Energy Resolved X-Ray Ghost Imaging with Different Materials

Ghost imaging (GI) is an indirect imaging technique that appeared more than thirty years ago, and because it can be applied across all wavelengths, it is now attracting even greater interest. Because of technical difficulties, X-ray ghost imaging was only realized very lately. Here we demonstrate energy-resolved GI with an object composed of three materials, Mo, Ag and Sn. An X-ray beam emitted from a copper target is spatially modulated by a mask composed of a series of Hadamard matrices, and after passing through the object its intensity is recorded by an energy-resolved bucket detector. Correlating the Hadamard patterns with their corresponding spectral signals, we reconstruct the images over different energy ranges by two different algorithms. This experiment demonstrates the many potential applications of X-ray GI in noninvasive spectral imaging in material science, biology, medical diagnosis, and so forth.