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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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