JPH0529689Y2 - - Google Patents
Info
- Publication number
- JPH0529689Y2 JPH0529689Y2 JP10081988U JP10081988U JPH0529689Y2 JP H0529689 Y2 JPH0529689 Y2 JP H0529689Y2 JP 10081988 U JP10081988 U JP 10081988U JP 10081988 U JP10081988 U JP 10081988U JP H0529689 Y2 JPH0529689 Y2 JP H0529689Y2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- constant circuit
- circuit section
- insulating film
- conductive material
- 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
- 239000004020 conductor Substances 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 14
- 238000000465 moulding Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 238000005481 NMR spectroscopy Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction 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
- 239000006260 foam Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、MRI（Magnetic Resonance
Imaging）装置のRF（Radio−Frequency）信号
の送受信を行うRFコイルに関する。[Detailed explanation of the invention] (Field of industrial application) This invention is based on MRI (Magnetic Resonance).
This invention relates to an RF coil that transmits and receives RF (Radio-Frequency) signals for imaging devices.
（従来の技術）
周知のようにMRI装置は、核磁気共鳴
（NMR）現象を利用して、プロトン等の特定の
原子核の密度分布や緩和時間を測定して、人体等
の断層像を得るものである。このNMR現象の測
定方法について、第３図を用いて説明する。第３
図は、従来例のMRI装置の概略図である。まず、
Ｚ方向に均一な静磁場H0を発生している主磁場
コイル１内に被検体２を挿入設置する。次に、角
速度ω0で、ラーモア歳差運動している原子核に、
RFコイル３からXY面内にω0で回転するRFパル
ス磁界を勾配磁場コイル４によるスライス勾配磁
場と共に印加してNMR現象を誘起させる。フー
リエ法では、勾配磁場コイル４による読出し勾配
磁場及びワープ勾配磁場で位置情報を与えなが
ら、前記スライス面全体からのNMR信号をRF
コイル３によつて受信する。このようにして収集
されたNMR信号は画像再構成され、水素原子核
の密度分布像（断層像）やその他の生体化学情報
をCRT表示する。(Prior art) As is well known, an MRI device uses the nuclear magnetic resonance (NMR) phenomenon to measure the density distribution and relaxation time of specific atomic nuclei such as protons to obtain tomographic images of the human body, etc. It is. A method for measuring this NMR phenomenon will be explained using FIG. 3. Third
The figure is a schematic diagram of a conventional MRI apparatus. first,
The subject 2 is inserted into the main magnetic field coil 1 which generates a uniform static magnetic field H 0 in the Z direction. Next, for a nucleus precessing Larmor with an angular velocity ω 0 ,
An RF pulse magnetic field rotating at ω 0 in the XY plane from the RF coil 3 is applied together with a slice gradient magnetic field from the gradient magnetic field coil 4 to induce an NMR phenomenon. In the Fourier method, the NMR signal from the entire slice surface is converted to RF while giving position information using a readout gradient magnetic field and a warp gradient magnetic field by the gradient magnetic field coil 4.
It is received by coil 3. The NMR signals collected in this way are reconstructed, and a density distribution image (tomogram) of hydrogen nuclei and other biochemical information are displayed on a CRT.
この様なMRI装置のRFコイルは、撮影部位に
応じて種々の形状のものがある。第４図ａは頸椎
の撮影に用いられる従来のRFコイルの斜視図で
あり、第４図ｂはその回路図である。５は１ター
ンの鞍形の形状の銅管からなる導電材であり、分
布定数回路部１０を構成する。導電材５はその形
状等に応じた固有のインダクタンス１３を持つ。
６，７及び８は導電材５の周縁上に直列に接続さ
れた共振用コンデンサであり、インピーダンス変
換を行つている。９はコンデンサ６の両端に接続
された受信用の端子である。１５は受信用のRF
コイルとその外側に配置される送信用のコイルと
の磁気的カツプリングを防止するデカツプリング
回路であり、クロスダイオード及びインダクタン
スより成る。コンデンサ６，７及び８、及び、デ
カツプリング回路１５で集中定数回路部２０を構
成する。分布定数回路部１０及び集中定数回路部
２０は、これらの腐蝕防止と絶縁及び被検体の安
全性のため、共に全体が熱可塑性の発泡樹脂１６
でモールドされている。 The RF coil of such an MRI apparatus has various shapes depending on the region to be imaged. FIG. 4a is a perspective view of a conventional RF coil used for imaging the cervical vertebrae, and FIG. 4b is a circuit diagram thereof. Reference numeral 5 denotes a conductive material made of a one-turn saddle-shaped copper tube, which constitutes a distributed constant circuit section 10 . The conductive material 5 has a unique inductance 13 depending on its shape and the like.
