Abstract #1450
Homogeneous neuroimaging at 7 tesla with short tailored radiofrequency pulses using high permittivity dielectric bags
Joep Wezel 1 , Maarten Versluis 1 , Andrew Webb 1 , Matthias van Osch 1 , and Peter Brnert 1,2
1
C.J. Gorter center for high field MRI,
Radiology, Leiden University Medical Center, Leiden,
Netherlands,
2
Philips
Research Europe, Hamburg, Germany
Neuroimaging at 7 tesla is complicated by the high
degree of B1-inhomogeneity within the brain. Spezialized
RF pulses that take the B1 distribution into account can
compensate for the inhomogeneous field. These pulses are
generally longer than the regular pulses, leading to
increased sensitivity to B0 deviations. To counter this
trend we apply high permittivity dielectric pads that
reduce the severity of the flip angle voids. This
potentially leads to the design of shorter RF pulses to
compensate for the remainder of the inhomogeneities. We
have simulated three pulse lengths with and without the
bags and verified this in-vivo.
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