | Toshiba Corp | Magnetic resonance diagnostic apparatus |
| KR101426274B1 (en) * | 2012-11-06 | 2014-08-05 | 삼성전자주식회사 | Gradient coil mounting unit and Magnetic resonance imaging apparatus employing the same |
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| Publication number | Publication date |
|---|---|
| JP3367932B2 (en) | 2003-01-20 |
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