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Abstract #0461

Combined active and passive shimming of the temporal lobes using graphite-silicone earplugs and a multi-coil B0 shim array

Andrew Lithen1,2, Albert Tamashausky3, Berkin Bilgic1,4, Kawin Setsompop5, Bryan Kennedy1, Lilianne Mujica-Parodi1,2, Lawrence Wald1,4, Shahin Nasr1,4, and Jason Stockmann1,4
1A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 2Dept. of Biomedical Engineering, Stony Brook University, Stony Brook, NY, United States, 3Asbury Carbons, Asbury, NJ, United States, 4Harvard Medical School, Boston, MA, United States, 5Dept. of Electrical Engineering, Stanford University, Stanford, CA, United States

Neuroimaging of the human brain temporal lobes has long been impeded by severe B0 inhomogeneity arising from air-tissue susceptibility interfaces around the ear canals and temporal bone. Here, we propose localized passive shimming using graphite-embedded silicone ear plugs, which replace standard ear plugs used during MRI. We further synergistically combine the passive shims with active multi-coil B0 shimming to boost shim performance. Our results show improvements in B0 homogeneity as assessed using field maps and signal loss and distortion in gradient-echo EPI slices.

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