X-ray phase imaging: Demonstration of extended conditions for homogeneous objects.

@article{Turner2004XrayPI,
  title={X-ray phase imaging: Demonstration of extended conditions for homogeneous objects.},
  author={Luke E Turner and Bipin B Dhal and John Hayes and Adrian Mancuso and K. Nugent and David Paterson and R. Scholten and Chanh Minh Tran and A. N. Peele},
  journal={Optics express},
  year={2004},
  volume={12 13},
  pages={2960-5}
}
We discuss contrast formation in a propagating x-ray beam. We consider the validity conditions for linear relations based on the transport-of-intensity equation (TIE) and on contrast transfer functions (CTFs). From a single diffracted image, we recover the thickness of a homogeneous object which has substantial absorption and a phase-shift of --0.37 radian. 

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