Abstract #0399
A 3-Port Traveling-Wave Antenna in Combination with TIAMO for the Acquisition of Void-Free Brain Images at 9.4 Tesla
Jens Hoffmann 1,2 , Christian Mirkes 1,3 , G. Shajan 1 , Klaus Scheffler 1,3 , and Rolf Pohmann 1
1
High-Field Magnetic Resonance Center, Max
Planck Institute for Biological Cybernetics, Tuebingen,
BW, Germany,
2
Graduate
School of Neural & Behavioural Sciences, Tuebingen, BW,
Germany,
3
Department
for Biomedical Magnetic Resonance, University of
Tuebingen, Tuebingen, BW, Germany
Three waveguide modes propagate in a 9.4 T whole-body
scanner compared to only two modes at 7 T. While three
modes are still insufficient to homogenize the B1 field
across larger volumes, a time-interleaved acquisition of
two complementary RF shims (TIAMO) and the subsequent
sum-of-squares reconstruction of the single images is
suitable to achieve whole-brain coverage without signal
dropouts. Using simulations, we show that excitation
inhomogeneity (max-to-min ratio) can be reduced by a
factor of 2 (4) compared to CP mode. Finally, void-free
whole-brain traveling-wave MRI at 9.4 T is demonstrated
in vivo using a compact, adjustable 3-port antenna.
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