1. A method for identifying an object in image data generated by an examination using radiation, comprising: identifying, within three-dimensional image data, a region of interest (ROI) of the three-dimensional image data comprising a possible granular object based upon one or more morphological characteristics of the possible granular object; generating a set of one or more two-dimensional image slices of the region of interest from the three-dimensional image data; transforming the set of one or more two-dimensional image slices from an image domain to a spectral domain; generating one-dimensional spectral signature from the set of one or more two-dimensional image slices transformed into the spectral domain; and verifying, using the one-dimensional spectral signature, that the possible granular object is a granular object of the method implemented at least in part via a processing unit; wherein the one or more morphological characteristics correspond to an Eigen-box fill ratio (EBFR).