X-Ray Imaging with Phase Contrast

Details X-Ray Imaging with Phase Contrast X-Ray Imaging with Phase Contrast

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1236..189b&link_type=abstract

INTERNATIONAL CONFERENCE ON ADVANCED PHASE MEASUREMENT METHODS IN OPTICS AND IMAGING. AIP Conference Proceedings, Volume 1236,

Physics

Optics

X-Ray Imaging, Light Coherence, Interferometry, Charge-Coupled Devices, X-Ray Scattering, X-Ray Beams And X-Ray Optics, Coherence, Phase Shifting Interferometry, Optical Elements, Devices, And Systems, Diffraction And Scattering

Scientific paper

The easiest way to obtain X-ray images of the internal structure of condensed objects is to register projections on an area detector like a photographic plate or a CCD and analyze the intensity of the transmitted beam. In such an arrangement the main cause of structures seen on the image is usually absorption contrast which scales with Z(Z/E)m where Z is atomic number, E is X-ray energy, and m ~ 2.5 to 3.5. Hence for light elements (which often are of main importance in the medical field) absorption contrast is quite small and sometimes unspecific compared to contrast caused by X-ray phase shift which scales with Z/E. In recent years various methods capable of registering X-ray phase shift have been developed, which include double crystal topography, X-ray interferometry, in-line phase-contrast imaging, the use of Talbot-mode grid devices, and others. A survey of existing approaches and examples of recent results will be given. -An important aspect in the application of X-ray imaging in the medical field is the amount of unavoidable irradiation dose to be applied to the patient under investigation. There is some hope that in the future, with a suitable phase-contrast method, the dose can be lowered.

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