Phase-contrast imaging of weakly absorbing materials using hard X-rays

@article{Davis1995PhasecontrastIO,
  title={Phase-contrast imaging of weakly absorbing materials using hard X-rays},
  author={Timothy J. Davis and Da Chao Gao and Timur E Gureyev and Andrew W. Stevenson and Stephen W. Wilkins},
  journal={Nature},
  year={1995},
  volume={373},
  pages={595-598}
}
IMAGING with hard X-rays is an important diagnostic tool in medicine, biology and materials science. Contact radiography and tomography using hard X-rays provide information on internal structures that cannot be obtained using other non-destructive methods. The image contrast results from variations in the X-ray absorption arising from density differences and variations in composition and thickness of the object. But although X-rays penetrate deeply into carbon-based compounds, such as soft… 
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References

SHOWING 1-10 OF 13 REFERENCES
Bragg reflection x ray optics
After a brief summary of the properties of x rays and of materials in the x ray frequency range, the ray optics and microscopic wavefield optics of Bragg reflection in perfect crystals are reviewed.
X-ray Bragg reflexion from perfect crystals – dependence on geometrical factors with particular regard to the zero-level-of-interaction limit
  • S. Wilkins
  • Mathematics
    Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
  • 1978
The variation of X-ray Bragg reflexion properties of centro-symmetric perfect crystals (both absorbing and non-absorbing) with thickness and degree of asymmetry of the reflexion is explored
A unified treatment of small‐angle X‐ray scattering, X‐ray refraction and absorption using the Rytov approximation
The Helmholtz wave equation for X-rays in a dielectric medium is solved using the Rytov approximation for the X-ray phase perturbation. It is shown that under appropriate limits the solution yields
Pendellösung Fringes of X-Rays in Bragg Case
The dynamical theory of electron and X-rays for a deformed crystal reported by Takagi is applied to the Bragg case. The transmitted and diffracted waves are represented by the same integral forms as
Use of Asymmetric Dynamical Diffraction of X-rays for Multiple-Crystal Arrangements of the (n1, +n2)Setting
Asymmetric dynamical diffractions of X-rays are successively used for multiple crystals arranged in the (n1 , +n2) setting. Double successive asymetric diffractions of the (n1 , +n2) arrangement give
Application de la théorie dynamique de S. Tagaki au contraste d'un défaut plan en topographie par rayons X. I. Faute d'empilement
Tagaki's dynamical theory of X-ray diffraction by a perfect crystal is described for the two cases of an incident plane-wave and a spherical wave. Emphasis is put on the relation between these two
X-Ray diffraction
This t'e_r_t was prepared as an account of work sponsored by an agency of the United States : Government. Neither the United States Government nor any agency th,_reof, nor any of their *i empl.oyees
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