Abstract #3067
Physiological and System-induced Field Fluctuations in EPI time series in vivo
Saskia Klein 1 , Lars Kasper 1 , S. Johanna Vannesjo 1 , Simon Gross 1 , Benjamin Dietrich 1 , Christoph Barmet 1,2 , Maximilian Haeberlin 1 , David O. Brunner 1 , Bertram J. Wilm 1 , and Klaas P. Prssmann 1
1
Institute for Biomedical Engineering,
University of Zurich and ETH Zurich, Zurich,
Switzerland,
2
Skope
Magnetic Resonance Technologies LLC, Zurich, Switzerland
We used concurrent magnetic field monitoring in-vivo to
measure system and physiological fluctuations in the
encoding fields of multiple EPI time series. Principal
component analysis disentangled these fluctuations based
on their frequency components in the projections.
Despite the robust detection of physiologically induced
field fluctuations, the observed SFNR losses are small
at 3T. However, correcting for system-induced
fluctuations in the encoding fields using concurrent
magnetic field monitoring increased the SFNR
considerably.
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