1. A method for use in imaging an object, wherein the object's refractive index is spatially distributed, wherein the method comprises: modifying the spatial distribution of the refractive index of the object; imaging the object using interferometry as the spatial distribution of the refractive index of the object is being modified to provide imaging data; processing the imaging data based in part on the modification to the spatial distribution of refractive index of the object; and constructing an image of the object based on the processed imaging data.