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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