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Abstract #3195

An 8-Channel Parallel Transmit System For 7T MRI Based On Custom-Built I/Q Modulators

Sren Johst 1 , Marcel Gratz 1,2 , Samaneh Shoostary 3 , Klaus Solbach 3 , Mark E. Ladd 1,4 , and Stephan Orzada 1

1 Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany, 2 High-field and Hybrid MR Imaging, University Hospital Essen, University Duisburg-Essen, Essen, Germany, 3 High Frequency Technology, University Duisburg-Essen, Duisburg, Germany, 4 Medical Physics in Radiology, German Cancer Research Center (dkfz), Heidelberg, Germany

In this work we present an add-on parallel transmit (pTx) system based on a Siemens 1-channel 7T MRI system using custom-built I/Q modulators and the 8 standard power amplifiers of the MR system. The single exciter channel is split into subchannels, 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. An artifact originating from the modulators amplitude offsets could be corrected by applying a variable dynamic range pTx pulse. With this modification, the gradients and modulators could be synchronized successfully.

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