JPS6437215U - - Google Patents
Info
- Publication number
- JPS6437215U JPS6437215U JP13253187U JP13253187U JPS6437215U JP S6437215 U JPS6437215 U JP S6437215U JP 13253187 U JP13253187 U JP 13253187U JP 13253187 U JP13253187 U JP 13253187U JP S6437215 U JPS6437215 U JP S6437215U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- coil
- gradient magnetic
- shim coil
- coupling
- 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
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 6
- 230000002123 temporal effect Effects 0.000 description 2
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Description
第１図は本考案の一実施例のＮＭＲイメージン
グ装置のカツプリング補正回路を表わす図、第２
図は本考案の一実施例によるシムコイルの誘起電
流の周波数特性及びその電流の時間的変化を表わ
す図、第３図は本考案の一実施例のパルス電流の
波形及び勾配磁場波形を表わす図、第４図は本考
案の他の実施例のカツプリング補正フイルターを
表わす回路図、第５図は従来例のＮＭＲイメージ
ング装置を表わす概略図、第６図は従来例のパル
ス電流の波形及び勾配磁場波形を表わす図、第７
図は従来例のパルス電流の波形及び勾配磁場波形
を表わす図、第８図は従来例のシムコイルの誘起
電流の周波数特性及びその電流の時間的変化を表
わす図である。
１……静磁場マグネツト、２……シムコイル、
３……勾配磁場コイル、４……ＲＦコイル、５…
…シムコイル電源、６……勾配磁場コイル電源、
７……スキヤンコントローラ、８……コンピユー
タ、９……ＣＲＴ、１０……ＲＦ回路、１１……
カツプリング補正フイルター、１２……ＣＲ微分
回路。
FIG. 1 is a diagram showing a coupling correction circuit of an NMR imaging apparatus according to an embodiment of the present invention, and FIG.
The figure is a diagram showing the frequency characteristics of the induced current of the shim coil and the temporal change of the current according to one embodiment of the present invention, and FIG. 3 is a diagram showing the pulse current waveform and gradient magnetic field waveform of one embodiment of the present invention. FIG. 4 is a circuit diagram showing a coupling correction filter according to another embodiment of the present invention, FIG. 5 is a schematic diagram showing a conventional NMR imaging apparatus, and FIG. 6 is a pulse current waveform and gradient magnetic field waveform of a conventional example. Diagram representing 7th
The figure shows the pulse current waveform and the gradient magnetic field waveform of the conventional example, and FIG. 8 shows the frequency characteristics of the induced current of the conventional shim coil and the temporal change of the current. 1...Static magnetic field magnet, 2...Shim coil,
3... Gradient magnetic field coil, 4... RF coil, 5...
...Shim coil power supply, 6...Gradient magnetic field coil power supply,
7...Scan controller, 8...Computer, 9...CRT, 10...RF circuit, 11...
Coupling correction filter, 12...CR differential circuit.
Claims (1)
コイルと、前記静磁場に線形勾配磁場を重畳する
勾配磁場コイルとのカツプリングにより勾配磁場
の乱れを防ぐＮＭＲイメージング装置のカツプリ
ング補正回路において、前記シムコイルとシムコ
イル電源との間に設置され、シムコイルと前記電
源内のコンデンサーが共振点を持たないように周
波数特性を設定するフイルター手段と、前記勾配
磁場コイルへの電流波形に微分操作を加える手段
とを具備することを特徴とするＮＭＲイメージン
グ装置のカツプリング補正回路。 In a coupling correction circuit of an NMR imaging apparatus that prevents disturbance of a gradient magnetic field by coupling a shim coil that corrects the static magnetic field distribution by the main magnetic field coil and a gradient magnetic field coil that superimposes a linear gradient magnetic field on the static magnetic field, the shim coil and the shim coil power supply are provided. and a filter means installed between the shim coil and the capacitor in the power source to set frequency characteristics so that the shim coil and the capacitor in the power supply do not have a resonance point, and means for applying a differential operation to the current waveform to the gradient magnetic field coil. A coupling correction circuit for an NMR imaging device characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13253187U JPS6437215U (en) | 1987-08-31 | 1987-08-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13253187U JPS6437215U (en) | 1987-08-31 | 1987-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6437215U true JPS6437215U (en) | 1989-03-07 |
Family
ID=31389577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13253187U Pending JPS6437215U (en) | 1987-08-31 | 1987-08-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6437215U (en) |
-
1987
- 1987-08-31 JP JP13253187U patent/JPS6437215U/ja active Pending
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