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Abstract #3534

Control of Excited Modes in Ultra High Magnetic Field MRI with Electrically Hard Surfaces

Patrick Bluem1, Andrew Kiruluta2, Pierre-Francois Van de Moortele3, Gregor Adriany3, and Zoya Popovic1

1Department of Electrical, Computer, and Energy Engineering, University of Colorado at Boulder, Boulder, CO, United States, 2Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States, 3University of Minnesota, Center for Magnetic Resonance Research, Minneapolis, MN, United States

Traditional MRI reactive near-field probe design for B1 field uniformity assumes quasi-static fields. However, for B0>4T, the quasi-static approximation is no longer valid since the wavelength is smaller than the FOV and field wave modes appear, affecting image quality. This work presents the use of a copper strip waveguide structure combined with a traveling wave excitation at 7T, 10.5T human wide-bore and 16.4T small animal scanners, while observing the effect on a cylindrical distilled water phantom. A simple flexible copper strip wearable wrap is shown to improve SNR and field distribution in UHF-MRI.

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