Benjamin Emanuel Dietrich1, Christoph Barmet1, David Brunner1, Klaas Paul Pruessmann1
1Institute for Biomedical
Engineering, University & ETH
In current magnetic field monitoring systems acquisition duration is limited by the dephasing of the NMR field probes either by T2 decay, internal field variation or externally induced fields. Thus prohibiting field monitoring of scans with strong dephasing gradients (as applied in diffusion MRI) or long coherence trains (such as balanced SSFP). To alleviate these problems very short coherence times (T2,T1~ms) can be chosen. A new method based on short lived T/R-NMR probes enables real-time, continuous field monitoring. This is achieved by an interleaved excitation of sets of probes and rapid T/R switching.