JPS63286142A - Magnetic resonance imaging apparatus - Google Patents
Magnetic resonance imaging apparatusInfo
- Publication number
- JPS63286142A JPS63286142A JP62121857A JP12185787A JPS63286142A JP S63286142 A JPS63286142 A JP S63286142A JP 62121857 A JP62121857 A JP 62121857A JP 12185787 A JP12185787 A JP 12185787A JP S63286142 A JPS63286142 A JP S63286142A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- permanent magnet
- magnetic resonance
- gap
- yoke
- 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.)
- Pending
Links
- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 17
- 230000005291 magnetic effect Effects 0.000 claims abstract description 82
- 230000003068 static effect Effects 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims description 2
- 229910052779 Neodymium Inorganic materials 0.000 abstract description 2
- 239000003302 ferromagnetic material Substances 0.000 abstract description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 abstract description 2
- 238000003745 diagnosis Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 210000003423 ankle Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001513 elbow Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000399 orthopedic effect Effects 0.000 description 1
- 210000000278 spinal cord Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、磁気共鳴 （Ｍ Ｒ： ｍａｏｎｅｔｉｃｒ
ｅｓｏｎａｎｃｅ ）現象を利用して被検体（生体）の
特定の部位における特定の原子核のスピン密度分布や化
学シフト等による解剖学的情報及び質的情報の少なくと
も一方を、信号処理によりイメージングする磁気共鳴イ
メージング装置に関し、特に、静磁場発生用の磁石装置
を改良して小型化に対応できるようにした磁気共鳴イメ
ージング装置に関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to magnetic resonance (MR)
Magnetic resonance imaging that uses signal processing to image at least one of anatomical information and qualitative information based on the spin density distribution, chemical shift, etc. of a specific atomic nucleus in a specific part of a subject (living body) using the phenomenon (esonance). The present invention relates to an apparatus, and particularly relates to a magnetic resonance imaging apparatus in which a magnet apparatus for generating a static magnetic field is improved so as to be compatible with miniaturization.
（従来の技術）
磁気共鳴イメージングは、原理的には静磁場中に配置し
た被検体の全部位を励起し且つ信号収・集することがで
きるものであるが、装置構成上の制約やイメージング像
の臨床上の要請から、実際の装置としては特定部位に対
する励起とその信号収集を行うようにしている。たとえ
ば医用診断用の磁気共鳴イメージング装置では、被検者
を載置する寝台と、静磁場発生装置と、傾斜磁場を発生
するための傾斜磁場発生コイル装置と、回転高周波磁場
を送信すると共に誘起されたＭＲ倍信号検出するための
送受信系であるプローブコイル装置とにより本体部を構
成し、静磁場電源装置、傾斜磁場電源装置、送受信ユニ
ット、傾斜磁場電源装置及び送受信ユニットを所望のパ
ルスシーケンスにて駆動するシーケンサ、これらを制御
すると共に検出信号の信号処理及びその表示を行うコン
ピュータシステムにより構成されている。(Prior art) Magnetic resonance imaging is, in principle, capable of exciting all parts of a subject placed in a static magnetic field and collecting signals. Due to clinical demands, the actual device excites a specific region and collects its signals. For example, a magnetic resonance imaging device for medical diagnosis includes a bed on which a subject is placed, a static magnetic field generator, a gradient magnetic field generator coil device for generating gradient magnetic fields, and a rotating high-frequency magnetic field that is transmitted and induced. The main body is composed of a probe coil device which is a transmitting and receiving system for detecting MR multiplied signals, and a static magnetic field power supply device, a gradient magnetic field power supply device, a transmitting and receiving unit, a gradient magnetic field power supply device and a transmitting and receiving unit are connected in a desired pulse sequence. It is composed of a driving sequencer and a computer system that controls these and performs signal processing of detection signals and display thereof.
