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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