Initial Experience of 7T MRSI with 2-channel Multi-transmit

Magnetic Resonance Spectroscopic Imaging (MRSI) should benefit from higher spectral resolution when translated from 3T to 7T. We recently developed a 7T MRSI method consisting of one pair of adiabatic full passage (AFP) pulses with dual band water and lipid suppression. However, earlier implementations suffered from B1 inhomogeneity effects associated with conventional quadrature RF transmission at 7T. Here, we report recently improved implementations of this MRSI method using 2-channel independent RF shimming. RF shimming with 2 independent channels based on B1-mapping achieved expected B1 compensation for 7T MRSI. This RF shimming approach may be implemented with more transmit channels to provide better MRSI measurements, but 2 channels improve performance over a single channel.

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