The conventional approach for x-ray radiography is absorption contrast. In recent years a new approach that eliminates the usual requirement for absorption and allows the visualization of phase based on refractive index features in a material has been demonstrated. This so-called “phase contrast imaging” has now been applied using a wide range of radiation and samples. In this work we are motivated by the need to find optimal conditions for achieving high quality phase contrast images. We consider image formation using the free space propagation of x-rays from a point source passing through a sample. This imaging model is a lens-less configuration and, as such, is very useful for x-ray wavelengths where lenses are difficult to fabricate. Although no lenses are used, image magnification is still achieved due to the expansion of the wavefront as it propagates from the point source illumination. The short wavelength and penetrating power of x-rays make them ideal for non-destructive studies of microscopic samples. However, these techniques are also important for investigating larger, non-microscopic samples.

Thesis (M.D.)--University of Adelaide, Dept. of Surgery, 1984. / Some mounted ill. Includes bibliographical references (leaves 147-194).

Thesis (Ph.D.)--University of Western Australia, 2003.

Thesis (Ph.D.)--University of Texas at Dallas, 2008. / Includes vita. Includes bibliographical references (leaves 150-158)

Thesis (Ph.D.)--University of Texas at Dallas, 2005. / Includes vita. Includes bibliographical references.

Thesis (Ph. D.)--University of Hong Kong, 2009. / Includes bibliographical references (leaves 89-116). Also available in print.

Thesis (Ph.D.)--University of Hong Kong, 2001. / Includes bibliographical references. Also available in print.

Issued also as author's dissertation. / Columbia contributions to philosophy and psychology, vol. XX, no. 2.

M. Phil. / Please refer to full text to view abstract / Prof. J.T. Ferreira

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