  The use of x-ray imaging in medicine and other research is well known.
Generally, the image quality is proportional to the total flux, but high photon
energy could severely damage the specimen, so how to decrease the radiation
dose while maintaining image quality is a fundamental problem. In "ghost"
imaging, an image is retrieved from a known patterned illumination field and
the total intensity transmitted through the object collected by a bucket
detector. Using a table-top x-ray source we have realized ghost imaging of
plane and natural objects with ultra-low radiation on the order of single
photons. Compared with conventional x-ray imaging, a higher contrast-to-noise
ratio is obtained for the same radiation dose. This new technique could greatly
reduce radiation damage of biological specimens.
