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Abstract #4021

A Mono-surface 8Tx/16Rx Antisymmetric Dipole Antenna Array for Parallel Transmit Cardiac MRI in Pigs at 7T

Ibrahim A. Elabyad1, M. Terekhov1, and Laura M. Schreiber1
1Chair of Cellular and Molecular Imaging, Comprehensive Heart Failure Center (CHFC), University Hospital Wuerzburg, Wuerzburg, Germany

A mono-surface 8Tx/16Rx antisymmetric dipole antenna array was designed and tested for parallel transmit (pTx) cardiac magnetic resonance imaging (cMRI) in pigs at 7T. The antisymmetric array comprised of a mono-surface 16-dipoles arranged so that two central L-shaped dipoles were anti-symmetrically flanked by 7-dipoles on either side. Combined FA, SNR, and g-factor maps were acquired in phantom using the dipole antenna array and compared with an 8Tx/16Rx loop array. After $$$B_1^+$$$-shimming using the dipole array, the SNR was enhanced by ~20% and FA by ~42%. Dipole antenna array has demonstrated ~20-times improvement in RSD of the FA after $$$B_1^+$$$-shimming.

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