JP3746329B2 - Magnetic resonance imaging system - Google Patents

Magnetic resonance imaging system Download PDF

Info

Publication number
JP3746329B2
JP3746329B2 JP14488996A JP14488996A JP3746329B2 JP 3746329 B2 JP3746329 B2 JP 3746329B2 JP 14488996 A JP14488996 A JP 14488996A JP 14488996 A JP14488996 A JP 14488996A JP 3746329 B2 JP3746329 B2 JP 3746329B2
Authority
JP
Japan
Prior art keywords
gantry
top plate
subject
resonance imaging
magnetic resonance
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.)
Expired - Fee Related
Application number
JP14488996A
Other languages
Japanese (ja)
Other versions
JPH09299352A (en
Inventor
靖宏 小林
仁志 吉野
和明 井上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Healthcare Manufacturing Ltd
Original Assignee
Hitachi Medical Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Medical Corp filed Critical Hitachi Medical Corp
Priority to JP14488996A priority Critical patent/JP3746329B2/en
Publication of JPH09299352A publication Critical patent/JPH09299352A/en
Application granted granted Critical
Publication of JP3746329B2 publication Critical patent/JP3746329B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Magnetic Resonance Imaging Apparatus (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、天板をガントリ内に送り込む際に、被検体の所望の撮影部位を磁場中心に容易かつ正確に移動させ位置合わせ可能な磁気共鳴イメージング装置(以下、MRI装置という)に関するものである。
【0002】
【従来の技術】
MRI装置は、そのガントリ部分に、静磁場発生装置、傾斜磁場発生装置、高周波照射装置(RF照射装置)、高周波送受信コイル(高周波(RF)コイル)を備えて構成されている。
図6,図7は上記ガントリ部分を示す図で、その静磁場発生装置は、これら図6,図7に示すように、被検体(図示せず)を挿入する測定空間50を介して対向させた円盤状の磁極片51a,51bを備え、その裏面側に極性の異なる一対の永久磁石52a,52bを磁極片51a,51bと各別に密着状態で配置し、それら永久磁石52a,52bを保持固定する一対の継鉄板53a,53bを備え、更にそれら継鉄板53a,53b相互を連結し、継鉄板53a,53b相互間を一定距離に保持するための2本の継鉄棒54a,54bを備えてなる。この場合、2本の継鉄棒54a,54bはガントリ13の後面側に位置されているため、それら継鉄棒54a,54bに阻まれることなく被検体の測定空間50への送込み,後退を行う開口部110をガントリ13の前面側に大きく設定することができている。
傾斜磁場発生装置(図示せず)及びRF照射装置55a,55bは、フラット型になっており、これらによっても開口部110が塞がれることはなく、測定空間50側にあるRF照射装置55a,55bの相互間距離が開口高さ(測定空間50の高さ寸法)となっている。
【0003】
また、図8,図9に示すように、ガントリ13内の磁場中心へ被検体を送り込むための患者テーブル71は、被検体体軸方向(縦方向)72の移動である縦移動と、ガントリ13外における体軸方向72に直交する方向(横方向)73の移動である横移動及び上下方向74の移動である上下動との天板移動機能を持つ。この場合、縦移動では被検体を横たえた天板75のみがガントリ13内へ送り込まれ、横移動及び上下動は天板支持部76ごと移動する。
被検体は原則的に上下動下限にあるとき天板75上に載せられ、天板75裏面のローラ(図示せず)がガントリ開口部110下側のRF照射装置55aに丁度接する高さまで上昇させた後、縦移動によりガントリ13内へ天板75と共に送り込まれる。このとき、天板75裏側の上記ローラが下側のRF照射装置55aに載ることでガントリ13内での天板75の支持がなされるため、ガントリ13内での天板75は縦移動(送込み,後退)のみ可能であり、横移動はできない。
【0004】
このため、ガントリ13内で横移動の必要性が生じた場合は、一度ガントリ13外へ天板75を後退し、横移動させた後、再び縦移動によりガントリ13内へ送り込む必要がある。再度の送込みを行った後の状態を図10に示す。
また、患者テーブル71の配置は、図8〜図10に示すようにガントリ13横方向(幅方向)の中心に合わせて位置決め固定され、一方向からしかガントリ13へ天板75を送り込めないため、磁場中心へ被検体を送り込むための位置決めも縦横方向(2軸)のみの選択しかない。
更に、撮影が終了し、ガントリ13内から被検体を後退する場合は、その位置が縦方向の限界位置であっても再び元の位置(被検体を載せた位置)まで後退させる必要がある。
【0005】
【発明が解決しようとする課題】
上記従来技術は、被検体の撮影部位を磁場中心に位置させ、均一度の最も良好な場所で撮影することについて十分な考慮がされていなかった。磁場均一度の最も良好な場所で撮影することは、磁場不均一による画像の折返しや歪み、S/Nの劣化等を生じない良好な画像を得ることができるという大きな利点がある。
しかし、上述したように、患者テーブル71の配置は、図8〜図10に示すようにガントリ13横方向(幅方向)の中心に合わせて位置決め固定され、一方向からしかガントリ13へ天板75を送り込めないため、磁場中心へ被検体を送り込むための位置決めも縦横方向(2軸)のみの選択しかない。このため、撮影部位によっては磁場中心への送込みや位置決めが容易でない場合が生じる。また、ガントリ13内での横移動ができないため、測定空間50内で、ある撮影部位の撮影終了直後に別の撮影部位を測定空間50内の磁場中心へ移動させたいときでも一度ガントリ13外へ天板75を後退し、横移動させた後、再び縦移動によりガントリ13内へ送り込む必要がある。
これにより、操作が煩雑となり、スループットが低下して撮影効率が下がることになる。このため、磁場中心への送込みや位置合わせが正確になされず、得られる画像の画質が低下することがある。また、撮影技師が煩わしさを感じ、天板75を横移動させずに被検体を天板75上で移動させることで対処しようとした場合は、健常でない被検体に多大な負担を掛けることにもなる等、種々の問題点があった。
【0006】
請求項1の発明の目的は、撮影効率の向上、画質の向上及び被検体の負担軽減が図れ、また撮影技師の煩わしさを解消することができるMRI装置を提供することにある。
【0008】
【課題を解決するための手段】
本発明の目的は、静磁場発生手段を有して前面に開口部が開かれたガントリと、被検体を横たえた天板を前記開口部内に送り込みあるいはその送込み位置から前記開口部外に後退させる天板移動手段を有する患者テーブルとを備えてなる磁気共鳴イメージング装置において、前記静磁場の方向は、前記被検体の体軸に対して垂直な方向であり、前記患者テーブルは、前記ガントリと連結された状態で、前記前面開口部の範囲内で該開口部の外周に沿ってスイング移動可能なスイング移動手段と、前記ガントリの下部に備えられた前記患者テーブルのスイング移動を駆動する駆動手段と、を備え、前記スイングは、前記天板を前記前面開口部における複数の方向から前記開口部内へ送り込め、かつ、その送込み方向がガントリ内の磁場中心に向かうようにされることにより達成される。上記のようなスイング移動手段を設ければ、被検体の色々な撮影部位に対しても容易に位置決めを行いガントリ内の磁場中心へ送り込むことができて上記撮影部位を上記磁場中心へ容易に位置合わせでき、撮影効率の向上、画質の向上及び被検体の負担軽減が図れ、撮影技師の煩わしさの解消が各々実現される。
【0009】
