Improved reconstruction method for phase stepping data with stepping errors and dose fluctuations.

In conventional grating-based X-ray interferometry, it is necessary to repeatedly translate one of the gratings with high accuracy in regular submicron steps and to ensure a constant dose delivery during each step. However, stepping errors and dose fluctuations inevitably occur due to mechanical inaccuracies and/or thermal drift of the interferometer during the stepping process. As a result of these stepping errors and dose fluctuations, the standard reconstruction procedure without considering them causes artifacts in the images as stripes of specific frequencies.