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Abstract #2258

Improving the Flexibility of RF Power-Sharing Networks with High-Power Phase Shifters

Stephen E. Ogier1, Shaihan J. Malik1, and Joseph V. Hajnal1,2
1Biomedical Engineering Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, 2Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom

Synopsis

A typical parallel transmit system has an equal number of RF power amplifiers individually connected to an equal number of coil elements. When performing B1+ shimming, the maximum B1+ available is limited by single channel amplifier performance. RF networks which allow for power to be shared between transmit channels have been proposed as a way to overcome this limitation, but fixed networks only offer performance gains over limited ranges of relative phases between channels. Adding a high-power phase shifter between a power-sharing network and coil element can combat this, even with only a few bits of resolution.

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