Resonant capacitors 6, 7, and 8 are connected in series on the periphery of the conductive material 5, and perform impedance conversion. 9 is a reception terminal connected to both ends of the capacitor 6. 15 is RF for reception
This is a decoupling circuit that prevents magnetic coupling between a coil and a transmitting coil placed outside the coil, and consists of a cross diode and an inductance. The capacitors 6, 7, and 8 and the decoupling circuit 15 constitute a lumped constant circuit section 20. The distributed constant circuit section 10 and the lumped constant circuit section 20 are both entirely made of thermoplastic foamed resin 16 for corrosion prevention, insulation, and safety of the test object.
It is molded with.
ところで、上記のようなRFコイルの修理や改
良のときには集中定数回路部２０に手を加える場
合が殆どである。又、上記のRFコイルは、全体
が発泡樹脂１６でモールドされているため製造の
際その形状に固有の型が必要である。更に、集中
定数回路部２０を構成する電気部品は一般に耐熱
性に乏しく熱可塑性の発泡樹脂１６でモールドす
ると高熱の影響を受けてしまう。 Incidentally, when repairing or improving the RF coil as described above, the lumped constant circuit section 20 is almost always modified. Further, since the above-mentioned RF coil is entirely molded with foamed resin 16, a mold specific to its shape is required during manufacturing. Furthermore, the electrical components constituting the lumped constant circuit section 20 generally have poor heat resistance, and if molded with thermoplastic foam resin 16, they will be affected by high heat.
（考案が解決しようとする課題）
しかし従来のRFコイルにあつては、RFコイル
が故障した場合、又は、RFコイルを改良する場
合には、発泡樹脂１６を破壊して取り除かねばな
らず、実質上、修理、改良が不可能であつた。
又、RFコイルを製造する場合、モールドのため
にその形状に固有の型が必要である。そして、異
なる形状のものを作る度に異なる型を使用しなけ
ればならなかつた。更に、分布定数回路部１０、
及び、集中定数回路部２０が共に全体が熱可塑性
の発泡樹脂１６でモールドされているので、製造
段階において集中定数回路部２０が熱によつて破
壊されることが度々あつた。これらの理由で、製
造コストが高く付いてしまうという問題があつ
た。(Problem to be solved by the invention) However, in the case of the conventional RF coil, when the RF coil breaks down or when the RF coil is improved, the foamed resin 16 must be destroyed and removed. However, it was impossible to repair or improve it.
Also, when manufacturing an RF coil, a mold specific to its shape is required for the mold. And each time a different shape was made, a different mold had to be used. Furthermore, a distributed constant circuit section 10,
Furthermore, since the lumped constant circuit section 20 is entirely molded with thermoplastic foamed resin 16, the lumped constant circuit section 20 was often destroyed by heat during the manufacturing stage. For these reasons, there was a problem in that the manufacturing cost was high.
本考案は上記に鑑みてなされたもので、その目
的は、製造コストが低く、メインテナンスが容易
なRFコイルを実現するにある。 The present invention was devised in view of the above, and its purpose is to realize an RF coil that is low in manufacturing cost and easy to maintain.
（課題を解決するための手段）
上記目的を達成するRFコイルは、導電材を所
定の形にして絶縁性の膜で被覆した分布定数回路
部と、分布定数回路部を側面に設けられた孔によ
つて固定保持する部材であつて分布定数回路部に
電磁気的に接続する集中定数回路部を収納する収
納部とからなるものである。(Means for solving the problem) The RF coil that achieves the above purpose consists of a distributed constant circuit part made of a conductive material in a predetermined shape and covered with an insulating film, and a distributed constant circuit part made of a conductive material formed into a predetermined shape and covered with an insulating film, and a hole provided on the side of the distributed constant circuit part. This is a member that is fixedly held by a holder and a housing part that houses a lumped constant circuit part that is electromagnetically connected to the distributed constant circuit part.
