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4T, the quasi-static approximation is no longer valid since the wavelength is smaller than the FOV and field wave modes appear, affecting image quality.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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