JPH0525492B2 - - Google Patents
Info
- Publication number
- JPH0525492B2 JPH0525492B2 JP58171147A JP17114783A JPH0525492B2 JP H0525492 B2 JPH0525492 B2 JP H0525492B2 JP 58171147 A JP58171147 A JP 58171147A JP 17114783 A JP17114783 A JP 17114783A JP H0525492 B2 JPH0525492 B2 JP H0525492B2
- Authority
- JP
- Japan
- Prior art keywords
- detection coil
- magnetic resonance
- nuclear magnetic
- predetermined position
- detection
- 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 - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 34
- 238000005481 NMR spectroscopy Methods 0.000 claims description 18
- 230000003068 static effect Effects 0.000 claims description 5
- 210000000038 chest Anatomy 0.000 description 16
- 210000001015 abdomen Anatomy 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 201000011510 cancer Diseases 0.000 description 1
- 230000005492 condensed matter physics Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001225 nuclear magnetic resonance method Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は核磁気共鳴検査装置、特に生体の核磁
気共鳴信号を計測して医学的に有用な診断情報を
得るのに適した核磁気共鳴検査装置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a nuclear magnetic resonance examination apparatus, particularly a nuclear magnetic resonance examination suitable for measuring nuclear magnetic resonance signals of a living body to obtain medically useful diagnostic information. Regarding equipment.
核磁気共鳴法は1946年ブロツホやパーセルによ
つて見いだされてから有機化合物の構造解析や物
性物理の研究に用いられてきた。1970年代になつ
てこの核磁気共鳴法を用いて悪性腫瘍を識別する
ことなど、医学方面への応用が進められ、Ｘ線
CT装置と同様に生体の断層像を得るにまでなつ
た。Ｘ線CT装置が１枚の断層像を得るのに数秒
間を要するのに対し、核磁気共鳴法を用いた検査
装置では数分間を要する。この一因は感度が低い
ことにある。核磁気共鳴現象の感度を左右する因
子はボルトによつて詳しく論じられているが、そ
の一つに共鳴子の占める体積と検出するコイルの
内容積の比η（通常フイリングフアクターと呼ば
れている）がある。感度を向上させるにはηの値
をできる限り１に近づければよい。ここで断層像
を得ようとする生体が円柱状であればこれに適合
する形状のコイルを１つ製作すれば良い。しか
し、生体の断面は、周知のように一様な形状はし
ていない。ここで説明のために生体に人間を選ん
でみる。まず頭部は最も多く撮影の対象になる部
位であるが、その断面は円に近く、より正確に言
うならば上臥状態では上下方向の長楕円である。
次に胸部は最も大きな横長の楕円体である。腹部
は胸部より小さくより横長の楕円体である。脚は
二つの円を組み合せたものである。そこで、感度
の向上を最優先にしている現在の核磁気共鳴を用
いた検査装置では、種々の検出コイルを作つてお
き、断層面の部位に合わせて検出コイルを受信系
回路に通じるコネクターに接続替えして交換する
方法がとられている。
Nuclear magnetic resonance was discovered by Brodzho and Purcell in 1946 and has since been used for structural analysis of organic compounds and research on condensed matter physics. In the 1970s, medical applications such as the identification of malignant tumors using this nuclear magnetic resonance method progressed, and X-ray
It has come to be used to obtain tomographic images of living bodies in the same way as CT devices. While it takes several seconds for an X-ray CT device to obtain one tomographic image, it takes several minutes for an examination device that uses nuclear magnetic resonance. One reason for this is low sensitivity. The factors that influence the sensitivity of nuclear magnetic resonance phenomena are discussed in detail by Bolt, and one of them is the ratio η (usually called the filling factor) of the volume occupied by the resonator and the internal volume of the detecting coil. There is). In order to improve the sensitivity, the value of η should be made as close to 1 as possible. If the living body whose tomographic image is to be obtained has a cylindrical shape, it is sufficient to manufacture one coil having a shape that matches the cylindrical shape. However, as is well known, the cross section of a living body does not have a uniform shape. For the sake of explanation, let's choose a human being as the living organism. First of all, the head is the part most often photographed, and its cross section is close to a circle, or more precisely, in the supine position, it is an elongated ellipse in the vertical direction.
Next, the thorax is the largest oblong ellipsoid. The abdomen is smaller and more oblong than the thorax. The legs are made up of two circles. Therefore, in current inspection equipment that uses nuclear magnetic resonance, which places top priority on improving sensitivity, various detection coils are created and connected to connectors leading to the receiving circuit according to the location of the tomographic plane. The method is to change and replace.
しかし、このような方式では、その交換のため
にかなりの時間が必要であるばかりでなく、一番
大きいコイルの重さは他のコイルが10Kg程度以下
であるのに対して30Kg程度にも達するためにその
交換が非常に厄介であるという問題がある。 However, with this method, not only does it take a considerable amount of time to replace the coils, but the weight of the largest coil reaches around 30 kg, whereas the other coils weigh less than 10 kg. Therefore, there is a problem in that the exchange is very troublesome.