又、好ましくは、前記絶縁性の膜はシリコンチ
ユーブ、ビニルチユーブ等の軟性のチユーブを被
覆したもの、又は、導電材の表面にポリ塩化ビニ
ル等の合成樹脂をデイツプ成形したもの、又は、
絶縁性の塗料を塗布したものである。 Preferably, the insulating film is one coated with a soft tube such as a silicon tube or a vinyl tube, or one formed by dip-molding a synthetic resin such as polyvinyl chloride on the surface of a conductive material, or
It is coated with insulating paint.
又、好ましくは、前記収納部は開閉可能な蓋を
備えたものである。 Preferably, the storage section is provided with a lid that can be opened and closed.
（作用）
集中定数回路部が収納部に収納されているので
分布定数回路部の被覆を取り除くことなく集中定
数回路部を修理、改良できる。又、分布定数回路
部は絶縁性の膜で被覆されているので、RFコイ
ルをその形状に固有の型を用いることなく容易に
製造でき、更に、分布定数回路部の被覆の際に集
中定数回路部を被覆することはない。(Function) Since the lumped constant circuit section is housed in the storage section, the lumped constant circuit section can be repaired or improved without removing the covering of the distributed constant circuit section. In addition, since the distributed constant circuit section is covered with an insulating film, the RF coil can be easily manufactured without using a mold specific to the shape of the RF coil. The parts are not covered.
（実施例）
以下本考案のRFコイルを図面を参照して説明
する。(Example) The RF coil of the present invention will be described below with reference to the drawings.
第１図は、本考案の一実施例によるRFコイル
を表す図である。図において第４図と同一記号は
同一意味を示す。本実施例のRFコイルの電気回
路の構成は従来例と同様である。分布定数回部１
０を構成する銅管でできた導電材５は、腐蝕防止
と絶縁及び被検体の安全性のためシリコンのチユ
ーブ１１で被覆されている。第２図は分布定数回
路部１０のＡ−A′における断面を示す図である。
また、１２は収納部を構成するプラスチツクから
なる収納箱であり、収納箱１２の側面に設けられ
た孔によつてチユーブ１１で被覆された導電材５
の端部を固定保持する。収納箱１２の内部には導
電材５と電磁気的に接続された集中定数回路部２
０が収納されている。１４は捩子によつて収納箱
１２に取り付けられた蓋である。 FIG. 1 is a diagram showing an RF coil according to an embodiment of the present invention. In the figure, the same symbols as in FIG. 4 indicate the same meanings. The configuration of the electric circuit of the RF coil of this embodiment is the same as that of the conventional example. Distributed constant part 1
A conductive material 5 made of a copper tube constituting 0 is covered with a silicon tube 11 for corrosion prevention, insulation, and safety of the subject. FIG. 2 is a diagram showing a cross section of the distributed constant circuit section 10 along line A-A'.
Further, 12 is a storage box made of plastic constituting a storage section, and a conductive material 5 covered with the tube 11 is formed through a hole provided on the side surface of the storage box 12.
Hold the end of the Inside the storage box 12 is a lumped constant circuit section 2 that is electromagnetically connected to the conductive material 5.
0 is stored. 14 is a lid attached to the storage box 12 with a screw.
上記の構成において、RFコイルを改良をする
場合や、RFコイルが故障した場合には、分布定
数回路部１０の被覆を取り除くことなく集中定数
回路部２０の改良、修理ができる。即ち、ドライ
バー等で捩子を緩めて蓋１４を開けて、収納箱１
２の内部の電気部品を交換又は修理する。又、製
造段階では、導電材５を所望の形状に加工して、
シリコンのチユーブ１１を形状に沿つて被覆す
る。従つて、従来のようにモールドのための型を
特別に用意する必要がない。そのため異なる形状
のRFコイルを製造する場合に好都合である。更
に、従来のように集中定数回路部２０の電気部品
がモールドの際の熱で破壊されることがないので
歩留まりが高い。 In the above configuration, when the RF coil is to be improved or if the RF coil breaks down, the lumped constant circuit section 20 can be improved or repaired without removing the covering of the distributed constant circuit section 10. That is, loosen the screw with a screwdriver or the like, open the lid 14, and open the storage box 1.