このような構成では、静磁場発生装置による静磁場中に
寝台上の被検者を配置すると共に、シーケンサの動作に
よるパルスシーケンスにより送信ユニットを駆動して例
えばプローブコイル装置の送信コイルから回転磁場とし
て９０度パルス及び１８０度パルスを加えると共に傾斜
磁場電源装置を駆動して傾斜磁場発生コイル装置からは
傾斜磁場を加える。そうすると、被検者にはＭＲ現象が
生じ、誘起されたＭＲ倍信号プローブコイル装置の受信
コイルにより検出し、コンピュータシステムに取込んで
画像再構成処理等の信号処理を施すことにより、断層像
等のイメージング情報を得、映像表示等を行なうように
している。In such a configuration, a subject on a bed is placed in a static magnetic field generated by a static magnetic field generator, and a transmitting unit is driven by a pulse sequence generated by the operation of a sequencer to generate a rotating magnetic field from a transmitting coil of a probe coil device, for example. A 90-degree pulse and a 180-degree pulse are applied, and a gradient magnetic field power supply device is driven to apply a gradient magnetic field from a gradient magnetic field generating coil device. Then, an MR phenomenon occurs in the subject, and the induced MR multiplied signal is detected by the receiving coil of the probe coil device, and is imported into a computer system and subjected to signal processing such as image reconstruction processing, thereby producing a tomographic image. The system obtains imaging information and displays images.
ここで、静磁場発生装置としては、雷カコストの低減を
図ることができる等の利点がある永久磁石を用いた構成
が注目され、近年になって開発された強磁性材料により
数千ガウス程度の磁場強度を得ることができるようにな
り、この神の磁石装置に要求される高磁場化には応じら
れるようになってきている。そこで、第２図に示すよう
に、６面体状のヨーク１を構成し、このヨーク１の対向
２片１ａ、１ｂに永久磁石からなる磁極２を設けて、永
久磁石型静磁場発生装置を構成したものがある。Here, as a static magnetic field generator, a structure using a permanent magnet is attracting attention due to its advantages such as being able to reduce the cost of lightning. It has become possible to obtain magnetic field strength, and it has become possible to meet the high magnetic field requirements of this divine magnet device. Therefore, as shown in FIG. 2, a hexahedral yoke 1 is constructed, and magnetic poles 2 made of permanent magnets are provided on two opposing pieces 1a and 1b of this yoke 1, thereby constructing a permanent magnet type static magnetic field generator. There is something I did.
この構成では、上述した全部位のイメージングを実施す
る等のために、被検者導入空間を始めとする装置サイズ
は大きなものとなっている。例えば診断に利用できる磁
場均一性５０ ｐｐｍを示す球空間ＤＳＶは直径３５〜
５Ｑｃｍ、磁極直径りは１２０〜１６００ｍ１対向２片
１ａ、１ｂの片サイズＬは２００ｃｍとなっている。In this configuration, the size of the apparatus, including the space for introducing the subject, is large in order to carry out imaging of all parts described above. For example, a spherical space DSV with a magnetic field uniformity of 50 ppm that can be used for diagnosis has a diameter of 35~
The diameter of the magnetic pole is 120 to 1600 m1, and the size L of the two opposing pieces 1a and 1b is 200 cm.
このような構成によれば、通常に用いられる超電導又は
常電導の全身用円筒型電磁石を用いたものと同様に、被
検者を磁石内空洞に導入操作することにより被検者の全
部位を診断対象とし、サジタル、コロナル、アキシャル
、オブリーク等の像を得ることができ、各種の診療科目
に汎用となる臨床情報を得ることがでるようになる。し
かし乍、装置重量は数トン−数十トンなかには１００ト
ンにも及ぶものがあり、極めて大きくなってしまってい
た。従って、超重量機器であるがために建屋内設置条件
は著しく厳しいものとなっていた。これは、この磁気共
鳴イメージング装置は、今までのＸ線ＣＴスキャナ装置
等のルーチン診断機器に比べて、種類の異なる有益な情
報をもたらしているものであるにかかわらず、その普及
を阻害している要因ともなっており、問題となっていた
。According to such a configuration, all parts of the subject can be examined by introducing the subject into the cavity inside the magnet, similar to those using normally used superconducting or normal conducting cylindrical electromagnets for the whole body. It is possible to obtain sagittal, coronal, axial, oblique, etc. images for diagnosis, and to obtain general-purpose clinical information for various medical departments. However, the weight of the equipment is several tons to several tens of tons, and some even reach 100 tons, making it extremely large. Therefore, since the equipment is extremely heavy, the conditions for installing it inside the building are extremely strict. Although this magnetic resonance imaging device provides a different type of useful information compared to routine diagnostic equipment such as conventional X-ray CT scanners, it has hindered its widespread use. This was a problem as it was also a factor in the problem.
