title: [Contrast agents in magnetic resonance imaging].
abstract: The origin of nuclear magnetic resonance signal is reminded in this paper. Different ways of increasing the contrast in magnetic resonance imaging are presented, especially modifications of tissues relaxation times by the use of paramagnetic ions or nitroxides. The potential of these substances is illustrated by several examples of application in the animal.
mesh_terms: D000818:Animals; D003287:Contrast Media; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D009589:Nitrogen Oxides; D013113:Spin Labels
chemical_list: D003287:Contrast Media; D009589:Nitrogen Oxides; D013113:Spin Labels
vernacular_title: Les agents de contraste en imagerie par résonance magnétique.