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Proceedings Paper

Evaluation of two phase contrast techniques: diffraction-enhanced imaging and propagation
Author(s): Stefan Fiedler; Elodie Pagot; Peter Cloetens; Alberto Bravin; José Baruchel; Jürgen Härtwig; Paola Coan; Bruno Salicru; William C. Thomlinson
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Paper Abstract

Two X-ray phase-contrast imaging techniques are compared in a quantitative way for future mammographic applications: Diffraction Enhanced Imaging (DEI) and Propagation. The first uses an analyzer crystal after the sample acting as an angular filter for X-rays refracted by the sample. The latter simply uses the propagation (Fresnel diffraction) of the monochromatic and partially coherent X-ray beam over large distances. Experiments to compare both modalities have been performed at the Topography Beamline of the European Synchrotron Radiation Facility. The respective set-ups and experimental parameters are described in detail. Depending on the object properties, the two techniques present a difference in area contrast and edge visibility. DEI shows an enhancement of area contrast for positions of the crystal corresponding to the tails of its rocking curve (RC) and a similar increase but inverted is also visible at the peak of its RC. At the tails, the contrast is mainly produced by ultra small angle scattering, at the peak, it is due to absorption and scatter rejection by the analyzer. At the flanks, it may disappear when attenuation and scattering effects compensate each other. However, an enhancement of the object edges is clearly noticeable, which mainly corresponds to the refracted part. Propagation reveals an improvement of the edge visibility with the distance and shows negligible area contrast for non-absorbing, large structures.

Paper Details

Date Published: 5 June 2003
PDF: 8 pages
Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); doi: 10.1117/12.480245
Show Author Affiliations
Stefan Fiedler, European Synchrotron Radiation Facility (France)
Elodie Pagot, European Synchrotron Radiation Facility (France)
Peter Cloetens, European Synchrotron Radiation Facility (France)
Alberto Bravin, European Synchrotron Radiation Facility (France)
José Baruchel, European Synchrotron Radiation Facility (France)
Jürgen Härtwig, European Synchrotron Radiation Facility (France)
Paola Coan, European Synchrotron Radiation Facility (France)
Bruno Salicru, Clinique du Mail (France)
William C. Thomlinson, European Synchrotron Radiation Facility (France)

Published in SPIE Proceedings Vol. 5030:
Medical Imaging 2003: Physics of Medical Imaging
Martin J. Yaffe; Larry E. Antonuk, Editor(s)

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