JPS6443246A - Detection system for magnetic resonance imaging apparatus - Google Patents
Detection system for magnetic resonance imaging apparatusInfo
- Publication number
- JPS6443246A JPS6443246A JP62201303A JP20130387A JPS6443246A JP S6443246 A JPS6443246 A JP S6443246A JP 62201303 A JP62201303 A JP 62201303A JP 20130387 A JP20130387 A JP 20130387A JP S6443246 A JPS6443246 A JP S6443246A
- Authority
- JP
- Japan
- Prior art keywords
- detection
- signal
- change
- over switches
- magnetic resonance
- 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
Abstract
PURPOSE:To eliminate the effect of the offset error generated with the amplification, filtering and detection in a detection system, by subtracting the DC offset error obtained at the time of non-detection from detection data. CONSTITUTION:At the time of the non-detection of a signal, change-over switches 12g1, 12g2 are closed and change-over switches 12i1, 12i2 are opened and the DC offset errors due to amplifiers 12b1, 12b2, filters 12e1, 12e2 and an oscillator 12c are held to offset registers 12h1, 12h2. Next, at the time of the detection of the signal, the change-over switches 12g1, 12g2 are opened while the change-over switches 12i1, 12i2 are closed and the magnetic resonance signal detected by a probe 4 is amplified by a preamplifier 12a and further amplified by the amplifiers 12b1, 12b2 to be detected in a phase and unnecessary signal components are removed by the filters 12e1, 12e2. Thereafter, said signal is converted to a digital signal by sample holding circuit built-in A/D converters 12f1, 12f2 to be taken in subtractors 12j1, 12j2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62201303A JPS6443246A (en) | 1987-08-12 | 1987-08-12 | Detection system for magnetic resonance imaging apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62201303A JPS6443246A (en) | 1987-08-12 | 1987-08-12 | Detection system for magnetic resonance imaging apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6443246A true JPS6443246A (en) | 1989-02-15 |
Family
ID=16438761
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62201303A Pending JPS6443246A (en) | 1987-08-12 | 1987-08-12 | Detection system for magnetic resonance imaging apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6443246A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4989066A (en) * | 1989-01-26 | 1991-01-29 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor package |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005080384A (en) * | 2003-08-29 | 2005-03-24 | Calsonic Kansei Corp | Electric fan control unit |
JP2005299407A (en) * | 2004-04-07 | 2005-10-27 | Toyota Motor Corp | Cooling system, method for controlling the same, and automobile |
JP2007049835A (en) * | 2005-08-10 | 2007-02-22 | Hitachi Ltd | Device and method for controlling rotating electric machine |
-
1987
- 1987-08-12 JP JP62201303A patent/JPS6443246A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005080384A (en) * | 2003-08-29 | 2005-03-24 | Calsonic Kansei Corp | Electric fan control unit |
JP2005299407A (en) * | 2004-04-07 | 2005-10-27 | Toyota Motor Corp | Cooling system, method for controlling the same, and automobile |
JP2007049835A (en) * | 2005-08-10 | 2007-02-22 | Hitachi Ltd | Device and method for controlling rotating electric machine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4989066A (en) * | 1989-01-26 | 1991-01-29 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor package |
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