# Translations:Phase-shift migration/3/en

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- Just as any other migration algorithm, start with the two-way scalar wave equation (
**12**). - Assume constant velocity and perform 3-D Fourier transform and obtain the dispersion relation between the transform variables (equation
**13a**). - Then, adapt the dispersion relation to the exploding reflectors model by halving the velocity for the upcoming waves (equation
**13b**). - Operate on the pressure wavefield
*P*and inverse transform in*z*to obtain the differential equation (**20**). - Obtain the solution given by equation (
**21**).