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Abstract #4087

Dielectrically-Shortened Dipole Antennas for MRI at 7.0 T: Thick or Thin?

Daniel Wenz1 and Rolf Gruetter1,2,3,4
1Center for Biomedical Imaging - Animal Imaging and Technology (CIBM-AIT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, 2Laboratory of Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland, 3Department of Radiology, University of Lausanne, Lausanne, Switzerland, 4Department of Radiology, University of Geneva, Geneva, Switzerland

Shortening dipole antennas using dielectric materials provides an opportunity to design very high-channel count dipole arrays which should boost signal-to-noise ratio and enable higher acceleration factors in parallel MRI at 7.0 Tesla. In this study, we compare different dipole antennas shortened using D2O. We demonstrate, that the height of the dielectric block becomes a critical design parameter when there is no direct contact between the block and the sample and what we know about dielectric block design should be revisited. Our results indicate, that miniaturizing dipole antennas, and employing them in an 8-channel configuration, is feasible without significant performance decrease.

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