Fig. 2.

Illustration of the basic principles of slice selection and phase precompensation using 2D SPSP selective excitation. In an on-resonance brain region, slice selection is accomplished as indicated by the red dashed lines. In an off-resonance brain region, the slice volume is excited with through-plane phase values, as indicated by the blue dashed lines. If that phase variation matches the negative of that caused by dephasing, signal loss mitigation can be achieved.