Abstract #1423

Combining Loops and Dipoles to Increase the Signal-to-Noise Ratio in Human Brain MRI at 7T: How to Shorten a Dipole Antenna?

Thomas Dardano¹, Rolf Gruetter^1,2, and Daniel Wenz^2,3

¹Laboratory of Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland, ²CIBM Center for Biomedical Imaging, Lausanne, Switzerland, ³Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

Dipole antennas can be used in multi-channel loop/dipole arrays to boost the signal-to-noise ratio in MRI at 7T (f=300MHz). For this purpose, dipole antennas need to be physically shorter. In this work we conducted electromagnetic field simulations and phantom experiments at 7T to compare the performance of an inductively-shortened dipole antenna with a dielectrically-shortened dipole antenna in a loop/dipole combination. We evaluated the performance of both designs in different loading conditions and we found that the dielectrically-shortened dipole antenna performed in a very robust manner providing apparent receive field gains when compared with its inductively-shortened counterpart.

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