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
Imaging Division, UMC Utrecht, Utrecht,
for Magnetic Resonance Research, Minneapolis, Minnesota,
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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