“…Soon, Cheng et al theoretically put forward a scheme for lensless Fourier-transform imaging with a classical correlated source, and discussed its application in x-ray diffraction [5]. Compared with the entangled source, ghost imaging with classical thermal light provided more potential applications, so the classical correlated imaging has been studied extensively in recent years, both experimentally and theor etically [5][6][7][8][9][10]. Very recently, two groups experimentally realized x-ray ghost imaging [11,12], which may open the way for protocols to reduce radiation damage in medical imaging.…”