（発明が解決しようとする問題点）
このように従来の技術による永久磁石を用いた磁気共鳴
イメージング装置では、各種の診療科目に汎用となる臨
床情報を得ることがでるように構成しているため、超重
量機器となってしまい、建屋内設置条件を著しく厳しい
ものとし、問題であった。(Problems to be Solved by the Invention) As described above, the conventional magnetic resonance imaging apparatus using permanent magnets is configured to be able to obtain general-purpose clinical information for various medical departments. This was a problem because it was an extremely heavy piece of equipment and the conditions for installing it inside the building were extremely strict.
そこで本発明は、診療科目毎の装置として構成でき、装
置重量を軽減した磁気共鳴イメージング装置を提供する
ことを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic resonance imaging apparatus which can be configured as an apparatus for each medical department and whose weight is reduced.
［発明の構成］
（問題点を解決するための手段）
本発明は上記問題点を解決し且つ目的を達成するために
次のような手段を講じた構成としている。すなわち、本
発明は、静磁場中に被検体を配置すると共に傾斜磁場及
び励起用高周波磁場を印加することにより前記被検体の
特定部位に磁気共鳴現象を生じせしめ、この現象により
誘起した磁気共鳴信号を検出し信号処理を施すことによ
り前記被検体の解剖学的情報及び質的情報のうち少なく
とも一方をイメージングする磁気共鳴イージング装置に
おいて、前記静磁場を、永久磁石による−６＝
磁極を略Ｕ字形状ヨークの対向二脚に設けた永久磁石本
体と、この永久磁石本体のヨークの渡り部を軸支して起
倒運動１回動運動、上下運動のうち少なくともひとつを
行う支持機構とを備えた磁石装置により発生する構成と
し、前記永久磁石本体の対向磁極間のギャップ長を２０
〜３０ｃｍとし、このギャップに、磁場均一性を１ｏｏ
ｐｐｍ以下とした直径１０〜１５０１の球状静磁場空間
を形成する構成としたことを特徴とする。[Structure of the Invention] (Means for Solving the Problems) The present invention has a structure in which the following measures are taken to solve the above problems and achieve the object. That is, the present invention places a subject in a static magnetic field and applies a gradient magnetic field and a high-frequency magnetic field for excitation to cause a magnetic resonance phenomenon in a specific part of the subject, and generates a magnetic resonance signal induced by this phenomenon. In a magnetic resonance easing device that images at least one of anatomical information and qualitative information of the subject by detecting and performing signal processing, the static magnetic field is generated by a permanent magnet, and the magnetic pole is approximately U-shaped. A permanent magnet main body provided on two opposing legs of a shaped yoke, and a support mechanism that pivotally supports the transition portion of the yoke of the permanent magnet main body to perform at least one of an up/down movement and an up/down movement. The structure is generated by a magnet device, and the gap length between the opposing magnetic poles of the permanent magnet body is 20.
~30cm, and the magnetic field uniformity is 1oo in this gap.
It is characterized by having a configuration that forms a spherical static magnetic field space with a diameter of 10 to 1,501 ppm or less.
（作用）
このような構成によれば、永久磁石による磁極を略Ｕ字
形状ヨークの対向二脚に設けた永久磁石本体は小型に構
成でき、しかも起倒１回動、上下することができるので
、所望の位置に診断空間となる磁場均一空間を設定でき
るようになり、脚部診断等では診断空間つまり磁場均一
空間は直径１０〜１５ｃｍの球状静磁場空間で済み、ま
た、被検体配置空間つまり磁極ギャップは２０〜３０ｃ
ｍ程度で充分であるので、診療科目毎の装置として有利
となり、装置重量は軽減したものとなる。(Function) According to such a configuration, the permanent magnet main body, in which the magnetic poles of the permanent magnet are provided on the two opposing legs of the approximately U-shaped yoke, can be constructed in a small size, and moreover, it can be raised and lowered once and moved up and down. , it is now possible to set a uniform magnetic field space that serves as a diagnostic space at a desired position, and for leg diagnosis, etc., the diagnostic space, that is, the uniform magnetic field space, can be a spherical static magnetic field space with a diameter of 10 to 15 cm. Magnetic pole gap is 20~30c
Since approximately m is sufficient, it is advantageous as a device for each medical department, and the weight of the device is reduced.
