JPH036470B2 - - Google Patents
Info
- Publication number
- JPH036470B2 JPH036470B2 JP60026720A JP2672085A JPH036470B2 JP H036470 B2 JPH036470 B2 JP H036470B2 JP 60026720 A JP60026720 A JP 60026720A JP 2672085 A JP2672085 A JP 2672085A JP H036470 B2 JPH036470 B2 JP H036470B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- lead
- winding
- nmr
- present
- 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
- 239000000523 sample Substances 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 6
- 239000003989 dielectric material Substances 0.000 claims description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 11
- 230000035945 sensitivity Effects 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
- G01R33/34069—Saddle coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34092—RF coils specially adapted for NMR spectrometers
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は核磁気共鳴装置（NMR装置）のプロ
ーブに用いるコイル装置に関し、特に感度を高め
ることのできるコイルの構造に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coil device used in a probe of a nuclear magnetic resonance apparatus (NMR apparatus), and particularly to a coil structure that can increase sensitivity.
［従来技術］
NMR装置では、試料を収容したプローブを一
様な静磁場内に配置し、プローブ内の試料に近接
して配置されたコイルから励起用高周波磁界を照
射すると共に、試料かの共鳴信号をこのコイルに
よつて受信し、受信回路を介してコンピユータへ
送り、フーリエ変換処理によりNMRスペクトル
を得ている。その際、コイルと試料の共鳴子との
結合の良否がNMR装置の感度を大きく左右する
ため、コイルの形状や構造には大きな注意が払わ
れている。超伝導磁石を用いるNMR装置の場
合、例えば第３図に示すような円筒状に鞍形コイ
ルが通常用いられて来た。このコイルによつてＸ
方向に高周波磁界が発生すると共に、その高周波
磁界照射によつて試料の共鳴子が発する自由誘導
減衰信号が検出される。[Prior art] In an NMR device, a probe containing a sample is placed in a uniform static magnetic field, and a high-frequency magnetic field for excitation is irradiated from a coil placed close to the sample in the probe, and the resonance of the sample is emitted. A signal is received by this coil, sent to a computer via a receiving circuit, and an NMR spectrum is obtained by Fourier transform processing. At this time, great attention is paid to the shape and structure of the coil, as the quality of the coupling between the coil and the resonator of the sample greatly affects the sensitivity of the NMR device. In the case of NMR devices using superconducting magnets, for example, a cylindrical saddle-shaped coil as shown in FIG. 3 has been commonly used. With this coil
A high-frequency magnetic field is generated in the direction, and a free induction attenuation signal emitted by a resonator of the sample is detected by the irradiation of the high-frequency magnetic field.
［発明が解決しようとする問題点］
実際のNMRプローブでは、このコイルとコン
デンサとを組合わせて共振回路（同調回路）を構
成し、それにより自由誘導減衰信号を効率良く検
出するようにしている。この同調回路のＱを高め
ることができれば、微弱な自由誘導減衰信号を効
率良く検出することができるため、核磁気共鳴装
置の感度を高めることが可能であるが、従来はＱ
を十分に高めることはできなかつた。[Problems to be solved by the invention] In an actual NMR probe, this coil and a capacitor are combined to form a resonant circuit (tuned circuit), thereby efficiently detecting the free induction decay signal. . If the Q of this tuned circuit can be increased, weak free induction decay signals can be detected efficiently, and the sensitivity of the nuclear magnetic resonance apparatus can be increased.
could not be raised sufficiently.
その理由は、従来のNMRプローブでは、上記
コイルを静磁場の中心に配置すると共に、このコ
イルからリード線を伸ばし、コイルから離れた位
置において同調用コンデンサを接続して共振回路
を形成しているからであり、このリード線のイン
ダクタンスや浮遊容量によつて同調回路（共振回
路）のＱが高くならなかつたのである。 The reason for this is that in conventional NMR probes, the coil is placed at the center of the static magnetic field, a lead wire is extended from this coil, and a tuning capacitor is connected at a distance from the coil to form a resonant circuit. This is because the inductance and stray capacitance of the lead wires prevented the Q of the tuned circuit (resonant circuit) from becoming high.
本発明はこの点に鑑みてなされたものであり、
Ｑを十分に高めることのできるNMRプローブ用
コイル装置を提供することを目的としている。 The present invention has been made in view of this point,
The purpose of the present invention is to provide a coil device for an NMR probe that can sufficiently increase Q.