本発明の目的は、被検体の大きさの異なる部位
の測定を効率的にかつ容易に行うのに適した核磁
気共鳴検査装置を提供することにある。
An object of the present invention is to provide a nuclear magnetic resonance examination apparatus suitable for efficiently and easily measuring parts of a subject having different sizes.
本発明の特徴は静磁場を発生するための手段
と、その静磁場中の所定位置に置かれて被検体の
核磁気共鳴信号を検出するための手段とを備えて
いる核磁気共鳴検査装置において、前記検出手段
は大きさが異なる複数個の検出コイルを含み、そ
れらのうちの一番大きい検出コイルを前記所定位
置に固定し、他の検出コイルを前記固定されてい
る検出コイルの内側に挿入して前記所定位置にセ
ツト可能にしたことにある。
A feature of the present invention is a nuclear magnetic resonance examination apparatus comprising means for generating a static magnetic field and means placed at a predetermined position in the static magnetic field for detecting nuclear magnetic resonance signals of a subject. , the detection means includes a plurality of detection coils of different sizes, the largest detection coil among them is fixed at the predetermined position, and the other detection coils are inserted inside the fixed detection coil. It is possible to set it at the predetermined position.
以下、本発明を図示する一実施例に基づき詳細
に説明する。
Hereinafter, the present invention will be described in detail based on an illustrated embodiment.
第１図〜第３図は本発明の一実施例を示す構成
図である。これらの図において、磁石１の静磁場
内に一番大きい胸部用検出コイル２が固定されて
おり、被検体である患者３は患者天板４の上に横
になつて胸部の断層面を撮影中である。このと
き、患者天板４に付属している棒５がスイツチボ
ツクス６内のスイツチ９（第３図）を押して胸部
用の検出コイル２が受信系の回路と接続され閉ル
ープ状態となつて能動状態を保持する。すなわ
ち、胸部用の検出コイル２は第３図に示すように
鞍形の形状に巻いてあり２対で１組のコイルを構
成している。この２対のコイルを接続している部
分にスイツチ９が設けてあり、スイツチ押し棒５
がスイツチ９を押圧することにより胸部用の検出
コイル２が所定の機能を発揮するようになる。胸
部の撮影が終了し同一患者で他の部位、例えば頭
部の撮影が必要になつた場合は撮影技師ないしは
オペレータは患者天板４を操作して第２図に示す
状態にする。すると、天板４にセツトされている
頭部用検出コイル７が磁石１の中心位置に移動し
て頭部断層像撮影の準備が完了する。ここで、胸
部用検出コイル２と頭部用検出コイル７が同じ位
置に配置されることになり、電気的相互干渉が問
題となるが、患者天板４の棒５がスイツチボツク
ス６のスイツチ９を切り、胸部用検出コイル２と
受信系回路との接続状態を切り離して胸部用検出
コイル２を開ループ状態にしているため、この胸
部用検出コイル２は全く機能しない状態となる。 1 to 3 are configuration diagrams showing one embodiment of the present invention. In these figures, the largest chest detection coil 2 is fixed within the static magnetic field of the magnet 1, and a patient 3, who is the subject, lies on a patient tabletop 4 and a tomographic plane of the chest is imaged. It's inside. At this time, the rod 5 attached to the patient top plate 4 pushes the switch 9 (Fig. 3) in the switchbox 6, and the chest detection coil 2 is connected to the receiving system circuit, and becomes a closed loop state and becomes active. hold. That is, the chest detection coil 2 is wound in a saddle shape as shown in FIG. 3, and two pairs constitute one set of coils. A switch 9 is provided at the part connecting these two pairs of coils, and the switch push rod 5
When the operator presses the switch 9, the chest detection coil 2 comes to perform a predetermined function. When the chest image has been completed and it becomes necessary to image another part of the same patient, for example the head, the radiographer or operator operates the patient top plate 4 to bring it into the state shown in FIG. 2. Then, the head detection coil 7 set on the top plate 4 moves to the center position of the magnet 1, and preparations for head tomography imaging are completed. Here, the detection coil 2 for the chest and the detection coil 7 for the head are arranged at the same position, and mutual electrical interference becomes a problem. Since the chest detection coil 2 is turned off and the connection state between the chest detection coil 2 and the receiving system circuit is disconnected to put the chest detection coil 2 in an open loop state, the chest detection coil 2 becomes completely inoperative.
なお、腹部用検出コイル８を磁石１の中心位置
に移動して腹部の断層像撮影を行う場合も事情は
全く同じである。 Note that the situation is exactly the same when the abdomen detection coil 8 is moved to the center position of the magnet 1 to take a tomographic image of the abdomen.
