Dumez, J.-N., et al., Long-lived localization in magnetic resonance imaging. J. Magn. Reson., 2014. 246(0): p. 27-30.
http://dx.doi.org/10.1016/j.jmr.2014.06.008
The longitudinal nuclear relaxation time, T1, sets a stringent limit on the range of information that can be obtained from magnetic resonance imaging (MRI) experiments. Long-lived nuclear spin states provide a possibility to extend the timescale over which information can be encoded in magnetic resonance. We introduce a strategy to localize an ensemble of molecules for a significantly extended duration (∼30 times longer than T1 in this example), using a spatially selective conversion between magnetization and long-lived singlet order. An application to tagging and transport is proposed.