［問題点を解決するための手段］
この目的を達成するため、本発明は、円筒状の
試料領域の周囲に巻回され該円筒の軸に直交する
方向の高周波磁界を発生させる巻線部と、該巻線
部を外部回路と接続するための２つのリード部と
を備えたNMRプローブ用コイル装置において、
前記２つのリード部が重なる部分を設け、該重な
り部分に誘導体を介在させたことを特徴としてい
る。[Means for Solving the Problems] To achieve this object, the present invention provides a winding section that is wound around a cylindrical sample region and generates a high-frequency magnetic field in a direction perpendicular to the axis of the cylinder. , an NMR probe coil device comprising two lead parts for connecting the winding part to an external circuit,
The present invention is characterized in that a portion is provided where the two lead portions overlap, and a dielectric is interposed in the overlapping portion.
［作用］
本発明のコイル装置においては、前記２つのリ
ードに重なり部分を設け、該重なり部分に誘導体
を介在させているため、その部分にコンデンサが
形成される。従つて、コイルに極めて近い位置に
同調用コンデンサ接続されることになり、リード
線を伸ばして同調用コンデンサを接続していた従
来に比べ同調回路のＱは飛躍的に高められること
になる。[Function] In the coil device of the present invention, since the two leads are provided with an overlapping portion and a dielectric is interposed in the overlapping portion, a capacitor is formed in that portion. Therefore, the tuning capacitor is connected very close to the coil, and the Q of the tuning circuit is dramatically increased compared to the conventional method in which the tuning capacitor was connected by extending a lead wire.
［実施例］
以下、図面を用いて本発明の一実施例を詳述す
る。[Example] Hereinafter, an example of the present invention will be described in detail using the drawings.
第１図は本発明を実施したNMRプローブ用コ
イル装置の一例を示す。第１図ａは導体板から押
し抜いた時の状態を示し、コイルは巻線部ａと２
つのリード部ｂ１，ｂ２とから成る。第１図ｂは
それを破線Ａで折つた時の状態、第１図ｃはそれ
を更に円筒状に丸めて並列巻２ターンのコイルを
形成した状態を夫々示す。 FIG. 1 shows an example of a coil device for an NMR probe embodying the present invention. Figure 1 a shows the state when the coil is punched out from the conductor plate, and the coil has winding parts a and 2.
It consists of two lead parts b1 and b2. FIG. 1b shows the state in which it is folded along the broken line A, and FIG. 1c shows the state in which it is further rolled into a cylindrical shape to form a coil with two parallel turns.
第１図ｂのように折返すと、２つのリード部は
斜線を施した部分ｃが重なり合うが、本発明にお
いては、その重なり部分の間に高分子材料等から
成る誘電体フイルムＵを挟み込んで絶縁すること
により、その重なり部分に容量を持たせコンデン
サとしている。 When the two lead parts are folded back as shown in Fig. 1b, the hatched parts c overlap, but in the present invention, a dielectric film U made of a polymeric material or the like is sandwiched between the overlapping parts. By insulating them, the overlapping portion has a capacitance, forming a capacitor.
従つて、巻線部とリード部とを備えたコイルの
リード部に同調コンデンサが設けれ、コイルとコ
ンデンサが一体化されることになり、コイルから
リード線を伸ばして同調用コンデンサを接続して
いた従来に比べ同調回路のＱは飛躍的に高められ
ることになる。 Therefore, a tuning capacitor is provided in the lead part of a coil that has a winding part and a lead part, and the coil and capacitor are integrated, and a lead wire is extended from the coil to connect the tuning capacitor. The Q of the tuned circuit is dramatically increased compared to the conventional one.
第２図は本発明の他の実施例を示す。第２図ａ
は導体板から押し抜いた時の状態を示し、本実施
例ではリード部ｂ２が巻線部ａと交差するので別
個に作られている。そして第２図ｂに示すよう
に、このリード部ｂ２を巻線ａの端部に接続しリ
ード部ｂ１と平行にコイル外へ取出している。こ
のリード部ｂ２と巻線部との交差部分には、絶縁
フイルムＦを間に挟んで絶縁を図つている。 FIG. 2 shows another embodiment of the invention. Figure 2a
shows the state when it is punched out from the conductor plate, and in this embodiment, the lead part b2 intersects with the winding part a, so it is made separately. As shown in FIG. 2b, this lead part b2 is connected to the end of the winding a and taken out from the coil in parallel with the lead part b1. An insulating film F is sandwiched between the intersecting portions of the lead portion b2 and the winding portion for insulation.
