Definition: In magnetic resonance, the time for 63% of longitudinal relaxation to occur; the value is a function of magnetic field strength and the chemical environment of the hydrogen nucleus; for protons in fat and in water, in a 1.5T magnet, about 250 milliseconds and 3000 milliseconds, respectively. A T1-weighted image will have a bright fat signal.
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Examples: glitazone, GI cocktail, etc.