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• 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
T1 relaxation
transitions
• Longitudinal relaxation, Spin lattice relaxation,
T1 relaxation
• Rate of relaxation: R1=1/T1
Varies between tissues