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Abstract #1273

Time-multiplexed Excitation and Acquisition (TEA) with Rotating RF Coil Array (RRFCA)

Jin Jin1,2,3, Zhentao Zuo4,5, Mingyan Li2, Ewald Weber2, Aurelien Destruel2, Feng Liu2, Rong Xue4,5, and Stuart Crozier2
1Siemens Healthcare Pty Ltd, Brisbane, Australia, 2The University of Queensland, St Lucia, Australia, 3University of Southern California, Los Angeles, CA, United States, 4Institute of Biophysics, Chinese Academy of Sciences, Beijing, China, 5Sino-Danish College, University of Chinese Academy of Sciences, Beijing, China

RF shimming, by means of adjusting the relative amplitudes and phases of the independent transmit channels of a parallel transmit system, is widely used in ultra-high-field imaging to improve transmit homogeneity but has limited capabilities especially for large fields of view. This work designed and tested an 8-channel rotating transceiver array to provide more degrees-of-freedom for both transmission and reception. During transmission, the array achieved a uniform effective transmit magnetic field in a time-multiplexed fashion; during reception, the array provided more unique sensitivity profiles, facilitating higher image SNR. Parallel-imaging-like reconstruction was developed, assisted by a robust self-calibrated sensitivity estimation technique.

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