（実施例）
以下本発明かかる磁気共鳴イメージング装置を、その要
部である静磁轡発生用磁石装置について第１図を参照し
て説明亨る。(Example) The magnetic resonance imaging apparatus according to the present invention will be described below with reference to FIG. 1 regarding the main part thereof, a magnet device for generating a static magnetic field.
第１図に示すように、本実施例における磁石装置は、永
久磁石本体１０と、この永久磁石本体１０を支持する支
持機構２０とから構成されている。As shown in FIG. 1, the magnet device in this embodiment is comprised of a permanent magnet body 10 and a support mechanism 20 that supports this permanent magnet body 10.
永久磁石本体１０は、例えば強磁性体としてネオジウム
を用いた磁極１０ａ１．１０ａ２を、略Ｕ字形状ヨーク
１０ｂの対向二脚端部に設け、これにより端部開放のヘ
ッドホーン型磁石を構成する。また、対向磁極１０ａ１
．１０ａ２間のギャップ長（ＩＧを３０ｃｎ＋とし、こ
のギャップに、磁場均一性を１ｏ ｏ ｐｐｍ以下とし
た直径１０ｃｍの球状静磁場空間を形成する構成として
いる。The permanent magnet main body 10 has magnetic poles 10a1 and 10a2 using neodymium as a ferromagnetic material, for example, provided at the ends of two opposing legs of a substantially U-shaped yoke 10b, thereby forming a headphone-type magnet with open ends. Moreover, the opposing magnetic pole 10a1
．． The gap length between 10a2 (IG) is set to 30cn+, and a spherical static magnetic field space with a diameter of 10cm with magnetic field uniformity of 100 ppm or less is formed in this gap.
支持機４１１１ｉ２０は、直立スタンド２０ａに支持装
置２０ｂを設けた構成であり、この支持装置２０ｂはヨ
ーク１０ｂの渡り部を軸支して図示のように起倒運動Ａ
９回動運動Ｂ、上下運動Ｃを行う構成、どなっている。The support device 4111i20 has a structure in which a support device 20b is provided on an upright stand 20a.
9.The structure performs rotational movement B and vertical movement C, and it is amazing.
ここで、装置の具体例について説明する。Here, a specific example of the device will be described.
先ず、磁極１０ａ１．１０ａ２について説明する。First, the magnetic poles 10a1 and 10a2 will be explained.
ギャップ磁束密度ＢＱを２２００ガウスとし、ギャップ
長２ｑを３０ｃｍとし、
磁極断面積ＡＯをπＸ （３０Ｘ１／２）２ ＝７０７
７（ただし、磁極直径Ｄ＝３０ｃ＋ｎ）とする。The gap magnetic flux density BQ is 2200 Gauss, the gap length 2q is 30 cm, and the magnetic pole cross-sectional area AO is πX (30X1/2)2 = 707
7 (however, the magnetic pole diameter D=30c+n).
その他に、
Ｈｍ：磁石が持つ起磁力（Ｏｅ）とし１．９ｍ：１６長
（ＣＩ）とし、
ｆ：起磁力損失係数＝１．２とし、
８ｍ：１１石が発生する磁束密度（Ｇ）とし、Ａｍ：磁
石断面積（０）とし、
σ：Ｉれ係数＝２倍とする。In addition, Hm: Magnetomotive force (Oe) possessed by the magnet, 1.9m: 16 length (CI), f: Magnetomotive force loss coefficient = 1.2, 8m: Magnetic flux density (G) generated by 11 stones. , Am: Magnet cross-sectional area (0), σ: I coefficient = 2 times.
