Figure 3:

Bloch simulations of the magnetization signal immediately prior to the refocusing echo train (Point C as annotated Figure 1). In the Alsop approach, significant net magnetization is left on M_x, which is problematic as it will be recalled during the echo train leading to signal instabilities. Conversely, the M_x signal is nearly non-existent due to the spoiler pulse while the MG portion of the signal was “hidden” on the longitudinal axis prior to re-excitation.