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Abstract #2779

A PIN-Diode-Controlled Double-Tuned Birdcage Coil for 1H-Imaging and 31P-Spectroscopy on Mice

Maximilian N. Voelker1, Alexander M. Koenig1, Steve Braun1, Andreas H. Mahnken1, Johannes T. Heverhagen2

1Diagnostic Radiology, Philipps University, Marburg, Hessen, Germany; 2University Institute of Diagnostic, Interventional and Pediatric Radiology, Inselspital, Bern University Hospital, Bern, Switzerland

A PIN-diode switched Birdcage coil for MRI on mice at 7T had been developed. PIN-diodes are used directly on the end rings of a high pass birdcage to add a second/parallel capacitor line to a 1H-tuned Birdcage coil. Therefore the resonance frequency can be changed between proton and phosphor frequencies. The intended usage is proton imaging and spectroscopy with phosphor spectroscopy as an Add-on. The coil is easy to match and tune and shows superior SNR to a 4-Ring-BC of similar size in proton imaging, but lower SNR on phosphor resonance mode.

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Keywords

additional animal axis bias biased birdcage block blocking board boost bore brought cable capable capacitive capacitors capacity chokes circuits coil coils comparable conductors configurations connectors consisting consists controlled copper coupled cupric cylindrical decided decoupled designs develop developed diagnostic diameter diode diodes double driven drop easy etched focused foil form frequencies frequency gain gradients guided head homogeneity homogeneous hospital human hybrid in vivo inner institute integrate intended interface isolate length like living loaded long magma magnet makes matching measured mention mice mode mounted mouse much negative noise nuclear nucleus open outer outside parallel pass pediatric phantom phosphor phosphorous phosphorus preamp profile protect proton quadrature radiology resolved resonators ring rings scanner selected series shield shielded smaller spectra spectroscopy spectrum split sulfate superior supplied switched switching system transmit transmitting traps tuned tunes unloaded unshielded usage variation voltage volume wide