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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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