Patent ID: 8680863
Filing Date: 2014-03-25
Classification: G01R

Abstract:
1. An apparatus for double resonance MRI, comprising: a cylindrical birdcage coil having a pair of opposed outer rings and a pair of opposed inner rings connected to a plurality of equally spaced vertical legs collectively forming a double resonant coil; at least one tuning ring disposed within said cylindrical birdcage coil inductively coupled with at least one said outer ring, said tuning ring configured to decrease an effective inductance of said outer ring thereby adjusting a resonance frequency of said double resonant coil responsive to a positional change of said tuning ring; said pair of opposed inner rings being disposed between said pair of opposed outer rings; and said at least one tuning ring being a pair of opposed tuning rings each being adjustable within said cylindrical birdcage coil between said outer ring and said inner ring, respectively.