Ghost imaging (GI) is a novel computational imaging technique where an image is generated from thousands of measurements split into two components:
(i) position sensitive knowledge of the incident probe/beam,
(ii) a scalar quantifying the degree of interaction of probe/beam with the object being imaged. GI first emerged in the domain of visible-light optics in 1995. The term arose from Einstein's description of quantum entanglement as ``spooky action at a distance'' since initial realisations of GI utilised pairs of entangled photons. Classical implementations of GI have since been developed using pairs of correlated, coherent wave-fields. Very recently GI been achieved with atoms, electrons, and x-rays. Due to the penetrating power of x-rays, this immediately opens up the possibilityof ghost-tomography. No research into this topic currently exists in the literature; our group has developed the theory of x-ray ghost-tomography and performed the first realisation of the concept at European synchrotron (ESRF). Ghost tomography has the potential to relax the constraints that dose rate and detector performance impose on image quality and resolution.
In the talk I will outline the concepts of ghost-imaging, describe the various realisations with x-rays that exist in literature, and present our work on ghost tomography. I will finish with an outlook on the potential benefits of this technique, the possible application areas, and what research remains to be done in the field.