in vivo method ex vivo method nuclear magnetic resonance spectroscopy 2020-05-22T10:48:21Z MMO:0000709 MRS NMR spectroscopy Nuclear Magnetic Resonance (NMR) spectroscopy is a technique to observe local magnetic fields around atomic nuclei. The sample is placed in a magnetic field and the NMR signal is produced by excitation of the nuclei sample with radio waves into nuclear magnetic resonance, which is detected with sensitive radio receivers. magnetic resonance spectroscopy measurement_method_ontology slaulede