An Analytical Solution to Investigate the Impact of an Insulating Layer with High Permittivity Materials in Magnetic Resonance Imaging Applications

In this work we present a new analytical framework to investigate how the presence of an insulating layer, such as the distance between a high-permittivity helmet and the body tissues can impact the field distribution in the region of interest, and the choice of the optimum permittivity to this purpose. The framework is based on a recent reformulation of the Mie scattering for a layered sphere and is validated with a numerical method based on the finite difference time domain.