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Abstract #1015

Placement of field probes for stabilization of breathing-induced B0-fluctuations in the brain

Mads Andersen 1,2 , Kristoffer H. Madsen 1 , Lars G. Hanson 1,2 , Vincent Boer 3 , Tijl van der Velden 3 , Dennis Klomp 3 , Joep Wezel 4 , Matthias J. van Osch 4 , Andrew G. Webb 4 , and Maarten J. Versluis 4,5

1 Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital, Hvidovre, Denmark, 2 Biomedical Engineering Group, DTU Elektro, Technical University of Denmark, Kgs. Lyngby, Denmark, 3 Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 4 C.J. Gorter center, Department of Radiology, Leiden University Medical Center, Leiden, Netherlands, 5 Philips Healthcare, Best, Netherlands

B0-fluctuations induced by breathing and body motion lead to artifacts at 7T. A promising solution is to monitor the B0-fluctuations during the scan using external field probes, and update the shims in real-time. The probes must be placed carefully. Here, we provide a simulation of breathing-induced B0-fluctuations and use this simulated field to test different sets of probe positions. We also formulate two optimization problems to guide placement of the field probes. Based on the simulations we recommend two sets of positions and do not recommend full 3rd order shimming based on only 16 field probe measurements.

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