ここで、
８ｍ−Ａｍ−ｃｒ−ＢＣ）−ＡＣＩあり、Ａｑ＝Ａｍと
して、
Ｂｍ＝４４００ガウスとなる。Here, with 8m-Am-cr-BC)-ACI and Aq=Am, Bm=4400 Gauss.
磁石のＢ−ＨカーブによりＨｍ＝４４００（Ｏｅ）とな
る。According to the B-H curve of the magnet, Hm=4400 (Oe).
Ｈｍ−ρｍ＝ｆ−Ｂｑ−ρｑ
１ｍ＝（ｆ−Ｂｑ−ｎＱ）／）１ｍ＝（１，２Ｘ２２０
０Ｘ３０）／４４００＝１８ （Ｃ１１１）以上により
、磁石長ｇｍは１８ｃｍでよいことになり、これを本実
施例の場合では、Ｓ極、Ｎ極の２磁極１０ａｊ、１０ａ
２に分割しているので、磁極１０ａ１．１０ａ２はそれ
ぞれ直径３０ｃｍで、長さ９ｃｍのものをギャップ長３
０ｃｍで対向して隔てることにより、ＤＳＶが１０φの
２２００ガウスの静磁場発生用の永久磁石を構成できる
ことになる。Hm-ρm=f-Bq-ρq 1m=(f-Bq-nQ)/)1m=(1,2X220
0X30)/4400=18 (C111) From the above, the magnet length gm can be 18 cm, and in the case of this example, the two magnetic poles 10aj and 10a, the S pole and the N pole.
Since the magnetic poles 10a1 and 10a2 are each 30cm in diameter and 9cm long, the gap length is 3.
By opposing and separating them by 0 cm, a permanent magnet for generating a static magnetic field of 2200 Gauss with a DSV of 10φ can be constructed.
また、本実施例で用いる磁石の密度重量は７．４ｑ／ｃ
ｍ”であるので、 磁極１０．ａｌ。In addition, the density weight of the magnet used in this example is 7.4q/c
m”, so the magnetic pole 10.al.
１０ａ２の一個の重量Ｗは、次のようになる。The weight W of one piece of 10a2 is as follows.
Ｗ＝磁極断面積Ａｑ： ７０７Ｘ９Ｘ７．４＝４７０
８６．２ｇつまり４７ｋＱであり、総重量Ｗは９４ＫＱ
であり、１００ＫＯ以下となる。W=Magnetic pole cross-sectional area Aq: 707X9X7.4=470
86.2g or 47kQ, total weight W is 94KQ
, and it will be less than 100 KO.
一方、ヨーク１０ｂを含めると全体は磁極１０ａｌ 、
１０ａ２の重量の６倍程度にて構成できるので、本実施
例の磁石装置は、９４Ｘ６＝５６４Ｋｇとなる。ここで
、傾斜磁場発生用コイル、送受信コイル、Ｎ源装置、コ
ンピュータシステム等を含んでも、本実施例による磁気
共鳴イメージング装置は、６００ＫＯ程度になる。On the other hand, if the yoke 10b is included, the entire magnetic pole 10al,
Since the magnet device of this embodiment can be constructed with a weight of about 6 times the weight of 10a2, the weight is 94×6=564Kg. Here, even if the gradient magnetic field generating coil, the transmitting/receiving coil, the N source device, the computer system, etc. are included, the magnetic resonance imaging apparatus according to this embodiment has approximately 600 KO.
このように本実施例による磁気共鳴イメージング装置は
、従来は数トン−数十トンであったものを６００ＫＯ程
度に大幅に軽量にできたので、建屋内設置条件は著しく
軽減されたものとなり、装置の普及要因を生み出すこと
になる。As described above, the magnetic resonance imaging apparatus according to this embodiment can be significantly reduced in weight from several tons to several tens of tons to approximately 600 KO, so the installation conditions inside the building are significantly reduced, and the equipment This will create a dissemination factor.
