- Once RF is applied, spins move to high energy states. Once RF is removed, they transfer this energy to the lattice, called the spin lattice energy transfer.
- Slowly the spins magnetic moments move from high energy to low energy state
- NMV recovers and realigns to external field. This relaxation is called T1 recovery.
- Refers to NMV decay in the transverse plane
- Caused due to spin-spin interactions and external field inhomogeneities