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Abstract #3933

Effect of head motion on B0 shimming based on magnetic field probes

Joep Wezel1, Andrew G. Webb1, and Matthias J. van Osch1

1Radiology, Leiden University Medical Center, Leiden, Netherlands

Magnetic field probes (FP) can be used to monitor B0-changes and this approach has shown great potential for real time correction of artifacts produced by such changes. When estimating B0 fluctuations in the brain it is, however, not known how head motion influences the FP-based B0-estimation. Head motion introduces a B0-change both inside and outside the head, this study assesses the impact on field probe estimated B0-distributions within the brain at 7 Tesla. FP based correction after head motion can actually lead to a higher error especially evident when using third order spherical harmonics. Improved performance is, however, identified when using first order spherical harmonics.

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