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Abstract #0316

Array RF Transmitter for 7T MRI of the Spine Based on Dipole Antennas

Qi Duan 1 , Natalia Gudino 1 , Jacco A. de Zwart 1 , Peter van Gelderen 1 , Joe Murphy-Boesch 1 , Jeff H. Duyn 1 , and Hellmut Merkle 1

1 LFMI, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, United States

The feasibility of using electric dipole antennas for RF transmission for 7T spine MRI is explored. A transmitter consisting of two electric dipole antennas parallel to B 0 is evaluated. The capability of B 1 + field steering was demonstrated on a phantom. The transmit efficiency for the optimal setup was compared to a previously published design for a 7T spine array. The proposed transmit structure allows easy integration with a receive-only phased array. Because of design simplicity and favorable B 1 + efficiency, dipole antennas provide a promising alternative to conventional design for spine MRI at high field.

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