Abstract #1393
Hybrid Digital Phase-Locked Loop and Moving Average Filtering Improves SNR in Spatio-Temporal Field Monitoring
Yu-Chun Chang 1,2 , Martin Eschelbach 1 , Klaus Scheffler 1 , and Anke Henning 1,3
1
Max Planck Institute of Biological
Cybernetics, Tuebingen, Baden-Wuerttemburg, Germany,
2
Graduate
School of Neural & Behavioural Sciences, University of
Tuebingen, Tuebingen, Baden-Wuerttemburg, Germany,
3
Institute
for Biomedical Engineering, University and ETH Zurich,
Switzerland
Recent spatio-temporal B0 field monitoring methods
utilise an array of NMR probes to measure the dynamics
of the B0 field. The B0 field is usually characterised
by spherical harmonic coefficients which are obtained
from the phase signals (or phase coefficients) of the
probe FIDs. A hybrid method is presented that uses a
moving average filter in conjunction with a digital
phase locked-loop filter to improve the SNR of the phase
signals measured by the NMR probes. This method takes
advantage of the FID SNR to reduce the phase jitter in
the phase signal. It is also easy to implement for
real-time applications.
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