また、本発明の目的は、静磁場及び傾斜磁場の各磁場発生手段を備え、前面に大きく開口部が開かれたガントリと、被検体に電磁波を照射しあるいは被検体からの磁気共鳴信号を検出する高周波コイルと、この高周波コイルで検出された信号に基づき前記被検体の物理的性質を表わす画像を得る画像再構成手段と、前記被検体を横たえた天板を前記開口部内に送り込みあるいはその送込み位置から前記開口部外に後退させる被検体体軸方向の縦移動、この縦移動の方向と直交する水平方向の横移動及び前記開口部外における前記天板の上下動を各々させる天板移動手段を持つ患者テーブルとを備えてなる磁気共鳴イメージング装置において、前記患者テーブルをガントリの左右両側に一対配置し、被検体を横たえた両テーブルに共通の天板がそれらテーブル相互間を、ガントリ内の磁場中心をその通過点として移動可能でかつ被検体を横たえた天板が前記磁場中心に位置するときにその天板を横移動可能に支持する天板横移動自在支持手段を設けることにより達成される。上記のように患者テーブルをガントリの左右両側に一対配置し、また天板横移動自在支持手段を設ければ、被検体の色々な撮影部位に対しても容易に位置決めを行いガントリ内の磁場中心へ移動することができて上記撮影部位を上記磁場中心へ容易に位置合わせでき、撮影効率の向上、画質の向上及び被検体の負担軽減が図れ、撮影技師の煩わしさの解消が各々実現され、また、ガントリの左右いずれの側からも患者テーブルに対する被検体の載せ,降ろしが可能となって更に撮影効率が向上する。
【0010】
【発明の実施の形態】
以下、図面を参照して本発明の実施形態を説明する。図1〜図4は、請求項1の発明によるMRI装置の一実施形態を説明するための図で、図1は斜視図、図2は要部を取り出し底面側から示す平面図、図3は同じく要部を取り出し底面側から示す斜視図、図4は患者テーブル部分の内部の側面図である。図1〜図4において、図6〜図10と同一符号は同一又は相当部分を示す。また、図1〜図4において同一符号は同一部分を示す。請求項1のMRI装置は、患者テーブル71を、被検体(図示せず)を横たえた天板75をガントリ13の開口部110内へその開口部110の複数の角度(方向)からも送り込め、かつその縦移動送込み方向が常にガントリ13内の磁場中心に向かうようスイング移動可能なスイング移動手段を設けて構成したものである。
【0011】
すなわち図1に示すように、患者テーブル71は患者テーブル支持台10上に配置され、この支持台10の動きに合わせて移動可能である。そして、この支持台10の下部にはローラ11が取り付けられ、縦移動送込み方向が常にガントリ13内の磁場中心に向かうよう磁場中心を中心とする円の円周方向12に移動(スイング移動)可能である。
ここで、上記スイング移動について説明すると、図2,図3に示すように、上記ローラ11は、スイング移動が円滑に行われるようにスイング移動軌跡12´に合わせた角度をもって支持台10に取り付けられ、また支持台10は、ガントリ13の下部に取り付けられた回転軸23に軸止された中間連結部材22と連結されている。この場合、中間連結部材22は、油圧シリンダ21からの駆動力を伝える伝達部材24と連結されている。すなわち、油圧シリンダ21がその駆動方向25に進退することにより、伝達部材24を介して中間連結部材22を、回転軸O1を中心に回動させ、患者テーブル支持台10がスイング移動するようになされている。
なお図4に示すように、上記油圧シリンダ21を駆動させるための油圧駆動ユニット31が患者テーブル71内部に配置されており、油圧伝達経路32を介してその駆動力が油圧シリンダ21に伝達され、油圧シリンダ21の動作が制御されるように構成されている。
【0012】
請求項1のMRI装置は、上記のようにスイング移動手段を設けたので、被検体の色々な撮影部位に対しても容易に位置決めを行いガントリ13内の磁場中心へ送り込むことができて上記撮影部位を上記磁場中心へ容易に位置合わせでき、撮影効率の向上、画質の向上及び被検体の負担軽減が図れ、撮影技師の煩わしさの解消が各々実現できる。
【0013】
図5は、発明MRI装置の一実施形態を示す斜視図である。この図5において、図1〜図4と同一符号は同一又は相当部分を示す。72a,72bは被検体体軸方向(天板縦方向)、73a,73bは天板横方向、74a,74bは天板上下方向を示す。すなわち図5に示すMRI装置は、患者テーブル71をガントリ13の左右両側に一対(71a,71b)配置し、被検体を横たえた両テーブル71a,71bに共通の天板75がそれらテーブル71a,71b相互間を、ガントリ13内の磁場中心をその通過点として移動可能で、また被検体を横たえた天板75が上記磁場中心に位置するときにその天板75を横移動可能に支持する天板横移動自在支持手段を設けたものである。天板横移動自在支持手段としては、被検体を横たえた天板75がガントリ13内の磁場中心に位置するときに、天板75の横方向73a,73bへの移動(横移動)を同時に行う天板支持部76a,76bを持っている。被検体を載せるための天板75は、左右どちらの患者テーブル71a,71bからもガントリ13内へ送り込むことができ、またこの天板75が両方の患者テーブル71a,71b上に載っている場合は、開口部110下側のRF照射装置55a上面でその天板75を支える必要がなく、左右の患者テーブル71a,71bの天板支持部76a,76bで支えるようになされている。この時、開口部110下側のRF照射装置55a上面に触れないように、左右の患者テーブル71a,71bの天板支持部76a,76bがやや上昇されるようになされている。
【0014】
【発明の効果】
発明によれば、スイング移動手段を設けたので、被検体の色々な撮影部位をガントリ内の磁場中心へ容易に位置合わせでき、撮影効率の向上、画質の向上及び被検体の負担軽減が図れ、また撮影技師の煩わしさを解消することができるという効果がある。また、本発明によれば、患者テーブルをガントリの左右両側に一対配置し、また天板横移動自在支持手段を設けたので、被検体の色々な撮影部位をガントリ内の磁場中心へ容易に位置合わせでき、撮影効率の向上、画質の向上及び被検体の負担軽減が図れ、また撮影技師の煩わしさを解消することができるという効果がある。また、ガントリの左右いずれの側からも患者テーブルに対する被検体の載せ,降ろしが可能で、さらなる撮影効率の向上が図れるという効果もある。
【図面の簡単な説明】
【図1】発明によるMRI装置の一実施形態を示す斜視図である。
【図2】同上装置の要部を取り出し底面側から示す平面図である。
【図3】同じく要部を取り出し底面側から示す斜視図である。
【図4】図1に示すMRI装置の患者テーブル部分の内部の側面図である。
【図5】発明によるMRI装置の一実施形態を示す斜視図である。
【図6】MRI装置のガントリ部分の斜視図である。
【図7】MRI装置のガントリ部分の一部切断正面図である。
【図8】従来のMRI装置の斜視図である。
【図9】従来のMRI装置の斜視図である。
【図10】従来のMRI装置の斜視図である。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic resonance imaging apparatus (hereinafter referred to as an MRI apparatus) that can easily and accurately move a desired imaging region of a subject to a magnetic field center when the top plate is fed into a gantry. .
[0002]
[Prior art]
The MRI apparatus includes a gantry portion including a static magnetic field generation device, a gradient magnetic field generation device, a high frequency irradiation device (RF irradiation device), and a high frequency transmission / reception coil (high frequency (RF) coil).
