Abstract #1471

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

Mustafa Kaan Çan¹, Pei-Yan Li², Jiazheng Zhou^2,3,4, Pu-Yeh Wu², Yi-Tien Li², Risto Ilmoniemi¹, and Fa-Hsuan Lin^1,2,5

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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