  Quasi-particle interference (QPI) measurements have provided a powerful tool
for determining the momentum dependence of the gap of unconventional
superconductors. Here we examine the possibility of using such measurements to
probe the frequency and momentum dependence of the electron self-energy. For
illustration, we calculate the QPI response function for a cuprate-like Fermi
surface with an electron self-energy from an RPA approximation. Then we try to
reextract the self-energy from the dispersion of the peaks in the QPI response
function using different approaches. We show that in principle it is possible
to extract the self-energy from the QPI response for certain nested momentum
directions. We discuss some of the limitations that one faces.
