Bruno Pinho-Meneses1, Jason Stockmann2,3, Edouard Chazel1, Paul-François Gapais1, Eric Giacomini1, Franck Mauconduit1, Alexandre Vignaud1, Michel Luong4, and Alexis Amadon1
1Université Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, Gif-sur-Yvette, France, 2Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 3Harvard Medical School, Boston, MA, United States, 4Université Paris-Saclay, CEA, Institut de Recherche sur les Lois Fondamentales de l'Univers, Gif-sur-Yvette, France
1Université Paris-Saclay, CEA, CNRS, BAOBAB, NeuroSpin, Gif-sur-Yvette, France, 2Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 3Harvard Medical School, Boston, MA, United States, 4Université Paris-Saclay, CEA, Institut de Recherche sur les Lois Fondamentales de l'Univers, Gif-sur-Yvette, France
A 2-layer 36-channel optimized Multi-Coil Array for B0 shimming of the human brain was designed. A prototype was built and in-vivo GRE and EPI acquisitions were performed, confirming high inhomogeneity reduction and artifact mitigation after shimming with the optimized MCA.
Figure 1: a) From left to right: Ideal
channel disposition and geometry for first and second layers, both layers resulting from the
SVD-based MCA optimization; and ideal 2-layer 36-channel system. b) The two
prototype layers and the assembled shimming system with RF housing in the
interior of the shim layers. c) Simulation models of generic 24-ch (left) and 48-ch (right) M-MCA used for comparison. Circular coil radii are 4.5-cm and 3.5-cm,
respectively.
Figure 5: a) Brain mask overlay (green)
considered for optimal current calculations for global shimming and selected
slices (blue) presented in b) rs-EPI acquisitions. Baseline, global and
slicewise (dynamic) 2-layer 36-channel SCOTCH shimming are shown. Gradient Echo rS-EPI sequence
parameters were 2-mm in-plane resolution, fifteen 3-mm-thick slices,
TE/TR=44/84000ms. Yellow arrows highlighting zones with significant
improvement.
