Abstract #1782
Evaluating the SNR performance of using dielectric pads with multiple channel RF coils at 7T
Bei Zhang 1 , Zahi A. Fayad 1 , Junqian Xu 1 , Bernd Stoeckel 2 , and Priti Balchandani 1
1
Translational and Molecular Imaging
Institute, Icahn School of Medicine at Mount Sinai, New
York, New York, United States,
2
Siemens
Medical Solution, New York, New York, United States
Both simulations and experiments show that the tuning
and matching of RF coils changed when dielectric pads
were used. For a dense receive array, such as the Nova
Medical single channel transmit 32-channel receive 7T
head coil, these changes can affect the coupling between
the coil elements and therefore the effective
sum-of-squares (SOS) SNR. When calcium titanate
dielectric pads (r= 137.4)were placed in the 32-channel
head coil, increased coil coupling was apparent in the
noise coefficient matrix and the SOS SNR decreased by
30%.However, the optimal SNR slightly increased when
using the dielectric pads. Therefore, in order to
maximize the advantage of dielectric pads, they should
be integrated into coil design and fabrication.
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