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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