Abstract #0752

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

Bei Zhang^1,2, Gregor Adriany³, Andrea Grant³, Russell Lagore³, Brian Rutt⁴, Kamil Ugurbil³, and Riccardo Lattanzi^1,5

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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