JPH022685U - - Google Patents
Info
- Publication number
- JPH022685U JPH022685U JP4691289U JP4691289U JPH022685U JP H022685 U JPH022685 U JP H022685U JP 4691289 U JP4691289 U JP 4691289U JP 4691289 U JP4691289 U JP 4691289U JP H022685 U JPH022685 U JP H022685U
- Authority
- JP
- Japan
- Prior art keywords
- radio frequency
- frequency coil
- coil system
- transmission line
- rectangular
- 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
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000005284 excitation Effects 0.000 claims 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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3678—Electrical details, e.g. matching or coupling of the coil to the receiver involving quadrature drive or detection, e.g. a circularly polarized RF magnetic field
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Description
図面は、本考案による方形無線周波コイル系の
切替回路を示すものである。
２……第１コイル、４，１４……同調キヤパシ
テイ、６，１６……整合キヤパシテイ、８……０
．２５λ伝送ライン、１２……第２コイル、１８
……０．５λ伝送ライン、２０……調整可能な短
絡回路、２２……アツテネータ、２４……切替器
、２６……励磁器、２８……検出器。
The drawing shows a switching circuit for a rectangular radio frequency coil system according to the present invention. 2...First coil, 4,14...Tuning capacity, 6,16...Matching capacity, 8...0
．． 25λ transmission line, 12...second coil, 18
...0.5λ transmission line, 20...adjustable short circuit, 22...attenuator, 24...switcher, 26...exciter, 28...detector.
Claims (1)
無線周波コイル系において、 無線周波コイル系の第１コイル用の０．２５λ
伝送ラインにさらに、無線周波コイル系の第２コ
イル用として、励磁中短絡可能な０．５λ伝送ラ
インを付加して成ることを特徴とする方形無線周
波コイル系。 ２ 伝送ラインは同軸ケーブルで構築され、また
０．５λ伝送ラインは、ＰＩＮダイオード回路に
よりシヤントされていることを特徴とする請求項
１記載の方形無線周波コイル系。 ３ アツテネータがコイルの１つの供給線に結合
していることを特徴とする請求項１または２に記
載の方形無線周波コイル系。 ４ 請求項１，２または３のうちいずれか１つに
記載の方形無線周波コイル系を含む磁気共振装置
。[Claims for Utility Model Registration] 1. In a rectangular radio frequency coil system for exciting and detecting magnetic resonance signals, 0.25λ for the first coil of the radio frequency coil system.
A rectangular radio frequency coil system characterized in that the transmission line further includes a 0.5λ transmission line that can be short-circuited during excitation for a second coil of the radio frequency coil system. 2. The rectangular radio frequency coil system according to claim 1, wherein the transmission line is constructed of a coaxial cable, and the 0.5λ transmission line is shunted by a PIN diode circuit. 3. Rectangular radio frequency coil system according to claim 1 or 2, characterized in that the attenuator is coupled to one supply line of the coil. 4. A magnetic resonance device comprising a rectangular radio frequency coil system according to any one of claims 1, 2 or 3.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8801078A NL8801078A (en) | 1988-04-26 | 1988-04-26 | Quadrature RF coil system for NMR equipment - has 0.5 lamda transmission line installed for second coil, shorted during generation, next to installing 0.25 lamda line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH022685U true JPH022685U (en) | 1990-01-09 |
Family
ID=19852205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4691289U Pending JPH022685U (en) | 1988-04-26 | 1989-04-24 |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH022685U (en) |
| NL (1) | NL8801078A (en) |
-
1988
- 1988-04-26 NL NL8801078A patent/NL8801078A/en not_active Application Discontinuation
-
1989
- 1989-04-24 JP JP4691289U patent/JPH022685U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NL8801078A (en) | 1989-11-16 |