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Abstract #4304

32-Channel In-Vivo Parallel Transmit Body Imaging at 7 Tesla

Sören Johst1, Sascha Brunheim1,2, Marcel Gratz1,2, Harald H Quick1,2, Mark E Ladd1,3, and Stephan Orzada1

1Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, 2High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany, 3Division of Medical Physics in Radiology (E020), German Cancer Research Center (DKFZ), Heidelberg, Germany

In this work we present phantom and in-vivo pTx excitation results acquired with a 32-channel add-on pTx system based on a 1-channel 7T MRI system. The add-on system uses custom-built I/Q modulators and custom-built amplifiers located inside the magnet room. The single exciter channel is split into 32 sub-channels, whereby the modulators control the phase and amplitude of the individual pTx RF pulses. The modulators and pre-calculated pTx gradients are synchronized via trigger signals generated in the imaging sequence. With the 32-channel pTx system, reduced FOV imaging of the lumbar vertebrae during free breathing was possible.

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