Inversion recovery
= Inversion recovery
{title2=$M_z(t)=M_0(1-2e^{-t/T_1})$}
An ideal resonant inversion pulse reverses the longitudinal magnetization. Subsequent <spin-lattice relaxation> gives the displayed recovery law. Observation at a chosen inversion time provides contrast or nulling for a specified relaxation time; an RF inversion alone does not amplify the initial polarization magnitude.