JPH0415904U - - Google Patents
Info
- Publication number
- JPH0415904U JPH0415904U JP5830690U JP5830690U JPH0415904U JP H0415904 U JPH0415904 U JP H0415904U JP 5830690 U JP5830690 U JP 5830690U JP 5830690 U JP5830690 U JP 5830690U JP H0415904 U JPH0415904 U JP H0415904U
- Authority
- JP
- Japan
- Prior art keywords
- coil
- output terminal
- current input
- diode
- current
- 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
- 238000005481 NMR spectroscopy Methods 0.000 claims description 3
- 238000003325 tomography Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims 1
- 230000003068 static effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 1
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Description
第１図ないし第５図は、この考案の一実施例に
係り、第１図はダイオードスイツチング回路図、
第２図は核磁気共鳴断層撮影装置の全体斜視図、
第３図はＲＦコイルの等価回路図、第４図はＲＦ
電流波形図、第５図はダイオードスイツチング回
路の取り付け例を示したＲＦコイルの等価回路図
である。また、第６図は従来のダイオードスイツ
チング回路図である。
１ａ……送信用ＲＦコイル、１ｂ……受信用Ｒ
Ｆコイル、２……直流バイアス電源、３……ダイ
オードスイツチング回路、Ｄ１〜Ｄ４……ＰＩＮ
ダイオード、Ｔ１，Ｔ２……直流バイアス電流の
入出力端子、Ｔ３，Ｔ４……ＲＦ電流の入出力端
子。
1 to 5 relate to an embodiment of this invention, and FIG. 1 is a diode switching circuit diagram;
Figure 2 is an overall perspective view of the nuclear magnetic resonance tomography device;
Figure 3 is the equivalent circuit diagram of the RF coil, Figure 4 is the RF coil.
The current waveform diagram and FIG. 5 are equivalent circuit diagrams of an RF coil showing an example of mounting a diode switching circuit. Moreover, FIG. 6 is a conventional diode switching circuit diagram. 1a...RF coil for transmission, 1b...R for reception
F coil, 2...DC bias power supply, 3...Diode switching circuit, D1-D4...PIN
Diode, T1, T2...DC bias current input/output terminal, T3, T4...RF current input/output terminal.
Claims (1)
励起するための電磁波を送信する送信用ＲＦコイ
ルと、励起された原子核スピンが元の状態に戻る
際に放出する信号波を受信する受信用ＲＦコイル
と、各ＲＦコイルに取り付けられてＲＦコイルの
同調と非同調の切り換えを行うダイオードスイツ
チング回路とを備えた核磁気共鳴断層撮影装置に
おいて、前記ダイオードスイツチング回路を、前
記ＲＦコイルを流れるＲＦ電流の入出力端子と、
直流バイアス電流の入出力端子と、この直流バイ
アス電流によつて前記ＲＦ電流の入出力端子間を
開閉するように、前記各端子間に配されたダイオ
ードと、前記直流バイアス電流の入出端子間を短
絡して過大なＲＦ電流を前記ＲＦ電流の入出力端
子間に流すコンデンサ素子とからなるブリツジ回
路で、構成したことを特徴とする核磁気共鳴断層
撮影装置。 A transmitting RF coil that transmits electromagnetic waves to excite nuclear spins within a subject placed in a static magnetic field, and a receiving RF coil that receives signal waves emitted when the excited nuclear spins return to their original state. In a nuclear magnetic resonance tomography apparatus comprising an RF coil and a diode switching circuit attached to each RF coil to switch between tuning and non-tuning of the RF coil, RF current input/output terminal,
A diode is arranged between each terminal, and a diode is connected between the DC bias current input/output terminal and the RF current input/output terminal so as to open/close between the DC bias current input/output terminal and the RF current input/output terminal by the DC bias current. 1. A nuclear magnetic resonance tomography apparatus comprising a bridge circuit including a capacitor element that is short-circuited and causes an excessive RF current to flow between input and output terminals of the RF current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5830690U JPH0415904U (en) | 1990-05-31 | 1990-05-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5830690U JPH0415904U (en) | 1990-05-31 | 1990-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0415904U true JPH0415904U (en) | 1992-02-10 |
Family
ID=31583795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5830690U Pending JPH0415904U (en) | 1990-05-31 | 1990-05-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0415904U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7609064B2 (en) | 2006-06-05 | 2009-10-27 | Hitachi, Ltd. | Probe configured for NMR apparatus and NMR apparatus using the same |
| JP2010210480A (en) * | 2009-03-11 | 2010-09-24 | Hitachi Ltd | Signal transmitting/receiving circuit, signal transmitting/receiving apparatus, nmr probe, and nuclear magnetic resonance apparatus |
-
1990
- 1990-05-31 JP JP5830690U patent/JPH0415904U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7609064B2 (en) | 2006-06-05 | 2009-10-27 | Hitachi, Ltd. | Probe configured for NMR apparatus and NMR apparatus using the same |
| JP2010210480A (en) * | 2009-03-11 | 2010-09-24 | Hitachi Ltd | Signal transmitting/receiving circuit, signal transmitting/receiving apparatus, nmr probe, and nuclear magnetic resonance apparatus |
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