6 and 7 are diagrams showing the gantry portion, and the static magnetic field generator is opposed to each other through a measurement space 50 into which a subject (not shown) is inserted as shown in FIGS. Disk-shaped magnetic pole pieces 51a and 51b, and a pair of permanent magnets 52a and 52b having different polarities are arranged in close contact with the magnetic pole pieces 51a and 51b on the back side thereof, and these permanent magnets 52a and 52b are held and fixed. A pair of yoke plates 53a and 53b, and two yoke rods 54a and 54b for connecting the yoke plates 53a and 53b to each other and holding the yoke plates 53a and 53b at a fixed distance. . In this case, since the two yoke rods 54a and 54b are located on the rear surface side of the gantry 13, the openings for feeding and retracting the subject to and from the measurement space 50 without being obstructed by the yoke rods 54a and 54b. The portion 110 can be set large on the front side of the gantry 13.
The gradient magnetic field generator (not shown) and the RF irradiation devices 55a and 55b are flat, and the opening 110 is not blocked by these, and the RF irradiation devices 55a and 55a on the measurement space 50 side are also closed. The mutual distance 55b is the opening height (height dimension of the measurement space 50).
[0003]
As shown in FIGS. 8 and 9, the patient table 71 for sending the subject to the center of the magnetic field in the gantry 13 has a vertical movement which is a movement in the subject body axis direction (vertical direction) 72, and the gantry 13. It has a top plate moving function of lateral movement which is movement in a direction (lateral direction) 73 orthogonal to the body axis direction 72 outside and vertical movement which is movement in the vertical direction 74. In this case, in the vertical movement, only the top plate 75 that lays the subject is sent into the gantry 13, and the horizontal movement and the vertical movement move together with the top plate support portion 76.
In principle, the subject is placed on the top plate 75 when it is at the lower limit of the vertical movement, and the roller (not shown) on the back surface of the top plate 75 is raised to a height just touching the RF irradiation device 55a below the gantry opening 110. Then, it is fed into the gantry 13 together with the top board 75 by vertical movement. At this time, since the roller on the back side of the top plate 75 is placed on the lower RF irradiation device 55a, the top plate 75 is supported in the gantry 13, so that the top plate 75 in the gantry 13 moves vertically (feeds). Can only move inward and backward), not laterally.
[0004]
For this reason, when the necessity of lateral movement in the gantry 13 arises, it is necessary to once retract the top plate 75 to the outside of the gantry 13, move it laterally, and then feed it back into the gantry 13 by vertical movement. FIG. 10 shows a state after the re-feeding.
Further, as shown in FIGS. 8 to 10, the patient table 71 is positioned and fixed in alignment with the center of the gantry 13 in the lateral direction (width direction), and the top plate 75 can be sent to the gantry 13 from only one direction. The positioning for sending the subject to the center of the magnetic field can only be selected in the vertical and horizontal directions (two axes).
Furthermore, when the imaging is completed and the subject is retracted from the gantry 13, it is necessary to retract it back to the original position (position where the subject is placed) even if the position is the limit position in the vertical direction.
[0005]
[Problems to be solved by the invention]
In the above prior art, sufficient consideration has not been given to taking an image of a subject at the center of the magnetic field and taking an image at a place with the best uniformity. Shooting at a place where the magnetic field uniformity is the best has the great advantage that a good image can be obtained that does not cause aliasing or distortion of the image due to magnetic field inhomogeneity, S / N degradation, or the like.