また、本実施例では被検体配置空間であるギャップ長は
３０ｃｍであり、また診断空間ＤＳ■は１ｏφであるも
のの一方を開放として奥行きを深くした構成であるので
、支持機構２０により永久磁石本体１０を起倒１回動、
上下することができ、従って、所望の位置に診断空間と
なる磁場均一空間を設定できるようになり、診療科目に
よってはこの程度の寸法で充分なものである。例えば、
眼科では片目だけを診断対象とするのが通例であるので
、診断空間ＤＳＶは１０φで充分である。整形外科では
足首、肘９手首等を診断対象とするので、診断空間ＤＳ
Ｖは１０φで充分である。を椎。Furthermore, in this embodiment, the gap length, which is the space for arranging the subject, is 30 cm, and the diagnostic space DS■ has a diameter of 1oφ, but one side is open and the depth is increased. Raise and lower once,
It can be moved up and down, making it possible to set a uniform magnetic field space serving as a diagnostic space at a desired position, and this size is sufficient for some medical departments. for example,
In ophthalmology, it is customary to diagnose only one eye, so a diagnostic space DSV of 10φ is sufficient. In orthopedic surgery, the ankle, elbow, wrist, etc. are the subject of diagnosis, so the diagnostic space DS
V of 10φ is sufficient. The spine.
を髄等も診断空間ＤＳＶ１０φでヘルニア症、むちうち
症等を診断できる。つまり、本実施例による磁気共鳴イ
メージング装置は、小さい空間を診断対象とした小型機
器であるので、診療科目毎の専用ルーチン診断機器とし
て有益なものとなる。Herniosis, whiplash, etc. can be diagnosed using the diagnostic space DSV10φ for the spinal cord. In other words, since the magnetic resonance imaging apparatus according to the present embodiment is a small device that diagnoses a small space, it is useful as a dedicated routine diagnostic device for each medical department.
本発明は上記実施例に限定されるものではなく、形状及
びその寸法等について本発明の要旨を逸脱しない範囲で
種々変形して実施できるものである。The present invention is not limited to the above-mentioned embodiments, but can be implemented with various modifications in shape, dimensions, etc., without departing from the gist of the present invention.
［発明の効果Ｊ
以上のように本発明によれば、静磁場を、永久磁石によ
る１１極を略Ｕ字形状ヨークの対向二脚に設けた永久磁
石本体と、この永久磁石本体のヨークの渡り部を軸支し
て起倒運動９回動運動、上下運動のうち少なくともひと
つを行う支持機構とを備えた磁石装置により発生する構
成とし、前記永久磁石本体の対向磁極間のギャップ長を
２０〜３０ｃｍとし、このギャップに、磁場均一性を１
００ ｐｐｍ以下とした直径１０〜１５ｃｍの球状静ｍ
ｍ空間を形成する構成としたことにより、永久磁石によ
る磁極を略Ｕ字形状ヨークの対向二脚に設けた永久磁石
本体は小型に構成でき、しかも起倒９回動、上下するこ
とができるので、所望の位置に診断空間となる磁場均一
空間を設定できるようになり、脚部診断等では診断空間
つまり磁場均一空間は直径１０〜１５ｃｍの球状静磁場
空間で済み、また、被検体配置空間つまり磁極ギャップ
は２０〜３０ｃｍ程度で充分であるので、診療科目毎の
装置として有利となり、装置重量は軽減したものとなる
。よって、本発明によれば、診療科目毎の装置として構
成でき、装置重量を軽減した磁気共鳴イメージング装置
を提供することができる。[Effect of the Invention J As described above, according to the present invention, a static magnetic field is transmitted between a permanent magnet body in which 11 poles of permanent magnets are provided on two opposing legs of a substantially U-shaped yoke, and a bridge between the yoke of this permanent magnet body. The structure is generated by a magnet device equipped with a support mechanism that pivotally supports the permanent magnet body to perform at least one of nine rotational movements and vertical movements, and the gap length between the opposing magnetic poles of the permanent magnet body is 20 to 20. 30 cm, and the magnetic field uniformity is set to 1 in this gap.
