Reducing SAR and Imaging Time at 7T Using RF Multiplexing and Transceiver 
Arrays at 7T

Hetherington, HP; Avdievitch, N; Pan, J

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Reducing SAR and Imaging Time at 7T Using RF Multiplexing and Transceiver Arrays at 7T

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https://www.ismrm.org/13/tp10.htm
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Citation

Hetherington, H., Avdievitch, N., & Pan, J. (2013). Reducing SAR and Imaging Time at 7T Using RF Multiplexing and Transceiver Arrays at 7T. Poster presented at 21st Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2013), Salt Lake City, UT, USA.

Cite as: https://hdl.handle.net/21.11116/0000-0001-55A9-1

Abstract

At 7T, decreasing T2, T2* and increasing SAR and T1 can limit the number of slices acquired or acquisition time. RF multiplexing enables coil dense transceiver arrays (more coils than independent RF channels) to be used; which improves SNR (more optimal coil size and number) and B1 homogeneity and coverage. RF multiplexing inherently generates simultaneous multiple bands of excitation for slice selective pulses. The aliasing generated by the multiple bands of excitation can be removed by deconvolution with the receiver sensitivity matrix to regenerate three independent slices, thereby reducing SAR and increasing imaging speed by acquiring three slices per excitation.