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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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