发明名称 |
Discrete step remotely adjustable matching circuit for MRI RF coils |
摘要 |
An RF coil tuning circuit is disclosed in which two banks of parallel capacitive branches are provided. Each capacitive branch includes a fixed value capacitor, a relay and a PIN diode connected in series. An impedance of the tuning circuit is adjusted to the optimum VSWR=1 condition by first switching the eight PIN diodes to learn which open/closed condition applies the fixed value capacitors in the optimum combination. Then, the PIN diodes are all closed and the optimum combination is applied using the open/closed states of the relays.
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申请公布号 |
US5670881(A) |
申请公布日期 |
1997.09.23 |
申请号 |
US19960599071 |
申请日期 |
1996.02.09 |
申请人 |
TOSHIBA AMERICA, INC. |
发明人 |
ARAKAWA, MITSUAKI;VAN HETEREN, JOHN G.;CARLSON, JOSEPH W.;KAUFMAN, LEON;TAPIO, EINAR |
分类号 |
A61B5/055;G01R33/36;(IPC1-7):G01R33/34;H01P5/08 |
主分类号 |
A61B5/055 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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