An Autonomous System for Continuous Field Monitoring with Interleaved Probe Sets

Benjamin Emanuel Dietrich¹, Christoph Barmet¹, David Brunner¹, Klaas Paul Pruessmann¹

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.