longitudinal relaxation


lon·gi·tu·di·nal re·lax·a·tion

in nuclear magnetic resonance, the return of the magnetic dipoles of the hydrogen nuclei (magnetization vector) to equilibrium parallel to the magnetic field, after they have been flipped 90°; varies in rate in different tissues, taking up to 15 s for water. See: TI. Synonym(s): spin-lattice relaxation, spin-spin relaxation

longitudinal relaxation

An MRI term for the return of longitudinal magnetisation to equilibrium after excitation due to an exchange of energy between the nuclear spins and the lattice.

lon·gi·tu·di·nal re·lax·a·tion

(long'ji-tū'di-năl rē'lak-sā'shŭn) magnetic resonance imaging The return of the magnetic dipoles of the hydrogen nuclei (magnetization vector) to equilibrium parallel to the magnetic field, after they have been flipped 90°; varies in rate in different tissues, taking up to 15 seconds for water.
See: TI