1. A method of regularization of x-ray phase contrast imaging (XPCi) system measurement data, the method comprising: obtaining air scan data of the XPCi system prior to the presence of an object undergoing imaging; performing Fourier analysis of the air scan data; computing air coefficients from the result of the performing step; obtaining object scan data of an object undergoing imaging on the XPCi system; regularizing the object scan data; and calculating at least one of absorption image data, differential phase image data, and dark field image data by using object coefficients.