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The principles of magnetic resonance imaging. (a) Protons align either parallel (majority) or antiparallel (minority) and precess under external magnetic field B0. (b) Upon the introduction of RF pulses, protons are excited, with relaxation occurring following removal of the RF pulses. Graphical representation of (c) T1 relaxation (eqn (1)) and (d) T2 relaxation (eqn (2)). (Reproduced with permission from 19. Copyright 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