以上のように、一番大きい検出コイルは所定位
置に固定され、他の検出コイルは選択的に所定位
置にセツトされ得るようになつている。加えて、
他の検出コイルが所定位置にセツトされて機能状
態にされたとき固定された検出コイルは開ループ
にされ得るようになつている。したがつて、被検
体の大きさの異なる部位の測定を効率的に容易に
行い得るようになる。 As described above, the largest detection coil is fixed at a predetermined position, and the other detection coils can be selectively set at predetermined positions. In addition,
The fixed sensing coil can be placed into open loop when the other sensing coils are set in place and activated. Therefore, it becomes possible to efficiently and easily measure parts of a subject having different sizes.
［発明の効果］
本発明によれば、被検体の大きさの異なる部位
の測定を効率的にかつ容易に行うのに適した核磁
気共鳴検査装置が提供される。[Effects of the Invention] According to the present invention, a nuclear magnetic resonance examination apparatus suitable for efficiently and easily measuring sites of different sizes of a subject is provided.
第１図および第２図は本発明にもとづく一実施
例を示す核磁気共鳴検査装置の要部の概念図であ
つて、第１図は胸部測定の場合、第２図は頭部測
定の場合の例である。第３図は第１図および第２
図の胸部用検出コイルを含む一実施例のスイツチ
回路である。
１…磁石、２…胸部用検出コイル、３…被検
体、４…患者天板、５…スイツチ押し棒、６…ス
イツチボツクス、７…頭部用検出コイル、８…腹
部用検出コイル、９…スイツチ。
1 and 2 are conceptual diagrams of the main parts of a nuclear magnetic resonance examination apparatus showing an embodiment based on the present invention, in which FIG. 1 is for chest measurement, and FIG. 2 is for head measurement. This is an example. Figure 3 is similar to Figure 1 and 2.
1 is an example of a switch circuit including the chest detection coil shown in the figure. DESCRIPTION OF SYMBOLS 1... Magnet, 2... Detection coil for chest, 3... Subject, 4... Patient top plate, 5... Switch push rod, 6... Switch box, 7... Detection coil for head, 8... Detection coil for abdomen, 9... Switch.
Claims (1)
中の所定位置に置かれて被検体の核磁気共鳴信号
を検出するための手段とを備えている核磁気共鳴
検査装置において、前記検出手段は大きさが異な
る複数個の検出コイルを含み、それらのうちの一
番大きい検出コイルを前記所定位置に固定し、他
の検出コイルを前記固定されている検出コイルの
内側に挿入して前記所定位置にセツト可能にした
ことを特徴とする核磁気共鳴検査装置。 ２ 前記他の検出コイルを前記被検体を乗せる天
板に取付け、この天板を移動させて前記他の検出
コイルを前記所定位置にセツト可能にしたことを
特徴とする特許請求の範囲第１項に記載された核
磁気共鳴検査装置。 ３ 前記固定されている検出コイルは人体の胸部
用であることを特徴とする特許請求の範囲第１項
に記載された核磁気共鳴検査装置。 ４ 前記他の検出コイルが所定位置にセツトされ
ている状態では前記固定された検出コイルは開ル
ープ状態にされていることを特徴とする特許請求
の範囲第１，２又は３項に記載された核磁気共鳴
装置。[Claims] 1. A nuclear magnetic resonance examination comprising means for generating a static magnetic field and means placed at a predetermined position in the static magnetic field to detect a nuclear magnetic resonance signal of a subject. In the device, the detection means includes a plurality of detection coils of different sizes, the largest detection coil among them is fixed at the predetermined position, and the other detection coils are arranged inside the fixed detection coil. A nuclear magnetic resonance examination apparatus, characterized in that it can be inserted into and set at the predetermined position. 2. Claim 1, characterized in that the other detection coil is attached to a top plate on which the subject is placed, and the other detection coil can be set at the predetermined position by moving the top plate. A nuclear magnetic resonance examination device described in . 3. The nuclear magnetic resonance examination apparatus according to claim 1, wherein the fixed detection coil is for a chest of a human body. 4. The fixed detection coil is in an open loop state when the other detection coil is set at a predetermined position. Nuclear magnetic resonance apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58171147A JPS6063038A (en) | 1983-09-19 | 1983-09-19 | Nuclear magnetic resonance examination apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58171147A JPS6063038A (en) | 1983-09-19 | 1983-09-19 | Nuclear magnetic resonance examination apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6063038A JPS6063038A (en) | 1985-04-11 |
| JPH0525492B2 true JPH0525492B2 (en) | 1993-04-13 |
Family
ID=15917854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58171147A Granted JPS6063038A (en) | 1983-09-19 | 1983-09-19 | Nuclear magnetic resonance examination apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6063038A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4881034A (en) * | 1988-01-19 | 1989-11-14 | The Regents Of The University Of California | Switchable MRI RF coil array with individual coils having different and overlapping fields of view |
| US5377679A (en) * | 1988-10-27 | 1995-01-03 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging system |
-
1983
- 1983-09-19 JP JP58171147A patent/JPS6063038A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6063038A (en) | 1985-04-11 |
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