2017 Imaging for Physicists Coursebook

• 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