However, as described above, the patient table 71 is positioned and fixed in accordance with the center of the lateral direction (width direction) of the gantry 13 as shown in FIGS. Therefore, positioning for sending the subject to the center of the magnetic field can only be selected in the vertical and horizontal directions (two axes). For this reason, depending on the imaging region, there are cases where it is not easy to feed or position the magnetic field center. Further, since lateral movement within the gantry 13 is not possible, even when it is desired to move another imaging region to the center of the magnetic field in the measurement space 50 immediately after the imaging of a certain imaging region is completed in the measurement space 50, it is once out of the gantry 13. After the top plate 75 is retracted and moved laterally, it is necessary to feed it back into the gantry 13 by vertical movement again.
This complicates the operation, lowers the throughput, and lowers the shooting efficiency. For this reason, feeding to the magnetic field center and alignment are not performed accurately, and the image quality of the obtained image may be deteriorated. In addition, if the radiographer feels bothersome and tries to deal with the subject by moving the subject on the top 75 without moving the top 75 sideways, it places a great burden on the unhealthy subject. There were various problems, such as
[0006]
An object of the invention of claim 1 is to provide an MRI apparatus that can improve imaging efficiency, improve image quality, reduce the burden on the subject, and eliminate the troublesomeness of the imaging engineer.
[0008]
[Means for Solving the Problems]
An object of the present invention is to feed a gantry having a static magnetic field generating means with an opening on the front surface and a top plate that lays the subject into the opening or retracts from the feeding position to the outside of the opening. And a patient table having a top table moving means for causing the static magnetic field to have a direction perpendicular to the body axis of the subject, and the patient table includes the gantry and the gantry. Swing means for swinging along the outer periphery of the opening within the range of the front opening in a connected state, and driving means for driving the swing movement of the patient table provided under the gantry When, wherein the swing, the Okurikome the top plate from a plurality of directions in the front opening to the aperture portion, and, towards the center of the magnetic field of the gantry direction infeed thereof It is accomplished by being in Migihitsuji. If the swing moving means as described above is provided, it is possible to easily position the various imaging parts of the subject and send them to the magnetic field center in the gantry, and easily position the imaging part to the magnetic field center. The imaging efficiency can be improved, the image quality can be improved, the burden on the subject can be reduced, and the troublesomeness of the imaging technician can be eliminated.
[0009]
Another object of the present invention is to provide a static magnetic field and a gradient magnetic field generating means, a gantry having a large opening on the front surface, and irradiating a subject with electromagnetic waves or detecting a magnetic resonance signal from the subject. A high-frequency coil, an image reconstruction unit that obtains an image representing the physical properties of the subject based on a signal detected by the high-frequency coil, and a top plate that lays the subject is sent into or sent to the opening. A vertical movement in the direction of the subject body axis that is retracted out of the opening from the insertion position, a horizontal movement perpendicular to the direction of the vertical movement, and a vertical movement of the top board outside the opening. In a magnetic resonance imaging apparatus comprising a patient table having means, a pair of the patient tables are arranged on the left and right sides of the gantry, and