  We present a practical experimental realization of transmission x-ray ghost
imaging using synchrotron light. Hard x-rays from an undulator were split by a
Si 200 crystal in Laue geometry to produce two copies of a speckled incident
beam. Both speckle beams were simultaneously measured on a CCD camera. The
sample was inserted in one of the two beams, and the corresponding image was
integrated over the camera extent to synthesize a bucket signal. We show the
successful x-ray ghost image reconstruction of two samples and discuss
different reconstruction strategies. We also demonstrate a method for measuring
the point spread function of a ghost imaging system, which can be used to
quantify the resolution of the ghost imaging reconstructions and quantitatively
compare different reconstruction approaches. Our experimental results are
discussed in view of future practical applications of x-ray ghost imaging,
including a means for parallel ghost imaging.
