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Abstract #2951

B1+ and SNR Optimization of High Field RF Coils Through Offsetting of Transmit and Receive Elements

Graham Wiggins1, Qi Duan1, Riccardo Lattanzi1, Daniel K. Sodickson1

1Radiology, Center for Biomedical Imaging, NYU School of Medicine, New York, NY, USA

In high field MR the B1+ transmit and B1- receive patterns of a surface coil no longer coincide, but twist in opposite directions. When such a coil is used in a transmit-receive mode this leads to a loss of efficiency. Through full wave electromagnetic simulation and experiment we investigate the benefits of using separate transmit and receive elements and offsetting them so that the B1+ and B1- fields curl towards each other. SNR benefits of up to 40% are obtained, and it is found that there is an optimal angular offset for a given depth in the sample.