Opencage radio frequency coil for magnetic resonance imaging

A. Nikulin, J. de Rosny, K. Haliot, B. Larrat and A. Ourir, Opencage radio frequency coil for magnetic resonance imaging, Appl. Phys. Lett. 114, 053503 (2019)

Involved Partners : CNRS ( Institut Langevin) and CEA ( Neurospin)

https://doi.org/10.1063/1.5082245

Abstract

We present a volume radio frequency coil for Magnetic Resonance Imaging that provides access to the region of interest. While the conventional birdcage coil is composed of a periodic array of similar unit cells making a cylindrical structure, the proposed coil, called “opencage,” is made of an aperiodic array of metamaterial based unit cells presenting different geometries and characteristics. We develop here a dedicated approach based on Bloch impedance matching and phase balance for the design of the opencage coil. We perform full-wave numerical simulations to validate this concept. An experimental demonstration of the opencage coil for small animal imaging at 7 Tesla is presented. The results of the in–vitro, in–vivo imaging and

B_{1}^{+}

map reconstruction achieved with a preclinical MRI scanner are presented. We show that $B_{1}^{+}$ field homogeneity and amplitude generated by the opencage coil are comparable to those of a conventional birdcage coil of the same size.

https://doi.org/10.1063/1.5082245

Abstract

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