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Abstract #0538

A Quadrature HEM11 Mode Resonator as a New Volume Coil for High Field MRI

MAGNA25Sebastian Arnold Aussenhofer1, Josef Hubensteiner2, Andrew G. Webb2

1Department of Radiology, Leiden University Medical Center, C.J.Gorter Center for High Field MRI, Leiden, Zuid-Holland, Netherlands; 2Department of Radiology, Leiden University Medical Center, C.J.Gorter Center for High Field MRI, Leiden, Zuid-Holland, Netherlands

A cavity resonator based on water as a dielectric is simulated, designed and tested to excite the degenerate quadrature HEM11 modes for a human 7T magnet. Results of the electromagnetic simulation show good RF homogeneity for an annular resonator with different parts of the body inside the annulus. Images of the wrist of a healthy human volunteer were acquired, showing the promise of this new type of high field volume resonator.

Keywords

agent annulus another body capacitors cavity ceramics circular clarity coil coils college compartment concentric concepts configuration constructed construction contrast copper coupling cylinder cylinders cylindrical degenerate degrees deionized demonstrating derived design designed designs determined devices diameter dielectric dimensions doping electromagnetic elements eliminates empirical even example excite extremely extremities field form frequency geometry gradient healthy homogeneous human identical impedance implemented incorporated initial inner inside instead invisible known larger length loops loss lumped made make makes matched matching material materials measured medical mineral mode modes mounted muscle operating outer outline outside package paramagnetic perpendicular phantom photograph pink placed plastic plot positioned practical press produce produced promising properties quadrature radiology radius refinements relatively requirement resonant resonator resonators rotated sample sealed setup simple simulated simulation simulations slice smaller static steady strengths strips surface suspensions system tissue transmission tubes tuning variable vector volume volunteer water whole wrist yellow