a common top plate is used for both tables lying on the subject. The table top that can move between these tables with the magnetic field center in the gantry as its passing point and supports the table so that the table can be moved laterally when the table is positioned at the magnetic field center. This is achieved by providing movable support means. As described above, a pair of patient tables are arranged on both the left and right sides of the gantry, and the top plate can be moved freely. The imaging part can be easily aligned with the magnetic field center, the imaging efficiency can be improved, the image quality can be improved, and the burden on the subject can be reduced. Further, the subject can be placed on and lowered from the patient table from either the left or right side of the gantry, and the imaging efficiency is further improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 are views for explaining an embodiment of the MRI apparatus according to the invention of claim 1, FIG. 1 is a perspective view, FIG. 2 is a plan view showing a main part taken out from the bottom side, and FIG. Similarly, a perspective view showing the main part taken out from the bottom surface side, and FIG. 4 is a side view of the inside of the patient table portion. 1 to 4, the same reference numerals as those in FIGS. 6 to 10 denote the same or corresponding parts. 1 to 4, the same reference numerals denote the same parts. In the MRI apparatus according to claim 1, the patient table 71 can be fed into the opening 110 of the gantry 13 from the plurality of angles (directions) of the opening 110 with the top plate 75 that lays the subject (not shown). In addition, there is provided a swing moving means capable of swing movement so that the longitudinal movement feeding direction is always directed toward the magnetic field center in the gantry 13.
[0011]
That is, as shown in FIG. 1, the patient table 71 is disposed on the patient table support base 10 and can be moved in accordance with the movement of the support base 10. A roller 11 is attached to the lower part of the support base 10 and moves in a circumferential direction 12 of a circle centered on the magnetic field center (swing movement) so that the longitudinal movement feeding direction is always directed to the magnetic field center in the gantry 13. Is possible.
Here, the swing movement will be described. As shown in FIGS. 2 and 3, the roller 11 is attached to the support base 10 at an angle according to the swing movement locus 12 ′ so that the swing movement can be performed smoothly. The support 10 is connected to an intermediate connecting member 22 fixed to a rotating shaft 23 attached to the lower part of the gantry 13. In this case, the intermediate connecting member 22 is connected to a transmission member 24 that transmits a driving force from the hydraulic cylinder 21. That is, when the hydraulic cylinder 21 moves back and forth in the driving direction 25, the intermediate coupling member 22 is rotated about the rotation axis O1 via the transmission member 24, and the patient table support 10 is swung. ing.
As shown in FIG. 4, a hydraulic drive unit 31 for driving the hydraulic cylinder 21 is disposed inside the patient table 71, and the driving force is transmitted to the hydraulic cylinder 21 via the hydraulic transmission path 32. The operation of the hydraulic cylinder 21 is configured to be controlled.
[0012]
Since the MRI apparatus according to the first aspect is provided with the swing moving means as described above, it is possible to easily position the various imaging parts of the subject and send them to the center of the magnetic field in the gantry 13 so that the imaging is performed. The site can be easily aligned with the center of the magnetic field, the imaging efficiency can be improved, the image quality can be improved, and the burden on the subject can be reduced, thereby eliminating the troublesomeness of the imaging technician.
