Fig. 2.
Pulse sequences. (A) Prepolarized CPMG 2D imaging sequence. (i) Prepolarizion pulse. (ii) Resulting longitudinal magnetization. (iii) B0 field that remains on throughout data acquisition; dashed pulse is the adiabatic sweep field Basf. (iv) CPMG pulse sequence. (v) Spin echoes. (vi) Frequency encoding gradient. (vii) Phase encoding gradients. (B) IR contrast presequence applied before the imaging sequence (A) to null out selected species. (viii) Prepolarization pulse followed by IR polarizing pulse. (ix) B0 field and adiabatic sweep fields. (x) 180° inverting pulse. (xi) Longitudinal magnetization.