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- Series of RF pulses, gradients and intervening time periods
- Time period determines image weighting
- Sequence is needed to produce signals sufficient enough to form an image
- Changing TE and TR enables forming different types of contrast
- Spins are rephased using
- 180 degree RF pulse – conventional spin echo, fast or turbo spin echo, inversion recovery, STIR, FLAIR
- Gradient – coherent gradient echo, incoherent gradient echo, steady-state free precession, balanced gradient echo, EPI
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