Focus-detector arrangement for generating projective or tomographic phase contrast recordings with X-ray optical gratings
A focus-detector arrangement of an X-ray apparatus is disclosed for generating projective or tomographic phase contrast recordings with a phase grating. According to at least one embodiment of the invention, in the gaps between its bars, the phase grating includes a filler material whose linear attenuation coefficient in the relevant energy range is greater than that of the bars. The height of the filler material in the gaps is dimensioned on the one hand so that the X-radiation with the energy used for measuring the phase shift generates a phase shift in the X-radiation such that, after the phase grating, the rays which pass through the bars are phase shifted by one half wavelength relative to the rays which pass through the gaps with the filler material. Further, the height of the filler material in the gaps on the other hand is dimensioned so that the attenuation of the X-radiation, at least in relation to the energy used for measuring the phase shift, is the same when passing through the bars and when passing through the filler material.
38268321
Application number US20070700154 20070131
Alternative title(s) : (de) Fokus-detektor-anordnung zur erzeugung von phasenkontrast-röntgenaufnahmen und verfahren hierzu (fr) Agencement d'une source et d'un détecteur pour l'imagerie à rayons x à contraste de phase et procédé associé (en) Source-detector arrangement for x-ray phase contrast imaging and method therefor
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