JPS6411537A - Mri apparatus - Google Patents
Mri apparatusInfo
- Publication number
- JPS6411537A JPS6411537A JP62167501A JP16750187A JPS6411537A JP S6411537 A JPS6411537 A JP S6411537A JP 62167501 A JP62167501 A JP 62167501A JP 16750187 A JP16750187 A JP 16750187A JP S6411537 A JPS6411537 A JP S6411537A
- Authority
- JP
- Japan
- Prior art keywords
- high frequency
- phase synthesizer
- absorbing
- phase
- frequency amplifiers
- 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.)
- Granted
Links
Landscapes
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
PURPOSE:To protect an amplifier from reflected power due to the mismatching with the load of a high frequency amplifier, by connecting an absorbing resistor to the third output terminal of the first pi/2 phase synthesizer and the input terminal of the second pi/2 phase synthesizer. CONSTITUTION:A pi/2 phase synthesizer 1 is provided on an input side in order to drive two high frequency amplifiers 3, 4 in phase difference of 90 deg.. An absorbing resistor 2 functions to absorb the reflected power due to the mismatching of the pi/2 phase synthesizer 1. The value of the absorbing resistor 2 is made equal to the characteristic impedance of the pi/2 phase synthesizer 1 and the input impedances of the high frequency amplifiers 3, 4. Therefore, the absorbing resistors 2, 6 can be neglected with respect to an advance wave and act on a reflected wave. Therefore, the high frequency amplifiers 3, 4 can always be operated in a well-matched state and destruction due to the force of the reflected wave is avoided.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62167501A JPS6411537A (en) | 1987-07-03 | 1987-07-03 | Mri apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62167501A JPS6411537A (en) | 1987-07-03 | 1987-07-03 | Mri apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6411537A true JPS6411537A (en) | 1989-01-17 |
JPH0566810B2 JPH0566810B2 (en) | 1993-09-22 |
Family
ID=15850854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62167501A Granted JPS6411537A (en) | 1987-07-03 | 1987-07-03 | Mri apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6411537A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01214357A (en) * | 1988-02-22 | 1989-08-28 | Yokogawa Medical Syst Ltd | High frequency magnetic field generator of nuclear magnetic resonance image diagnostic apparatus |
GB2343000A (en) * | 1998-09-05 | 2000-04-26 | Bruker Analytik Gmbh | NMR spectrometer with protection from reflected harmonics |
WO2006117714A3 (en) * | 2005-04-29 | 2007-06-21 | Koninkl Philips Electronics Nv | Method and circuit arrangement for operating multi-channel transmit/receive antenna devices |
JP2009501553A (en) * | 2005-04-29 | 2009-01-22 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Power monitoring method and circuit arrangement in multi-channel transmission / reception antenna apparatus |
-
1987
- 1987-07-03 JP JP62167501A patent/JPS6411537A/en active Granted
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01214357A (en) * | 1988-02-22 | 1989-08-28 | Yokogawa Medical Syst Ltd | High frequency magnetic field generator of nuclear magnetic resonance image diagnostic apparatus |
GB2343000A (en) * | 1998-09-05 | 2000-04-26 | Bruker Analytik Gmbh | NMR spectrometer with protection from reflected harmonics |
US6452392B1 (en) | 1998-09-05 | 2002-09-17 | Bruker Analytik Gmbh | Spin resonance spectrometer with protection from reflected harmonics |
GB2343000B (en) * | 1998-09-05 | 2003-03-19 | Bruker Analytik Gmbh | Spin resonance spectrometer |
WO2006117714A3 (en) * | 2005-04-29 | 2007-06-21 | Koninkl Philips Electronics Nv | Method and circuit arrangement for operating multi-channel transmit/receive antenna devices |
JP2009501553A (en) * | 2005-04-29 | 2009-01-22 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Power monitoring method and circuit arrangement in multi-channel transmission / reception antenna apparatus |
US7615999B2 (en) | 2005-04-29 | 2009-11-10 | Koninklijke Philips Electronics N.V. | Method and circuit arrangement for operating multi-channel transmit/receive antenna devices |
Also Published As
Publication number | Publication date |
---|---|
JPH0566810B2 (en) | 1993-09-22 |
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