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Abstract #4223

Analysis of B0 Field Shimming Limitations in the Human Brain at Ultra-High-Field

Bruno Pinho Meneses1,2 and Alexis Amadon1
1Neurospin/CEA-Saclay, Gif-sur-Yvette, France, 2Université Paris-Saclay, Saclay, France

Design of optimized shimming equipment is under way for UHF MRI of the human brain. Here shimming theoretical limits are explored. With a simple model, proof is given that, depending on field source distribution around a zone of interest, no shimming hardware external to such a zone can fully mitigate the inhomogeneous field. A simulation is performed on a 100-subject database to establish hard shim limits on the whole brain. On the other hand, 3D region-specific shimming is shown to be a very effective way to improve homogeneity in critical zones such as the pre-frontal cortex and around ear canals.

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