Transverse or spin-spin relaxation when spins begin to precess out of phase with each other is termed:

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When spins begin to precess out of phase with each other, it is called transverse relaxation or spin-spin relaxation. This process is represented by the time constant T2, which describes the rate at which the transverse magnetization decays. T1, on the other hand, refers to the rate at which longitudinal magnetization returns to equilibrium. Spin density and free induction decay are related to other concepts in MRI, but not specifically to transverse relaxation.

Transverse or Spin-Spin Relaxation When Spins Begin to Precess Out