51 / 1363
• Fluctuating magnetic fields from the molecular
environment may have Larmor frequency→
stimulated transitions may occur
• After an RF-pulse, the z-component of M
relaxes back to equilibrium via such stimulated
transitions
• Longitudinal relaxation, Spin lattice relaxation,
T1 relaxation
• Rate of relaxation: R1=1/T1
T1 relaxation
Varies between tissues