[0013]
FIG. 5 is a perspective view showing an embodiment of the MRI apparatus of the present invention. 5, the same reference numerals as those in FIGS. 1 to 4 denote the same or corresponding parts. Reference numerals 72a and 72b denote subject body axis directions (top plate vertical direction), 73a and 73b denote top plate horizontal directions, and 74a and 74b denote top plate vertical directions. That is, in the MRI apparatus shown in FIG. 5, a pair of patient tables 71 (71a, 71b) are arranged on both left and right sides of the gantry 13, and a top plate 75 common to both tables 71a, 71b that lay the subject is provided on the tables 71a, 71b. A top plate that can move between the center of the magnetic field in the gantry 13 as a passing point and supports the top plate 75 so that the top plate 75 can be moved laterally when the top plate 75 that lies on the subject is positioned at the magnetic field center. A laterally movable support means is provided. As the top plate laterally movable support means, when the top plate 75 laying the subject is located at the center of the magnetic field in the gantry 13, the top plate 75 is moved in the lateral directions 73a and 73b (lateral movement) at the same time. It has top plate support portions 76a and 76b. The top plate 75 for placing the subject can be fed into the gantry 13 from either the left or right patient table 71a, 71b, and when the top plate 75 is placed on both the patient tables 71a, 71b. The top plate 75 does not need to be supported by the upper surface of the RF irradiation device 55a below the opening 110, and is supported by the top plate support portions 76a and 76b of the left and right patient tables 71a and 71b. At this time, the top plate support portions 76a and 76b of the left and right patient tables 71a and 71b are slightly raised so as not to touch the upper surface of the RF irradiation device 55a below the opening 110.
[0014]
【The invention's effect】
According to the present invention, since the swing moving means is provided, various imaging parts of the subject can be easily aligned with the center of the magnetic field in the gantry, thereby improving the imaging efficiency, improving the image quality, and reducing the burden on the subject. Also, there is an effect that the troublesomeness of the photographing engineer can be eliminated. In addition, according to the present invention, a pair of patient tables are arranged on both the left and right sides of the gantry, and the top plate laterally movable support means is provided, so that various imaging parts of the subject can be easily positioned at the magnetic field center in the gantry. The imaging efficiency can be improved, the image quality can be improved, the burden on the subject can be reduced, and the troublesomeness of the imaging technician can be eliminated. In addition, it is possible to load and unload the subject on the patient table from either the left or right side of the gantry, and there is an effect that the imaging efficiency can be further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an MRI apparatus according to the present invention.
FIG. 2 is a plan view showing a main part of the same apparatus taken out from the bottom surface side.
FIG. 3 is a perspective view showing the main part taken out from the bottom side.
4 is a side view of the inside of a patient table portion of the MRI apparatus shown in FIG. 1. FIG.
FIG. 5 is a perspective view showing an embodiment of an MRI apparatus according to the present invention.
FIG. 6 is a perspective view of a gantry portion of the MRI apparatus.
FIG. 7 is a partially cut front view of a gantry portion of the MRI apparatus.
FIG. 8 is a perspective view of a conventional MRI apparatus.
FIG. 9 is a perspective view of a conventional MRI apparatus.
FIG. 10 is a perspective view of a conventional MRI apparatus.

