  We present a method for solving the nucleon-nucleon scattering equation
without the use of a partial wave expansion of the scattering amplitude. After
verifying the accuracy of the numerical solutions, we proceed to apply the
method to the in-medium scattering equation (the Bethe-Goldstone equation) in
three dimensions. A focal point is a study of Pauli blocking effects calculated
in the (angle-dependent) three-dimensional formalism as compared to the usual
spherical approximation. We discuss our results and their implications.
