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Abstract #0544

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

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

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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