k-t-Calibration improves continuous field monitoring for image reconstruction
Benjamin E. Dietrich 1 , Bertram J. Wilm 1 , David O. Brunner 1 , Yolanda Duerst 1 , Christoph Barmet 1,2 , and Klaas P. Pruessmann 1
Institut for Biomedical Engineering,
University and ETH Zurich, Zurich, Zurich, Switzerland,
Magnetic Resonance Technologies, Zurich, Switzerland
By means of NMR probe based magnetic field monitoring,
the spatio-temporal magnetic field evolution and hence
k-space trajectory can be observed and used to improve
image reconstruction. Continuous field monitoring based
on time interleaved acquisition of sets of fast relaxing
probes enables sequence independent monitoring over
arbitrary durations without limitations on k-space
range, but suffered so far under accumulated errors in
the calculated trajectories due to violations of the
assumption that the probes behave like point sources.
The presented k-space and time domain calibration method
addresses these problems and enables continuous
monitoring for image reconstruction.
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