High-Speed RF Modulation System for 32 Parallel Transmission Channels at 7T
Samaneh Shooshtary 1 , Marcel Gratz 2 , Mark E. Ladd 2,3 , and Klaus Solbach 1
High Frequency Technology, Duisburg-Essen
University, Duisburg, Germany,
L. Hahn Institute for Magnetic Resonance Imaging, Essen,
Physics in Radiology, German Cancer Research Center (DKFZ),
High-field 7T MR systems increasingly apply multichannel
transmit systems to overcome artifacts resulting from
comparably short wavelengths inside the human tissue.
Individual phase and amplitude modulation for each
channel is required to gain the desired image
homogeneity. A high-speed digitally controlled modulator
system is presented for independent phase and magnitude
control of 32 transmit channels in a 7T MR-scanner, thus
allowing RF shimming and dynamic trajectories as well as
TX Sense. Experimental results show stability and
reproducibility of the RF signal while calibration of
imperfect amplitude- and phase tracking of I- and Q
components for 32 individual channels is demonstrated.
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