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Abstract #1391

Mapping and correcting respiration-induced field changes in the brain using fluorine field probes

Mads Andersen 1,2 , Kristoffer Madsen 1 , Lars Hanson 1,2 , Vincent Boer 3 , Tijl van der Velden 3 , Dennis Klomp 3 , Joep Wezel 4 , Matthias van Osch 4 , and Maarten Versluis 4

1 Danish Research Centre for Magnetic Resonance, Copenhagen University Hospital Hvidovre, Copenhagen, 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

Breathing induced dynamic B0 field perturbations in the head degrade image and spectral quality. It has recently been proposed to continuously stabilize the magnetic field by real-time updating of the shim fields, based on synchronous field measurements with external probes. A thorough analysis of how accurate such field measurements outside the head can reflect the spatially varying dynamic fields inside the head is currently lacking. We present such an analysis and see that 14 external field probes reflect the field in the head sufficiently well so it can be significantly stabilized.

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