Abstract #2391
Hybrids of Static and Dynamic RF Shimming for Body Imaging at 7T
Martina Flser 1,2 , Andreas Bitz 1 , Sren Jost 2 , Stephan Orzada 2 , Marcel Gratz 2 , Oliver Kraff 2 , and Mark Ladd 1,2
1
Medical Physics in Radiology, German Cancer
Research Center (DKFZ), Heidelberg, Germany,
2
Erwin
L. Hahn Institute for MRI, University Duisburg-Essen,
Essen, Germany
Dynamic RF shimming can mitigate B
1
+
inhomogeneities
that hamper body imaging at high field strength. A large
number of independent transmit channels offers more
degrees of freedom but makes the system complex and
expensive. Therefore, we propose to combine several
transmit elements to adaptive elements that are excited
by fully modulated Tx channels. The amplitude and phase
weightings within an adaptive element, but not the pulse
shape, are variable. We present a method to optimize the
amplitude and phase weightings and evaluate the
performance of the hybrid shimming strategy based on
simulated B1 maps.
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