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Abstract #3481

Local versus Global: Optimal Evolutionary Solvers for 3rd Order Spherical-Harmonics B0-shimming at 7T .

Maxim Terekhov1, Istvan Homolya1, Matthias Gamer2, and Grit Hein3
1Cardiovascular Imaging, Chair of Molecular and Cellular Imaging, University Hospital Würzburg, Comprehensive Heart Failure Center, Wuerzburg, Germany, Germany, 2Department of Psychology, Julius-Maximilians University Würzburg, Wuerzburg, Germany, 3Department of Psychiatry, University Hospital Würzburg, Wuerzburg, Germany

Synopsis

Keywords: Shims, Shims, 7T, numeric optimization, brain

Motivation: Optimal B0-shimming has critical importance for MRI at Ultra-High-Field providing essential gain of SNR and diminishing a variety of MR-images artefacts.

Goal(s): The aim was to compare the capabilities of local and global solvers to enable the most efficient numeric optimization providing homogeneous B0 in the targeted regions.

Approach: We performed a retrospective study using B0-maps of 37 subjects acquired at 7T-scanner with shims up to 3rd order.

Results: The global solvers based on the evolutionary algorithms provide better stability of optimization compared to local solver. The adequate choice of global solver for 3rd-order calibration-based B0-shimming may provide results superior the vendor-integrated procedures.

Impact: Global optimization solvers based on evolutionary algorithms may provide B0-shimming results essentially superior to the vendor-integrated solution on a 7T scanner with 3rd order shims.

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