Abstract #0858
New low-order pre-fractal geometries of high permittivity pads further increase sensitivity at high magnetic fields
Rita Schmidt 1 and Andrew Webb 1
1
Radiology, Leiden University Medical Center,
Leiden, Netherlands
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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