Spherical static m with a diameter of 10 to 15 cm with a concentration of 00 ppm or less
By adopting the configuration that forms the m space, the permanent magnet main body, in which the magnetic poles of the permanent magnet are provided on the opposing bipods of the approximately U-shaped yoke, can be constructed in a small size, and can also be turned up and down nine times and raised and lowered. , it is now possible to set a uniform magnetic field space that serves as a diagnostic space at a desired position, and for leg diagnosis, etc., the diagnostic space, that is, the uniform magnetic field space, can be a spherical static magnetic field space with a diameter of 10 to 15 cm. Since a magnetic pole gap of about 20 to 30 cm is sufficient, it is advantageous as a device for each medical department, and the weight of the device is reduced. Therefore, according to the present invention, it is possible to provide a magnetic resonance imaging apparatus which can be configured as an apparatus for each medical department and whose weight is reduced.
第１図は本発明による磁気共鳴イメージング装置の要部
である磁石装置の一実施例の構成を示す斜視図、第２図
は従来例による磁気共鳴イメージング装置の要部である
磁石装置の一実施例の構成を示す斜視図である。
１０・・・永久磁石本体、１０ａ１．１０ａ２・・・磁
極、１０ｂ・・・略Ｕ字形状ヨーク、２０・・・支持機
構。FIG. 1 is a perspective view showing the configuration of an embodiment of a magnet device which is a main part of a magnetic resonance imaging apparatus according to the present invention, and FIG. 2 is an implementation of a magnet device which is a main part of a conventional magnetic resonance imaging apparatus. FIG. 2 is a perspective view showing an example configuration. DESCRIPTION OF SYMBOLS 10... Permanent magnet main body, 10a1.10a2... Magnetic pole, 10b... Approximately U-shaped yoke, 20... Support mechanism.
Claims (1)
高周波磁場を印加することにより前記被検体の特定部位
に磁気共鳴現象を生じせしめ、この現象により誘起した
磁気共鳴信号を検出し信号処理を施すことにより前記被
検体の解剖学的情報及び質的情報のうち少なくとも一方
をイメージングする磁気共鳴イージング装置において、
前記静磁場を、永久磁石による磁極を略Ｕ字形状ヨーク
の対向二脚に設けた永久磁石本体と、この永久磁石本体
のヨークの渡り部を軸支して起倒運動、回動運動、上下
運動のうち少なくともひとつを行う支持機構とを備えた
磁石装置により発生する構成とし、前記永久磁石本体の
対向二脚間のギャップ長を２０〜３０ｃｍとし、このギ
ャップに、磁場均一性を１００ｐｐｍ以下とした直径１
０〜１５ｃｍの球状静磁場空間を形成する構成としたこ
とを特徴とする磁気共鳴イメージング装置。By placing a subject in a static magnetic field and applying a gradient magnetic field and a high-frequency magnetic field for excitation, a magnetic resonance phenomenon is caused in a specific part of the subject, and a magnetic resonance signal induced by this phenomenon is detected and signal processing is performed. In a magnetic resonance easing apparatus that images at least one of anatomical information and qualitative information of the subject by performing
The static magnetic field is applied to a permanent magnet body in which magnetic poles of permanent magnets are provided on two opposing legs of a substantially U-shaped yoke, and a transition portion of the yoke of this permanent magnet body is pivotally supported to perform vertical movement, rotational movement, and vertical movement. The structure is generated by a magnet device including a support mechanism that performs at least one of the movements, the gap length between the two opposing legs of the permanent magnet body is 20 to 30 cm, and the magnetic field uniformity is set to 100 ppm or less in this gap. Diameter 1
A magnetic resonance imaging apparatus characterized in that it is configured to form a spherical static magnetic field space of 0 to 15 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62121857A JPS63286142A (en) | 1987-05-19 | 1987-05-19 | Magnetic resonance imaging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62121857A JPS63286142A (en) | 1987-05-19 | 1987-05-19 | Magnetic resonance imaging apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63286142A true JPS63286142A (en) | 1988-11-22 |
Family
