2017_Imaging for Physicits

• The

transverse

component of the

magnetization also decays

• Local, microscopic field inhomogeneities

causes each spin to precess with a frequency

slightly different from

T2 relaxation

• An excitation pulse initially causes all spins to

precess in phase, but a dephasing then occurs

• transverse- or spin-spin relaxation; T2

• T2<T1