Magnetic resonance imaging signal enhancement via nuclear polarization (null)

Magnetic resonance imaging signal enhancement via nuclear polarization refers to techniques, especially dynamic nuclear polarization (DNP), that dramatically increase the sensitivity of MRI and NMR measurements by artificially boosting the polarization of nuclear spins. In DNP, microwave irradiation transfers polarization from highly polarized electron spins to nearby nuclear spins in a sample, often resulting in signal gains hundreds-fold higher than conventional thermal equilibrium methods. Hyperpolarization methods, including DNP and related techniques (e.g., para-hydrogen induced polarization, CIDNP), are especially important for detecting low-abundance nuclei and for imaging minute molecular changes in disease processes. This methodological process is not a specific molecule, receptor, enzyme, nor a classic therapeutic target, but rather a physical-chemical approach used to enhance imaging and analytical sensitivity in magnetic resonance-based modalities.

Other names

Dynamic nuclear polarization (DNP)Nuclear polarizationHyperpolarization techniquesSignal enhancement via polarization transfer

Enhancement of nuclear magnetic resonance signal through the transfer of polarization from electrons to nuclei (most commonly by DNP mechanisms: Overhauser effect, solid effect, cross effect, thermal mixing)