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Abstract #2664

Quadrature Head Coil for Brain Imaging at 6.5 mT

Neha KOONJOO1,2, Bryce Primavera1,3, Jason P Stockmann1,2, Thomas Witzel1,2, Lawrence L Wald1,2, and Matthew S Rosen1,2,3

1Department of Radiology, MGH/AA Martinos Center for Biomedical Imaging, Boston, MA, United States, 2Harvard Medical School, Boston, MA, United States, 3Department of Physics, Harvard University, Cambridge, MA, United States

Highly-resolved proton imaging is challenging in the millitesla regime. With the aim of enhancing our previous single-channel spiral head coil for operation at 276 kHz, a quadrature head coil was designed, comprised of 2 layers (inner and outer) producing orthogonal B1 fields. Images acquired with the new quadrature coil had the same signal magnitude when compared to the single-channel coil. However, the expected √2-factor signal enhancement in combined SNR was not fully realized due to a 30% higher noise floor observed in one quadrature. Improvements in gradient amplifier filtering will significantly improve the SNR.

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