Hyperpolarization (physics)
Hyperpolarization is the nuclear spin polarization of a material far beyond thermal equilibrium conditions. It is commonly applied to gases such as 129Xe and 3He, where the polarization levels can be enhanced by a factor of 104-105 above thermal equilibrium levels. Hyperpolarized noble gases are typically used in magnetic resonance imaging (MRI) of the lungs.
Read more about Hyperpolarization (physics): Spin-Exchange Optical Pumping, Metastability Exchange Optical Pumping, Dynamic Nuclear Polarization