次いでリード部ｂ１の折返し部ｂ１０を破線Ａ
で折返すと、第２図ｃに示すように斜線を施した
部分ｃがリードｂ２と重なり合うので、その重な
り部分の間に誘電体フルムＵを挟み込んで絶縁し
ている。そして、更にこれを第１図ｃと同様に円
筒状に巻けば、コイルと同調コンデンサが一体化
された直列巻２ターンのコイル装置が出来上る。 Next, the folded portion b10 of the lead portion b1 is drawn along the broken line A.
When folded back, the diagonally shaded portion c overlaps the lead b2 as shown in FIG. 2c, and a dielectric film U is sandwiched between the overlapping portions for insulation. Then, if this is further wound into a cylindrical shape in the same manner as shown in FIG.
尚、重なり合う部分の面積や誘電体材料及びそ
の厚みを適宜選ぶことによりリード部に形成する
コンデンサ容量を任意に調整できることは言うま
でもない。 It goes without saying that the capacitance of the capacitor formed in the lead portion can be arbitrarily adjusted by appropriately selecting the area of the overlapping portion, the dielectric material, and its thickness.
又、上記実施例では２ターンのコイルを例示し
たが、更にターンの多いコイルについても全く同
様に適用できる。 Further, in the above embodiment, a coil with two turns is illustrated, but the present invention can be applied in the same manner to a coil with more turns.
又、本発明のコイルは、上述した導体板からの
押し抜きの他、ボビンに導体ワイヤを張付けたり
して作成することができる。導体ワイヤの場合に
は、重なり部分の面積を大きくするため、別の板
状電極を各ワイヤに接続すれば良い。 Further, the coil of the present invention can be made by pasting a conductor wire on a bobbin, in addition to punching it out from the conductor plate described above. In the case of conductor wires, another plate-shaped electrode may be connected to each wire in order to increase the area of the overlapping portion.
［発明の効果］
以上詳述した如く、本発明によれば同調コンデ
ンサが一体化され高い共振回路のＱを持つた
NMRプローブ用コイル装置が実現されるため、
NMR装置の感度を飛躍的に向上させることが可
能となる。[Effects of the Invention] As detailed above, according to the present invention, the tuning capacitor is integrated and has a high Q of the resonant circuit.
Since the coil device for NMR probe is realized,
This makes it possible to dramatically improve the sensitivity of NMR equipment.
第１図及び第２図は夫々本発明を実施した
NMRプローブ用コイル装置の一例を示す図、第
３図は従来の鞍型コイルを説明するための図であ
る。
ａ：巻線部、ｂ１，ｂ２：リード部、ｃ：重な
り部、Ｕ：誘電体フイルム。
Figures 1 and 2 show cases in which the present invention was implemented, respectively.
FIG. 3 is a diagram showing an example of a coil device for an NMR probe, and is a diagram for explaining a conventional saddle-shaped coil. a: winding portion, b1, b2: lead portion, c: overlapping portion, U: dielectric film.
Claims (1)
軸に直交する方向の高周波磁界を発生させる巻線
部と、該巻線部を外部回路と接続するための２つ
のリード部とを備えたNMRプローブ用コイル装
置において、前記２つのリード部が重なる部分を
設け、該重なり部分に誘電体を介在させたことを
特徴とするNMRプローブ用コイル装置。 ２ 前記前記巻線部及びリード部が板状導体で形
成される特許請求の範囲第１項記載のNMRプロ
ーブ用コイル装置。[Claims] 1. A winding section that is wound around a cylindrical sample area and generates a high-frequency magnetic field in a direction perpendicular to the axis of the cylinder, and 2. A winding section for connecting the winding section to an external circuit. What is claimed is: 1. A coil device for an NMR probe comprising two lead portions, characterized in that a portion is provided where the two lead portions overlap, and a dielectric material is interposed in the overlapping portion. 2. The NMR probe coil device according to claim 1, wherein the winding portion and the lead portion are formed of a plate-shaped conductor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60026720A JPS61186842A (en) | 1985-02-14 | 1985-02-14 | Coil device for nmr probe |
| US06/828,196 US4737715A (en) | 1985-02-14 | 1986-02-10 | Coil system for nuclear magnetic resonance spectrometer probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60026720A JPS61186842A (en) | 1985-02-14 | 1985-02-14 | Coil device for nmr probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61186842A JPS61186842A (en) | 1986-08-20 |
| JPH036470B2 true JPH036470B2 (en) | 1991-01-30 |
Family
ID=12201173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60026720A Granted JPS61186842A (en) | 1985-02-14 | 1985-02-14 | Coil device for nmr probe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61186842A (en) |
-
1985
- 1985-02-14 JP JP60026720A patent/JPS61186842A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61186842A (en) | 1986-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |