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Abstract #1471

Designs of shim coils with distributed currents for 3T human brain magnetic resonance imaging

Mustafa Kaan Çan1, Pei-Yan Li2, Jiazheng Zhou2,3,4, Pu-Yeh Wu2, Yi-Tien Li2, Risto Ilmoniemi1, and Fa-Hsuan Lin1,2,5

1Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland, 2Institute of Biomedical Engineering, National Taiwan University, Taipei City, Taiwan, 3High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Tübingen, Germany, 4Graduate Training Center of Neuroscience, IMPRS, University of Tübingen, Tübingen, Germany, 5Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada

We propose single-channel head shim coils with either a helmet or a cylinder geometry. Shim current paths were designed by the stream function method with a realistic target field from a group of human subjects (n = 31). A smoothness constraint was included to decrease shim coil complexity. Helmet and cylinder shim coils with shim current amplitudes 4.2 and 6.9 A improved the standard deviation of residual magnetic field by approximately 17%, respectively.

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