Abstract #4594

Impact of a High-Permittivity Helmet on Transmit Efficiency Across a Wide Range of Field Strengths and Relative Permittivities

Giuseppe Carluccio^1,2 and Christopher Michael Collins^1,2

¹Radiology, NYU Grossman School of Medicine, New York, NY, United States, ²Center for Advanced Imaging Innovation and Research (CAI2R), New York University, New York, NY, United States

Synopsis

Keywords: Non-Array RF Coils, Antennas & Waveguides, Non-Array RF Coils, Antennas & Waveguides, High-Permittivity MaterialsHigh-Permittivity Materials are used in MRI to manipulate the B1 field distribution for example to provide a stronger transmit efficiency. For a given coil, the transmit efficiency depends on the frequency. Here we examine the effects of a high-permittivity helmet on the transmit efficiency in exciting the brain with a birdcage coil over a range of frequencies. The optimal frequency providing the maximum transmit efficiency is not significantly impacted by the presence of the helmet, while the maximum efficiency can increase by about 100% compared to when no helmet is used.

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