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Abstract #1509

The Intrinsic Magnetic Field Symmetries of the Spiral Birdcage Coil

Christopher P. Bidinosti1, Chen-Yi Liu1, Scott B. King2

1Physics, University of Winnipeg, Winnipeg, Manitoba, Canada; 2Institute for Biodiagnostics, National Research Council of Canada, Winnipeg, Manitoba, Canada

Spiral birdcage coils have been used for transmit array spatial encoding (TRASE) as well as for partially correcting central image brightening. A Fourier transform method usually employed for designing wire-wound shim, gradient and low frequency RF coils is used here to analyze the magnetic field symmetries of the spiral birdcage coil. Results show that twisting leads to a strong, intrinsic radial dependence in all magnetic field components. This knowledge will guide the optimization of coils used for TRASE, and may also lead to a more direct correction scheme for the problem of central brightening that occurs in high field MRI.