Claims (4)

静磁場発生手段を有して前面に開口部が開かれたガントリと、被検体を横たえた天板を前記開口部内に送り込みあるいはその送込み位置から前記開口部外に後退させる天板移動手段を有する患者テーブルとを備えてなる磁気共鳴イメージング装置において、
前記静磁場の方向は、前記被検体の体軸に対して垂直な方向であり、
前記患者テーブルは、前記ガントリと連結された状態で、前記前面開口部の範囲内で該開口部の外周に沿ってスイング移動可能なスイング移動手段と
前記ガントリの下部に備えられた前記患者テーブルのスイング移動を駆動する駆動手段と、を備え、
前記スイングは、前記天板を前記前面開口部における複数の方向から前記開口部内へ送り込め、かつ、その送込み方向がガントリ内の磁場中心に向かうようにされることを特徴とする磁気共鳴イメージング装置。
A gantry having a static magnetic field generating means and having an opening on the front surface, and a top plate moving means for feeding a top plate that lays the subject into the opening or retreating from the feeding position to the outside of the opening. In a magnetic resonance imaging apparatus comprising a patient table having
The direction of the static magnetic field is a direction perpendicular to the body axis of the subject,
The patient table is connected to the gantry, and swing movement means capable of swing movement along the outer periphery of the opening within the range of the front opening .
Driving means for driving a swing movement of the patient table provided at a lower part of the gantry ,
Magnetic resonance imaging characterized in that the swing feeds the top plate from a plurality of directions in the front opening into the opening, and the feeding direction is directed toward the magnetic field center in the gantry. apparatus.
請求項1記載の磁気共鳴イメージング装置において、
前記天板移動手段は、前記被検体の体軸方向である縦方向に前記天板を移動することを特徴とする磁気共鳴イメージング装置。
The magnetic resonance imaging apparatus according to claim 1.
The magnetic resonance imaging apparatus, wherein the top plate moving means moves the top plate in a longitudinal direction that is a body axis direction of the subject.
請求項2記載の磁気共鳴イメージング装置において、
前記天板移動手段は、前記縦方向に垂直な横方向に前記天板を移動することを特徴とする磁気共鳴イメージング装置。
The magnetic resonance imaging apparatus according to claim 2.
2. The magnetic resonance imaging apparatus according to claim 1, wherein the top plate moving means moves the top plate in a horizontal direction perpendicular to the vertical direction.
請求項1乃至3のいずれかに記載の磁気共鳴イメージング装置において、
前記スイング移動手段は、前記スイング移動方向に前記患者テーブルを移動させるローラを該患者テーブルの下部に有することを特徴とする磁気共鳴イメージング装置。
The magnetic resonance imaging apparatus according to any one of claims 1 to 3,
The magnetic resonance imaging apparatus, wherein the swing movement means has a roller for moving the patient table in the swing movement direction at a lower part of the patient table.
JP14488996A 1996-05-16 1996-05-16 Magnetic resonance imaging system Expired - Fee Related JP3746329B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14488996A JP3746329B2 (en) 1996-05-16 1996-05-16 Magnetic resonance imaging system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14488996A JP3746329B2 (en) 1996-05-16 1996-05-16 Magnetic resonance imaging system

