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Abstract #3131

Short dipole array for enhanced B1 efficiency/sensitivity at the expense of SAR

Alexander J.E. Raaijmakers 1 , Arcan Erturk 2 , Greg Metzger 2 , Cornelis A.T. van den Berg 1 , and Gregor Adriany 2

1 Imaging Division, UMC Utrecht, Utrecht, Utrecht, Netherlands, 2 Center for Magnetic Resonance Research, Minneapolis, Minnesota, United States

We explored a dipole antenna design optimized for high B1 sensitivity/efficiency in the prostate while accepting increased SAR levels. Ten 20 cm dipole antennas have been constructed with T-shaped antenna legs. SAR levels were assessed by numerical simulations. This array was compared to an array of fractionated dipole antennas by SNR and B1+ measurements in the prostate and T2w TSE images. As expected, both B1 and SAR levels are higher for the short dipoles. The B1+/√SARmax ratio is 11.3% smaller and the SNR is 10% larger for the short dipole array. Image quality of the short dipoles is generally good.

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