T1 depends on tissue composition, structure and surroundings. As we have read, T1-relaxation has something to do with the exchange of thermal energy, which is handed over from the protons to the surroundings, the lattice.
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T1 Relaxation Time
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T1 RelaxationLongitudinal RelaxationMRI SignalSignal localizationMagnetic Resonance imagingMagnetsmagnetResonanceClinical MRIMRI PhysicsPhysicsMagnetic MomentsMRIProtons Magnetic fieldNucleusHydrogenProtiumRF pulsesRadio frequenciesRadio wavesLarmorLarmor equationprecessionprecessional frequencycoordinate systemlongitudinallongitudinal magnetizationNMVnet magnetization vectorRelaxation Time