Initial Experience of 7T MRSI with 2-channel Multi-transmit
He Zhu 1 and John C. Gore 1
VUIIS, Vanderbilt University, Nashville, TN,
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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