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NUCLEAR MAGNETIC RESONANCEMagnetic Resonance ImagingNMR SpectroscopyPulse SequenceMagnetic ResonanceSpin SystemRadiation DampingNuclear Overhauser EffectChemical ShiftNMR RelaxationProduct Operator FormalismBloch EquationsPulse ExperimentsGradient CoilsSelective ExcitationNMR ImagingSpin EchoesDensity MatrixRadio FrequencyProduct Operator