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Abstract #3458

Enhancing B1+ at 7T MRI by combining a compact metamaterial devised from artificial dielectric with a TIAMO-like acquisition

Santosh K. Kumar Maurya1 and Rita Schmidt1
1Brain Sciences, Weizmann Institute of Science, Rehovot, Israel

Synopsis

Keywords: Non-Array RF Coils, Antennas & Waveguides, New Devices, metamaterial; artificial dielectric; B1 shimming

Motivation: Local signal enhancement at 7T MRI can benefit from passively added metamaterial while optimally combined with B1-shim configuration of the multi-channel transmit coils. Passively added metamaterial needs to be compact for easy integration in the tight coil-to-patient settings.

Goal(s): Our goal was to design a compact metamaterial and examine local signal enhancement with B1-shim configurations.

Approach: AD comprising of hexagonally placed conductive sub-units was designed and integrated in a resonant metamaterial at 298 MHz. Scans with TIAMO-like shimming were acquired.

Results: The TIAMO-like two scans configurations showed higher enhancement than using only CP-mode and the enhancement reached larger region-of-interest .

Impact: We demonstrated a new compact and thin AD and metamaterial configuration that does not require lumped elements for 7T MRI. Importantly, we showed that the use of B1-shim can further increase the achieved enhancement.

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