Publications (2)

Publication Number Publication Date
JPH09299352A JPH09299352A (en) 1997-11-25
JP3746329B2 true JP3746329B2 (en) 2006-02-15

Family

ID=15372722

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14488996A Expired - Fee Related JP3746329B2 (en) 1996-05-16 1996-05-16 Magnetic resonance imaging system

Country Status (1)

Country Link
JP (1) JP3746329B2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3934312B2 (en) * 2000-07-11 2007-06-20 株式会社日立メディコ Magnetic resonance imaging system
JP4093736B2 (en) 2001-06-28 2008-06-04 株式会社日立メディコ Nuclear magnetic resonance diagnostic apparatus and diagnostic system
US6973689B2 (en) 2001-11-14 2005-12-13 Koninklijke Philips Electronics N.V. Docking means for medical system comprising examination device and patient support device
JP4143812B2 (en) * 2002-07-01 2008-09-03 株式会社日立メディコ Magnetic resonance imaging system
DE102010005015A1 (en) * 2010-01-19 2011-07-21 Siemens Aktiengesellschaft, 80333 Patient trolley with horizontal travel path for docking to a medical device
JP5676625B2 (en) * 2010-09-30 2015-02-25 株式会社日立メディコ Magnetic resonance imaging system
DE102018213781A1 (en) * 2018-08-16 2020-02-20 Siemens Healthcare Gmbh Method for positioning a patient within a patient reception area for a magnetic resonance examination and a corresponding magnetic resonance device

Also Published As

Publication number Publication date
JPH09299352A (en) 1997-11-25

Similar Documents

Publication Publication Date Title
CN106924888B (en) Radiotherapy equipment
KR101660826B1 (en) Magnetic field unit of an mri system for image capturing a head region
CN106924889B (en) Medical equipment
EP1709994A1 (en) Patient positioning imaging device and method
US7305263B2 (en) Magnetic navigation system and magnet system therefor
CN106924887B (en) Medical equipment
JP5751541B2 (en) Patient support table used in magnetic resonance imaging
EP1389479B1 (en) Composite system for radiation therapy
JP3746329B2 (en) Magnetic resonance imaging system
JP2000107151A (en) Magnetic resonance imaging apparatus
EP3612273B1 (en) Dual-axis ring gantry radiotherapy systems
US20070143921A1 (en) Bed apparatus and MRI apparatus
US20060260050A1 (en) Multi-table CT or MRI scanner arrangement for increasing patient throughput
JP2002078701A (en) Medical examination device
US20090289633A1 (en) positioning apparatus for a magnetic resonance imaging system
JP6750398B2 (en) Imaging device for diagnostic imaging
JP5468546B2 (en) Control of magnetic field uniformity in a movable MRI scan system
JP2637336B2 (en) Magnetic resonance tomography equipment
JP2011502591A5 (en)
US7697971B1 (en) Positioning system for an MRI
JP3961464B2 (en) Radiotherapy compound device
KR20010078738A (en) Method and device for determining access to a subsurface target
Desouza et al. MR‐guided biopsy of the breast after lumpectomy and radiation therapy using two methods of immobilization in the lateral decubitus position
JP4034874B2 (en) Sleeper and medical diagnostic imaging apparatus using the same
JP2001046448A (en) Device for connecting drive to movable baseplate of medical device

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20040813

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040823

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040903

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20050606

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20050704

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20050819

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20051017

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20051024

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20051121

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20051122

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091202

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101202

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111202

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111202

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121202

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131202

Year of fee payment: 8

LAPS Cancellation because of no payment of annual fees