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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