T2-relaxation comes about when protons get out of phase, which as we already know - has two causes: inhomogeneities of the external magnetic field, and inhomogeneities of the local magnetic fields within the tissues.
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T2 Relaxation Time
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T2 RelaxationTransversalRelaxationMRI SignalSignal localizationMagnetic Resonance imagingMagnetsmagnetResonanceClinical MRIMRI PhysicsPhysicsMagnetic MomentsMRIProtons Magnetic fieldNucleusHydrogenProtiumRF pulsesRadio frequenciesRadio wavesLarmorLarmor equationprecessionprecessional frequencycoordinate systemlongitudinallongitudinal magnetizationNMVnet magnetization vectorRelaxation Time