%0 journal article
%@ 1094-4087
%A Epple, F.M.,Potdevin, G.,Thibault, P.,Ehn, S.,Herzen, J.,Hipp, A.,Beckmann, F.,Pfeiffer, F.

%D 2013
%J Optics express
%N 24
%P 29101-29108 
%R doi:10.1364/OE.21.029101
%T Unwrapping differential x-ray phase-contrast images through phase estimation from multiple energy data
%U https://doi.org/10.1364/OE.21.029101
24 
%X We present a spectral phase unwrapping approach for grating-based differential phase-contrast data where the unwrapped interferometer phase shift is estimated from energy discriminated measurements using maximum likelihood principles. We demonstrate the method on tomographic data sets of a test specimen taken at different x-ray energies using synchrotron radiation. The proposed unwrapping technique was demonstrated to successfully correct the data set for phase wrapping.