A series of rapid, equally spaced rf pulses of constant amplitude produces two distinct components of transverse magnetization. FADE (fast acquisition double echo) is a new Fourier steady-state free precession (SSFP) imaging sequence which images both components separately in each interpulse interval. The first component gives more signal than the second but lacks contrast while the second is strongly T2 weighted.
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Redpath et al. (1988) studied this question.
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