28 PSIF: The Backward-Running FISP

It is possible to collect only the spin echo component of the previously described balanced gradient echo. Interestingly, a backward-running FISP generates just the spin echo. The basic sequence loop is illustrated in Fig. 28.1, indicated between two vertical dashed lines. The excitation pulse (1) for a given acquisition cycle generates transverse magnetization, which is dephased with the gradient arrangement that follows, refocused by the subsequent RF excitation pulse (2), and read out as the spin echo signal (3). Because the timing is identical to a backward-running FISP, the acronym FISP has been reversed to form PSIF, which has been adopted for this sequence.

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