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Abstract #0752

Shielding Effects on Signal-to-Noise Ratio at Ultra-High Field MRI

Bei Zhang1,2, Gregor Adriany3, Andrea Grant3, Russell Lagore3, Brian Rutt4, Kamil Ugurbil3, and Riccardo Lattanzi1,5
1Center for Advanced Imaging Innovation and Research, New York University School of Medicine, New York, NY, United States, 2Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, United States, 3Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, 4Stanford University, Stanford, CA, United States, 5The Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY, United States

We evaluated the effect of a radio frequency shield on the signal-to-noise ratio (SNR) of a loop coil at various field strengths in simulation. At 7T, SNR constantly improves as the shield diameter increases. At higher field strengths, SNR is maximized when using an optimal shield diameter, which is inversely proportional to the frequency. We also show that central SNR for a 32-channel receive array could drop by a factor of two when using a non-optimal shield diameter at 10.5T. Inserting a transmit array between the receiver and an optimally-sized shield could considerably deteriorate SNR.

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