Figure 5.

Preparation pulses. a) Inversion recovery pulse. b) Saturation recovery pulse. Both figures a and b show the longitudinal magnetisation recovery after the preparation pulse for two different T1 values (T1 red < T1 blue). Please note that in both a and b diagrams the effects on the longitudinal magnetisation by the host sequence are not considered. c) SPAMM tagging preparation showing the spatial modulation of the available longitudinal magnetisation following two 45 degree pulses prior to the host sequence.