ID=14821651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62121857A Pending JPS63286142A (en) | 1987-05-19 | 1987-05-19 | Magnetic resonance imaging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63286142A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0678893A (en) * | 1992-09-04 | 1994-03-22 | Hitachi Medical Corp | Magnetic resonance imaging device |
| EP0637755A1 (en) * | 1993-08-02 | 1995-02-08 | Koninklijke Philips Electronics N.V. | Magnetic resonance imaging apparatus |
| EP0654675A1 (en) * | 1993-11-22 | 1995-05-24 | Picker International, Inc. | Magnetic resonance apparatus and methods |
| US5565834A (en) * | 1992-03-19 | 1996-10-15 | Oxford Instruments Limited | Magnetic assembly for a nuclear magnetic resonance imaging system |
| EP0927889A2 (en) * | 1998-01-02 | 1999-07-07 | General Electric Company | Adjustable interventional magnetic resonance imaging magnet |
| EP0943929A2 (en) * | 1998-03-19 | 1999-09-22 | Picker International, Inc. | Magnetic resonance apparatus |
| EP0984293A1 (en) * | 1998-08-31 | 2000-03-08 | Esaote S.p.A. | Nuclear magnetic resonance imaging apparatus |
| WO2010149686A1 (en) | 2009-06-23 | 2010-12-29 | Sirona Dental Systems Gmbh | Magnetic field unit of an mri system for image capturing a head region |
| CN107088068A (en) * | 2017-06-30 | 2017-08-25 | 王照阁 | A kind of novel magnetic resonance imaging device |
-
1987
- 1987-05-19 JP JP62121857A patent/JPS63286142A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5565834A (en) * | 1992-03-19 | 1996-10-15 | Oxford Instruments Limited | Magnetic assembly for a nuclear magnetic resonance imaging system |
| JPH0678893A (en) * | 1992-09-04 | 1994-03-22 | Hitachi Medical Corp | Magnetic resonance imaging device |
| EP0637755A1 (en) * | 1993-08-02 | 1995-02-08 | Koninklijke Philips Electronics N.V. | Magnetic resonance imaging apparatus |
| EP0654675A1 (en) * | 1993-11-22 | 1995-05-24 | Picker International, Inc. | Magnetic resonance apparatus and methods |
| EP0927889A3 (en) * | 1998-01-02 | 2001-04-18 | General Electric Company | Adjustable interventional magnetic resonance imaging magnet |
| EP0927889A2 (en) * | 1998-01-02 | 1999-07-07 | General Electric Company | Adjustable interventional magnetic resonance imaging magnet |
| EP0943929A2 (en) * | 1998-03-19 | 1999-09-22 | Picker International, Inc. | Magnetic resonance apparatus |
| EP0943929A3 (en) * | 1998-03-19 | 2000-04-19 | Picker International, Inc. | Magnetic resonance apparatus |
| EP0984293B1 (en) * | 1998-08-31 | 2012-03-21 | Esaote S.p.A. | Nuclear magnetic resonance imaging apparatus |
| US6278274B1 (en) | 1998-08-31 | 2001-08-21 | Esaote S.P.A. | Nuclear magnetic resonance imaging apparatus having a magnetic structure that oscillates about an axis |
| EP0984293A1 (en) * | 1998-08-31 | 2000-03-08 | Esaote S.p.A. | Nuclear magnetic resonance imaging apparatus |
| WO2010149686A1 (en) | 2009-06-23 | 2010-12-29 | Sirona Dental Systems Gmbh | Magnetic field unit of an mri system for image capturing a head region |
| KR20120049236A (en) * | 2009-06-23 | 2012-05-16 | 시로나 덴탈 시스템스 게엠베하 | Magnetic field unit of an mri system for image capturing a head region |
| CN102803982A (en) * | 2009-06-23 | 2012-11-28 | 塞隆纳牙科系统有限责任公司 | Magnetic field unit of an MRI system for image capturing a head region |
| JP2012530574A (en) * | 2009-06-23 | 2012-12-06 | シロナ・デンタル・システムズ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | Magnetic field unit of MRT system for head imaging |
| US8847597B2 (en) | 2009-06-23 | 2014-09-30 | Sirona Dental Systems Gmbh | Magnetic field unit of an MRT system for image capturing a head region |
| CN102803982B (en) * | 2009-06-23 | 2015-09-30 | 西诺德牙科设备有限公司 | For the magnetic field units of the MRT system in the mode head region to provide image |
| CN107088068A (en) * | 2017-06-30 | 2017-08-25 | 王照阁 | A kind of novel magnetic resonance imaging device |
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