Replace or repair the internal electrical parts of 2. Also, at the manufacturing stage, the conductive material 5 is processed into a desired shape,
Cover the silicone tube 11 along the shape. Therefore, there is no need to prepare a special mold for the mold as in the conventional case. Therefore, it is convenient when manufacturing RF coils of different shapes. Furthermore, the electrical components of the lumped constant circuit section 20 are not destroyed by heat during molding, unlike in the prior art, resulting in a high yield.
上記実施例では、絶縁材は導電材５に軟性のチ
ユーブで被覆したものであつたが、ラテツクス、
ポリ塩化ビニル樹脂等をデイツプ成形によつて被
覆すれば更に安価に製造できる。本考案によれ
ば、絶縁材が被覆に際して熱を必要とするもので
も問題はない。この場合、導電材５に被覆を施し
てから、収納箱１２及び集中定数回路部２０を取
り付ければよい。又、絶縁性の塗料を導電材５の
表面を塗装したものでも安価である。 In the above embodiment, the insulating material was the conductive material 5 covered with a soft tube, but latex,
If it is coated with polyvinyl chloride resin or the like by dip molding, it can be manufactured at a lower cost. According to the present invention, there is no problem even if the insulating material requires heat during coating. In this case, the storage box 12 and the lumped constant circuit section 20 may be attached after the conductive material 5 is coated. It is also inexpensive to coat the surface of the conductive material 5 with an insulating paint.
尚、本考案のRFコイルは、実用新案登録請求
の範囲内で種々の変形が可能である。軟性のチユ
ーぶはビニルチユーブ等他のものでもよい。又、
収納部即ち収納箱１２及び蓋１４の材質、形状を
限定するものではない。又、上記実施例は受信専
用のものであつたが、送受信用のものでも良い。
この場合、デカツプリング回路１５は省略でき
る。又、コイルの入出力部には、一般的に用いら
れている平衡不平衡変換のためのバラン
（balanced unbalanced transformor）回路を前
記コンデンサ６と端子９の間に接続しても良い。
更に、導電材５は、銅以外でも、電気伝導性の良
い材質、例えば、銀又は銅に銀メツキを施したも
の等で作り、形状は管状でなく、棒又は箔で構成
することも可能である。 Note that the RF coil of the present invention can be modified in various ways within the scope of the utility model registration claims. The soft tube may be of other materials, such as a vinyl tube. or,
The material and shape of the storage section, that is, the storage box 12 and the lid 14 are not limited. Furthermore, although the above embodiment is for reception only, it may also be for transmission and reception.
In this case, the decoupling circuit 15 can be omitted. Further, a commonly used balanced/unbalanced transformer circuit may be connected between the capacitor 6 and the terminal 9 at the input/output section of the coil.
Furthermore, the conductive material 5 can be made of a material with good electrical conductivity other than copper, such as silver or copper plated with silver, and the shape is not tubular, but can also be made of a rod or foil. be.
（考案の効果）
以上、説明の通り、本考案のRFコイルは、導
電材を所定の形にして絶縁性の膜で被覆した分布
定数回路部と、分布定数回路部を固定保持する部
材であつて分布定数回路部に電磁気的に接続する
集中定数回路部を収納する収納部とからなる構成
となつている。そのため、分布定数回路部の被覆
を取り除くことなく集中定数回路部を修理、改良
できるので、メインテナンスが容易である。又、
RFコイルは被覆の際に形状に固有の型を必要と
せず容易に製造でき、更に、集中定数回路部を破
壊することがないので、低廉なコストで製造でき
る。(Effects of the invention) As explained above, the RF coil of the invention consists of a distributed constant circuit part made of a conductive material in a predetermined shape and covered with an insulating film, and a member that fixes and holds the distributed constant circuit part. and a housing section that houses a lumped constant circuit section that is electromagnetically connected to the distributed constant circuit section. Therefore, the lumped constant circuit section can be repaired or improved without removing the covering of the distributed constant circuit section, so maintenance is easy. or,
The RF coil can be easily manufactured without requiring a shape-specific mold for coating, and furthermore, since the lumped constant circuit section is not destroyed, it can be manufactured at low cost.
