New low-order pre-fractal geometries of high permittivity pads further increase sensitivity at high magnetic fields

In previous work the concept of using high permittivity materials to increase the strength and homogeneity of the B1 field has been shown at 3T and 7T. However, it was also shown that at ultrahigh field instead of a monotonic sensitivity improvement, high permittivity pads can also be a source of local signal decreases due to wavelength effects within the material. In this study we investigate how the wavelength effects can be mitigated by using a low order prefractal geometry for the dielectric pad, which maintains the overall coverage of the pad, but gives an increase in sensitivity and homogeneity.

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