Phased array MRI coil with controllable coupled ring resonator
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United States of America Patent
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Jun 5, 2007
Grant Date -
Jul 20, 2006
app pub date -
Jan 14, 2005
filing date -
Jan 14, 2005
priority date (Note) -
Expired
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Abstract
A coil for magnetic resonance imaging operates in a transmit mode with multiple loops locked together in a phase relationship like a birdcage coil to provide a uniform transmission field, but in a receive mode like a phased array coil, each coil operating independently to produce a separate signal for reception by the MRI machine. Phasing of the coil during transmit mode is provided by a ring resonator controllably coupled to the loops. Controllable coupling is provided by a series of current limiting elements interposed between the resonant ring and the loops of the coil.
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