又、特に、前記絶縁性の膜として軟性のチユー
ブを被覆したもの、又、導電材の表面に合成樹脂
をデイツプ成形したもの、又は、絶縁性の塗料を
塗布したものは、上記効果に加え更に低廉なコス
トで製造ができる。 In addition, in particular, those in which a soft tube is coated as the insulating film, those in which a synthetic resin is dip-molded on the surface of a conductive material, or those in which an insulating paint is applied have additional effects in addition to the above-mentioned effects. Can be manufactured at low cost.
又、特に、前記収納部として開閉可能な蓋を備
えたものは、上記効果に加え更にメインテナンス
が容易である。 Further, in particular, the storage section provided with an openable/closeable lid provides easier maintenance in addition to the above-mentioned effects.
第１図は、本考案の一実施例を表わす構成図、
第２図は第１図Ａ−A′における断面を示す図、
第３図は従来例のMRI装置の概略図、第４図ａ
及びｂは従来例を表す構成図である。
１……静磁場マグネツト、２……被検体、３…
…RFコイル、４……勾配磁場コイル、５……導
電部、６，７，８……共振用コンデンサ、９……
端子、１１……チユーブ、１２……収納箱、１３
……インダクタンス、１４……蓋、１５……デカ
ツプリング回路、１６……発泡樹脂、１０……分
布定数回路部、２０……集中定数回路部。
FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A' in FIG. 1;
FIG. 3 is a schematic diagram of a conventional MRI apparatus.
1 and 2 are diagrams showing a configuration of a conventional example. 1: static magnetic field magnet; 2: subject; 3:
...RF coil, 4...gradient magnetic field coil, 5...conductive part, 6, 7, 8...resonant capacitor, 9...
Terminal, 11...tube, 12...storage box, 13
. . . inductance, 14 . . lid, 15 . . . decoupling circuit, 16 . . . foamed resin, 10 . . . distributed constant circuit section, 20 . . lumped constant circuit section.
Claims (1)
た分布定数回路部と、分布定数回路部を側面に
設けられた孔によつて固定保持する部材であつ
て分布定数回路部に電磁気的に接続する集中定
数回路部を収納する収納部とからなるRFコイ
ル。 (2) 前記絶縁性の膜は軟性のチユーブを被覆した
ものである請求項(1)記載のRFコイル。 (3) 前記絶縁性の膜は合成樹脂を導電材の表面に
デイツプ成形したものである請求項(1)記載の
RFコイル。 (4) 前記絶縁性の膜は絶縁性の塗料を塗布したも
のである請求項(1)記載のRFコイル。 (5) 前記収納部は開閉可能な蓋を備えた箱である
請求項(1)記載のRFコイル。[Claims for Utility Model Registration] (1) A distributed constant circuit section made of conductive material shaped into a predetermined shape and covered with an insulating film, and a member that fixes and holds the distributed constant circuit section through holes provided on the side surface. An RF coil comprising a housing section that houses a lumped constant circuit section that is electromagnetically connected to a distributed constant circuit section. (2) The RF coil according to claim 1, wherein the insulating film covers a flexible tube. (3) The insulating film according to claim (1), wherein the insulating film is formed by dip-molding a synthetic resin on the surface of a conductive material.
RF coil. (4) The RF coil according to claim 1, wherein the insulating film is coated with an insulating paint. (5) The RF coil according to claim 1, wherein the storage section is a box with an openable and closable lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10081988U JPH0529689Y2 (en) | 1988-07-29 | 1988-07-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10081988U JPH0529689Y2 (en) | 1988-07-29 | 1988-07-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0223506U JPH0223506U (en) | 1990-02-16 |
| JPH0529689Y2 true JPH0529689Y2 (en) | 1993-07-29 |
Family
ID=31329243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10081988U Expired - Lifetime JPH0529689Y2 (en) | 1988-07-29 | 1988-07-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0529689Y2 (en) |
-
1988
- 1988-07-29 JP JP10081988U patent/JPH0529689Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0223506U (en) | 1990-02-16 |
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