Phase Contrast Imaging with Coded Apertures Using Laboratory-Based X-ray Sources

Journal Article · Fri Sep 09 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3625352· OSTI ID:21608290

Ignatyev, K; Munro, P R. T.; Speller, R D; Olivo, A ^[1]

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1. Department of Medical Physics and Bioengineering, University College London, London (United Kingdom)

X-ray phase contrast imaging is a powerful technique that allows detection of changes in the phase of x-ray wavefronts as they pass through a sample. As a result, details not visible in conventional x-ray absorption imaging can be detected. Until recently the majority of applications of phase contrast imaging were at synchrotron facilities due to the availability of their high flux and coherence; however, a number of techniques have appeared recently that allow phase contrast imaging to be performed using laboratory sources. Here we describe a phase contrast imaging technique, developed at University College London, that uses two coded apertures. The x-ray beam is shaped by the pre-sample aperture, and small deviations in the x-ray propagation direction are detected with the help of the detector aperture. In contrast with other methods, it has a much more relaxed requirement for the source size (it works with source sizes up to 100 {mu}m). A working prototype coded-aperture system has been built. An x-ray detector with directly deposited columnar CsI has been used to minimize signal spill-over into neighboring pixels. Phase contrast images obtained with the system have demonstrated its effectiveness for imaging low-absorption materials.

• OSTI ID: 21608290
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1365; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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43 PARTICLE ACCELERATORS
ABSORPTION
ANTENNAS
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BEAM OPTICS
BEAM TRANSPORT
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ELECTROMAGNETIC RADIATION
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