Antialiasing Filter for Migration

I develop an antialiasing filter for reverse-time migration (RTM). It is similar to the traditional antialiasing filter used for Kirchhoff migration in that it low-pass filters the migration operator so that the dominant wavelength in the operator $\lambda^{oper.}$ is greater than two times the trace sampling interval $\Delta x$ , except it is applied to both primary and multiple reflection events. Instead of applying this filter to the data in the traditional RTM operation, I apply the antialiasing filter to the generalized diffraction-stack migration operator. This gives the same migration image as computed by antialiased RTM.