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Free keywords:
MRI; Safety; Human models
Abstract:
We investigated how cerebrospinal fluid (CSF)
simulated as a single electrically connected object and variation
of the geometry of an anatomical human head model influence
the transmit and safety excitation efficiencies of a 7T magnetic
resonance imaging transmit array. A dual-row array was excited
in circularly polarized (CP) and radiofrequency (RF) shimming
modes. In both excitation modes, CSF partially shielded the brain
from the array RF field. It resulted in decreases of both transmit
and safety excitation efficiencies. A smaller head size resulted in
larger transmit and safety excitation efficiencies for the CP
excitation mode.