Propagation of a the Fields from a Single Coil in a High-Permittivity Helmet for MRI Applications

Use of High-Permittivity Materials can improve both the Signal to Noise Ratio and the Transmit Efficiency in Magnetic Resonance Imaging systems. The physical mechanisms that contribute to such enhancements are still not fully explored. For a better understanding of these mechanisms, we compare the propagation of the electromagnetic fields when no High-Permittivity helmet is used, and when two different High-Permittivity helmets are used. The results show the helmet contributing to extend the fields far from the coil, therefore providing a more uniform distribution of the fields all around the head.