We investigate the performance that can be achieved by applying volume and slice shimming on the commonly-used Nova 8-channel transmit/32-channel receive head coil, whilst controlling the total transmit power, as a proxy for global SAR. Under this constraint, our results suggest that shimming on individual axial slices can significantly improve the achievable B1 field uniformity (39.0% ± 3.9%) for the same transmit power as normal quadrature mode.
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