Abstract #4818
Effects of high-permittivity materials on absolute RF coil performance as a function of B 0 and object size
Riccardo Lattanzi 1,2 , Manushka V Vaidya 1,2 , Giuseppe Carluccio 1 , Daniel K Sodickson 1,2 , and Christopher M Collins 1,2
1
The Bernard and Irene Schwartz Center for
Biomedical Imaging, Department of Radiology, New York
University School of Medicine, New York, NY, United
States,
2
The
Sackler Institute of Graduate Biomedical Sciences, New
York University School of Medicine, New York, NY, United
States
Previous work has shown that transmit efficiency and
signal-to-noise ratio (SNR) can be improved by placing
pads of high-permittivity material (HPM) between the
radiofrequency coil and the sample. We employed dyadic
Greens functions for multi-layered spherical geometries
to calculate the ultimate intrinsic SNR and the SNR of a
32-element loop array surrounding uniform spheres with
different radii. Ultimate performance limits did not
change, but could be approached more closely by the
finite array with HPM added between the coil and the
object. For a head-sized sphere, the SNR advantage was
larger at 1.5T and 3T compared to higher B0 values.
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